The recent history of earthquakes have indicated that if the structures are not properly designed and constructed with required quality may cause great damage to structures. This fact has resulted in to ensure safety against earthquake forces of tall structures hence, there is need to determine seismic responses of such building for designing earthquake resistant structures by carrying seismic analysis of structure. In the present work dynamic analysis of G+12 RC multi-storied framed building considering for Koyna and Bhuj earthquake is carried out by response spectrum analysis and time history analysis and responses of such building are comparatively studied with the help of SAP2000 software. Two time histories (i.e. koyna and Bhuj) have been used to develop different acceptable criteria (base shear, storey displacement, storey drift). From the results it is recommended that time history analysis should be performed as it predicts the structural response more accurately than the response spectrum analysis. Pushover Analysis is also performed for the same building and from results it is found that building is seismically safe.
IRJET- Comparative Study on Conventional Slab and Flat Slabs RCC Structure us...IRJET Journal
This document discusses a comparative study on the seismic performance of conventional slab reinforced concrete (RCC) structures and flat slab RCC structures using pushover analysis. It aims to compare the structures' behavior under parameters like base shear, story displacement, and story drift. The study finds that under equivalent pushover analysis, the conventional slab RCC structure performs better with lower base shear, story drift, and story displacement values compared to flat slab and flat plate RCC structures. Overall, the conventional slab structure is considered more seismically efficient. The document provides background on pushover analysis methodology and outlines the objectives to explore and compare the seismic behavior of different slab RCC structures through nonlinear static analysis.
Influence of Openings and Local Soil Conditions on the Seismic Behavior of Tu...IRJET Journal
The document analyzes the seismic behavior of tunnel form buildings using response spectrum analysis. Tunnel form buildings are reinforced concrete structures with relatively thin shear walls and flat slabs instead of beams and columns. The study models a 6-story RC wall building to analyze the effects of openings (0%, 6%, 22%, 50%) and soil conditions (bearing capacities of 50, 100, 200, 250) on seismic performance parameters like time period, displacement, drift, and base shear. Response spectrum analysis is performed using ETABS software according to Indian codes. Results show that RC wall buildings have significantly reduced time periods and displacements compared to equivalent RC frame buildings, indicating improved seismic performance.
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.
IRJET- Effect of Infill Wall Stiffness Variations on the Behaviour of RC ...IRJET Journal
This document summarizes a study on the effect of infill wall stiffness variations on the behavior of reinforced concrete buildings under seismic demands. The study models a 5-story reinforced concrete building located in seismic zone III of Nasik City, India, with and without considering the stiffness of infill walls. Static analysis using the equivalent lateral force method and dynamic analysis using the response spectrum method are performed and results such as base shear, fundamental time period, and story shear are compared. The goal is to better understand how accounting for the stiffness of infill walls affects the performance of reinforced concrete buildings during earthquakes.
IRJET- Seismic Analysis and Comparative Study of Regular and Irregular Bu...IRJET Journal
This document discusses seismic analysis of regular and irregular buildings using ETABS software. A 15-story reinforced concrete building model was generated for both regular and irregular configurations. Mass and stiffness distribution influence how multi-story buildings respond during earthquakes. Irregularities can cause damage as seen in the 2001 Bhuj earthquake in India. The objective is to conduct dynamic analysis of regular and irregular frames and compare results. Analysis considers factors like storey deflection, storey shear, and stiffness. Previous studies found plan configuration and symmetry affect seismic response, with irregular structures experiencing greater damage.
Evaluation of Response Reduction Factor for Moment Resisting Steel Frames- A ...IRJET Journal
This document reviews the evaluation of response reduction factors for steel moment resisting frames through non-linear modeling and analysis. It begins with an abstract that outlines the objectives and methodology of using non-linear static analysis in SAP2000 to evaluate response reduction factors and compare them to code requirements considering different seismic zones and ground motions. It then provides background on moment resisting frames and the concept of response reduction factors. The document describes the non-linear modeling and pushover analysis methodology used. It also reviews previous literature on evaluating response reduction factors for steel frames and the factors that influence the values, such as number of stories, bracing type, and boundary conditions.
IRJET- A Review on Comparative Studies on Seismic Analysis of Multi-Story...IRJET Journal
This document summarizes and compares seismic analysis of multi-story buildings using IS 1893:2002 and IS 1893:2016, the Indian seismic codes. It reviews several studies that analyzed multi-story reinforced concrete buildings using both codes. The studies found that IS 1893:2016 provides more conservative seismic design values, such as higher design seismic forces and increased story drift. IS 1893:2016 also considers cracked concrete sections while IS 1893:2002 considers full sections. Overall, IS 1893:2016 represents significant improvements in seismic analysis and is considered more stringent than the previous 2002 version.
IRJET- Comparative Study on Conventional Slab and Flat Slabs RCC Structure us...IRJET Journal
This document discusses a comparative study on the seismic performance of conventional slab reinforced concrete (RCC) structures and flat slab RCC structures using pushover analysis. It aims to compare the structures' behavior under parameters like base shear, story displacement, and story drift. The study finds that under equivalent pushover analysis, the conventional slab RCC structure performs better with lower base shear, story drift, and story displacement values compared to flat slab and flat plate RCC structures. Overall, the conventional slab structure is considered more seismically efficient. The document provides background on pushover analysis methodology and outlines the objectives to explore and compare the seismic behavior of different slab RCC structures through nonlinear static analysis.
Influence of Openings and Local Soil Conditions on the Seismic Behavior of Tu...IRJET Journal
The document analyzes the seismic behavior of tunnel form buildings using response spectrum analysis. Tunnel form buildings are reinforced concrete structures with relatively thin shear walls and flat slabs instead of beams and columns. The study models a 6-story RC wall building to analyze the effects of openings (0%, 6%, 22%, 50%) and soil conditions (bearing capacities of 50, 100, 200, 250) on seismic performance parameters like time period, displacement, drift, and base shear. Response spectrum analysis is performed using ETABS software according to Indian codes. Results show that RC wall buildings have significantly reduced time periods and displacements compared to equivalent RC frame buildings, indicating improved seismic performance.
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.
IRJET- Effect of Infill Wall Stiffness Variations on the Behaviour of RC ...IRJET Journal
This document summarizes a study on the effect of infill wall stiffness variations on the behavior of reinforced concrete buildings under seismic demands. The study models a 5-story reinforced concrete building located in seismic zone III of Nasik City, India, with and without considering the stiffness of infill walls. Static analysis using the equivalent lateral force method and dynamic analysis using the response spectrum method are performed and results such as base shear, fundamental time period, and story shear are compared. The goal is to better understand how accounting for the stiffness of infill walls affects the performance of reinforced concrete buildings during earthquakes.
IRJET- Seismic Analysis and Comparative Study of Regular and Irregular Bu...IRJET Journal
This document discusses seismic analysis of regular and irregular buildings using ETABS software. A 15-story reinforced concrete building model was generated for both regular and irregular configurations. Mass and stiffness distribution influence how multi-story buildings respond during earthquakes. Irregularities can cause damage as seen in the 2001 Bhuj earthquake in India. The objective is to conduct dynamic analysis of regular and irregular frames and compare results. Analysis considers factors like storey deflection, storey shear, and stiffness. Previous studies found plan configuration and symmetry affect seismic response, with irregular structures experiencing greater damage.
Evaluation of Response Reduction Factor for Moment Resisting Steel Frames- A ...IRJET Journal
This document reviews the evaluation of response reduction factors for steel moment resisting frames through non-linear modeling and analysis. It begins with an abstract that outlines the objectives and methodology of using non-linear static analysis in SAP2000 to evaluate response reduction factors and compare them to code requirements considering different seismic zones and ground motions. It then provides background on moment resisting frames and the concept of response reduction factors. The document describes the non-linear modeling and pushover analysis methodology used. It also reviews previous literature on evaluating response reduction factors for steel frames and the factors that influence the values, such as number of stories, bracing type, and boundary conditions.
IRJET- A Review on Comparative Studies on Seismic Analysis of Multi-Story...IRJET Journal
This document summarizes and compares seismic analysis of multi-story buildings using IS 1893:2002 and IS 1893:2016, the Indian seismic codes. It reviews several studies that analyzed multi-story reinforced concrete buildings using both codes. The studies found that IS 1893:2016 provides more conservative seismic design values, such as higher design seismic forces and increased story drift. IS 1893:2016 also considers cracked concrete sections while IS 1893:2002 considers full sections. Overall, IS 1893:2016 represents significant improvements in seismic analysis and is considered more stringent than the previous 2002 version.
Static Analysis of G+2 Institutional Building in BhopalIJERA Editor
A Seismic design is aimed at controlling the structural damage based on precise estimations of proper response
parameters. Seismic design explicitly evaluates how a building is likely to perform; given the potential hazard it
is likely to experience, considering uncertainties inherent in the quantification of potential hazard and
uncertainties in assessment of the actual building response. It is an interactive process that begins with the
selection of performance objectives, followed by the development of a preliminary design, an assessment as to
whether or not the design meets the performance objectives, and finally redesign and reassessment, if required,
until the desired performance level is achieved.
In this present study one R.C. buildings, of G + 2 storey institutional building (designed according to IS
456:2000) are analysed. Analysis and redesigning by changing the main reinforcement of various frame
elements and again analyzing. The structural analysis has been carried out using STAAD.Pro V8i, a product of
Structural Analysis and Design Program. A total of 1 cases for a particular G + 2 storey institutional building
located in Zone-II have been analyzed. The results of analysis are compared in terms of reinforcement in the
column and beam. The best possible combination of reinforcement that is economical, effective and whose
damage is limited to Grade 2 (slight structural damage, moderate non structural damage) in order to enable
Immediate Occupancy is determined and is termed as Seismic Design.
IRJET-Effect of Non-Linear Soil Types on Seismic Response of Bridge Pier Supp...IRJET Journal
This document presents a study on the effect of non-linear soil types on the seismic response of bridge piers supported by well foundations. The study analyzes bridge piers of varying heights from 6m to 24m supported on well foundations using the force-based method. Soil-structure interaction is considered by modeling the soil surrounding the well foundation using springs. The response of the bridge piers is analyzed for different soil types (hard, medium, soft) and seismic zones. The objectives of the study are to analyze the top displacement, base shear, and base moment demands of the bridge piers and to study the effects of soil-structure interaction on the seismic design of bridge piers supported by well foundations.
IRJET- Review Paper on Convincement based Seismic Design of Open Ground Store...IRJET Journal
This document summarizes research on the seismic design of open ground storey framed buildings. It discusses how open ground storey buildings are vulnerable in earthquakes due to soft-storey behavior. The document reviews various studies on seismic analysis of irregular buildings using software like ETABS. It is proposed to conduct time history analysis of multi-storey reinforced concrete buildings considering mass irregularity at different floor levels to understand seismic response. The conclusion discusses how seismic analysis is important for structures and how responses can be reduced by adding shear walls or base isolation.
Seismic Performance and Shear Wall Location Assessment of a RC Building- Eva...IRJET Journal
1. The document evaluates the seismic performance of reinforced concrete buildings located on plain and sloping ground.
2. Non-linear static pushover analysis is conducted using SAP 2000 on a G+10 building model located on plain and sloping ground.
3. Results of the pushover analysis such as base shear, story displacement, story drift and story shear are compared between the plain and sloping ground models.
IRJET- Seismic Analysis of Low Rise, Mid Rise and High Rise RCC Structure on ...IRJET Journal
1. The document discusses seismic analysis of low, mid, and high-rise reinforced concrete (RCC) structures located on sloping ground. It analyzes the structures using equivalent static, response spectrum, and time history methods in ETABS software.
2. The analysis focuses on parameters like storey displacement, base shear, storey drift, time period, and modal participating factors. It aims to understand how seismic performance of RCC structures is affected by placement on sloping ground at different angles.
3. Equivalent static analysis uses a static lateral force to approximate dynamic seismic loading. Response spectrum analysis uses the structure's natural frequency and a ground response spectrum to estimate peak response. Time history analysis considers dynamic response over
Influence of Aspect Ratio & Plan Configurations on Seismic Performance of Mul...IRJET Journal
This document summarizes a study that analyzed the influence of aspect ratio and plan configurations on the seismic performance of multistory reinforced concrete buildings. Sixteen building models with varying horizontal aspect ratios (number of bays) and vertical aspect ratios (number of stories) were modeled and analyzed using response spectrum analysis to evaluate various seismic response parameters. The objective was to determine the best suitable building plan configuration and understand how increasing the height and bays impacts seismic response.
Performance Based Evaluation of Conventional RC Framed Structure Compared wit...IRJET Journal
This document analyzes the seismic performance of an 11-story conventional reinforced concrete (RC) framed structure compared to a flat slab structure. Both linear and nonlinear analysis methods are used to evaluate the structures' performance under seismic loads. The natural period, base shear, story stiffness, and story displacement are calculated and compared for RC and flat slab models with and without shear walls. The results show that the flat slab structure generally has a higher natural period, base shear, and story displacement but lower story stiffness compared to the RC structure. Shear walls are found to significantly increase the stiffness and seismic performance of both structural types.
IRJET- The Behavior of Regular and Irregualr Reinforced Concrete Buildings Un...IRJET Journal
This document discusses a study on the behavior of regular and irregular reinforced concrete buildings under varying seismic frequency contents. Three, seven, and twenty-two story regular and irregular RC buildings are modeled and subjected to seven ground motions with low, intermediate, and high frequency contents through nonlinear time history analysis. The response of each building, in terms of story displacement, velocity, acceleration, and base shear, is obtained and compared for the different ground motions. The results show that low frequency ground motions have a more significant effect on both regular and irregular RC buildings, while high frequency ground motions have little effect.
Seismic Performance Study on RC Wall StructuresIRJET Journal
This document presents a study on the seismic performance of reinforced concrete (RC) wall structures. Response spectrum analysis is performed using ETABS software to analyze models of RC wall buildings under different conditions, including variations in stiffness irregularities, door opening positions, and seismic zones. The performance is evaluated based on response spectrum base shear, storey displacements, and modal time period. The results show that providing shear walls improves seismic capacity and stiffness. Stiffness irregularities, door openings, and more severe seismic zones tend to increase base shear and displacements. RC wall buildings demonstrate less displacement than other structural systems, indicating better seismic safety.
Seismic Evaluation of Multi-storeyed Buildings On Plain Ground And Curve Slop...IJSRD
Most of the hilly regions of India are highly seismic. Buildings on hill slopes differ in a way from other buildings. The soft storeies are typical feature in modern constructions specially in seismic areas which has been experience by the previous studies and past earthquakes. Due to verious type of structures on sloped ground structures are comes under irregularity and asymmetricity. Structures on slope leads to seismic cases.The damages to the structures are determined and acceptable safety can be provided. The linear-elastic analysis is not adequate in highly seismic areas. Thus for the design of building in seimic areas and sloped areas inelastic procedure is used. In the present dissertation work, 3D analytical model of eleven storeyed buildings on plain and curved ground have been generated. Models are analyze using ‘‘ETABSâ€Âto get the behavior of structure due to change in column height in ground story due to curved sloped ground. The analytical model of the building includes all important components that influence the mass, strength, stiffness and deformability of the structure. To study the effect of infill, concrete shear wall and concrete core wall during earthquake, seismic analysis using both elastic and inelastic method of analyses i.e., linear static (equivalent static method), linear dynamic (response spectrum method) has been performed. The deflections at each storey level has been compared by performing equivalent static method, response spectrum method. Storey drifts are within the permissible limit given for linear static and linear dynamic method. Again contrary to common practice, the presence of masonry infills, concrete shear and concrete core wall may affect the overall behavior of structure while subjected to earthquake forces.
IRJET- A Study on Effect of LRB Isolators on Varying Height of Rectangula...IRJET Journal
This document analyzes the effect of using lead rubber bearing (LRB) isolators on structures of varying heights when subjected to seismic activity. Non-linear time history analyses were conducted on 4, 10, 15, and 20-story rectangular reinforced concrete structures both with and without LRB isolators. The results showed that using LRB isolators significantly reduced story rotation, acceleration, displacement, and drift across all building heights compared to fixed-base structures. Additionally, LRB isolators increased the natural period of the structures, which decreased the lateral forces experienced. In conclusion, seismic isolation through the use of LRB isolators improved the performance of structures and was more effective at mitigating earthquake effects in taller buildings.
IRJET- A Review Paper on Seismic Analysis of Old Masonry Buildings using Equi...IRJET Journal
This document provides a literature review on seismic analysis of old masonry buildings using the equivalent static method. It summarizes 15 previous research papers on topics like visual assessment methods for masonry structures, analytical studies of masonry structures under seismic conditions, low-cost earthquake resistant construction methods, seismic performance analysis of heritage masonry buildings, experimental determination of mechanical properties of masonry walls, and homogenization techniques for masonry building analysis. The document aims to provide background research for analyzing the seismic performance of an old masonry palace in Bhopal, India called Chaman Mahal using the equivalent static method outlined in the Indian code IS 1893:2002.
The document summarizes a student project to assess the seismic performance of a reinforced concrete building through nonlinear analysis. The students modeled the building in structural analysis software, performed linear and nonlinear analysis, determined the structure did not meet seismic code requirements, redesigned it with thicker shear walls and beams, and confirmed the redesign met code through additional nonlinear analysis.
IRJET- Comparative Study on Seismic and Wind Performance of Multi-Storeyed Bu...IRJET Journal
This document provides a literature review on the comparative study of seismic and wind performance of multi-storey buildings with plan and vertical irregularities. Several previous studies are summarized that analyzed regular and irregular structures using software like ETABS. The studies found that irregular structures experienced higher displacements and drifts compared to regular structures under lateral loads. Parameters like base shear, story drift, displacement, and acceleration were compared between regular and irregular configurations. In general, it was found that irregular structures are more susceptible to damage from seismic and wind loads.
PERFORMANCE BASED ANALYSIS OF VERTICALLY IRREGULAR STRUCTURE UNDER VARIOUS SE...Ijripublishers Ijri
In the recent years a lot of attention has been given to the earthquake analysis of structure it is one of the most devastating
natural calamity and which causes severe damage not only to the properties but also to the lives. This is the
reason there has been a lot of focus on the structures to be earthquake resistant. Buildings get damaged mostly due
to the earthquake ground motions. In an earthquake, the building base experiences high frequency movements, which
results in the inertial force on the building and its components and this problem gets worse when a structure is irregular
in shape, size etc,. Therefore, there is a lot to work on the seismic behavior of the irregular building which might not
respond the way regular building does. It makes the irregular building quite more complex and unpredictable during
the course of an earthquake.
IRJET- A Review on Seismic Analysis of Multistory Building for Soft GroundIRJET Journal
This document discusses seismic analysis of multistory buildings built on soft ground using time history analysis. It reviews past seismic failures of open ground story buildings and the need to analyze the seismic response of such structures. The methodology involves modeling a sample 9-story reinforced concrete building with and without infill walls at the ground level using time history analysis in software. The analysis aims to observe the effects of different support conditions and infill wall modeling on the seismic response of the open ground story structure.
Linear Dynamic Analysis and Seismic Evaluation of RC BuildingQudsia Wahab, EIT
The document summarizes linear dynamic analysis and seismic evaluation of a 10-story reinforced concrete model structure tested on a shake table in Japan. Key aspects include:
1) The structure was modeled in SAP2000 and consisted of special moment resisting frames (SMRFs) in the long direction and reinforced concrete shear walls in the short direction.
2) Response spectrum analysis was performed in SAP2000 using design spectra from the test site in Japan. The fundamental period of the structure was found to be 0.538 seconds in the short direction and 0.947 seconds in the long direction.
3) Capacities of critical members were calculated using ACI 318 and compared to demands from SAP2000 to check
This document analyzes the seismic performance of irregular L-shaped reinforced concrete buildings of varying heights (4, 8, and 20 stories) located in seismic Zone III. Six models of each building are considered: a bare frame, frame with infill walls modeled as membranes, and frame with infill walls modeled as equivalent diagonal struts. Nonlinear time history and pushover analyses are performed using ETABS. The results show that modeling infill walls improves seismic performance by reducing top story displacement and increasing base shear capacity, with the equivalent strut model performing better than the membrane model. The influence of infill walls decreases with increasing building height.
Variation of deflection of steel high rise structure due to p- delta effect c...Yousuf Dinar
This document summarizes the results of a study that analyzed the effect of P-Delta on the deflection of steel high-rise structures considering global slenderness ratio. 40 different structural models were simulated with varying numbers of stories (7, 14, 20, 30) and bay dimensions to modify the slenderness. Both P-Delta analysis and linear static analysis were performed, and deflections were compared. P-Delta analysis resulted in significantly higher deflections than linear static analysis, especially as slenderness increased with taller buildings and smaller bays. Deflections at the top of each structure and for individual stories were evaluated. Results showed increasing deflections with P-Delta analysis as slenderness rose due to building height or
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.
IRJET- Comparative Study & Seismic Anyalysis of Regular and Irregular Geometr...IRJET Journal
This study compares the seismic analysis of regular and irregular high-rise buildings in different seismic zones of India. Finite element software will be used to model and analyze a 10-story regular and irregular building subjected to different seismic zones. Results like deflections, axial forces, and moments will be compared to understand how seismic zone and building geometry affect structural response. The aim is to help improve earthquake-resistant design of high-rise buildings.
Review paper on seismic responses of multistored rcc building with mass irreg...eSAT Journals
Abstract
From past earthquakes it is proved that many of structure are totally or partially damaged due to earthquake. So, it is necessary to determine seismic responses of such buildings. There are different techniques of seismic analysis of structure. Time history analysis is one of the important techniques for structural seismic analysis generally the evaluated structural response is non-linear in nature. For such type of analysis, a representative earthquake time history is required. In this project work seismic analysis of RCC buildings with mass irregularity at different floor level are carried out. Here for analysis different time histories have been used. This paper highlights the effect of mass irregularity on different floor in RCC buildings with time history and analysis is done by using ETABS software.
Keywords: Seismic Analysis, Time History Analysis, Base Shear, Storey Shear, Story Displacement.
Static Analysis of G+2 Institutional Building in BhopalIJERA Editor
A Seismic design is aimed at controlling the structural damage based on precise estimations of proper response
parameters. Seismic design explicitly evaluates how a building is likely to perform; given the potential hazard it
is likely to experience, considering uncertainties inherent in the quantification of potential hazard and
uncertainties in assessment of the actual building response. It is an interactive process that begins with the
selection of performance objectives, followed by the development of a preliminary design, an assessment as to
whether or not the design meets the performance objectives, and finally redesign and reassessment, if required,
until the desired performance level is achieved.
In this present study one R.C. buildings, of G + 2 storey institutional building (designed according to IS
456:2000) are analysed. Analysis and redesigning by changing the main reinforcement of various frame
elements and again analyzing. The structural analysis has been carried out using STAAD.Pro V8i, a product of
Structural Analysis and Design Program. A total of 1 cases for a particular G + 2 storey institutional building
located in Zone-II have been analyzed. The results of analysis are compared in terms of reinforcement in the
column and beam. The best possible combination of reinforcement that is economical, effective and whose
damage is limited to Grade 2 (slight structural damage, moderate non structural damage) in order to enable
Immediate Occupancy is determined and is termed as Seismic Design.
IRJET-Effect of Non-Linear Soil Types on Seismic Response of Bridge Pier Supp...IRJET Journal
This document presents a study on the effect of non-linear soil types on the seismic response of bridge piers supported by well foundations. The study analyzes bridge piers of varying heights from 6m to 24m supported on well foundations using the force-based method. Soil-structure interaction is considered by modeling the soil surrounding the well foundation using springs. The response of the bridge piers is analyzed for different soil types (hard, medium, soft) and seismic zones. The objectives of the study are to analyze the top displacement, base shear, and base moment demands of the bridge piers and to study the effects of soil-structure interaction on the seismic design of bridge piers supported by well foundations.
IRJET- Review Paper on Convincement based Seismic Design of Open Ground Store...IRJET Journal
This document summarizes research on the seismic design of open ground storey framed buildings. It discusses how open ground storey buildings are vulnerable in earthquakes due to soft-storey behavior. The document reviews various studies on seismic analysis of irregular buildings using software like ETABS. It is proposed to conduct time history analysis of multi-storey reinforced concrete buildings considering mass irregularity at different floor levels to understand seismic response. The conclusion discusses how seismic analysis is important for structures and how responses can be reduced by adding shear walls or base isolation.
Seismic Performance and Shear Wall Location Assessment of a RC Building- Eva...IRJET Journal
1. The document evaluates the seismic performance of reinforced concrete buildings located on plain and sloping ground.
2. Non-linear static pushover analysis is conducted using SAP 2000 on a G+10 building model located on plain and sloping ground.
3. Results of the pushover analysis such as base shear, story displacement, story drift and story shear are compared between the plain and sloping ground models.
IRJET- Seismic Analysis of Low Rise, Mid Rise and High Rise RCC Structure on ...IRJET Journal
1. The document discusses seismic analysis of low, mid, and high-rise reinforced concrete (RCC) structures located on sloping ground. It analyzes the structures using equivalent static, response spectrum, and time history methods in ETABS software.
2. The analysis focuses on parameters like storey displacement, base shear, storey drift, time period, and modal participating factors. It aims to understand how seismic performance of RCC structures is affected by placement on sloping ground at different angles.
3. Equivalent static analysis uses a static lateral force to approximate dynamic seismic loading. Response spectrum analysis uses the structure's natural frequency and a ground response spectrum to estimate peak response. Time history analysis considers dynamic response over
Influence of Aspect Ratio & Plan Configurations on Seismic Performance of Mul...IRJET Journal
This document summarizes a study that analyzed the influence of aspect ratio and plan configurations on the seismic performance of multistory reinforced concrete buildings. Sixteen building models with varying horizontal aspect ratios (number of bays) and vertical aspect ratios (number of stories) were modeled and analyzed using response spectrum analysis to evaluate various seismic response parameters. The objective was to determine the best suitable building plan configuration and understand how increasing the height and bays impacts seismic response.
Performance Based Evaluation of Conventional RC Framed Structure Compared wit...IRJET Journal
This document analyzes the seismic performance of an 11-story conventional reinforced concrete (RC) framed structure compared to a flat slab structure. Both linear and nonlinear analysis methods are used to evaluate the structures' performance under seismic loads. The natural period, base shear, story stiffness, and story displacement are calculated and compared for RC and flat slab models with and without shear walls. The results show that the flat slab structure generally has a higher natural period, base shear, and story displacement but lower story stiffness compared to the RC structure. Shear walls are found to significantly increase the stiffness and seismic performance of both structural types.
IRJET- The Behavior of Regular and Irregualr Reinforced Concrete Buildings Un...IRJET Journal
This document discusses a study on the behavior of regular and irregular reinforced concrete buildings under varying seismic frequency contents. Three, seven, and twenty-two story regular and irregular RC buildings are modeled and subjected to seven ground motions with low, intermediate, and high frequency contents through nonlinear time history analysis. The response of each building, in terms of story displacement, velocity, acceleration, and base shear, is obtained and compared for the different ground motions. The results show that low frequency ground motions have a more significant effect on both regular and irregular RC buildings, while high frequency ground motions have little effect.
Seismic Performance Study on RC Wall StructuresIRJET Journal
This document presents a study on the seismic performance of reinforced concrete (RC) wall structures. Response spectrum analysis is performed using ETABS software to analyze models of RC wall buildings under different conditions, including variations in stiffness irregularities, door opening positions, and seismic zones. The performance is evaluated based on response spectrum base shear, storey displacements, and modal time period. The results show that providing shear walls improves seismic capacity and stiffness. Stiffness irregularities, door openings, and more severe seismic zones tend to increase base shear and displacements. RC wall buildings demonstrate less displacement than other structural systems, indicating better seismic safety.
Seismic Evaluation of Multi-storeyed Buildings On Plain Ground And Curve Slop...IJSRD
Most of the hilly regions of India are highly seismic. Buildings on hill slopes differ in a way from other buildings. The soft storeies are typical feature in modern constructions specially in seismic areas which has been experience by the previous studies and past earthquakes. Due to verious type of structures on sloped ground structures are comes under irregularity and asymmetricity. Structures on slope leads to seismic cases.The damages to the structures are determined and acceptable safety can be provided. The linear-elastic analysis is not adequate in highly seismic areas. Thus for the design of building in seimic areas and sloped areas inelastic procedure is used. In the present dissertation work, 3D analytical model of eleven storeyed buildings on plain and curved ground have been generated. Models are analyze using ‘‘ETABSâ€Âto get the behavior of structure due to change in column height in ground story due to curved sloped ground. The analytical model of the building includes all important components that influence the mass, strength, stiffness and deformability of the structure. To study the effect of infill, concrete shear wall and concrete core wall during earthquake, seismic analysis using both elastic and inelastic method of analyses i.e., linear static (equivalent static method), linear dynamic (response spectrum method) has been performed. The deflections at each storey level has been compared by performing equivalent static method, response spectrum method. Storey drifts are within the permissible limit given for linear static and linear dynamic method. Again contrary to common practice, the presence of masonry infills, concrete shear and concrete core wall may affect the overall behavior of structure while subjected to earthquake forces.
IRJET- A Study on Effect of LRB Isolators on Varying Height of Rectangula...IRJET Journal
This document analyzes the effect of using lead rubber bearing (LRB) isolators on structures of varying heights when subjected to seismic activity. Non-linear time history analyses were conducted on 4, 10, 15, and 20-story rectangular reinforced concrete structures both with and without LRB isolators. The results showed that using LRB isolators significantly reduced story rotation, acceleration, displacement, and drift across all building heights compared to fixed-base structures. Additionally, LRB isolators increased the natural period of the structures, which decreased the lateral forces experienced. In conclusion, seismic isolation through the use of LRB isolators improved the performance of structures and was more effective at mitigating earthquake effects in taller buildings.
IRJET- A Review Paper on Seismic Analysis of Old Masonry Buildings using Equi...IRJET Journal
This document provides a literature review on seismic analysis of old masonry buildings using the equivalent static method. It summarizes 15 previous research papers on topics like visual assessment methods for masonry structures, analytical studies of masonry structures under seismic conditions, low-cost earthquake resistant construction methods, seismic performance analysis of heritage masonry buildings, experimental determination of mechanical properties of masonry walls, and homogenization techniques for masonry building analysis. The document aims to provide background research for analyzing the seismic performance of an old masonry palace in Bhopal, India called Chaman Mahal using the equivalent static method outlined in the Indian code IS 1893:2002.
The document summarizes a student project to assess the seismic performance of a reinforced concrete building through nonlinear analysis. The students modeled the building in structural analysis software, performed linear and nonlinear analysis, determined the structure did not meet seismic code requirements, redesigned it with thicker shear walls and beams, and confirmed the redesign met code through additional nonlinear analysis.
IRJET- Comparative Study on Seismic and Wind Performance of Multi-Storeyed Bu...IRJET Journal
This document provides a literature review on the comparative study of seismic and wind performance of multi-storey buildings with plan and vertical irregularities. Several previous studies are summarized that analyzed regular and irregular structures using software like ETABS. The studies found that irregular structures experienced higher displacements and drifts compared to regular structures under lateral loads. Parameters like base shear, story drift, displacement, and acceleration were compared between regular and irregular configurations. In general, it was found that irregular structures are more susceptible to damage from seismic and wind loads.
PERFORMANCE BASED ANALYSIS OF VERTICALLY IRREGULAR STRUCTURE UNDER VARIOUS SE...Ijripublishers Ijri
In the recent years a lot of attention has been given to the earthquake analysis of structure it is one of the most devastating
natural calamity and which causes severe damage not only to the properties but also to the lives. This is the
reason there has been a lot of focus on the structures to be earthquake resistant. Buildings get damaged mostly due
to the earthquake ground motions. In an earthquake, the building base experiences high frequency movements, which
results in the inertial force on the building and its components and this problem gets worse when a structure is irregular
in shape, size etc,. Therefore, there is a lot to work on the seismic behavior of the irregular building which might not
respond the way regular building does. It makes the irregular building quite more complex and unpredictable during
the course of an earthquake.
IRJET- A Review on Seismic Analysis of Multistory Building for Soft GroundIRJET Journal
This document discusses seismic analysis of multistory buildings built on soft ground using time history analysis. It reviews past seismic failures of open ground story buildings and the need to analyze the seismic response of such structures. The methodology involves modeling a sample 9-story reinforced concrete building with and without infill walls at the ground level using time history analysis in software. The analysis aims to observe the effects of different support conditions and infill wall modeling on the seismic response of the open ground story structure.
Linear Dynamic Analysis and Seismic Evaluation of RC BuildingQudsia Wahab, EIT
The document summarizes linear dynamic analysis and seismic evaluation of a 10-story reinforced concrete model structure tested on a shake table in Japan. Key aspects include:
1) The structure was modeled in SAP2000 and consisted of special moment resisting frames (SMRFs) in the long direction and reinforced concrete shear walls in the short direction.
2) Response spectrum analysis was performed in SAP2000 using design spectra from the test site in Japan. The fundamental period of the structure was found to be 0.538 seconds in the short direction and 0.947 seconds in the long direction.
3) Capacities of critical members were calculated using ACI 318 and compared to demands from SAP2000 to check
This document analyzes the seismic performance of irregular L-shaped reinforced concrete buildings of varying heights (4, 8, and 20 stories) located in seismic Zone III. Six models of each building are considered: a bare frame, frame with infill walls modeled as membranes, and frame with infill walls modeled as equivalent diagonal struts. Nonlinear time history and pushover analyses are performed using ETABS. The results show that modeling infill walls improves seismic performance by reducing top story displacement and increasing base shear capacity, with the equivalent strut model performing better than the membrane model. The influence of infill walls decreases with increasing building height.
Variation of deflection of steel high rise structure due to p- delta effect c...Yousuf Dinar
This document summarizes the results of a study that analyzed the effect of P-Delta on the deflection of steel high-rise structures considering global slenderness ratio. 40 different structural models were simulated with varying numbers of stories (7, 14, 20, 30) and bay dimensions to modify the slenderness. Both P-Delta analysis and linear static analysis were performed, and deflections were compared. P-Delta analysis resulted in significantly higher deflections than linear static analysis, especially as slenderness increased with taller buildings and smaller bays. Deflections at the top of each structure and for individual stories were evaluated. Results showed increasing deflections with P-Delta analysis as slenderness rose due to building height or
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.
IRJET- Comparative Study & Seismic Anyalysis of Regular and Irregular Geometr...IRJET Journal
This study compares the seismic analysis of regular and irregular high-rise buildings in different seismic zones of India. Finite element software will be used to model and analyze a 10-story regular and irregular building subjected to different seismic zones. Results like deflections, axial forces, and moments will be compared to understand how seismic zone and building geometry affect structural response. The aim is to help improve earthquake-resistant design of high-rise buildings.
Review paper on seismic responses of multistored rcc building with mass irreg...eSAT Journals
Abstract
From past earthquakes it is proved that many of structure are totally or partially damaged due to earthquake. So, it is necessary to determine seismic responses of such buildings. There are different techniques of seismic analysis of structure. Time history analysis is one of the important techniques for structural seismic analysis generally the evaluated structural response is non-linear in nature. For such type of analysis, a representative earthquake time history is required. In this project work seismic analysis of RCC buildings with mass irregularity at different floor level are carried out. Here for analysis different time histories have been used. This paper highlights the effect of mass irregularity on different floor in RCC buildings with time history and analysis is done by using ETABS software.
Keywords: Seismic Analysis, Time History Analysis, Base Shear, Storey Shear, Story Displacement.
IRJET- Study of Literature on Seismic Response of RC Irregular StructureIRJET Journal
The document discusses vertical irregularities in reinforced concrete (RC) buildings and their effects on seismic response. It first defines vertical irregularities as weaknesses caused by discontinuities in mass, stiffness, or geometry between storeys. Soft stories, where the stiffness suddenly decreases, are one type of vertical irregularity. The document then reviews several previous studies on modeling and analyzing vertically irregular buildings using pushover analysis, which incrementally loads a structure to determine its failure mechanisms. The studies found that soft story buildings absorb energy through overturning and shear deformation. Irregular buildings may have similar seismic performance to regular buildings if properly designed. Quantifying the degree of irregularity can help evaluate seismic vulnerability and retrofitting needs.
SEISMIC RESPONSE OF EXISTING RC BUILDING UNDER REVISED SEISMIC ZONE CLASSIFIC...IAEME Publication
This document summarizes a research paper that analyzes an existing 7-story reinforced concrete building using pushover analysis under old and revised seismic zone classifications. The building was originally designed according to older seismic code provisions. Pushover analysis was conducted in both directions to obtain capacity curves and identify plastic hinge locations. The results show the building can withstand seismic forces with some yielding, providing insight into its real behavior. Comparing demand and capacity points indicates the building's expected performance under different seismic codes.
DESIGN AND ANALYSIS OF MULTI STORIED STRUCTURES USING STATIC NON LINEAR ANALYSISIjripublishers Ijri
In plan during the seismic excitation using nonlinear static analysis (pushover) have been performed on the
same structure. The literature pertaining to pushover analysis is reviewed. The pushover analysis adopted
in the present study is on similar lines with the procedure presented by Ashraf Habibullah and Stephen
Pyle using ETABS V 9.7 structural analysis software. The effect of earthquake force in a idealized G+4 story
building under maximum earthquake zone, with the help of pushover analysis has been investigated and
the results were compared in terms of base shear, displacement, spectral acceleration, spectral displacement
and effective damping and effective time period .to strengthen the symmetric and un symmetric RCC
framed buildings` steel braces are included by using retrofitting method.
A Review on Comparative Analysis of Multistorey Buildings Under Various India...IRJET Journal
This document summarizes and compares the findings of 5 research papers on seismic analysis of multi-storey buildings under various conditions in India. Key findings include:
1) Buildings perform better in lower seismic zones with lower base shear, displacement and drift. Irregular buildings need more design consideration.
2) Diaphragm discontinuity like openings significantly impact load transfer and response to seismic forces.
3) Building shape/configuration affects its ability to withstand seismic forces. Structures like shear walls improve seismic performance.
4) As seismic zones increase, designs require more steel reinforcement, especially in beams, to resist higher seismic forces.
The studies provide valuable insights on building practices and seismic vulnerability based
A Review on Earthquake Vulnerability AssessmentIRJET Journal
This document provides a review of earthquake vulnerability assessment. It discusses fragility curves, which show the probability of exceeding certain damage levels as a function of ground motion intensity. Fragility curves are developed using incremental dynamic analysis (IDA), which involves performing nonlinear time history analyses while gradually increasing ground motion intensities. IDA provides structural response over a range of intensities from elastic to collapse. The document also reviews several studies on developing fragility curves for buildings using IDA and analyzing the seismic performance of base isolated structures through experimental testing.
IRJET- Seismic Analysis of Buildings with Shear Wall having Horizontal Ir...IRJET Journal
This document analyzes the seismic behavior of five 6-story buildings with horizontal irregularities: E-shaped, I-shaped, L-shaped, +-shaped, and box-shaped. The buildings are modeled in SAP2000 and analyzed using response spectrum analysis according to Indian codes for seismic design. Parameters like lateral displacement, base shear, story drift, and period are compared. Results show the E-shaped building experiences the highest base shear and lateral displacement, while the +-shaped building experiences the lowest. The L-shaped building has the highest displacement in the X-direction, while the +-shaped building remains the lowest. In conclusion, horizontal irregularity affects the seismic response of buildings.
Performance based seismic design of the multi-storied reinforced concrete bui...IRJET Journal
The document discusses performance-based seismic design of multi-story reinforced concrete buildings. It provides a literature review of previous studies that have analyzed buildings using nonlinear static pushover analysis to evaluate seismic performance. The goal of performance-based seismic design is to carefully assess how a structure will perform under earthquake loads by identifying performance objectives and evaluating the structure's capacity through nonlinear analysis. Previous studies have found that performance metrics like story displacement, drift, and base shear can be used to evaluate if a design meets life safety or other performance objectives. The document concludes that further research on nonlinear dynamic analysis and energy dissipation systems could help improve seismic performance estimation of reinforced concrete structures.
1) The study assessed the seismic performance of two irregular high-rise buildings with pre-existing torsion using incremental dynamic analysis. Shear walls were added to minimize torsion.
2) Nonlinear time history analyses were conducted on the original and modified buildings using scaled ground motions. Results were used to develop fragility curves showing probability of exceeding damage states.
3) At a peak ground acceleration of 0.35g, performance improved by 35% for one building and 70% for the other after adding shear walls to reduce torsion, indicating torsional irregularity negatively impacts seismic performance.
Analytical Study of Response of Multi-Storey Building under Biaxial Excitation IJERA Editor
Conventional practice of dynamic analysis using seismic codes recommends that the dynamic analysis is done by
considering earthquake force in one direction at a time i.e. uniaxial excitation. But the simultaneous effect of
asymmetricities in both orthogonal directions is neglected because of uniaxial excitation approach. Also the
behaviour of building during earthquake depends upon its shape size and overall geometry. The partial and
complete collapse of reinforced concrete buildings in recent earthquakes has raised the need to design the
building considering biaxial forces. Limited research has been carried out on effect of such biaxial excitation.
To get reliable results a regular and C shape model of multi-storey building is analysed using various timehistories
in SAP2000 v17. The angle of incidence of earthquake forces will be varying between 0 to 360 degrees.
The influence of the orthogonal horizontal component of input ground motion on seismic response of reinforced
concrete building is analysed by comparing the response of biaxial excitation with the response of uniaxial
excitation.
Change in maximum displacement values, considering this as the basic criteria, comparison of the responses due
biaxial excitation and uniaxial excitation is done. Time history analysis has been carried out using SAP2000
after validating the model with results available in reference literature.
It is observed and recommended that considering biaxial forces is necessary for an accurate determination of
response and also to reach an adequate design for serviceability earthquakes.
EFFECT OF SHEAR WALL AREA ON SEISMIC BEHAVIOR OF MULTI STORIED BUILDINGS WITH...Ijripublishers Ijri
The advances in three-dimensional structural analysis and computing resources have allowed the efficient
and safe design of increasingly taller structures. These structures are the consequence of increasing urban
densification and economic viability. The trend towards progressively taller structures has demanded a shift
from the traditional strength based design approach of buildings to a focus on constraining the overall motion
of the structure. Structural engineers have responded to this challenge of lateral control with a myriad
of systems that achieve motion control while adhering to the overall architectural vision.
Reinforced Concrete (RC) wall-frame buildings are widely recommended for urban construction in areas
with high seismic hazard. Presence of structural walls imparts a large stiffness to the lateral-force resisting
system of the building. Proper detailing of walls can also lead to ductile behavior of such structures during
strong earthquake shaking. One of the major parameters influencing the seismic behavior of wall-frame
buildings is the wall-area ratio. Thus shear wall area ratio is set as a key parameter which needs to be investigated
in this analytical study.
Seismic Performance of RC Frame Building with Different Position of Shear Wallijtsrd
An earthquake force is a very strange force and behaves quite differently than Gravity and Wind loads, striking the weakest spot in the whole three dimensional structure. It’s not earthquake that kills, in fact ignorance in design and poor quality construction results in many weaknesses in the structure that cause serious damage to life and property. Masonry Infill are frequently used to fill the gap between the vertical and horizontal resisting elements of the building frames with the assumption that these in fills will not take part in resisting any kind of load either axial or lateral. Hence, its significance in the analysis is generally neglected by the designer. In fact, infill wall and shear wall considerably enhance the rigidity and strength of the frame structure. Various researches suggest that the bare frame has comparatively lesser stiffness and strength than the infill frame and frame with shear wall, therefore their ignorance cause failure of many multistorey buildings when subjected to seismic loads. In the present study, the finite element analysis of RC frame models viz. a bare frame a frame with shear wall considering infill a bare frame with shear wall has been carried out and the number of storeys vary as G 3, G 5, G 7 and G 9. Linear analysis of all RC frame structures has been performed as per IS 1893 Part 1 2002 and IS 456 2000. In this study only in plane stiffness of masonry wall has been considered and infill panels modelled as equivalent diagonal strut elements. The behaviour of buildings subjected to Gravity and Seismic loads with the help of Response Spectrum Analysis using FEM based software and the effect on Time Period, Mass Participation factor, and Storey Drift has been observed. Strength and Rigidity of RC bare frame structures is found increasing after the inclusion of infill panels and shear wall. Bharath V B | Kuldeep Singh Solanki | Aashutosh Raj Yadav "Seismic Performance of RC Frame Building with Different Position of Shear Wall" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-5 , August 2020, URL: https://www.ijtsrd.com/papers/ijtsrd31728.pdf Paper Url :https://www.ijtsrd.com/engineering/civil-engineering/31728/seismic-performance-of-rc-frame-building-with-different-position-of-shear-wall/bharath-v-b
Performance based analysis of rc building consisting shear wall and varying i...Yousuf Dinar
Abstract:
Metropolitan cities are under severe threat because of inappropriate design and construction of structures. Faulty building designed without considering seismic consideration could be vulnerable to damage even under low levels of ground shaking from distant earthquake. So, structural engineers often are more concerned about the constructing Shear wall without knowing its performance with respect to infill percentage which may lead it to an over design state without knowing the demand. Nonlinear inelastic pushover analysis provides a better view about the behavior of the structures during seismic events. This study investigates as well as compares the performances of bare, different infill percentage level and two types of Shear wall consisting building structures and suggests from which level of performance shear wall should be preferred over the infill structure. To perform the finite element simulation ETABS 9.7.2 is used to get the output using pushover analysis. For different loading conditions, the performances of structures are evaluated with the help of base shear, deflection, storey drift, storey drift ratio and stages of number of hinges form and represented with discussion.
This document analyzes the seismic performance of a G+2 institutional building in Bhopal, India. The building is modeled and analyzed using STAAD.Pro software under different earthquake load combinations. Results are presented for maximum bending moment, shear force, axial force, joint displacement, and section displacement at each floor. The first floor experiences the highest bending moment of 164.07 kNm and maximum joint displacement of 8.484 mm in the X direction under seismic loads. The analysis provides optimal reinforcement for the building to limit damage to Grade 2 under seismic activity.
EVALUATION OF NONLINEAR STATIC PROCEDURES IN THE SEISMIC DESIGN OF REINFORCE...IAEME Publication
This document evaluates the applicability of nonlinear static procedures (NSP), also known as pushover analysis, in seismic design of reinforced concrete buildings. It compares maximum displacements from NSP to those from nonlinear dynamic analysis (NDA) using ground motions with probabilities of exceedance of 2% and 10% in 50 years in Los Angeles and Seattle. Four reinforced concrete framed structures are designed and analyzed using NSP and NDA. The study finds that NSP is suitable for structures where higher mode effects are insignificant, especially for higher intensity ground motions. However, NSP cannot completely replace NDA as it fails to fully capture dynamic behavior. Seismic hazard mapping is also essential for meaningful evaluation using NSP in Indian conditions.
This document evaluates the applicability of nonlinear static procedures (NSP), also known as pushover analysis, in seismic design of reinforced concrete buildings. It compares maximum displacements from NSP to those from nonlinear dynamic analysis (NDA) using ground motions with probabilities of exceedance of 2% and 10% in 50 years in Los Angeles and Seattle. Four reinforced concrete framed structures are designed and analyzed using NSP and NDA. The study finds that NSP is suitable for structures where higher mode effects are insignificant, especially for higher intensity ground motions. However, NSP cannot completely replace NDA as it fails to fully capture dynamic behavior. Seismic hazard mapping is also essential for meaningful evaluation using NSP in Indian conditions.
Seismic Analysis of Multi-Storey Structure Subjected To Different (1).pptxGoneJustin
This document summarizes a presentation on analyzing the seismic behavior of multi-story buildings with varying heights using ETABS software. It analyzes buildings with 5, 6, 7, and 8 stories under seismic, dead, and live loads. The objectives are to check the seismic response of buildings using ETABS, analyze forces, moments, stresses, strains, and deformations, and analyze story drift, displacement, shear, stiffness, period, and frequency on different floors. The methodology involves modeling the buildings in ETABS and subjecting them to static and dynamic analysis to determine responses like base shear, maximum displacement, tensile forces, and moments and shear forces.
Dynamic Analysis of Multi-Storeyed Frame-Shear Wall Building Considering SSIIJERA Editor
The structural system of a high-rise building often has a more pronounced effect than a low rise building on the
total building cost and the architecture aspect of building. Shear walls are lateral load resisting structural
systems which provide stability to structures from lateral loads like wind and seismic Loads. The design of multi
storey building is to have good lateral load resisting System along with gravity load system for safety of
occupant and for better performance of structure even in most adverse condition. The main scope of this project
is to apply class room knowledge in the real world by designing a multi-storied residential building. Shear walls
are more efficient in resisting lateral loads in multi storied buildings. Steel and reinforced concrete shear walls
are kept in major positions of multi storied buildings which are made in consideration of seismic forces and
wind forces. To solve this purpose shear walls are a very powerful structural elements, if used judiciously can
reduce deflections and stresses to a very great extent. Our project contains a brief description of building with
shear wall and without shear wall thoroughly discussed structural analysis of a building to explain the
application of shear wall. The design analysis of the multi storied building in our project is done through
STAAD-PRO, most popular structural engineering software. It is featured with some ultimate power tool,
analysis and design facilities which make it more users friendly.
IRJET- Comparative Study of Effect of Different Positions of Shear Wall o...IRJET Journal
This document presents a comparative study analyzing the effect of different positions of shear walls on transfer girders in 10, 15, 20, 25, and 30-story reinforced concrete buildings with floating columns on the exterior frames. The buildings were analyzed using wind analysis, conventional analysis, and construction stage analysis in ETABS. Results like bending moments and displacements of the transfer girders were compared for models with shear walls at the core, corners, periphery, and without shear walls. The study found that shear walls at different positions reduced structural responses of the transfer girders, with core walls performing best for lower stories and corner walls for mid-height buildings. Conventional analysis generally provided the critical results adopted for design.
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Comparative study of Performance of RCC Multi-Storey Building for Koyna and Bhuj Earthquakes
1. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -2) May 2017, pp.45-52
www.ijera.com DOI: 10.9790/9622-0705024552 45 | P a g e
Comparative study of Performance of RCC Multi-Storey
Building for Koyna and Bhuj Earthquakes
Atul N.Kolekar1
, Y.P.Pawar2
, Dr. C. P. Pise3,
D. D. Mohite2
, S. S. Kadam2
,
C. M. Deshmukh2
.
P.G. Student, Department of Civil Engineering, SKNSCOE, Pandharpur, Maharashtra, India1
Assistant Professor, Department of Civil Engineering, SKNSCOE, Pandharpur, Maharashtra, India2
Associate Professor and HOD, Department of Civil Engineering, SKNSCOE, Pandharpur, Maharashtra, India3
ABSTRACT
The recent history of earthquakes have indicated that if the structures are not properly designed and constructed
with required quality may cause great damage to structures. This fact has resulted in to ensure safety against
earthquake forces of tall structures hence, there is need to determine seismic responses of such building for
designing earthquake resistant structures by carrying seismic analysis of structure. In the present work dynamic
analysis of G+12 RC multi-storied framed building considering for Koyna and Bhuj earthquake is carried out by
response spectrum analysis and time history analysis and responses of such building are comparatively studied
with the help of SAP2000 software. Two time histories (i.e. koyna and Bhuj) have been used to develop
different acceptable criteria (base shear, storey displacement, storey drift). From the results it is recommended
that time history analysis should be performed as it predicts the structural response more accurately than the
response spectrum analysis. Pushover Analysis is also performed for the same building and from results it is
found that building is seismically safe.
Keywords—SAP2000, Response Spectrum Analysis, Seismic Responses, Time History Analysis,Pushover
Analysis.
I. I .INTRODUCTION
The process of urbanization has been a
common feature throughout the centuries,
Globalization and Growth of high rise buildings is
the need of current population, earthquakes have the
potential for causing the greatest damages to those
tall structures. Hence, it is important to take in to
account the seismic load for the design of high-rise
structure. Earthquakes occurred in recent past,
particularly in the state of Gujarat (Bhuj, 2001) have
indicated that if the structures are not properly
designed and constructed with required quality may
cause great damage to structures and also loss of life.
Reinforced concrete buildings have been destructed
on a very large scale in Bhuj earthquake of Jan 26th
2001, Even though these buildings are analyzed and
designed as per IS code. The damages are caused by
inconsistent seismic response, irregularity in mass
and plan, soft storey and floating column etc. Hence
it becomes necessary to determine actual seismic
performance of building subjected to seismic forces.
Time history analysis gives more realistic behavior
of the building. It gives more accurately seismic
responses than response spectrum analysis because
of it includes material nonlinearity and dynamic
nature of earthquake.
Patil A. S. and Kumbhar P. D. [1] analyzed
ten storied RC building considering different seismic
intensities and seismic responses of such building
are evaluated with the help of SAP2000 software.
Five different time histories have been used
considering seismic intensities V, VI, VII, VIII, IX
and X for establishment of relationship between
seismic intensities and seismic responses. From the
study it is recommended that, to ensure safety
against earthquake force, analysis of multistoried RC
building using Time History method becomes
necessary.
Prashanth P. et al. [2] designed multi storey
buildings with regular and irregular plan (as per IS
1893) using STAAD Pro and ETABS software
separately. From the design results of beams, we
may conclude that ETABS gave lesser area of
required steel as compared to STAAD Pro. Form the
design results of column; since the required steel for
the column forces in this particular problem is less
than the minimum steel limit of column (i.e., 0.8%),
the amount of steel calculated by both the software
is equal.
Wakchaure M. R. and Ped S. P. [3] studied
the effect of masonry walls on high rise building.
Linear dynamic analysis on high rise building with
different arrangement was carried out. Earthquake
time history is applied to the models. The width of
strut was calculated by using equivalent strut
method. All analysis was carried out by software
ETABS. Base shear, storey displacement, story drift
RESEARCH ARTICLE OPEN ACCESS
2. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 5, ( Part -2) May 2017, pp.45-52
www.ijera.com DOI: 10.9790/9622-0705024552 46 | P a g e
was calculated and compared for all models. The
results showed that infill walls reduce
displacements, time period and increases base shear.
Parvathaneni S. and Elavenil S. [4] done the
three dimensional RC frames analysis for gravity
loads and lateral loads and the response spectrum
analysis and time history analysis carried out to
evaluate seismic performance of frame. The
response spectrum analysis and time-history analysis
is done by using ETABS with compatible
accelograms, and results obtained from analysis are
verified. Nonlinear time history analysis is done for
studying the inelastic behavior of the structures.
Bahador et al. [5] studied Multi-storey
irregular buildings with 20 stories using software
packages ETABS and SAP 2000 for seismic zone V
in India. The investigation of dynamic responses of
building under actual earthquakes considering EL-
CENTRO 1949 and CHI-CHI Taiwan 1999 were
done. They highlighted the exactness and accuracy
of Time History analysis in comparison with the
most commonly adopted Response Spectrum
Analysis and Equivalent Static Analysis.
N.M.Nikam [20]considered G+15and G+20
storied building with provision of shear wall at
different position and pushover analysisis carried
out.They found that fundamental time period is
increased due to provision of shear wall as well as
global stiffness is increases.
MohommadAzoz and AnshulR.Nikhade
[21] studied pushover analysis on reinforced
concrete structure in which G+10 building was
subjected to push in X direction and push in Y
direction. Analysis was done in sap2000 15.They
found that slope of pushover curve is gradually
changed with increase of the lateral displacement of
the building. From results the concluded that the
building considered for analysis not requires
retrofitting.
II. OBJECTIVES
1. To analyze the RCC multistory building for
seismic forces.
2. To evaluate various responses such as base
shear, lateral displacement, storey drift etc. of
building for Koyna and Bhuj earthquakes.
3. To compare effect of Koyna and Bhuj
earthquakes on performance of RCC multistory
building.
4. To compare software results with current
practices.
5. To investigate material non-linearity behaviour
considering plastic analysis.
III. METHODS OF ANALYSIS:
A. Equivalent Static Analysis
All design against seismic loads must
consider the dynamic nature of the load. However,
for simple regular structures, analysis by equivalent
linear static methods is insufficient. This is permitted
in most codes of practice for regular, low- to
medium-rise buildings. This procedure takes into
account the dynamic behavior of building in an
approximate manner; it does not require dynamic
analysis. The static method is based on the
formulation given in IS codes thus it is easiest one
and requires less computational efforts. First, the
design base shear is computed for the whole
building, and it is then distributed along the height of
the building. The lateral forces at each floor levels
thus obtained are distributed to individual’s lateral
load resisting elements.[3,5]
B. Response Spectrum Method
Response spectrum method is the linear
dynamic analysis method. In this method the peak
structural response can be obtained directly during
an earthquake using the earthquake responses (or
design) spectrum. It represents the maximum
responses of idealized SDOF systems with certain
time period and modal damping, during earthquake
ground motion. The maximum response curve is
plotted for various damping values and against the
undamped natural period, and can be represented in
terms of maximum relative displacement or
maximum relative velocity.[5,9,10,11,15,16]
C. Time History Method
Time History method is step by step
analysis of the dynamic response of the structure at
each time increment when its base is subjected to
ground motion time history record. To perform such
an analysis a representative earthquake time history
is essential for a structure being evaluated. It is used
to determine the seismic response of a structure
under dynamic loading of considered earthquake.[1,
4, 14, 18]
D. Pushover Analysis
Pushover analysis is a static non-linear
procedure of analysis of building where loading is
goes on increasing with certain predefined pattern.
The structure is pushed until a collapse mechanism
is developed. With increase in magnitude of loads
weak links and failure modes of building are found.
The pushover analysis is used to get the relation
between base shear and roof displacement. I.e.
Pushover curve.[20,21,22]
3. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
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IV. STRUCTURAL MODELING AND
ANALYSIS :
The G+12 RC multistory framed building
considered for analysis to know the realistic
behavior during earthquake with the general form of
plan shown in fig 1. RC multi-storey framed
building is modeled for two time histories i.e. Bhuj
and Koyna. Plan dimensions in X and Y direction
are 20m and 20m respectively. The buildings are
consisting of columns with dimension 600mm x
600mm for all stories and beam with dimension
300mm x 700mm. the floor slabs are taken as
150mm thick. The height of all floors is 3.2m and
height of plinth is 2m. soil type is Medium. Modal
damping 5% is assumed with SMRF and I=1. The
columns are assumed to be fixed at the base.
Material concrete grade is M30 and while steel
Fe415 is used.
Fig. 1 Plan and Elevation of G+12 RC multistoried framed Building in SAP2000
V. RESULT AND DISCUSSION:
The comparative study of storey
displacement, base shear and storey drift of
building in different stories by response spectrum
analysis and time history analysis for
Koyna&Bhujis performed here. The results
obtained from analysis are given below and
comparative study is carried out as follows
D. Comparison of Base Shear:
Table 1: comparison of story shear for earthquake by RSM and THM
Story level
(mm)
Story shear (kN)
Koyna-THM Koyna-RSM Bhuj-THM Bhuj-RSM
43600 275.137 340.344 377.016 510.517
40400 611.824 759.264 819.801 1138.897
37200 893.170 1114.448 1283.648 1671.674
34000 1254.304 1441.154 1650.849 2116.733
30800 1504.689 1654.638 1910.848 2481.958
27600 1830.732 1850.156 2022.298 2775.235
24400 2138.652 2002.965 2394.417 3004.448
21200 2315.940 2118.321 2777.447 3177.482
18000 2432.479 2201.481 2968.719 3302.222
14800 2508.256 2257.701 2956.351 3386.552
11600 2366.272 2292.238 2818.154 3438.357
8400 1962.451 2310.348 2646.438 3465.523
5200 1566.039 2317.288 2508.267 3475.933
2000 1691.523 2317.387 2460.222 3476.294
0 1691.523 2317.387 2460.222 3476.294
4. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
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www.ijera.com DOI: 10.9790/9622-0705024552 48 | P a g e
Fig. 2 Comparison of Base Shear for Koyna&Bhuj Earthquake by THM&RSM
By Time History method base shear are 1691.523
kN for Koynaand forBhuj 2460.222kN and by
Response Spectrum Method values of base shear
are2317.387kN for Koyna and 3476.294kN for
Bhuj earthquake
.
E. Storey Displacements:
Table 2: Comparison of story displacement for earthquake by RSM and THM
Story level
(mm)
Story displacement (mm)
Koyna-THM Koyna-RSM Bhuj-THM Bhuj-RSM
0 0 0 0 0
2000 0.681 0.734 0.492 1.102
5200 3.077 3.527 2.451 5.291
8400 5.497 6.653 4.732 9.982
11600 7.714 9.707 7.038 14.562
14800 9.415 12.623 9.252 18.901
18000 11.589 15.304 11.291 22.957
21200 13.503 17.819 14.017 26.717
24400 15.198 20.115 17.484 30.174
27600 16.898 22.209 20.939 33.315
34000 20.063 25.691 27.404 38.538
37200 21.187 27.012 29.980 40.521
40400 21.347 28.004 31.827 42.009
43600 21.528 28.665 32.026 43.001
Fig. 3 Comparison of storey displacement for Earthquakes using RSM&THM
5. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
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www.ijera.com DOI: 10.9790/9622-0705024552 49 | P a g e
It has been observed that values of storey
displacement are increases at top level from
ground. From the graph it is observed that the value
of displacements varies linearly for response
spectrum analysis. The value of top storey
displacements for Bhuj earthquake is 32.026mm
and forKoyna earthquake it is 21.528mm by time
history analysis.
F. Storey Drift :
As per clause no 7.11.1 of IS-1893 (Part-1) 2002
[7]: the storey drift in any storey due to specified
design lateral force with partial load factor of 1
shall not exceed 0.004 times the storey height.
Maximum storey drift for building= 0.004 X h, for
3.2m storey height it is 0.0128m.
Table 3: Variation of story drift for earthquake by RSM and THM
Story level
(mm)
Story drift (m)
Koyna-THM Koyna-RSM Bhuj-THM Bhuj-RSM
0 0 0 0 0
2000 0.000323 0.000734 0.000486 0.001102
5200 0.001212 0.002793 0.001708 0.004189
8400 0.001526 0.003126 0.002131 0.004689
11600 0.001700 0.003054 0.002293 0.004582
14800 0.001670 0.002893 0.002339 0.004339
18000 0.001546 0.002704 0.002261 0.004056
21200 0.001517 0.002506 0.002157 0.003763
24400 0.001455 0.002305 0.002094 0.003457
27600 0.001306 0.002094 0.002036 0.003141
30800 0.001083 0.001868 0.001887 0.002802
34000 0.000924 0.001613 0.001668 0.002421
37200 0.000752 0.001322 0.001347 0.001983
40400 0.000697 0.000992 0.001044 0.001488
43600 0.000470 0.000661 0.000717 0.000992
Fig. 4 Comparison of storey Drifts for Earthquakes using RSM&THM
G. Seismic loads on Building-
The base shear force is calculated as per IS-1893(part-1) 2002 is given by
1) forKoyna (Z=0.24) –
Z= Zone factor =0.24
I=Importance factor = 1
R= Response reduction factor = 5
Sa/g = 1.06872
W = Total seismic weight of the building
The dead load on each floor = 3.5 kN/m2
The Live load on each floor = 4kN/m2
Total seismic load on the building = 88382.66 kN
Vb = (Z/2 x I/R x Sa/g) xW
=(0.24/2 x 1/5 x 1.06872)
The Base Shear = 2272.30 KN
6. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
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2) For Bhuj (Z=0.36) -
Z= Zone factor =0.36
I=Importance factor = 1
R= Response reduction factor = 5
Sa/g = 1.06872
W = Total seismic weight of the building
The dead load on each floor = 3.5 kN/m2
The Live load on each floor = 4kN/m2
Total seismic load on the building = 88382.66 kN
Vb = (Z/2 x I/R x Sa/g) xW
=(0.36/2 x 1/5 x 1.06872)
The Base Shear = 3409.12kN
E. Pushover Analysis –
The Pushover analysis is carried out as per the
provisions in the ATC 40 and FEMA 356 using the
software SAP 2000. The analysis result gives the
actual performance of the building when subjected
to the lateral earthquake loading.
1. Hinge formation
As per the seismic requirement, the columns should
be stronger than the beams. So the hinges should be
formed in the beam first rather than in the columns.
The figure below shows the hinge formation in the
building frame.
Fig. 5.Hinge formation at performance point for PUSH X for Koyna and Bhuj
2. Capacity spectrum and the Performance
point -The performance of building in any
earthquake can be assessed by superimposing the
capacity diagram on the seismic demand diagram.
Fig. 6: Capacity spectrum of Koyna for PUSH X
7. AtulN.Kolekar .et.al. Int. Journal of Engineering Research and Application www.ijera.com
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Fig. 7: Capacity spectrum of Bhuj for PUSH X
G .Comparision Of Base Shear Result:
Table 4:Comparison of Base shear
Base shear(KN) Manual calculation Software result SAP2000
Bhuj 3409.12 3476.294
Koyna 2272.30 2317.387
VI. CONCLUSION
From the above results it is concluded that;
1]The seismic response such as base shear for Bhuj
earthquake are found to be more by 45.44% than
Koyna earthquake by using time history analysis.
2] The base shear of Koyna and Bhuj earthquake
by response spectrum method is found to be
37.01% and 41.30% higher than time history
method.
3] The top story displacement of Koyna and Bhuj
earthquake by response spectrum method is found
to be 33.15% and 34.26% higher than time history
method.
4] The values of the storey drifts for all the stories
for all the effects are found to be within the
permissible limits specified as per IS: 1893-2002
(Part I).
5] From the results it is recommended that time
history analysis should be performed as it predicts
the Structural response more accurately than the
response spectrum analysis.
6] From Table no.4 it is observed that Base shear
results of SAP2000 software are found to be more
by 1.92 % than manually calculated base shear.
7] From figure no.6 it is found that the hinges are
found in the beams rather than columns which
show the ductile behaviour of the frame.
8] It is concluded that building used for pushover
analysis is seismically safe because performance
point base shear is greater than design base shear
for both koyna and Bhuj earthquakes.
9] The demand curve intersects the capacity curve
near the elastic range; the structure has a good
resistance and high safety against collapse.
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