Reinforced Concrete (RC) building frames are most common types of constructions in urban India. These are subjected to several types of forces during their lifetime, such as static forces due to dead and live loads and dynamic forces due to earthquake. In the present work, two tall buildings (a G+10 and a G+25 structure), presumed to be situated in seismic zone III, are analyzed by using two different methods viz. equivalent static analysis method and response spectrum method, using ETAB 15 software. From analysis results, the parameters like storey drift, storey displacement, Axial Load, Bending Moments are determined for comparative study. Results established the superiority of the Response spectrum method over the Equivalent static analysis method.
Comparative Study of Static and Dynamic Seismic Analysis of Multistoried RCC ...IJERA Editor
This document compares the static and dynamic seismic analysis of multi-story reinforced concrete buildings using the ETAB software. Two buildings, a 10-story and 25-story structure, located in seismic zone III are analyzed using the equivalent static analysis and response spectrum methods. Results show that the response spectrum method produces lower story drift, displacement, axial loads, and bending moments compared to the equivalent static analysis method. For the 10-story building, story drift is up to 25% lower, displacements are up to 26% lower, axial loads on columns are up to 8% lower, and beam end bending moments are up to 7% lower using the response spectrum method. Similarly, for the 25-story building, the response spectrum method
Study of Earthquake Forces By Changing the Location of Lift CoreIJERA Editor
1) The document studies the effects of changing the location of a lift core (elevator shaft) on the seismic performance of buildings.
2) Static and dynamic analyses were conducted on G+5 and G+10 buildings with the lift core located either in the center or corner, and on hard, medium, and soft soil.
3) The results show that buildings with a center lift core experienced less story drift, lower base shear, and longer natural periods compared to buildings with a corner lift core, indicating better seismic performance. Locating the lift core in the center helps reduce torsional effects.
Performance Evaluation of G+5, G+10 and G+15 Story Symmetric and Asymmetric B...IRJET Journal
This document presents the results of a study that evaluated the performance of symmetric and asymmetric buildings of varying heights (G+5, G+10, G+15 stories) under seismic loading, using pushover analysis. Five different building shapes were analyzed - H-shape, L-shape, long slender shape, rectangular shape, and T-shape. Pushover curves showed that symmetric buildings had much higher capacity than asymmetric buildings. Capacity spectrum analysis also indicated the long slender shape building had the highest capacity. Hinge formation analysis found that the long slender shape building developed the most hinges, while the H-shape building developed the fewest. Symmetric buildings were able to sustain higher base forces at lower displacements compared to asymmetric
Usage of N2 Method for the Performance Evaluation of Plan Asymmetric StructuresIRJET Journal
This document discusses using the N2 method to evaluate the seismic performance of plan asymmetric building structures. Five four-story building models located in seismic zone III are considered, including one regular model and four irregular models with different plan asymmetries. The N2 method combines nonlinear static pushover analysis of the multi-degree of freedom building models with response spectrum analysis of equivalent single-degree of freedom systems. Pushover curves are generated and converted to estimate seismic demands, represented by the performance point where capacity and demand curves intersect. Results for the regular and irregular models are compared in terms of parameters like story drift, displacement, and development of plastic hinges to assess the effects of plan irregularity.
Cost Analysis and Comparison of a Composite Diagrid Frame with Bare Frame und...IRJET Journal
1) The document compares the cost of constructing a G+11 story high-rise building with and without diagrid frames under dynamic loading conditions using STAAD.pro software.
2) The analysis found that introducing steel diagrid members decreases the cost of construction by allowing for smaller and lighter interior columns and beams.
3) A diagrid structure was also found to be capable of reducing the effects of dynamic loading on the building by decreasing story displacement, bending moment, shear force, and axial force compared to a bare frame structure.
This document analyzes and compares the axial forces, costs, and design of pad and pile footings for two identical 5-story residential buildings. It finds that pile footings require 29% more steel but 21% less concrete than pad footings. Pile footings cost 30-35% more to construct despite identical conditions. Mathematical models are developed that can predict footing costs from axial forces and compare costs between footing types. Pile footings are generally more expensive but may be necessary in poorer soil conditions. The models provide a useful tool for engineers and contractors.
The present work is focused on understanding the uplift capacity of vertical and inclined piles passing through two layered soil and subjected to the inclined loads. The study was carried out using finite element software MIDAS 3D. The foundation soil was modeled as an elasto-plastic material
obeying the Mohr-Coulomb failure criterion. The parametric studies were performed by varying the diameter of pile, angle of inclination of load (α) and pile angle (θ). It was observed that the uplift capacity of pile depends upon these parameters. The uplift capacity of pile varies with inclination of pile angle and inclination of load.
Comparative Study of Static and Dynamic Seismic Analysis of Multistoried RCC ...IJERA Editor
This document compares the static and dynamic seismic analysis of multi-story reinforced concrete buildings using the ETAB software. Two buildings, a 10-story and 25-story structure, located in seismic zone III are analyzed using the equivalent static analysis and response spectrum methods. Results show that the response spectrum method produces lower story drift, displacement, axial loads, and bending moments compared to the equivalent static analysis method. For the 10-story building, story drift is up to 25% lower, displacements are up to 26% lower, axial loads on columns are up to 8% lower, and beam end bending moments are up to 7% lower using the response spectrum method. Similarly, for the 25-story building, the response spectrum method
Study of Earthquake Forces By Changing the Location of Lift CoreIJERA Editor
1) The document studies the effects of changing the location of a lift core (elevator shaft) on the seismic performance of buildings.
2) Static and dynamic analyses were conducted on G+5 and G+10 buildings with the lift core located either in the center or corner, and on hard, medium, and soft soil.
3) The results show that buildings with a center lift core experienced less story drift, lower base shear, and longer natural periods compared to buildings with a corner lift core, indicating better seismic performance. Locating the lift core in the center helps reduce torsional effects.
Performance Evaluation of G+5, G+10 and G+15 Story Symmetric and Asymmetric B...IRJET Journal
This document presents the results of a study that evaluated the performance of symmetric and asymmetric buildings of varying heights (G+5, G+10, G+15 stories) under seismic loading, using pushover analysis. Five different building shapes were analyzed - H-shape, L-shape, long slender shape, rectangular shape, and T-shape. Pushover curves showed that symmetric buildings had much higher capacity than asymmetric buildings. Capacity spectrum analysis also indicated the long slender shape building had the highest capacity. Hinge formation analysis found that the long slender shape building developed the most hinges, while the H-shape building developed the fewest. Symmetric buildings were able to sustain higher base forces at lower displacements compared to asymmetric
Usage of N2 Method for the Performance Evaluation of Plan Asymmetric StructuresIRJET Journal
This document discusses using the N2 method to evaluate the seismic performance of plan asymmetric building structures. Five four-story building models located in seismic zone III are considered, including one regular model and four irregular models with different plan asymmetries. The N2 method combines nonlinear static pushover analysis of the multi-degree of freedom building models with response spectrum analysis of equivalent single-degree of freedom systems. Pushover curves are generated and converted to estimate seismic demands, represented by the performance point where capacity and demand curves intersect. Results for the regular and irregular models are compared in terms of parameters like story drift, displacement, and development of plastic hinges to assess the effects of plan irregularity.
Cost Analysis and Comparison of a Composite Diagrid Frame with Bare Frame und...IRJET Journal
1) The document compares the cost of constructing a G+11 story high-rise building with and without diagrid frames under dynamic loading conditions using STAAD.pro software.
2) The analysis found that introducing steel diagrid members decreases the cost of construction by allowing for smaller and lighter interior columns and beams.
3) A diagrid structure was also found to be capable of reducing the effects of dynamic loading on the building by decreasing story displacement, bending moment, shear force, and axial force compared to a bare frame structure.
This document analyzes and compares the axial forces, costs, and design of pad and pile footings for two identical 5-story residential buildings. It finds that pile footings require 29% more steel but 21% less concrete than pad footings. Pile footings cost 30-35% more to construct despite identical conditions. Mathematical models are developed that can predict footing costs from axial forces and compare costs between footing types. Pile footings are generally more expensive but may be necessary in poorer soil conditions. The models provide a useful tool for engineers and contractors.
The present work is focused on understanding the uplift capacity of vertical and inclined piles passing through two layered soil and subjected to the inclined loads. The study was carried out using finite element software MIDAS 3D. The foundation soil was modeled as an elasto-plastic material
obeying the Mohr-Coulomb failure criterion. The parametric studies were performed by varying the diameter of pile, angle of inclination of load (α) and pile angle (θ). It was observed that the uplift capacity of pile depends upon these parameters. The uplift capacity of pile varies with inclination of pile angle and inclination of load.
This document analyzes the behavior of 20-story reinforced concrete I-shaped buildings located in different seismic zones, considering the effects of plan dimensions, seismic zone, and infill walls. It is observed that maximum story drift occurs in Zone V. The presence of infill walls reduces story drifts. Both design ultimate positive and negative moments in transfer girders and main beams decrease when infill wall effects are included. The response spectrum method predicts lower maximum story drift than the equivalent lateral force method in most cases.
IRJET- Seismic Analysis of Regular and Irregular Buildings Having Fixed Base ...IRJET Journal
This document presents a seismic analysis of regular and irregular reinforced concrete buildings with both fixed bases and base isolators using time history analysis. The study models a 9-story building in regular, L-shaped, and T-shaped configurations with both fixed bases and base isolating units. Time history analyses are conducted using ground motion data from the 1995 Kozani and 1997 Jiashi earthquakes. Results for story displacements, moments, and axial forces are compared between the different building configurations and foundation types. In general, the analyses show that base isolating buildings experience lower seismic demands than identical buildings with fixed bases. Irregular buildings have higher displacements and forces than the regular building.
IRJET- Non-Linear Time History Analysis of the Horizontal and Vertical Asymme...IRJET Journal
This document discusses non-linear time history analysis of asymmetric buildings with horizontal and vertical irregularities. It summarizes that vertically geometrically irregular buildings experience the highest base torsion under seismic loading, while torsionally irregular buildings experience the highest among horizontally irregular structures. The analysis is performed using ETABS software on various irregularity models of 5-story buildings subjected to ground motion records.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Over the past decades, earthquake resistant design of building structures has been largely based on ductility design concept worldwide. The performance of the intended ductile structures during major earthquakes (e.g. Northridge, 1994; Kobe, 1995; Chi-Chi, 1999…etc) however have proven to be unsatisfactory and indeed far below expectation. So, performance based seismic design philosophies in seismic design has become the cardinal point of interest in civil engineering structures Due to the vulnerability of Bangladesh to earthquake, dynamic analysis should be introduced in major earthquake zone to ensure the seismic performance. To see the dynamic behavior of the structure, dynamic analysis should be performed for building with varying height. Dynamic analysis can take the form of a dynamic time history analysis or a linear response spectrum analysis. In this present study, a building of 15 stories with varying floor height has been modeled using software packages SAP2000 v15 for seismic zone of Bangladesh. Dynamic response of building under actual earthquakes, chi-chi, Taiwan, 1999, El centro and Northridge have been investigated. This paper highlights the effect of varying height in high-rise building with Time History Analysis.
This document summarizes research comparing the effects of complex urban geometries versus simplified representations in mesoscale modeling. It tests the hypothesis that cities can be accurately modeled as regular arrays of cubes or canopies. The document describes simulations of drag forces, shortwave radiation exchange, and wind flow for a real urban geometry compared to simplified representations of long canopies and cubes while keeping total built volume equal. Results show differences in drag, radiation absorption on walls and ground, and velocity fields between the real and simplified geometries.
IRJET- Evaluation of R.C. Multi-Storey Building Response under the Effect of ...IRJET Journal
This document evaluates the response of a 12-story reinforced concrete building with and without considering soil-structure interaction (SSI). The building is modeled in ETABS and its raft foundation is modeled in SAFE. Results show that accounting for SSI (modeling the building on flexible soil springs) increases story drift ratios, displacements, and bending moments compared to fixed-base modeling. SSI has an unfavorable effect and should be considered in seismic design for more accurate response evaluation.
This document examines the influence of plan irregularity on the seismic response of 10-story reinforced concrete buildings through static and dynamic analysis. Three building plans are considered - rectangular, C-shaped, and L-shaped. The buildings are modeled in SAP 2000 software and subjected to static, response spectrum, and time history analysis using records from three Indian earthquakes. Results show the L-shaped building experiences higher story shear and deflections compared to the other shapes. Time history analysis provides more realistic results than static or response spectrum analysis by applying actual earthquake accelerations. Plan irregularity influences seismic response, with more irregular shapes experiencing greater forces and deformations.
Effects of P-Delta on High Rise Buildings Located in Seismic ZonesIRJET Journal
The document analyzes the effects of P-Delta (the change in a structure's response due to the interaction between lateral/gravitational loads and deformations) on high-rise buildings in seismic zones. It models buildings with 10, 20, 30, and 40 stories in ETABS to analyze drift ratios, displacements, and member forces both with and without considering P-Delta effects. The results show increased drift ratios and displacements in the upper stories when P-Delta is considered. P-Delta effects become more significant with increasing building height and axial loads. The document recommends considering P-Delta effects in the analysis and design of buildings over 25 stories tall.
Study on Effects of P-Delta Analysis on RC StructuresIRJET Journal
This study examines the effects of P-delta analysis on reinforced concrete (RC) structures. Six building models of varying heights (5, 10, 15, 20, 25, and 30 stories) were analyzed with and without considering P-delta effects. P-delta effects refer to additional overturning moments generated in a structure due to the product of a structure's lateral displacement and gravity loads. The study found that considering P-delta effects led to increased story displacements, story drifts, and fundamental periods across all building heights compared to analyses that did not consider P-delta effects. Increases in story displacements and drifts were more significant for taller buildings and models in higher seismic zones. Accounting for P-delta
Comparative Analysis of Steel Telecommunication Tower Subjected to Seismic & ...civej
This document summarizes a study that analyzed steel telecommunication towers subjected to wind and seismic loads. Different tower heights (25m, 35m, and 45m) and bracing configurations were modeled and analyzed. Wind loads using the gust factor method and seismic loads using modal and response spectrum analyses were applied for various wind zones and seismic zones in India. The results of displacements at the tower tops and stresses in the bottom legs were compared. Braced towers had higher stresses in the bottom leg than unbraced towers. Taller towers experienced greater displacements, especially from 40m to 50m heights. This analysis provides insights into how wind and seismic forces impact tower structures of varying heights and bracing designs.
Comparative Analysis of Design Parameters for Multistoried Framed Structure u...paperpublications3
Abstract: In present study, Multistoried Framed Structure has been analyzed for different parameters of seismic forces and results so obtained have been compared to understand the effect of seismic forces under static and dynamic analysis. The variousdesign parameters such as beam moments, and storey drift have been evaluated for both static and dynamic analysis.
In this work Multistory Rigid Jointed Steel Framed Regular Building Modal has been analyzed by static, dynamic and pushover procedures. The post processing results obtained are compared to get some important concluding remarks. This study will emphasize on the requirement of non-linear analysis procedures with the existing linear analysis procedures provided by various codal provisions. Present study will help in evaluating the difference in various parameters during elastic (conventional) and inelastic (pushover) analysis.
IRJET- Reliability Analysis of High Rise BuildingIRJET Journal
This document analyzes the reliability of a 16-story building constructed with either concrete or expanded polystyrene (EPS) panels through modeling in ETABS software. Dynamic and wind analyses were performed to compare base shear, drift, and displacement between the materials. Results showed that using EPS reduced top displacement and inter-story drift by 40-50% compared to concrete, indicating EPS provides greater stability and meets reliability requirements for high-rise buildings.
Comparative Study of Various Seismic Analysis Methods for Rc StructureIJERA Editor
A large number of RC frame buildings have been built in India in recent years. Huge number of similarly designed and constructed buildings exist in the various towns and cities situated in moderate to severe seismic zones of the country. Analysis and design of such buildings for static forces is a routine affair these days because of availability of affordable computers and specialized programs which can be used for the analysis. On the other hand, dynamic analysis is a time consuming process and requires additional input related to mass of the structure, and an understanding of structural dynamics for interpretation of analytical results. Reinforced Concrete (RC) frame buildings are most common type of constructions in urban India, which are subjected to several types of forces during their lifetime, such as static forces due to dead and live loads and dynamic forces due to earthquake. To ensure safety against seismic forces of multi-storied building hence, there is need to study of seismic analysis to design earthquake resistance structures. In the present study a multi-storied framed structure is selected, And Linear seismic analysis is done for the building by static method (Equivalent Static Method) and dynamic method (Response Spectrum Method & Time history Method) using ETAB2016 as per the IS-1893-2002-Part-1. As a result, the response of structure has been obtained for considered building models, based on each methods of analysis, and then the results are compared with each other.
Numerical simulation of laterally loaded pileDr. Naveen BP
This document presents a finite element model simulation of a lateral load test on a 1m diameter bored pile embedded in residual soils. The pile and soil were modeled in PLAXIS 2D, with the soil represented by a Mohr-Coulomb model and the pile as a beam element. The model results showed good agreement with load-displacement curves from the field test. However, the field test was unable to apply loads high enough to reach design code displacement limits due to limitations of test equipment for large piles in residual soils. The numerical model can simulate larger displacements to evaluate pile behavior under higher loads.
Study on the Effect of Response Spectrum Analysis and Construction Sequence A...ijtsrd
This document presents a study on the effects of response spectrum analysis (RSA) and construction sequence analysis (CSA) on an 11-story setback steel structure building located in Mandalay, Myanmar. The building is analyzed using the ETABS software. RSA assumes the full loads are applied at once, while CSA considers the loading at each construction stage. Results show that CSA produces higher storey displacements (increased by 56% compared to RSA) and axial column forces (increased by 48% compared to RSA). Shear forces and bending moments are also higher with CSA than RSA. The study concludes that CSA provides a more realistic analysis that accounts for the sequential loading during construction.
IRJET- Experimental Study of Floating Column for Seismic Analysis of Multisto...IRJET Journal
This document summarizes an experimental study on the seismic analysis of a multi-story building with and without floating columns. Four building models were created - one without floating columns, and the others with a floating column at the 1st, 2nd, and 3rd floors. The models were analyzed using software to compare the base shear and story displacements under seismic loads. The results showed that buildings with floating columns experienced greater displacements and base shear compared to the building without floating columns, with the highest values for the model with a floating column at the 3rd floor. The study aims to evaluate the effect of floating columns on building behavior during earthquakes.
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
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
This document summarizes a dissertation analyzing the seismic performance of an irregular 11-story building with AAC blocks using the response spectrum method in ETABS. The objectives were to analyze and design the building economically according to codes while studying the effects of earthquake and wind loads. The methodology involved defining materials, loads, response spectra, and mass/diaphragm in ETABS to analyze and design the building. Results showed maximum displacements of 25.95mm, story shear of 3.138kN, and overturning moment of 75.980kNm. Reinforcement percentages ranged from 3.76% at the base to 0.8% in upper stories. The study concluded the AAC blocks provided a lighter and more econom
IRJET- Seismic Evaluation of RC Building Connected with and without Braced Fr...IRJET Journal
1) The document analyzes the seismic performance of reinforced concrete buildings connected with and without braced friction dampers through equivalent static analysis, response spectrum analysis, and pushover analysis.
2) Models of G+10 story symmetrical and asymmetrical buildings were analyzed, and results showed that buildings with friction dampers had lower displacement and drift but higher base shear compared to buildings without dampers.
3) Presence of friction dampers reduced the lateral displacement of buildings by 32.34% according to the analysis results. Lateral displacement from equivalent static analysis was also found to be less than that from response spectrum analysis.
Comparative study on multistoried building using linear and non linear analysisIJARIIT
The effect of infill walls on the building is generally neglected in the analysis. In fact, an infill wall contributes to the
lateral strength and stiffness of the structure. Seismic response analysis of multi storey building frame with infill was done by
modeling the infill wall as an equivalent diagonal strut. For the equivalent diagonal strut, the thickness is taken equal to the
thickness of the wall and width of the strut as per “Equivalent strut method”. The comparison of seismic responses is done for
the multi-storied buildings with infill as equivalent diagonal strut using linear and non-linear analysis. ETABS software is used
for the present study.
This document analyzes the behavior of 20-story reinforced concrete I-shaped buildings located in different seismic zones, considering the effects of plan dimensions, seismic zone, and infill walls. It is observed that maximum story drift occurs in Zone V. The presence of infill walls reduces story drifts. Both design ultimate positive and negative moments in transfer girders and main beams decrease when infill wall effects are included. The response spectrum method predicts lower maximum story drift than the equivalent lateral force method in most cases.
IRJET- Seismic Analysis of Regular and Irregular Buildings Having Fixed Base ...IRJET Journal
This document presents a seismic analysis of regular and irregular reinforced concrete buildings with both fixed bases and base isolators using time history analysis. The study models a 9-story building in regular, L-shaped, and T-shaped configurations with both fixed bases and base isolating units. Time history analyses are conducted using ground motion data from the 1995 Kozani and 1997 Jiashi earthquakes. Results for story displacements, moments, and axial forces are compared between the different building configurations and foundation types. In general, the analyses show that base isolating buildings experience lower seismic demands than identical buildings with fixed bases. Irregular buildings have higher displacements and forces than the regular building.
IRJET- Non-Linear Time History Analysis of the Horizontal and Vertical Asymme...IRJET Journal
This document discusses non-linear time history analysis of asymmetric buildings with horizontal and vertical irregularities. It summarizes that vertically geometrically irregular buildings experience the highest base torsion under seismic loading, while torsionally irregular buildings experience the highest among horizontally irregular structures. The analysis is performed using ETABS software on various irregularity models of 5-story buildings subjected to ground motion records.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Over the past decades, earthquake resistant design of building structures has been largely based on ductility design concept worldwide. The performance of the intended ductile structures during major earthquakes (e.g. Northridge, 1994; Kobe, 1995; Chi-Chi, 1999…etc) however have proven to be unsatisfactory and indeed far below expectation. So, performance based seismic design philosophies in seismic design has become the cardinal point of interest in civil engineering structures Due to the vulnerability of Bangladesh to earthquake, dynamic analysis should be introduced in major earthquake zone to ensure the seismic performance. To see the dynamic behavior of the structure, dynamic analysis should be performed for building with varying height. Dynamic analysis can take the form of a dynamic time history analysis or a linear response spectrum analysis. In this present study, a building of 15 stories with varying floor height has been modeled using software packages SAP2000 v15 for seismic zone of Bangladesh. Dynamic response of building under actual earthquakes, chi-chi, Taiwan, 1999, El centro and Northridge have been investigated. This paper highlights the effect of varying height in high-rise building with Time History Analysis.
This document summarizes research comparing the effects of complex urban geometries versus simplified representations in mesoscale modeling. It tests the hypothesis that cities can be accurately modeled as regular arrays of cubes or canopies. The document describes simulations of drag forces, shortwave radiation exchange, and wind flow for a real urban geometry compared to simplified representations of long canopies and cubes while keeping total built volume equal. Results show differences in drag, radiation absorption on walls and ground, and velocity fields between the real and simplified geometries.
IRJET- Evaluation of R.C. Multi-Storey Building Response under the Effect of ...IRJET Journal
This document evaluates the response of a 12-story reinforced concrete building with and without considering soil-structure interaction (SSI). The building is modeled in ETABS and its raft foundation is modeled in SAFE. Results show that accounting for SSI (modeling the building on flexible soil springs) increases story drift ratios, displacements, and bending moments compared to fixed-base modeling. SSI has an unfavorable effect and should be considered in seismic design for more accurate response evaluation.
This document examines the influence of plan irregularity on the seismic response of 10-story reinforced concrete buildings through static and dynamic analysis. Three building plans are considered - rectangular, C-shaped, and L-shaped. The buildings are modeled in SAP 2000 software and subjected to static, response spectrum, and time history analysis using records from three Indian earthquakes. Results show the L-shaped building experiences higher story shear and deflections compared to the other shapes. Time history analysis provides more realistic results than static or response spectrum analysis by applying actual earthquake accelerations. Plan irregularity influences seismic response, with more irregular shapes experiencing greater forces and deformations.
Effects of P-Delta on High Rise Buildings Located in Seismic ZonesIRJET Journal
The document analyzes the effects of P-Delta (the change in a structure's response due to the interaction between lateral/gravitational loads and deformations) on high-rise buildings in seismic zones. It models buildings with 10, 20, 30, and 40 stories in ETABS to analyze drift ratios, displacements, and member forces both with and without considering P-Delta effects. The results show increased drift ratios and displacements in the upper stories when P-Delta is considered. P-Delta effects become more significant with increasing building height and axial loads. The document recommends considering P-Delta effects in the analysis and design of buildings over 25 stories tall.
Study on Effects of P-Delta Analysis on RC StructuresIRJET Journal
This study examines the effects of P-delta analysis on reinforced concrete (RC) structures. Six building models of varying heights (5, 10, 15, 20, 25, and 30 stories) were analyzed with and without considering P-delta effects. P-delta effects refer to additional overturning moments generated in a structure due to the product of a structure's lateral displacement and gravity loads. The study found that considering P-delta effects led to increased story displacements, story drifts, and fundamental periods across all building heights compared to analyses that did not consider P-delta effects. Increases in story displacements and drifts were more significant for taller buildings and models in higher seismic zones. Accounting for P-delta
Comparative Analysis of Steel Telecommunication Tower Subjected to Seismic & ...civej
This document summarizes a study that analyzed steel telecommunication towers subjected to wind and seismic loads. Different tower heights (25m, 35m, and 45m) and bracing configurations were modeled and analyzed. Wind loads using the gust factor method and seismic loads using modal and response spectrum analyses were applied for various wind zones and seismic zones in India. The results of displacements at the tower tops and stresses in the bottom legs were compared. Braced towers had higher stresses in the bottom leg than unbraced towers. Taller towers experienced greater displacements, especially from 40m to 50m heights. This analysis provides insights into how wind and seismic forces impact tower structures of varying heights and bracing designs.
Comparative Analysis of Design Parameters for Multistoried Framed Structure u...paperpublications3
Abstract: In present study, Multistoried Framed Structure has been analyzed for different parameters of seismic forces and results so obtained have been compared to understand the effect of seismic forces under static and dynamic analysis. The variousdesign parameters such as beam moments, and storey drift have been evaluated for both static and dynamic analysis.
In this work Multistory Rigid Jointed Steel Framed Regular Building Modal has been analyzed by static, dynamic and pushover procedures. The post processing results obtained are compared to get some important concluding remarks. This study will emphasize on the requirement of non-linear analysis procedures with the existing linear analysis procedures provided by various codal provisions. Present study will help in evaluating the difference in various parameters during elastic (conventional) and inelastic (pushover) analysis.
IRJET- Reliability Analysis of High Rise BuildingIRJET Journal
This document analyzes the reliability of a 16-story building constructed with either concrete or expanded polystyrene (EPS) panels through modeling in ETABS software. Dynamic and wind analyses were performed to compare base shear, drift, and displacement between the materials. Results showed that using EPS reduced top displacement and inter-story drift by 40-50% compared to concrete, indicating EPS provides greater stability and meets reliability requirements for high-rise buildings.
Comparative Study of Various Seismic Analysis Methods for Rc StructureIJERA Editor
A large number of RC frame buildings have been built in India in recent years. Huge number of similarly designed and constructed buildings exist in the various towns and cities situated in moderate to severe seismic zones of the country. Analysis and design of such buildings for static forces is a routine affair these days because of availability of affordable computers and specialized programs which can be used for the analysis. On the other hand, dynamic analysis is a time consuming process and requires additional input related to mass of the structure, and an understanding of structural dynamics for interpretation of analytical results. Reinforced Concrete (RC) frame buildings are most common type of constructions in urban India, which are subjected to several types of forces during their lifetime, such as static forces due to dead and live loads and dynamic forces due to earthquake. To ensure safety against seismic forces of multi-storied building hence, there is need to study of seismic analysis to design earthquake resistance structures. In the present study a multi-storied framed structure is selected, And Linear seismic analysis is done for the building by static method (Equivalent Static Method) and dynamic method (Response Spectrum Method & Time history Method) using ETAB2016 as per the IS-1893-2002-Part-1. As a result, the response of structure has been obtained for considered building models, based on each methods of analysis, and then the results are compared with each other.
Numerical simulation of laterally loaded pileDr. Naveen BP
This document presents a finite element model simulation of a lateral load test on a 1m diameter bored pile embedded in residual soils. The pile and soil were modeled in PLAXIS 2D, with the soil represented by a Mohr-Coulomb model and the pile as a beam element. The model results showed good agreement with load-displacement curves from the field test. However, the field test was unable to apply loads high enough to reach design code displacement limits due to limitations of test equipment for large piles in residual soils. The numerical model can simulate larger displacements to evaluate pile behavior under higher loads.
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ISEISMIC PERFORMANCE OF RC FRAMED BUILDINGS UNDER LINEAR DYNAMIC ANALYSISjcie...IAEME Publication
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Comparative Study of Static and Dynamic Seismic Analysis of Multistoried RCC Buildings by ETAB
1. Gauri G. Kakpure. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -5) May 2017, pp.06-10
www.ijera.com DOI: 10.9790/9622-0705050610 6 | P a g e
Comparative Study of Static and Dynamic Seismic Analysis of
Multistoried RCC Buildings by ETAB
Gauri G. Kakpure*, Dr. A. R. Mundhada**
*PG Student, Department of Civil Engineering, P.R.M.I.T. & R., Badnera, SGBAU Amravati, India.
** Professor, Civil Department, P.R.M.I.T. & R., Badnera, Sant Gadge Baba Amravati University, India.
ABSTRACT
Reinforced Concrete (RC) building frames are most common types of constructions in urban India. These are
subjected to several types of forces during their lifetime, such as static forces due to dead and live loads and
dynamic forces due to earthquake. In the present work, two tall buildings (a G+10 and a G+25 structure),
presumed to be situated in seismic zone III, are analyzed by using two different methods viz. equivalent static
analysis method and response spectrum method, using ETAB 15 software. From analysis results, the parameters
like storey drift, storey displacement, Axial Load, Bending Moments are determined for comparative study.
Results established the superiority of the Response spectrum method over the Equivalent static analysis method.
Keywords: RCC Buildings, Equivalent Static Analysis Method, Response Spectrum Method, Story Drift
I. INTRODUCTION
A natural calamity, an earthquake has
taken toll of millions of lives through the ages,
in the unrecorded and recorded history. A disruptive
disturbance that causes shaking of the surface of
the earth due to underground movement along a
fault plane or from volcanic activity is called
earthquake. The earthquake ranks as one of the most
destructive events recorded so far in India in terms
of death toll & damage to infrastructure last hundred
years. All over the world, there is a high demand for
construction of tall buildings due to increasing
urbanization and spiraling population, and
earthquakes have the potential for causing the
greatest damage to tall structures. Since the
earthquake forces are random in nature and
unpredictable, the engineering tools need to be
sharpened for analyzing structures under the action
of these forces. Structural analysis is mainly
concerned with finding out the behavior of a
structure when subjected to some action. This action
can be in the form of load due to weight of things
such as people, furniture, wind, snow etc. or some
other kind of excitation such as earthquake, shaking
of the ground due to a blast nearby, etc. The
distinction is made between the dynamic and static
analysis on the basis of whether the applied action
has enough acceleration in comparison to the
structure's natural frequency.
In the present work, two tall buildings (a
G+10 and a G+25 structure), presumed to be situated
in seismic zone III, are analyzed using two different
methods viz. equivalent static analysis method and
response spectrum method, using ETAB 15
software.
II. METHOD OF ANALYSIS
A. Equivalent Static Analysis
Analysis against earthquake effects must
consider the dynamic nature of the load. However,
for simple & regular structures, analysis by
equivalent linear static analysis method is often
sufficient. This is permitted in most codes of
practice for regular, low- to medium-rise buildings.
B. Response Spectrum Method.
The method represents the maximum
response of an idealized single degree freedom
system having certain time period and damping,
during earthquake ground motions. The maximum
response plotted against an un-damped natural
period and for various damping values can be
expressed in terms of maximum absolute
acceleration, maximum relative velocity or
maximum relative displacement.
III. Modeling and Analysis
In the present work, two models of a G+10
and a G+25 story public building are analyzed as
special moment resisting frames. The buildings are
assumed to be situated in earthquake zone III. The
rectangular plan dimension is 20.1 x 27.6 m. Grade
of concrete used is M 30 and Grade of steel is Fe
500. Floor to floor height is taken as 3.2 m. Slab
thickness (S1) is 150 mm. External wall thickness is
taken as 230 mm. Internal wall thickness is assumed
to be 115 mm. Building is assumed to be resting on
hard soil. Density of plastered masonry wall is
assumed as 20 kN/m³. For G+10 building, Beam size
is taken as 230 x 400 mm whereas the column size is
taken as 700 x700mm at G. L. (reduced to 600x600
mm after 4 storeys & 500 x 500 mm after 8 storeys).
For G+25 building, beam size is taken as 230 x 500
RESEARCH PAPER OPEN ACCESS
2. Gauri G. Kakpure. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -5) May 2017, pp.06-10
www.ijera.com DOI: 10.9790/9622-0705050610 7 | P a g e
mm whereas the column size is taken as1000 x 1000
mm at base. After each 5th
storey, column size is
reduced by 100mm to 900 x 900 mm, 800 x 800
mm, 700 x 700 mm & finally to 600 x 600 mm
respectively.
Fig.1: Plan of building
IV. Results and Discussion
The above two RCC frame structures are
analyzed both statically and dynamically and the
results obtained are graphically shown below.
A. Comparison of Storey Drift
Fig. 2: Comparison of Storey Drift (G+10)
From Fig. 2 for x direction, it is observed
that the maximum storey drift in Response spectrum
analysis (RSx) is 21.17% less than Equivalent Static
Analysis (Ex) method. Similarly, for Y-direction it is
observed that the storey drift in Equivalent Static
Analysis (Ey) is 21.33 % more than the storey drift
in Response Spectrum Analysis (RSy).
Fig. 3: Comparison of Storey Drift (G+25)
From Fig. 3 for x direction it is observed
that the maximum storey drift in Response spectrum
analysis (RSx) is 24.12 % less than Equivalent Static
Analysis (Ex) method. Similarly, for Y-direction it is
observed that the maximum storey drift in Response
Spectrum Analysis (RSy) is 23.10% less than the
corresponding storeys drift in Equivalent Static
Analysis (Ey).
B. Comparison of Storey Displacement
Fig. 4: Comparative Storey Displacement (G+10)
From Fig. 4, for x direction, it is observed
that the maximum storey displacement in Response
spectrum analysis (RSx) is 22.74% less than
Equivalent Static Analysis (Ex) method. Similarly,
for Y-direction it is observed that the storey
displacement in Response Spectrum Analysis (RSy)
is 22.93% less than the storey displacement in
Equivalent Static Analysis (Ey).
Fig. 5: Comparative Storey Displacement (G+25)
From Fig. 5 for x direction, it is observed
that the maximum storey displacement in Response
3. Gauri G. Kakpure. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -5) May 2017, pp.06-10
www.ijera.com DOI: 10.9790/9622-0705050610 8 | P a g e
spectrum analysis (RSx) is 26.88% less than
Equivalent Static Analysis (Ex) method. Similarly,
for Y-direction it is observed that the storey
displacement in Response Spectrum Analysis (RSy)
is 25.94 % less than the storey displacement in
Equivalent Static Analysis method (Ey).
C .Comparison of axial load for Columns
From Fig. 6, it is observed that the axial
load for corner column A1 in Response spectrum
analysis (RSx) is 7% less than Equivalent Static
Analysis (Ex) method. Similarly, for Y-direction it is
observed that the axial load for column
A1inResponse Spectrum Analysis (RSy) is 8% less
than Equivalent Static Analysis value (Ey).
Fig. 6: Max axial load for corner column A1 (G+10)
From Fig. 7 below, it is observed that the
axial load for peripheral column C1 in Response
spectrum analysis (RSx) is 5% less than Equivalent
Static Analysis (Ex) method. Similarly, for Y-
direction it is observed that Peripheral column load
C1 in the Response Spectrum Analysis (RSy) is 7%
less than Equivalent static method.
Fig. 7: Max load for peripheral column C1 (G+10)
From Fig. 8 below, it is observed that the
axial load for interior column B2 in Response
spectrum analysis (RSx) is 2 % less than Equivalent
Static Analysis (Ex) method for a G+10 building.
Similarly, for Y-direction it is observed that interior
column B2 load in the Response Spectrum Analysis
(RSy) is 2% less than Equivalent Static Analysis
value (Ey) for the same building.
Fig. 8: Max load for interior column B2 (G+10)
Fig. 9: Max Load for Corner Column A1 (G+25)
From Fig. 9 above, it is observed that the
axial load for corner column A1 in Response
spectrum analysis (RSx) is 6 % less than Equivalent
Static Analysis (Ex) method for a G+25 building.
Similarly, for Y-direction it is observed that column
A1 in Response Spectrum Analysis (RSy) carries 7
% less load than Equivalent Static Analysis (Ey).
Fig. 10: Max load for peripheral column C1 (G+25)
From Fig. 10 above, it is observed that the
axial load for peripheral column C1 in Response
spectrum analysis (RSx) is 4 % less than Equivalent
Static Analysis (Ex) method. Similarly, for Y-
direction it is observed that Peripheral column load
C1 in the Response Spectrum Analysis (RSy) is 7 %
less than Equivalent Static Analysis (Ey).
4. Gauri G. Kakpure. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -5) May 2017, pp.06-10
www.ijera.com DOI: 10.9790/9622-0705050610 9 | P a g e
Fig. 11: Max load for interior column B2 (G+25)
From Fig. 11 above, it is observed that the
axial load for interior column B2 is approximately
same in Response spectrum analysis (RSx) and
Equivalent Static Analysis (Ex) method. Similarly,
for Y-direction it is observed that interior column
load B2 in the Response Spectrum Analysis (RSy) is
just 1% less than Equivalent Static Analysis (Ey).
D.Comparison of Beam End B. M.
Fig. 12: Max. B. M. for beam A1B1-1A2A (G+10)
From Fig. 12 above, it is observed that the
bending moment for end beam A1B1in Response
spectrum analysis (RSx) is 6 % lesser than
Equivalent Static Analysis (Ex) method. Similarly,
for Y-direction end beam 1A2A has 5% less moment
than Equivalent Static Analysis (Ex) method. From
Fig. 13 below, it is observed that the bending
moment for peripheral beam B1C1 in Response
spectrum analysis (RSx) is 5% less than Equivalent
Static Analysis (Ex) method. Similarly, for Y-
direction peripheral beam 1B2B has 6% less
moment from Response Spectrum Analysis (RSy)
than Equivalent Static Analysis (Ey) method.
Fig. 13: Max. B. M. for beam B1C1-1B2B (G+10)
Fig. 14: Max. B. M. for beam B2C2-2B3B (G+10)
From Fig. 14, it is observed that the
bending moment for internal beam B2C2 in
Response spectrum analysis (RSx) is 4% less than
Equivalent Static Analysis (Ex) method. Similarly,
for Y-direction internal beam 2B3B in Response
Spectrum Analysis (RSy) has 7% less moment than
Equivalent Static Analysis value (Ey).
From Fig. 15 below, it is observed that the
bending moment for end beam A1B1 in Response
spectrum analysis (RSx) is 3% less than Equivalent
Static Analysis (Ex) method for a G+25 building.
Similarly, For Y-direction end beam 1A2A, B. M. in
Response Spectrum Analysis (RSy) is 3% less than
Equivalent Static Analysis (Ey), for the same
building.
Fig. 15: Max. B. M. for beam A1B1-1A2A (G+25)
Fig. 16: Max. B. M. for beam B1C1-1B2B (G+25)
From Fig 16 above, it is observed that the
bending moment for peripheral beam B1C1 in
Response spectrum analysis (RSx) is 4% less than
Equivalent Static Analysis (Ex) method in case of a
G+25 building. Similarly, For Y-direction
5. Gauri G. Kakpure. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -5) May 2017, pp.06-10
www.ijera.com DOI: 10.9790/9622-0705050610 10 | P a g e
peripheral beam 1B2B, B. M. in Response Spectrum
Analysis (RSy) is 3% less than the corresponding
Equivalent Static Analysis value (Ey).
Fig. 17: Max. B. M. for beam B2C2-2B3B (G+25)
From Fig17 above, it is observed that the
bending moment for internal beam B2C2 in
Response spectrum analysis (RSx) is 3% less than
Equivalent Static Analysis (Ex) method for a G+25
building. Similarly For Y-direction, B. M. for
internal beam 2B3B in Response Spectrum Analysis
(RSy) is 3% less than Equivalent Static Analysis
(Ey) value.
V. CONCLUSION
i. Storey drift value for G+10 and G+25 are
22 to 25% less respectively, in dynamic
analysis than static analysis. All the values
are within the limits as per code
requirement.
ii. As the height of storey increases, the
displacement values too gradually increase.
Top storey has maximum displacement
value in both X-Y directions. For dynamic
analysis, storey displacement for G+10 and
G+25 buildings are 22 % & 26% less than
the corresponding values in static analysis.
iii. Axial load for corner column and peripheral
columns in G+10 and G+25 are 7% to 8%
less in dynamic analysis than static
analysis. However, axial load for interior
column in G+10 and G+25 are only @2%
less in dynamic analysis than static analysis
iv. Bending Moment for beams in G+10
building is 3% to7 % lesser than its static
analysis counterpart. However, in G+25
building the difference is even lesser at 3%
to 4% in dynamic analysis than static
analysis
v. Dynamic analysis gives lesser values for all
parameters than static analysis. Hence,
dynamic analysis is economical.
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