This document summarizes a study on the seismic vulnerability of flat plate column joints without slab shear reinforcement. A finite element model was developed and calibrated based on an experimental test. The model was then used to analyze flat plate column joints without slab shear reinforcement subjected to combined gravity and cyclic lateral loads. The results showed that joints without slab shear reinforcement are vulnerable to brittle punching shear failure and have low ductility. Inclusion of slab shear reinforcement can improve behavior in terms of ductility, energy dissipation, and resisting punching failure.
Pushover analysis of rc frame structure with floating column and soft story i...eSAT Journals
Abstract Open first story and Floating column are typical features in the modern multi-storey constructions in urban India. Such features are highly undesirable in buildings built in seismically active areas; this has been verified in numerous experiences of strong shaking during the past earthquakes like Bhuj 2001. In this study an attempt is made to reveal the effects of floating column & soft story in different earthquake zones by seismic analysis. For this purpose Push over analysis is adopted because this analysis will yield performance level of building for design capacity (displacement) carried out up to failure, it helps determination of collapse load and ductility capacity of the structure. To achieve this objective, three RC bare frame structures with G+4, G+9, G+15 stories respectively will be analysed and compared the base force and displacement of RC bare frame structure with G+4, G+9, G+15 stories in different earthquake zones like Rajkot, Jamnagar and Bhuj using SAP 2000 14 analysis package. Keywords: - floating column, soft story, pushover analysis, earthquake resistant structure
Comparison of bracings and shear walls as seismic strengthening methods to bu...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
A parametric study of x and v bracing industrial steel structureeSAT Journals
Abstract Severe earthquakes have an extremely low probability of occurrence during a structures life. If the earthquakes to be resisted by the structure elastically, it would require an expensive lateral load resisting system, which is not warranty. The structure may lose its aesthetic and functionality due to minor tremors and needs repairs; it will be a very unfavourable design. In addition to earthquake forces there may be wind or any vibrations which induce lateral loads in a structure. In our work we have taken only the earthquake load to find a system which balances the lateral loads and minimizes the displacements of the floors. With the literature review, it was founded that bracing in a structural system reduces the story drift and reduces the lateral force effect. To examine the performance of the bracings, bracing types like X and V bracings are considered and an analysis is performed in ETABS software. The results are studied, discussed and concluded for the best bracing system among both in our project. Keywords: Bracings, Time – History method
Behavior of plan irregularites using composite members by varying column spac...eSAT Journals
Abstract
Several studies proofs that the weaker columns has low seismic resistance, for this it is need to make the column stronger. The stronger columns can be obtained by many ways, here in this paper steel-concrete composite columns are considered. Use of composite columns in construction reduces the cross-section of the columns throughout the building and also increases the lateral-load resisting capacity to columns. The models consists of G+10, G+15, G+20 stories of Rectangular, L, T and plus shaped structures in which column spacing are varied as 3m, 4m, 5m and 6m along both directions in all structures. For all models the composite-column of size 450x450mm (ISMB 250) is kept constant, only the beam size has been varied accordingly while modeling a structure. The Response Spectrum analysis is done for all the buildings using ETABS version 15. Study is based on the performance of a multi-story building with plan irregularity under major earthquake forces by considering parameters like displacement, storey shear and drifts. Even though the cross section of the column considered is very small for tall buildings, the structure behaves stiff for severe seismic zone-V and also for different conditions; this is done by introducing steel-concrete composite column in a given building. Hence it is concluded that the use of composite columns in construction resists the lateral forces for many vulnerable conditions.
Keywords: Composite Column, Irregular Structure, Seismic Zone, Varying Height, Column Spacing.
Effect of concentric and eccentric type of bracings on performance based seis...eSAT Journals
Abstract When a tall building is subjected to lateral or torsional deflections under the action of seismicloads, the resulting oscillatory movement can induce a wide range of responses in the building’s occupants.[1]As a result, lateral stiffness is a major consideration in the design of tall buildings. Bracing is a highly efficient and economical method of resisting lateral forces in a frame structure. In this present study, the effect of four different types of bracing systems have been studied, for the use in SMRF RC framed building situated in seismic zone IV, in order to provide lateral stiffness and results in terms of storey shears and storey drifts have been presented. Keywords: RC Building, Concentric and Eccentric Bracings, Storey Drift,Storey Shear, Pushover Curves.
Effect of variation of plastic hinge length on the results of non linear anal...eSAT Journals
Abstract The nonlinear Static procedure also well known as pushover analysis is method where in monotonically increasing loads are applied to the structure till the structure is unable to resist any further load. It is a popular tool for seismic performance evaluation of existing and new structures. In literature lot of research has been carried out on conventional pushover analysis and after knowing deficiency efforts have been made to improve it. But actual test results to verify the analytically obtained pushover results are rarely available. It has been found that some amount of variation is always expected to exist in seismic demand prediction of pushover analysis. Initial study is carried out by considering user defined hinge properties and default hinge length. Attempt is being made to assess the variation of pushover analysis results by considering user defined hinge properties and various hinge length formulations available in literature and results compared with experimentally obtained results based on test carried out on a G+2 storied RCC framed structure. For the present study two geometric models viz bare frame and rigid frame model is considered and it is found that the results of pushover analysis are very sensitive to geometric model and hinge length adopted. Keywords: Pushover analysis, Base shear, Displacement, hinge length, moment curvature analysis
Pushover analysis of rc frame structure with floating column and soft story i...eSAT Journals
Abstract Open first story and Floating column are typical features in the modern multi-storey constructions in urban India. Such features are highly undesirable in buildings built in seismically active areas; this has been verified in numerous experiences of strong shaking during the past earthquakes like Bhuj 2001. In this study an attempt is made to reveal the effects of floating column & soft story in different earthquake zones by seismic analysis. For this purpose Push over analysis is adopted because this analysis will yield performance level of building for design capacity (displacement) carried out up to failure, it helps determination of collapse load and ductility capacity of the structure. To achieve this objective, three RC bare frame structures with G+4, G+9, G+15 stories respectively will be analysed and compared the base force and displacement of RC bare frame structure with G+4, G+9, G+15 stories in different earthquake zones like Rajkot, Jamnagar and Bhuj using SAP 2000 14 analysis package. Keywords: - floating column, soft story, pushover analysis, earthquake resistant structure
Comparison of bracings and shear walls as seismic strengthening methods to bu...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
A parametric study of x and v bracing industrial steel structureeSAT Journals
Abstract Severe earthquakes have an extremely low probability of occurrence during a structures life. If the earthquakes to be resisted by the structure elastically, it would require an expensive lateral load resisting system, which is not warranty. The structure may lose its aesthetic and functionality due to minor tremors and needs repairs; it will be a very unfavourable design. In addition to earthquake forces there may be wind or any vibrations which induce lateral loads in a structure. In our work we have taken only the earthquake load to find a system which balances the lateral loads and minimizes the displacements of the floors. With the literature review, it was founded that bracing in a structural system reduces the story drift and reduces the lateral force effect. To examine the performance of the bracings, bracing types like X and V bracings are considered and an analysis is performed in ETABS software. The results are studied, discussed and concluded for the best bracing system among both in our project. Keywords: Bracings, Time – History method
Behavior of plan irregularites using composite members by varying column spac...eSAT Journals
Abstract
Several studies proofs that the weaker columns has low seismic resistance, for this it is need to make the column stronger. The stronger columns can be obtained by many ways, here in this paper steel-concrete composite columns are considered. Use of composite columns in construction reduces the cross-section of the columns throughout the building and also increases the lateral-load resisting capacity to columns. The models consists of G+10, G+15, G+20 stories of Rectangular, L, T and plus shaped structures in which column spacing are varied as 3m, 4m, 5m and 6m along both directions in all structures. For all models the composite-column of size 450x450mm (ISMB 250) is kept constant, only the beam size has been varied accordingly while modeling a structure. The Response Spectrum analysis is done for all the buildings using ETABS version 15. Study is based on the performance of a multi-story building with plan irregularity under major earthquake forces by considering parameters like displacement, storey shear and drifts. Even though the cross section of the column considered is very small for tall buildings, the structure behaves stiff for severe seismic zone-V and also for different conditions; this is done by introducing steel-concrete composite column in a given building. Hence it is concluded that the use of composite columns in construction resists the lateral forces for many vulnerable conditions.
Keywords: Composite Column, Irregular Structure, Seismic Zone, Varying Height, Column Spacing.
Effect of concentric and eccentric type of bracings on performance based seis...eSAT Journals
Abstract When a tall building is subjected to lateral or torsional deflections under the action of seismicloads, the resulting oscillatory movement can induce a wide range of responses in the building’s occupants.[1]As a result, lateral stiffness is a major consideration in the design of tall buildings. Bracing is a highly efficient and economical method of resisting lateral forces in a frame structure. In this present study, the effect of four different types of bracing systems have been studied, for the use in SMRF RC framed building situated in seismic zone IV, in order to provide lateral stiffness and results in terms of storey shears and storey drifts have been presented. Keywords: RC Building, Concentric and Eccentric Bracings, Storey Drift,Storey Shear, Pushover Curves.
Effect of variation of plastic hinge length on the results of non linear anal...eSAT Journals
Abstract The nonlinear Static procedure also well known as pushover analysis is method where in monotonically increasing loads are applied to the structure till the structure is unable to resist any further load. It is a popular tool for seismic performance evaluation of existing and new structures. In literature lot of research has been carried out on conventional pushover analysis and after knowing deficiency efforts have been made to improve it. But actual test results to verify the analytically obtained pushover results are rarely available. It has been found that some amount of variation is always expected to exist in seismic demand prediction of pushover analysis. Initial study is carried out by considering user defined hinge properties and default hinge length. Attempt is being made to assess the variation of pushover analysis results by considering user defined hinge properties and various hinge length formulations available in literature and results compared with experimentally obtained results based on test carried out on a G+2 storied RCC framed structure. For the present study two geometric models viz bare frame and rigid frame model is considered and it is found that the results of pushover analysis are very sensitive to geometric model and hinge length adopted. Keywords: Pushover analysis, Base shear, Displacement, hinge length, moment curvature analysis
Effect of skew angle on uplift and deflection of rcc skew slabeSAT Journals
Abstract The study deals with the finite element modeling of simply supported skew slab with varying skew angles using ANSYS software. The behavior of the simply supported skew slab under point load applied at the centre depends on the ratio of short diagonal to its span. Skew slabs with ratio of short diagonal to span less than unity show lifting of acute corners whereas slabs with ratio of short diagonal to span greater than unity do not. Skew slab specimen with ratio of short diagonal to span less than unity is considered here for studying the effect of skew angle on the behavior of skew slab. The dimensions of skew slab were taken from available experimental data. In this paper skew angles varying from 0º to 30º were taken for the study. After the nonlinear finite element analysis of all skew slabs it is revealed that when skew angle increases the uplift at both the acute corners also increases. The result also suggests that the load carrying capacity increases with increase in skew angle. Keywords: Reinforced concrete, Finite element analysis, Skew slab, Uplift
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Seismic response of multi storey irregular building with floating columneSAT Journals
Abstract
In recent times, multi-storey buildings in urban cities are required to have column free space due to shortage of space, population and also for aesthetic and functional requirements. For this buildings are provided with floating columns at one or more storey. These floating columns are highly disadvantageous in a building built in seismically active areas. The earthquake forces that are developed at different floor levels in a building need to be carried down along the height to the ground by the shortest path. Deviation or discontinuity in this load transfer path results in poor performance of the building. In this paper, the critical position of floating column in vertically irregular buildings has been discussed for G+5 and G+7 RC buildings for zone II and zone V. Also the effect of size of beams and columns carrying the load of floating column has been assessed. The response of building such as storey drift, storey displacement and storey shear has been used to evaluate the results obtained using ETABS software.
Keywords: Floating column, Irregular building, Response spectrum method
Finite element analysis of jacketed reinforced concrete column subjected to a...eSAT Journals
Abstract One strategy for the jacketing of reinforced concrete column is to target the improvement of local vulnerabilities in columns related to inadequate strength (compressive & Flexural) or poor ductility. Theoretical analysis have been carried out in the present study for different column sections of jacket thickness of 75mm and 100mm for jacketed RC columns subjected to axial and uni-axial compressive loading. The uni-axial load carrying capacity along the major axes has been carried out under balanced section condition. Linear static finite element analysis has been carried out for the jacketed RC columns to compare the confined concrete strength (fcc) of finite element analysis with that of theoretical analysis, to plot the variation of stresses at the central core concrete and at the interface of old and new concrete. The maximum shear stress for the columns is also noted down. The displacement at core with respect to major axis is also plotted. Keywords: Axial load, Uni-axial load, NISA Display IV, Jacketing, confined compressive strength.
Seismic Performance of Reinforced Cement Concrete Structures with and Without...ijtsrd
Passive energy dissipation have been used so far to dissipate the unwanted energy due to earthquake and heavy wind actions. The complete failure of the structures that has occurred in the past due to catastrophic earthquakes may be avoided with the use of such devices. The study is concerned with the use of accordion metallic dampers that uses hysteretic energy to dissipate the unwanted energy due to earthquake. It consists of corrugated thin wall tubes installed as a brace connection in the frame. The axial deformation of the accordion damper enhances the lateral buckling capacity and results in maximum reduction of the damaging measures. The study emphasizes the use of such dampers and in depth analysis is performed by subjecting the building to base excitations in order to assess the nonlinear performance of the dampers installed in the building Rahul Tahilyani | Dilip Budhlani ""Seismic Performance of Reinforced Cement Concrete Structures with and Without Viscous Dampers"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-2 , February 2020,
URL: https://www.ijtsrd.com/papers/ijtsrd30122.pdf
Paper Url : https://www.ijtsrd.com/engineering/civil-engineering/30122/seismic-performance-of-reinforced-cement-concrete-structures-with-and-without-viscous-dampers/rahul-tahilyani
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Parametric study on slender column for flat plate structureeSAT Journals
Abstract This paper deals with effect of slender column on flat plate structure. The column is called slender if the height of is increased for functional purpose. The study is conducted on 18 flat-plate reinforced cement concrete (RCC) structural models. Among these18 models, 54 columns at three different locations (i.e. corner, edge and inner columns) are chosen for study. The models are developed using ETABS Software. Parametric study is performed by considering six different height of column ranging from 3048 mm to 6858 mm, using an increment of 762 mm along with three slab panels of size 4572 mm x 4572 mm, 6096 mm x6096 mm and 7620 mm x 7620 mm with five panels in both ways, considering both gravity and environmental load. The effect of slenderness ratio on load carrying capacity, design load and steel ratio is considered along with this the effect of additional moment due to slender compression member is also taken into account. It is observed that, columns in flat-plate structures are generally very sensitive if they are slender. It is observed that as the column length increases from 5502 mm and further, the steel ratio suddenly increases and it exceeds maximum allowed. As slenderness ratio increases, ratio of design load to the critical buckling load increases. Also resulting in increase of additional moment, decreasing load carrying capacity of column. This forces the design engineer to study effect of different parameter of the structure while designing high rise flat plate structure. Keywords: Flat Plate Structure, ETABS, Slenderness, Environmental load, design load and buckling load.
Behavioural studies of floating column on framed structureeSAT Journals
Abstract RCC concrete column means cement concrete reinforced with steel bars, steel plates, steel mesh etc. to increase the tension withstanding capacity of the structure. The term floating column means that the column is floated between two floors. Various types of structures G+3, G+5 and G+10 for RCC column and floating column are analyzed. The difference between G+3, G+5 and G+ 10 structures are shown by graphs and charts. Comparison will be done on bending moment and shear force between these structures. This paper presents the analysis of floating column and RCC column by using STAAD PRO V8i. Keywords: Floating Column, RCC column shear force and bending moment.
Design optimization of excavator bucket using Finite Element MethodIjripublishers Ijri
An excavator is a typical hydraulic heavy-duty human-operated machine used in general versatile construction operations,
such as digging, ground leveling, carrying loads, dumping loads and straight traction. Normally backhoe excavators
are working under worst working conditions. Due to severe working conditions, excavator parts are subjected to
high loads and must work reliably under unpredictable working conditions. Thus, it is necessary for the designers to
provide not only an equipment of maximum reliability but also of minimum weight and cost, keeping design safe under
all loading conditions.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Performance evaluation of a multi storey car parking structure under strength...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Evaluation of the use of concentric steel bracing to improve seismic performa...eSAT Journals
Abstract Most of the existing RC frame structures were not designed to withstand seismic effect. To meet those criteria structures should be retrofitted and out of all available retrofitting techniques adding steel braces are considered to be most efficient technique to enhance the seismic performance of the RC frame structure. In the present study three types of buildings are considered i.e., (G+2), (G+5), (G+8) as low rise, medium rise, high rise respectively, and these buildings are assigned by four different types of braces namely X, V, Inverted V, Eccen Forward at the periphery bays of the building in three different pattern i.e., model A, model B and model C. And these buildings are analyzed by nonlinear pushover analysis by using SAP2000.It is observed that the hinges were first formed in beams and followed by columns in bare frame whereas hinges were first formed in braces and followed by columns and followed by beams in case of X, Eccen forward brace and in case of V and inverted V hinges are formed first in brace followed by beams and followed by columns. It is pointed out that RC frames which are assigned with inverted V brace has least shear force and bending moment in the beams when compared to the other brace frames and there is less amount of variations in axial force shear force and bending moment in case of column. Keywords: equivalent static analysis, steel braces, equivalent strut method
Joint SCH-NCMS Technical Assessment on Earthquake-damaged Heritage Structures...nccaofficial
Technical assessment done by the NCCA Subcommission on Heritage - National Committee on Monuments and Sites on Earthquake-damaged Heritage Structures in Bohol and Cebu (May 27-31, 2014)
Effect of skew angle on uplift and deflection of rcc skew slabeSAT Journals
Abstract The study deals with the finite element modeling of simply supported skew slab with varying skew angles using ANSYS software. The behavior of the simply supported skew slab under point load applied at the centre depends on the ratio of short diagonal to its span. Skew slabs with ratio of short diagonal to span less than unity show lifting of acute corners whereas slabs with ratio of short diagonal to span greater than unity do not. Skew slab specimen with ratio of short diagonal to span less than unity is considered here for studying the effect of skew angle on the behavior of skew slab. The dimensions of skew slab were taken from available experimental data. In this paper skew angles varying from 0º to 30º were taken for the study. After the nonlinear finite element analysis of all skew slabs it is revealed that when skew angle increases the uplift at both the acute corners also increases. The result also suggests that the load carrying capacity increases with increase in skew angle. Keywords: Reinforced concrete, Finite element analysis, Skew slab, Uplift
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Seismic response of multi storey irregular building with floating columneSAT Journals
Abstract
In recent times, multi-storey buildings in urban cities are required to have column free space due to shortage of space, population and also for aesthetic and functional requirements. For this buildings are provided with floating columns at one or more storey. These floating columns are highly disadvantageous in a building built in seismically active areas. The earthquake forces that are developed at different floor levels in a building need to be carried down along the height to the ground by the shortest path. Deviation or discontinuity in this load transfer path results in poor performance of the building. In this paper, the critical position of floating column in vertically irregular buildings has been discussed for G+5 and G+7 RC buildings for zone II and zone V. Also the effect of size of beams and columns carrying the load of floating column has been assessed. The response of building such as storey drift, storey displacement and storey shear has been used to evaluate the results obtained using ETABS software.
Keywords: Floating column, Irregular building, Response spectrum method
Finite element analysis of jacketed reinforced concrete column subjected to a...eSAT Journals
Abstract One strategy for the jacketing of reinforced concrete column is to target the improvement of local vulnerabilities in columns related to inadequate strength (compressive & Flexural) or poor ductility. Theoretical analysis have been carried out in the present study for different column sections of jacket thickness of 75mm and 100mm for jacketed RC columns subjected to axial and uni-axial compressive loading. The uni-axial load carrying capacity along the major axes has been carried out under balanced section condition. Linear static finite element analysis has been carried out for the jacketed RC columns to compare the confined concrete strength (fcc) of finite element analysis with that of theoretical analysis, to plot the variation of stresses at the central core concrete and at the interface of old and new concrete. The maximum shear stress for the columns is also noted down. The displacement at core with respect to major axis is also plotted. Keywords: Axial load, Uni-axial load, NISA Display IV, Jacketing, confined compressive strength.
Seismic Performance of Reinforced Cement Concrete Structures with and Without...ijtsrd
Passive energy dissipation have been used so far to dissipate the unwanted energy due to earthquake and heavy wind actions. The complete failure of the structures that has occurred in the past due to catastrophic earthquakes may be avoided with the use of such devices. The study is concerned with the use of accordion metallic dampers that uses hysteretic energy to dissipate the unwanted energy due to earthquake. It consists of corrugated thin wall tubes installed as a brace connection in the frame. The axial deformation of the accordion damper enhances the lateral buckling capacity and results in maximum reduction of the damaging measures. The study emphasizes the use of such dampers and in depth analysis is performed by subjecting the building to base excitations in order to assess the nonlinear performance of the dampers installed in the building Rahul Tahilyani | Dilip Budhlani ""Seismic Performance of Reinforced Cement Concrete Structures with and Without Viscous Dampers"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-2 , February 2020,
URL: https://www.ijtsrd.com/papers/ijtsrd30122.pdf
Paper Url : https://www.ijtsrd.com/engineering/civil-engineering/30122/seismic-performance-of-reinforced-cement-concrete-structures-with-and-without-viscous-dampers/rahul-tahilyani
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Parametric study on slender column for flat plate structureeSAT Journals
Abstract This paper deals with effect of slender column on flat plate structure. The column is called slender if the height of is increased for functional purpose. The study is conducted on 18 flat-plate reinforced cement concrete (RCC) structural models. Among these18 models, 54 columns at three different locations (i.e. corner, edge and inner columns) are chosen for study. The models are developed using ETABS Software. Parametric study is performed by considering six different height of column ranging from 3048 mm to 6858 mm, using an increment of 762 mm along with three slab panels of size 4572 mm x 4572 mm, 6096 mm x6096 mm and 7620 mm x 7620 mm with five panels in both ways, considering both gravity and environmental load. The effect of slenderness ratio on load carrying capacity, design load and steel ratio is considered along with this the effect of additional moment due to slender compression member is also taken into account. It is observed that, columns in flat-plate structures are generally very sensitive if they are slender. It is observed that as the column length increases from 5502 mm and further, the steel ratio suddenly increases and it exceeds maximum allowed. As slenderness ratio increases, ratio of design load to the critical buckling load increases. Also resulting in increase of additional moment, decreasing load carrying capacity of column. This forces the design engineer to study effect of different parameter of the structure while designing high rise flat plate structure. Keywords: Flat Plate Structure, ETABS, Slenderness, Environmental load, design load and buckling load.
Behavioural studies of floating column on framed structureeSAT Journals
Abstract RCC concrete column means cement concrete reinforced with steel bars, steel plates, steel mesh etc. to increase the tension withstanding capacity of the structure. The term floating column means that the column is floated between two floors. Various types of structures G+3, G+5 and G+10 for RCC column and floating column are analyzed. The difference between G+3, G+5 and G+ 10 structures are shown by graphs and charts. Comparison will be done on bending moment and shear force between these structures. This paper presents the analysis of floating column and RCC column by using STAAD PRO V8i. Keywords: Floating Column, RCC column shear force and bending moment.
Design optimization of excavator bucket using Finite Element MethodIjripublishers Ijri
An excavator is a typical hydraulic heavy-duty human-operated machine used in general versatile construction operations,
such as digging, ground leveling, carrying loads, dumping loads and straight traction. Normally backhoe excavators
are working under worst working conditions. Due to severe working conditions, excavator parts are subjected to
high loads and must work reliably under unpredictable working conditions. Thus, it is necessary for the designers to
provide not only an equipment of maximum reliability but also of minimum weight and cost, keeping design safe under
all loading conditions.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Performance evaluation of a multi storey car parking structure under strength...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Evaluation of the use of concentric steel bracing to improve seismic performa...eSAT Journals
Abstract Most of the existing RC frame structures were not designed to withstand seismic effect. To meet those criteria structures should be retrofitted and out of all available retrofitting techniques adding steel braces are considered to be most efficient technique to enhance the seismic performance of the RC frame structure. In the present study three types of buildings are considered i.e., (G+2), (G+5), (G+8) as low rise, medium rise, high rise respectively, and these buildings are assigned by four different types of braces namely X, V, Inverted V, Eccen Forward at the periphery bays of the building in three different pattern i.e., model A, model B and model C. And these buildings are analyzed by nonlinear pushover analysis by using SAP2000.It is observed that the hinges were first formed in beams and followed by columns in bare frame whereas hinges were first formed in braces and followed by columns and followed by beams in case of X, Eccen forward brace and in case of V and inverted V hinges are formed first in brace followed by beams and followed by columns. It is pointed out that RC frames which are assigned with inverted V brace has least shear force and bending moment in the beams when compared to the other brace frames and there is less amount of variations in axial force shear force and bending moment in case of column. Keywords: equivalent static analysis, steel braces, equivalent strut method
Joint SCH-NCMS Technical Assessment on Earthquake-damaged Heritage Structures...nccaofficial
Technical assessment done by the NCCA Subcommission on Heritage - National Committee on Monuments and Sites on Earthquake-damaged Heritage Structures in Bohol and Cebu (May 27-31, 2014)
Vulnerability and risk assessment of the Istanbul City for a given earthquake...Maryam Izadifar
Presentation of project in the course "Tools for Risk Mitigation" for M.Sc. "Civil Engineering for Risk Mitigation" at Politecnico di Milano.
Submitted by:
Maryam Izadifar, Alireza Babaee, Iman Gharraie, Tohid Hejazi
Submitted to:
Professor Scira Menoni
Experimental studies on confined steel concrete composite beams under pure be...eSAT Journals
Abstract
An experimental investigation of the ultimate strength and behaviour of a new type of composite beam called CSCC beam (Confined Steel Concrete Composite Beam) is a concrete beam shuttered with cold formed steel sheet which acts as a composite beam by means of shear connectors and bracings. Stud shear connectors are used to take up the bond between sheet and concrete. The passive confinement by the cold formed sheet in the sides and bottom influences the strength and ductility of the system. These beams are provides very good confinement of concrete. Totally eight CSCC beams are tested and the entire behaviour of the beams are monitored to predict the physical response of the beams under three different types loading such as pure bending, pure torsion and combined bending and torsion. Two point loading was obtained for pure bending. The deformation criteria (deflection, moment and flexural rigidity) are also included in the investigation throughout the entire load history experimentally. The results obtained by the experimental values which are found to be in good agreement.
Keywords—composite beams; pure bending
Seismic evelution of rc space frame with rectangular and equivalent square co...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Comparision of building for sesmic response by using base isolationeSAT Journals
Abstract
Throughout historic time Earthquakes are one of the natural hazards that occur due to sudden violent movement of earth’s
surface which causes damage to property, especially to man-made structures . Base isolation is one of the most powerful tools of
earthquake engineering pertaining to the passive structural vibration control technologies. The application of the base isolation
techniques to protect structures against damage from earthquake attacks has been considered as one of the most effective
approaches and has gained increasing acceptance during the last two decades. This paper present three dimensional nonlinear
time history analysis is performed on r/c building by the use of computer program SAP 2000 v12.0.0. The dynamic analysis of the
structure has been carried out and the performance of the building with and without isolator is studied. The main objective here is
to make seismic response control by providing Isolators and comparing between the fixed based and isolated base building.
Rubber bearing and Friction pendulum bearing are used
Keywords: Base Isolation; Seismic Response; Time History
Analysis of rc framed structures with central and partial openings in masonry...eSAT Journals
Abstract In Reinforced concrete frames the masonry infill walls are a common practice in countries like India, where the region is prone to seismic activity. In general, the masonry infill walls are treated as nonstructural element in structural analysis and only the contribution of its mass for is considered and it’s structural parameters like strength and stiffness is generally ignored in practice, such an approach may lead to an unsafe design. Infill walls resist lateral loads but because of the openings in the infill wall the resistance may slightly reduce. The IS code provisions do not provide guidelines for the analysis and design of RC frames with infill wall and for different percentage of openings. In this study, an office or residential building outer side central opening or outer side partial openings are used and analysis is carried for Bare Frame model, infill walls without opening, infill walls with outer periphery central opening and infill wall with outer periphery partial opening models. In ETABS software G+14 RC framed building models has been prepared, Equivalent Static Lateral force method, Response spectrum method has been performed for analysis as per IS 1893 : 2002 including p-delta effects. Storey displacement, Storey shear, Storey drift, with soft storey considering the effects of infill wall with central and partial openings are the parameters considered in this study. For modeling, the Equivalent diagonal strut method has been used to find out the width of Strut using FEMA 273 .The results for bare frame, infill wall, and infill wall with central and partial openings are discussed and conclusions are made. Keywords: Equivalent diagonal strut, stiffness, Drift limitation
Performance based seismic analysis of rc building considering the effect of d...eSAT Journals
Abstract Due to the present increase in world population, people in this world tend to occupy available locations present in any zone which also include zones falling in the high seismic zone categories. The buildings to be built in these seismic zones are more susceptible to earthquakes for obvious reasons, and the buildings constructed in such zones must be analysed and designed for the unpredictable earthquakes with unpredictable magnitudes by various lateral load resisting systems such as shear walls, bracings, tubular systems, coupled shear walls and even a combination of two load resisting systems called as dual systems. Present study includes linear-static and non-linear static analysis with different shear wall arrangements on dual systems such as flat slabs and shear walls & moment resisting frames and shear walls for different irregular plans using ETABS 9.7.4 software. Parameters such as point displacements, base shears, pushover curves are studied. Keywords: Dual Systems, Flat slabs, Pushover analysis, Shear walls.
Effect of base isolation in multistoried rc irregular building using time his...eSAT Journals
Abstract Base isolation (BI) is a technique that has been used around the world to protect the building structures from the damaging effects of earthquake. The installation of isolator in building at base level significantly increases the time period of the structure, which means it reduces the possibility of resonance of the structure giving rise to better seismic performance of the building. The study is performed to compare the effectiveness of base isolation in plan irregular and vertical irregular multi-storied RC frame building. For this study, 15 storied R.C frame building is considered and Time History analysis is carried out using ETABS 2013 software. The Lead Rubber Bearing (LRB) is designed as per UBC 97 code and the same was used for analysis of base isolation system. The results obtained from the analysis were time period and base shear. Time period for the base isolated structures are higher than that of the fixed base structure. Due to the presence of isolator, Base shear is significantly reduced in each direction (X and Y direction) as compared to fixed base building. It has been found that when compared to plan irregular base isolated building the vertical irregular building gives better performance in high seismic prone area by using isolators at the base of the building.
Keywords: Base isolation, Lead rubber bearing, Time history analysis, Irregular building
Behavior of plan irregularites using composite members by varying column spac...eSAT Journals
Abstract
Several studies proofs that the weaker columns has low seismic resistance, for this it is need to make the column stronger. The stronger columns can be obtained by many ways, here in this paper steel-concrete composite columns are considered. Use of composite columns in construction reduces the cross-section of the columns throughout the building and also increases the lateral-load resisting capacity to columns. The models consists of G+10, G+15, G+20 stories of Rectangular, L, T and plus shaped structures in which column spacing are varied as 3m, 4m, 5m and 6m along both directions in all structures. For all models the composite-column of size 450x450mm (ISMB 250) is kept constant, only the beam size has been varied accordingly while modeling a structure. The Response Spectrum analysis is done for all the buildings using ETABS version 15. Study is based on the performance of a multi-story building with plan irregularity under major earthquake forces by considering parameters like displacement, storey shear and drifts. Even though the cross section of the column considered is very small for tall buildings, the structure behaves stiff for severe seismic zone-V and also for different conditions; this is done by introducing steel-concrete composite column in a given building. Hence it is concluded that the use of composite columns in construction resists the lateral forces for many vulnerable conditions.
Keywords: Composite Column, Irregular Structure, Seismic Zone, Varying Height, Column Spacing.
Seismic behavior of elevated water tankeSAT Journals
Abstract Hydrodynamic analysis of elevated water tank is a complex procedure involving fluid structure interaction. The elevated tank supports large water mass at the top of slender staging. In case of elevated tank the resistance against lateral forces exerted by earthquake is largely dependent of supporting system. Staging is considered to be a critical element as far as lateral resistance is concern. Satisfactory performance of staging during strong ground shaking is crucial. In this paper seismic behavior of elevated water tank in view point of their supporting system is evaluated using finite element software ETABS. The main objective is to evaluate a performance of different staging system for elevated water tank using finite element software ETABS. The spring mass model consisting of impulsive and convective masses as per IS 1893:2002 Part 2 has been used for the analysis. The parametric study is performed on mathematical model with different staging system to evaluate their performance with regard to lateral stiffness, displacement, time period, seismic base shear, overturning moment, flexure etc. Keywords: Hydrodynamic analysis, Staging Performance, spring mass model, ETABS
Seismic performance assessment of the torsional effect in asymmetric structur...eSAT Journals
Abstract In the recent time we come across many structures which are irregular in shape, this type of cannot be avoided due to the functional and architectural requirements. These type of structures have irregular distribution of centre of mass and centre of rigidity which causes the torsional effect on the structures which is one of the most important factor influencing the seismic damage of the structure. Structures with asymmetric distribution of mass and rigidity undergoes torsional motions during earthquake. To assess the torsional effect on the structures in the present study four types of structures are considered with varying eccentricity subjected to Pushover Analysis and Non-Linear Time History Analysis. The performance of the structures are assessed as per the procedure prescribe in ATC-40 and FEMA-356. The analysis of the structural models is done in ETABS. The results have shown that the structures with less eccentricity and in the direction of the columns orientation are performing well, also ductility, drift, and lateral displacement depends on the eccentricity of the structures. Key Words: Symmetric Structure, Asymmetric Structure, Pushover Analysis, Non-Linear Time History Analysis.
Dynamic analysis of a reinforced concrete horizontal curved beam using softwareeSAT Journals
Abstract
Dynamic analysis of a reinforced concrete beam bridge, horizontally curved in plan is done using a finite element software. The
support conditions considered are simple supports. Dynamic loading in the form of moving vehicular load is taken into account
for the purpose of analysis. IRC Class AA type of vehicle is simulated on two lanes on the beam of span 31m, having a box type
cross-section. A parametric study is done varying the radius of curvature of the beam from 50 m to 250 m with the interval of 50
m to check the behavior of the beam. Various responses of the beam like bending moment, shear force, torsional moment and
deflection are calculated. The influence of a non-dimensional parameter L/R i.e. ratio of length of the beam to radius of curvature
of the beam is verified for the responses of the beam. From the results, it has been found that the responses i.e. the bending
moment, shear force, torsional moment and deflection of the beam decrease as the radius of curvature of the beam in increased.
Also, the responses of the beam increase as the L/R ratio is increased.
Keywords: Dynamic analysis, horizontally curved beam, finite element, moving vehicular moving load, Simply
Supported, Box type, parametric study, L/R ratio
Evaluation of punching shear in flat slabseSAT Journals
Abstract
Flat-slab construction has been widely used in construction today because of many advantages that it offers. The basic philosophy in
the design of flat slab is to consider only gravity forces; this method ignores the effect of punching shear due to unbalanced moments
at the slab column junction which is critical. An attempt has been made to generate generalized design sheets which accounts both
punching shear due to gravity loads and unbalanced moments for cases (a) interior column; (b) edge column (bending perpendicular
to shorter edge); (c) edge column (bending parallel to shorter edge); (d) corner column. These design sheets are prepared as per
codal provisions of IS 456-2000. These design sheets will be helpful in calculating the shear reinforcement to be provided at the
critical section which is ignored in many design offices. Apart from its usefulness in evaluating punching shear and the necessary
shear reinforcement, the design sheets developed will enable the designer to fix the depth of flat slab during the initial phase of the
design.
Keywords: Flat slabs, punching shear, unbalanced moment.
Evaluation of punching shear in flat slabseSAT Journals
Abstract
Flat-slab construction has been widely used in construction today because of many advantages that it offers. The basic philosophy in
the design of flat slab is to consider only gravity forces; this method ignores the effect of punching shear due to unbalanced moments
at the slab column junction which is critical. An attempt has been made to generate generalized design sheets which accounts both
punching shear due to gravity loads and unbalanced moments for cases (a) interior column; (b) edge column (bending perpendicular
to shorter edge); (c) edge column (bending parallel to shorter edge); (d) corner column. These design sheets are prepared as per
codal provisions of IS 456-2000. These design sheets will be helpful in calculating the shear reinforcement to be provided at the
critical section which is ignored in many design offices. Apart from its usefulness in evaluating punching shear and the necessary
shear reinforcement, the design sheets developed will enable the designer to fix the depth of flat slab during the initial phase of the
design.
Keywords: Flat slabs, punching shear, unbalanced moment.
Non linear static pushover analysis of irregular space frame structure with a...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Free vibrational analysis of curved beam with uniform rectangular cross sectioneSAT Journals
Abstract
Curved beams are plays an important role in different field like house roofing, bridges, cranes, automobiles chasses etc. The study
deals with the investigation of free vibrations of thick curved beams of SS316 and MS1018, both experimentally and using ANSYS.
The curved beams having different R/t ratio were fabricated by using mild steel material. Three different boundary conditions are
imposed for curved beams are as follows; free-free, clamped-free, clamped-clamped. For experimental investigation, magnetic
transducer and VIBXpert are used to conduct experiment on different curved beams. The present work also aims at developing a
numerical model for comparing ANSYS results with experimental results to analyze the frequencies and mode shapes
corresponding to three different boundary conditions. The curved beam were modelled, meshed and analyzed using ANSYS. The
first ten natural frequencies from finite element solutions are then compared with the experimental results. These effects also
become more significant for higher modes. It is also observed that the finite element solutions are closely in agreement with
experimental results.
Key words: Curved beams, Experimental investigation, Natural frequencies, modes
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
A study of r.c.c. beam column connection subjected to monotonic loadingeSAT Journals
Abstract
Beam and column where intersects is called as joint or Connection. The different types of joints are classified as corner joint, exterior
joint, interior joint etc. on beam column joint applying quasi-static loading .i. e. monotonic loading on cantilever end of the beam and
study of various parameters as to be find out on corner and exterior beam column joint i.e. maximum stress, minimum stress,
displacement and variation in stiffness of beam column joint can be analyzed in Ansys software ( Non-Linear FEM Software) The
various research studies focused on corner and exterior beam column joints and their behavior, support conditions of beam-column
joints. Some recent experimental studies, however, addressed beam-column joints of substandard RC frames with weak columns, poor
anchorage of longitudinal beam bars and insufficient transverse reinforcement. the behavior of exterior beam column joint is different
than the corner beam column joint.
Keywords: beam, column, corner, exterior, joint, monotonic load, quasi-static, varying stiffness
A study of r.c.c. beam column connection subjected to monotonic loadingeSAT Journals
Abstract
Beam and column where intersects is called as joint or Connection. The different types of joints are classified as corner joint, exterior
joint, interior joint etc. on beam column joint applying quasi-static loading .i. e. monotonic loading on cantilever end of the beam and
study of various parameters as to be find out on corner and exterior beam column joint i.e. maximum stress, minimum stress,
displacement and variation in stiffness of beam column joint can be analyzed in Ansys software ( Non-Linear FEM Software) The
various research studies focused on corner and exterior beam column joints and their behavior, support conditions of beam-column
joints. Some recent experimental studies, however, addressed beam-column joints of substandard RC frames with weak columns, poor
anchorage of longitudinal beam bars and insufficient transverse reinforcement. the behavior of exterior beam column joint is different
than the corner beam column joint.
Keywords: beam, column, corner, exterior, joint, monotonic load, quasi-static, varying stiffness.
Seismic analysis of high damping rubber bearings for base isolationeSAT Journals
Abstract
Base isolation is a mechanism that provides earthquake resistance to the new structure. The base isolation system decouples the building from the horizontal ground motion induced by earthquake, and offers very stiff vertical components to the base level of the superstructure in connection to substructure (foundation). It shifts the fundamental lateral period, dissipates the energy in damping, and reduces the amount of the lateral forces that transferred to the building, inter-story drift, and the floor acceleration.
The work deals with modelling and finite element analysis of a high damping rubber bearing in ANSYS 12.0. A displacement controlled transient analysis was done to analyse the behaviour of the isolator during earthquakes.
Keywords: Base isolation, High damping rubber, Transient analysis
Similar to Seismic vulnerability of flat plate column joint with out slab shear reinforcement (20)
Mechanical properties of hybrid fiber reinforced concrete for pavementseSAT Journals
Abstract
The effect of addition of mono fibers and hybrid fibers on the mechanical properties of concrete mixture is studied in the present
investigation. Steel fibers of 1% and polypropylene fibers 0.036% were added individually to the concrete mixture as mono fibers and
then they were added together to form a hybrid fiber reinforced concrete. Mechanical properties such as compressive, split tensile and
flexural strength were determined. The results show that hybrid fibers improve the compressive strength marginally as compared to
mono fibers. Whereas, hybridization improves split tensile strength and flexural strength noticeably.
Keywords:-Hybridization, mono fibers, steel fiber, polypropylene fiber, Improvement in mechanical properties.
Material management in construction – a case studyeSAT Journals
Abstract
The objective of the present study is to understand about all the problems occurring in the company because of improper application
of material management. In construction project operation, often there is a project cost variance in terms of the material, equipments,
manpower, subcontractor, overhead cost, and general condition. Material is the main component in construction projects. Therefore,
if the material management is not properly managed it will create a project cost variance. Project cost can be controlled by taking
corrective actions towards the cost variance. Therefore a methodology is used to diagnose and evaluate the procurement process
involved in material management and launch a continuous improvement was developed and applied. A thorough study was carried
out along with study of cases, surveys and interviews to professionals involved in this area. As a result, a methodology for diagnosis
and improvement was proposed and tested in selected projects. The results obtained show that the main problem of procurement is
related to schedule delays and lack of specified quality for the project. To prevent this situation it is often necessary to dedicate
important resources like money, personnel, time, etc. To monitor and control the process. A great potential for improvement was
detected if state of the art technologies such as, electronic mail, electronic data interchange (EDI), and analysis were applied to the
procurement process. These helped to eliminate the root causes for many types of problems that were detected.
Managing drought short term strategies in semi arid regions a case studyeSAT Journals
Abstract
Drought management needs multidisciplinary action. Interdisciplinary efforts among the experts in various fields of the droughts
prone areas are helpful to achieve tangible and permanent solution for this recurring problem. The Gulbarga district having the total
area around 16, 240 sq.km, and accounts 8.45 per cent of the Karnataka state area. The district has been situated with latitude 17º 19'
60" North and longitude of 76 º 49' 60" east. The district is situated entirely on the Deccan plateau positioned at a height of 300 to
750 m above MSL. Sub-tropical, semi-arid type is one among the drought prone districts of Karnataka State. The drought
management is very important for a district like Gulbarga. In this paper various short term strategies are discussed to mitigate the
drought condition in the district.
Keywords: Drought, South-West monsoon, Semi-Arid, Rainfall, Strategies etc.
Life cycle cost analysis of overlay for an urban road in bangaloreeSAT Journals
Abstract
Pavements are subjected to severe condition of stresses and weathering effects from the day they are constructed and opened to traffic
mainly due to its fatigue behavior and environmental effects. Therefore, pavement rehabilitation is one of the most important
components of entire road systems. This paper highlights the design of concrete pavement with added mono fibers like polypropylene,
steel and hybrid fibres for a widened portion of existing concrete pavement and various overlay alternatives for an existing
bituminous pavement in an urban road in Bangalore. Along with this, Life cycle cost analyses at these sections are done by Net
Present Value (NPV) method to identify the most feasible option. The results show that though the initial cost of construction of
concrete overlay is high, over a period of time it prove to be better than the bituminous overlay considering the whole life cycle cost.
The economic analysis also indicates that, out of the three fibre options, hybrid reinforced concrete would be economical without
compromising the performance of the pavement.
Keywords: - Fatigue, Life cycle cost analysis, Net Present Value method, Overlay, Rehabilitation
Laboratory studies of dense bituminous mixes ii with reclaimed asphalt materialseSAT Journals
Abstract
The issue of growing demand on our nation’s roadways over that past couple of decades, decreasing budgetary funds, and the need to
provide a safe, efficient, and cost effective roadway system has led to a dramatic increase in the need to rehabilitate our existing
pavements and the issue of building sustainable road infrastructure in India. With these emergency of the mentioned needs and this
are today’s burning issue and has become the purpose of the study.
In the present study, the samples of existing bituminous layer materials were collected from NH-48(Devahalli to Hassan) site.The
mixtures were designed by Marshall Method as per Asphalt institute (MS-II) at 20% and 30% Reclaimed Asphalt Pavement (RAP).
RAP material was blended with virgin aggregate such that all specimens tested for the, Dense Bituminous Macadam-II (DBM-II)
gradation as per Ministry of Roads, Transport, and Highways (MoRT&H) and cost analysis were carried out to know the economics.
Laboratory results and analysis showed the use of recycled materials showed significant variability in Marshall Stability, and the
variability increased with the increase in RAP content. The saving can be realized from utilization of recycled materials as per the
methodology, the reduction in the total cost is 19%, 30%, comparing with the virgin mixes.
Keywords: Reclaimed Asphalt Pavement, Marshall Stability, MS-II, Dense Bituminous Macadam-II
Laboratory investigation of expansive soil stabilized with natural inorganic ...eSAT Journals
Abstract
Soil stabilization has proven to be one of the oldest techniques to improve the soil properties. Literature review conducted revealed
that uses of natural inorganic stabilizers are found to be one of the best options for soil stabilization. In this regard an attempt has
been made to evaluate the influence of RBI-81 stabilizer on properties of black cotton soil through laboratory investigations. Black
cotton soil with varying percentages of RBI-81 viz., 0, 0.5, 1, 1.5, 2, and 2.5 percent were studied for moisture density relationships
and strength behaviour of soils. Also the effect of curing period was evaluated as literature review clearly emphasized the strength
gain of soils stabilized with RBI-81 over a period of time. The results obtained shows that the unconfined compressive strength of
specimens treated with RBI-81 increased approximately by 250% for a curing period of 28 days as compared to virgin soil. Further
the CBR value improved approximately by 400%. The studies indicated an increasing trend for soil strength behaviour with
increasing percentage of RBI-81 suggesting its potential applications in soil stabilization.
Influence of reinforcement on the behavior of hollow concrete block masonry p...eSAT Journals
Abstract
Reinforced masonry was developed to exploit the strength potential of masonry and to solve its lack of tensile strength. Experimental
and analytical studies have been carried out to investigate the effect of reinforcement on the behavior of hollow concrete block
masonry prisms under compression and to predict ultimate failure compressive strength. In the numerical program, three dimensional
non-linear finite elements (FE) model based on the micro-modeling approach is developed for both unreinforced and reinforced
masonry prisms using ANSYS (14.5). The proposed FE model uses multi-linear stress-strain relationships to model the non-linear
behavior of hollow concrete block, mortar, and grout. Willam-Warnke’s five parameter failure theory has been adopted to model the
failure of masonry materials. The comparison of the numerical and experimental results indicates that the FE models can successfully
capture the highly nonlinear behavior of the physical specimens and accurately predict their strength and failure mechanisms.
Keywords: Structural masonry, Hollow concrete block prism, grout, Compression failure, Finite element method,
Numerical modeling.
Influence of compaction energy on soil stabilized with chemical stabilizereSAT Journals
Abstract
Increase in traffic along with heavier magnitude of wheel loads cause rapid deterioration in pavements. There is a need to improve
density, strength of soil subgrade and other pavement layers. In this study an attempt is made to improve the properties of locally
available loamy soil using twin approaches viz., i) increasing the compaction of soil and ii) treating the soil with chemical stabilizer.
Laboratory studies are carried out on both untreated and treated soil samples compacted by different compaction efforts. Studies
show that increase in compaction effort results in increase in density of soil. However in soil treated with chemical stabilizer, rate of
increase in density is not significant. The soil treated with chemical stabilizer exhibits improvement in both strength and performance
properties.
Keywords: compaction, density, subgradestabilization, resilient modulus
Geographical information system (gis) for water resources managementeSAT Journals
Abstract
Water resources projects are inherited with overlapping and at times conflicting objectives. These projects are often of varied sizes
ranging from major projects with command areas of millions of hectares to very small projects implemented at the local level. Thus,
in all these projects there is seldom proper coordination which is essential for ensuring collective sustainability.
Integrated watershed development and management is the accepted answer but in turn requires a comprehensive framework that can
enable planning process involving all the stakeholders at different levels and scales is compulsory. Such a unified hydrological
framework is essential to evaluate the cause and effect of all the proposed actions within the drainage basins.
The present paper describes a hydrological framework developed in the form of a Hydrologic Information System (HIS) which is
intended to meet the specific information needs of the various line departments of a typical State connected with water related aspects.
The HIS consist of a hydrologic information database coupled with tools for collating primary and secondary data and tools for
analyzing and visualizing the data and information. The HIS also incorporates hydrological model base for indirect assessment of
various entities of water balance in space and time. The framework would be maintained and updated to reflect fully the most
accurate ground truth data and the infrastructure requirements for planning and management.
Keywords: Hydrological Information System (HIS); WebGIS; Data Model; Web Mapping Services
Forest type mapping of bidar forest division, karnataka using geoinformatics ...eSAT Journals
Abstract
The study demonstrate the potentiality of satellite remote sensing technique for the generation of baseline information on forest types
including tree plantation details in Bidar forest division, Karnataka covering an area of 5814.60Sq.Kms. The Total Area of Bidar
forest division is 5814Sq.Kms analysis of the satellite data in the study area reveals that about 84% of the total area is Covered by
crop land, 1.778% of the area is covered by dry deciduous forest, 1.38 % of mixed plantation, which is very threatening to the
environmental stability of the forest, future plantation site has been mapped. With the use of latest Geo-informatics technology proper
and exact condition of the trees can be observed and necessary precautions can be taken for future plantation works in an appropriate
manner
Keywords:-RS, GIS, GPS, Forest Type, Tree Plantation
Factors influencing compressive strength of geopolymer concreteeSAT Journals
Abstract
To study effects of several factors on the properties of fly ash based geopolymer concrete on the compressive strength and also the
cost comparison with the normal concrete. The test variables were molarities of sodium hydroxide(NaOH) 8M,14M and 16M, ratio of
NaOH to sodium silicate (Na2SiO3) 1, 1.5, 2 and 2.5, alkaline liquid to fly ash ratio 0.35 and 0.40 and replacement of water in
Na2SiO3 solution by 10%, 20% and 30% were used in the present study. The test results indicated that the highest compressive
strength 54 MPa was observed for 16M of NaOH, ratio of NaOH to Na2SiO3 2.5 and alkaline liquid to fly ash ratio of 0.35. Lowest
compressive strength of 27 MPa was observed for 8M of NaOH, ratio of NaOH to Na2SiO3 is 1 and alkaline liquid to fly ash ratio of
0.40. Alkaline liquid to fly ash ratio of 0.35, water replacement of 10% and 30% for 8 and 16 molarity of NaOH and has resulted in
compressive strength of 36 MPa and 20 MPa respectively. Superplasticiser dosage of 2 % by weight of fly ash has given higher
strength in all cases.
Keywords: compressive strength, alkaline liquid, fly ash
Experimental investigation on circular hollow steel columns in filled with li...eSAT Journals
Abstract
Composite Circular hollow Steel tubes with and without GFRP infill for three different grades of Light weight concrete are tested for
ultimate load capacity and axial shortening , under Cyclic loading. Steel tubes are compared for different lengths, cross sections and
thickness. Specimens were tested separately after adopting Taguchi’s L9 (Latin Squares) Orthogonal array in order to save the initial
experimental cost on number of specimens and experimental duration. Analysis was carried out using ANN (Artificial Neural
Network) technique with the assistance of Mini Tab- a statistical soft tool. Comparison for predicted, experimental & ANN output is
obtained from linear regression plots. From this research study, it can be concluded that *Cross sectional area of steel tube has most
significant effect on ultimate load carrying capacity, *as length of steel tube increased- load carrying capacity decreased & *ANN
modeling predicted acceptable results. Thus ANN tool can be utilized for predicting ultimate load carrying capacity for composite
columns.
Keywords: Light weight concrete, GFRP, Artificial Neural Network, Linear Regression, Back propagation, orthogonal
Array, Latin Squares
Experimental behavior of circular hsscfrc filled steel tubular columns under ...eSAT Journals
Abstract
This paper presents an outlook on experimental behavior and a comparison with predicted formula on the behaviour of circular
concentrically loaded self-consolidating fibre reinforced concrete filled steel tube columns (HSSCFRC). Forty-five specimens were
tested. The main parameters varied in the tests are: (1) percentage of fiber (2) tube diameter or width to wall thickness ratio (D/t
from 15 to 25) (3) L/d ratio from 2.97 to 7.04 the results from these predictions were compared with the experimental data. The
experimental results) were also validated in this study.
Keywords: Self-compacting concrete; Concrete-filled steel tube; axial load behavior; Ultimate capacity.
Evaluation of performance of intake tower dam for recent earthquake in indiaeSAT Journals
Abstract
Intake towers are typically tall, hollow, reinforced concrete structures and form entrance to reservoir outlet works. A parametric
study on dynamic behavior of circular cylindrical towers can be carried out to study the effect of depth of submergence, wall thickness
and slenderness ratio, and also effect on tower considering dynamic analysis for time history function of different soil condition and
by Goyal and Chopra accounting interaction effects of added hydrodynamic mass of surrounding and inside water in intake tower of
dam
Key words: Hydrodynamic mass, Depth of submergence, Reservoir, Time history analysis,
Evaluation of operational efficiency of urban road network using travel time ...eSAT Journals
Abstract
Efficiency of the road network system is analyzed by travel time reliability measures. The study overlooks on an important measure of
travel time reliability and prioritizing Tiruchirappalli road network. Traffic volume and travel time were collected using license plate
matching method. Travel time measures were estimated from average travel time and 95th travel time. Effect of non-motorized vehicle
on efficiency of road system was evaluated. Relation between buffer time index and traffic volume was created. Travel time model has
been developed and travel time measure was validated. Then service quality of road sections in network were graded based on
travel time reliability measures.
Keywords: Buffer Time Index (BTI); Average Travel Time (ATT); Travel Time Reliability (TTR); Buffer Time (BT).
Estimation of surface runoff in nallur amanikere watershed using scs cn methodeSAT Journals
Abstract
The development of watershed aims at productive utilization of all the available natural resources in the entire area extending from
ridge line to stream outlet. The per capita availability of land for cultivation has been decreasing over the years. Therefore, water and
the related land resources must be developed, utilized and managed in an integrated and comprehensive manner. Remote sensing and
GIS techniques are being increasingly used for planning, management and development of natural resources. The study area, Nallur
Amanikere watershed geographically lies between 110 38’ and 110 52’ N latitude and 760 30’ and 760 50’ E longitude with an area of
415.68 Sq. km. The thematic layers such as land use/land cover and soil maps were derived from remotely sensed data and overlayed
through ArcGIS software to assign the curve number on polygon wise. The daily rainfall data of six rain gauge stations in and around
the watershed (2001-2011) was used to estimate the daily runoff from the watershed using Soil Conservation Service - Curve Number
(SCS-CN) method. The runoff estimated from the SCS-CN model was then used to know the variation of runoff potential with different
land use/land cover and with different soil conditions.
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watershed. Hence, in the present study an attempt has been made to understand the hydrological process of the catchment at the
watershed level by drawing the inferences from moprhometric analysis and runoff. The study area chosen for the present study is
Yagachi catchment situated in Chickamaglur and Hassan district lies geographically at a longitude 75⁰52’08.77”E and
13⁰10’50.77”N latitude. It covers an area of 559.493 Sq.km. Morphometric analysis is carried out to estimate morphometric
parameters at Micro-watershed to understand the hydrological response of the catchment at the Micro-watershed level. Daily runoff
is estimated using USDA SCS curve number model for a period of 10 years from 2001 to 2010. The rainfall runoff relationship of the
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aspect ratio, skew angle and type of load. The finite-element analysis results for skewed bridges are compared to the reference
straight bridges for dead load, IRC Class A loading and IRC 70R loading for with and without edge beam. A total of 90 bridge models
are analyzed. The variation of maximum deflection, maximum longitudinal sagging bending moment, maximum torsional moment, and
maximum support reaction with skew angle is studied for all 90 bridge deck models. The FEA results of Dead load and Live load
bending moments and deflections decreases with increase in skew angle, where as maximum support reactions increases with increase
in skew angle and the maximum torsional moment increases with skew angle up to 45 degrees and there after decreases. The benefit
of providing edge beam is reflected in significant decrease in deflection, longitudinal bending moment and torsional moment.
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and IRC Class 70R loading.
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Seismic vulnerability of flat plate column joint with out slab shear reinforcement
1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 738
SEISMIC VULNERABILITY OF FLAT PLATE COLUMN JOINT WITH
OUT SLAB SHEAR REINFORCEMENT
Kavitha S1
, Umadevi R2
, Sugandha N3
1
Reasearch scholar, Department of civil engineering, Acs college of engineering, karnataka, India
2
Assistant professor, Department of civil engineering, Acs college of engineering, karnataka, India
3
Assistant professor, Department of civil engineering, Acs college of engineering, karnataka, India
Abstract
During an earthquake, a brittle punching failure can arise in flat plate-column connections due to poor transfer capacity of
shearing forces and unbalanced moments. To increase the shear capacity of the slab, various types of shear reinforcement can be
used in the slab around the connection. The aim of the project is to study the response of slab column connections containing
without slab shear reinforcement when subjected to combined gravity and cyclic lateral loading. At first a calibration model was
developed to simulate the tested flat plate-column joint using finite element analysis program MASA. This model was used to
predict the load displacement behaviour. The predicted behaviour was compared with the observed behaviour as reported by
James Lee & Ian Robertson (Ref.4). The comparison showed that the model predicts the load level excellently but significantly
over estimates the stiffness of the joint compared to that observed by James Lee & Ian Robertson. Since the present study is to
compare the relative behaviour of slab-column joints provided without slab shear reinforcement, the error in the estimation of
joint stiffness will not alter the comparative conclusions drawn. Thus, the developed model was validated for application to
various types of column slab connection behaviour.
Keywords: Flat plate, slab column joint, punching shear, Drift and cyclic lateral loading
--------------------------------------------------------------------***----------------------------------------------------------------------
1. INTRODUCTION
Flat plate is one of the most common floor systems for large
span commercial buildings. The advantages of a flat-Plate
floor system are numerous. It provides architectural
flexibility, more clear space, less building height, easier
form work, and, consequently, shorter construction time.
Low floor to floor heights reduce the total building height,
thus reducing lateral loads, cost of building cladding, cost of
vertical mechanical and electrical lines, and air
conditioning/heating costs. For vertical loads, the structural
performance and design of flat plates are well established.
Under lateral loads, many aspects of the behavior of flat
plates are uncertain. A serious problem that can arise in flat
plates is brittle Punching Shear failure due to poor transfer
capacity of shearing forces and unbalanced moments
between slabs and columns. In seismic zones, a structure can
be subjected to strong ground motions, and, for economical
design, a structure is considered to undergo deformations in
the inelastic range, therefore, in addition to strength
requirement, slab-column connections must undergo these
inelastic deformations without premature punching or shear
failure. In other words slab column connections must have
adequate ductility.
2. METHODOLOGY
Literature review on studies of slab column joints and
Finite element analysis of reinforced concrete
structures.
Developing of calibration model to simulate the tested
flat plate-column connections.
Developing of finite element model to study the
behavior of flat plate-column connections without slab
shear reinforcement.
Come up with recommendations to improve the
ductility of flat plate column joint under seismic loads.
3. EXPERIMENTAL SETUP
The finite element model of a flat plate-column joint an
experimental load deformation behavior of a reinforced
concrete flat plate-column joint without slab shear
Reinforcement reported by James Lee & Ian Robertson
(Ref. 4) is considered for the study. The experimental details
are discussed here. The test specimen represents an interior
flat-slab and column connection in a prototype flat plate
building, as shown in figures 1 and 2. The specimen was
tested in a steel reaction frame as shown in Figure 3. The
slab reinforcement consisted of Fe 420 grade reinforcement
bars distributed as shown in figure 4. The steel in the slab
ran in both directions and three top and three bottom
reinforcement bars passed through the column. The column
was designed so as not to yield prior to slab flexural
yielding. The predetermined cyclic lateral displacement
routine was applied at the top of the column through a
displacement-controlled actuator. The lateral displacement
routine used in the test is as shown in figure 5.
2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 739
Fig. 1 Prototype structure
Fig. 2 Test specimen
Fig. 3 Test setup
The test specimen supported a peak lateral load of 38.3kN at
+ 3.5% drift. It then experienced punching shear failure. The
punching shear failure in Specimen resulted in a rupture at
the surface of the slab (Fig.7). Failure was abrupt and
occurred without warning. The figure 6 shows hysteretic
curve for test specimen without slab shear reinforcement.
Experimental results and The peak lateral load and drift at
peak lateral load observed in the experiment are shown in
the table 1
Table 1 Experimental results
Compressive
strength of
concrete
fc'
Peak
lateral
load
Drift at
peak
load
Unbalanced
moment
Mu
Shear
force
Vu
(MPa) (kN) (mm) (kN-m) (kN)
35.35 38.30 53.31 58.41 37.90
35.35 -33.60 -45.66 -51.24 39.90
Fig.4 Slab flexural and shear reinforcement layout
SPECIMEN
3. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 740
Fig 5 Lateral displacement routine adopted in the experiment
Fig 6 Load deflection hysteretic curve
Fig. 7 Crack Pattern and punching failure of Slab
4. FINITE ELEMENT MODEL:
Finite element modeling package, FEMAP is used to model
the Flat plate column joint. Following are the steps involved
in the modeling of joint.
Solid elements are used to model concrete and bar
elements are used to model reinforcement.
Slab is allowed to translate in loading direction
alone at load rod positions and constrained in other
(Y & Z) directions. Gravity load is applied on the
slab in the form of point loads.
Bottom of the column is hinge supported and the
predetermined cyclic lateral displacement routine is
applied at the top of the column.
4. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 741
The Bond to the reinforcement is modeled by
inputting Bond-Slip curve in the analysis.
The finite element model developed in FEMAP is
transferred to MASA for the analysis.
The finite element mesh for the Flat plate column
joint model is shown in figures 8 and 9 .The
reinforcement layout for model without slab shear
reinforcement is shown in figure 10.
Side View Isometric View
Fig 8 Geometry of the Model
Fig 9 Configuration of reinforcement bar elements for
model without slab shear reinforcement
Fig 10 Lateral displacement routine adopted in the modeling
4.1. Finite Element Model Results
The Finite element model supported a peak lateral load of
35.59kN at drift of 1.2%. The figure 11 shows hysteretic
curve for Finite element model.
Fig 11 Load deflection hysteretic curve for finite element
model
Side view
Isometric view
5. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 742
Reinforcing bars
Fig 12 Deformed Shape of the model in different views
Fig 13 Stress distribution in the elements
Table 2 Analysis results from MASA
Compressive
strength of
concrete
fc'
Peak
lateral
load
Drift at
peak
load
Unbalanced
moment
Mu
Shear
force
Vu
(MPa) (kN) (mm) (kN-m) (kN)
35.35 35.59 18.00 54.27 36.50
35.35 -28.13 -12.00 -42.90 34.90
5. COMPARISON OF EXPERIMENTAL AND
NUMERICAL RESULTS:
The comparison of load-deformation behavior of flat plate-
Column joint from experimental and numerical results is
shown in table 3.
Table 3 Comparison of experimental and numerical results
Results
from
Direction peak lateral
load(kn)
Drift at peak
load(mm)
Experiment Positive 38.30 53.31
Negative -33.60 -45.66
MASA Positive 35.59 18.00
Negative -28.13 -12.00
Above observations (table 3) indicate that the FE model
over-estimates the actual stiffness of the connection
Following parameters are examined in this paper.
Load deformation behavior.
Drift capacity-Interstory drift ratio is the difference
of lateral deflection between two successive floors
divided by the floor height. Drift ratios for flat
plate-column joint with out slab shear
reinforcement are compared and tabulated in the
table 4.
Table 4 Comparison of drift ratios
Type of Shear
Reinforcement
Cycle Drift at
Peak(%)
Drift at
Ultimate(%)
NS Positive 1.82 3.64
Negative -1.21 -3.64
Ductility-The model with no slab shear
reinforcement which failed due to punching shear
around the slab-column connection has the least
value of ductility.
Table 5 Comparison of Ductility values
Type of Shear
Reinforcement
Ductility
Positive Negative Cumulative
NS 2.67 3.00 5.67
6. CONCLUSION
Flat plate-column connections without slab shear
reinforcement are modeled and analyzed under combined
gravity and cyclic lateral loading. Based on comparison of
the results of these models, the following conclusions are
drawn:
Punching shear failure can arise in case of flat
plate-column joint without slab shear
reinforcement. It is brittle failure which reduces
lateral load carrying capacity of connection
suddenly.
May be Use of Slab shear reinforcement improves
the overall behavior of the connection in terms of
ductility, energy dissipation capacity, resisting
punching failure and drift capacity.
The ductility of the joint under monotonic loads is
significantly higher than that under cyclic loading.
Under Monotonic loading use of slab shear
reinforcement does not affect much the behavior of
connection.
Grade of steel of slab shear reinforcement does not
affect much the behavior of the connection.
The study needs to be extended to exterior slab-
column connections.
Refinement of deformation is necessary in the
modeling of joint.
An analytical model using strut and tie model needs
to be developed for slab column connections for its
analysis and design.
6. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 04 Issue: 04 | Apr-2015, Available @ http://www.ijret.org 743
ACKNOWLEDGEMENTS
I am thankfully to professor & Head, department of civil
engineering, Principal of ACS college of engineering and
my friends ,Bangalore, Karnataka India.
REFERENCES
[1]. ACI Committee 318 (2005), “Building Code
Requirement for Reinforced Concrete and
Commentary,” American Concrete Institute, Farmington
Hills, USA.
[2]. Amin Ghali., and Ramez B. Gayed. (2006), “Seismic-
Resistant Joints of Interior
Columns with Prestressed Slabs,” ACI Structural Journal,
Vol. 103, No.5, September-
October 2006, pp. 710-719.
[3]. Austin D. Pan., and Jack P. Moehle. (1992), “An
Experimental Study of Slab-Column
Connections,” ACI Structural Journal, Vol. 89, No.6,
November-December 1992, pp.626-638.
[4]. Ian N. Robertson., Tadashi Kawai., James Lee., and
Brian Enomoto. (2002), “Cyclic Testing of Slab-Column
Connections with Shear Reinforcement,” ACI Structural
Journal,Vol. 99, No.5, September-October 2002, pp. 605-
613.