International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
Effects of Providing Shear wall and Bracing to Seismic Performance of Concrete Building Fazal U Rahman Mehrabi1, Dr.D.Ravi Prasad2 1ME.Tech
2
(Engineering Structure) from, NIT Warangal, India Assistant Professor, Department of Civil Engineering NIT Warangal
---------------------------------------------------------------------***--------------------------------------------------------------------1. INTRODUCTION Abstract - System strengthening and stiffening are the 1.1. Pushover Analysis most common seismic performance improvement Is an approximate analysis method in which the strategies adopted for buildings with inadequate lateral structure is subjected to monotonically increasing force resisting systems. most retrofit systems that lateral forces with an invariant height-wise distribution increase structural strength, such as the addition of until a target displacement is reached. Pushover walls or frames, will also increase structural stiffness. analysis consists of a series of sequential elastic Exceptions to this are relatively local-retrofit measures analysis, superimposed to approximate a forcethat strengthen existing elements without greatly displacement curve of the overall structure. A two or altering their stiffness.The effect of strengthening a three dimensional model which includes bilinear or triLinear load-deformation diagrams of all lateral force structure is to increase the amount of total lateral Force resisting elements are first created and gravity loads required initiating damage events within the structure. If are applied initially. A predefined lateral load pattern this strengthening is done without stiffening, then the which is distributed along the building height is then effect is to permit the structure to achieve larger lateral applied. The lateral forces are increased until some displacements without damage.The seismic response of members yield. The structural model is modified to RC building frame in terms of various parameters such account for the reduced stiffness of yielded members and lateral forces are again increased until additional as base shear, storey displacement, performance point members yield. The process is continued until a control and the effect of earthquake forces on multi storey displacement at the top of building reaches a certain building frame with the help of pushover analysis is level of deformation or structure becomes unstable. carried out in this paper. In the present study a building Roof displacement is plotted with base shear to get the frame without Bracing, shear wall and with Bracing, global it is generally believe that the conventional shear wall is designed as per Indian standard. IS 456elastic design analysis method cannot capture many 2000 and IS 1893-2002. The main objective of this study important aspects that control the seismic performance of the building. The capacity of building to undergo is to check the kind of performance a building can give inelastic deformations governs the structural behavior when designed as per Indian Standards and also to of building during seismic ground motions. For that determine the effect of providing shear wall and Bracing reason, the evaluation of building should consider the to building frame. The pushover analysis of the building inelastic deformation demanded due to seismic frame is carried out by using structural analysis and loading. On the other hand, linear elastic analysis does design software SAP 2000. Further, the importance of not provide information about real strength, ductility Shear wall and bracing and its contribution for and energy dissipation in the structure [1]. Nonlinear dynamic analysis is principally convenient approach. strengthening also discussed. However, it is very complex and not practical for every design. It needs time history of ground motion data and Key Words: Moment resistance, Shear Wall, Bracing, detailed hysteretic behavior of structural members Base Shear, Capacity Curve, Performance Point, which cannot be predicted. This analysis is appropriate Plastic Hinges States, Storey Drifts, Global Stiffens, for research work and for design of important Pushover Analysis & SAP2000. structures [2]. To estimate seismic demands for building, the structural engineering profession is now Š 2017, IRJET
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