Performance of Lead-Rubber base Isolated Building Structure in High Seismic Prone Region

Abstract

The enormous proportions multistory RC fixed structure is compared with LRB base isolated building under real earthquake ground motion. The structural system considered here may be a 10 story R.C.C. building (idealized as a shear type building), situated in zone IV, with hard strata & spectral acceleration as per IS1893-2016. during this work an ETABS program is employed to review the response of preset and bottom inaccessible (LRB base) structure. The optimum answer, parametric isolation properties (LRB) are studied for various damping values of LRB (?=0.1, 0.15, 0.20, 0.25, 0.30) with different isolation period of time as (Teff) 2.0, 2.5, 3.0 and 3.5 sec. For this analysis a actualtimehistory,namely,ImperialValley-02,havebeenextracted from “PEER GROUND MOTION DATABASE”. to review the ground spectral response the variation of top floor absolute acceleration, displacement at each floor level are computed. so as to match the obtained response, SeismoMatch-2018 algorithm spectrum IS1893-2016, are used under different time domain. From the analysis it's revels that base isolated structure reduces response performance considerably in compare to the fixed structure which impart an important role in reducing the sizing of structural members and amount of designed steel requirement. A Top floor acceleration and displacement floor spectra have been developed to study the exact earthquake response.