NON-LINEAR PUSHOVER ANALYSIS OF RCC BUILDING WITH BASE ISOLATION SYSTEM

Buildings are designed as per the code regulations meeting all specific requirements of code and assuming a linear elastic behaviour for the structural members. Moreover, it is also necessary to know the behaviour of a building that were designed with older codes or which may not have been designed for earthquake forces. During the seismic excitation the building responds well beyond its elastic and linear capacity and enters into non-linear stage. So, the present work is intended to provide a systematic procedure to assess the behaviour of a structure during the seismic excitation. For studying the behaviour a non-linear static analysis procedure known as pushover analysis is used. The literature pertaining to pushover analysis is reviewed. A Nine storey residential building located in the Hyderabad city, which was designed and constructed for gravity loads alone, was considered for analysis. The present structure is studied using the evaluation procedures provided in ATC-40 and FEMA-273 documents. Under detailed evaluation a target displacement for Immediate Occupancy, Life Safety, Collapse Prevention was given and the performance is checked in accordance with IS 1893:2002