SEISMIC PERFORMANCE INVES"nGA"nON OF BASE ISOLATION SYSTEM FOR TYPICAL RESIDENTIAL BUILDING IN BANGLADESH

Abstract

Base isolation system for building structure is a popular technique to release extensive energy by allowing displacement and hence to protect structures from earthquake excitation. This paper aims to investigate the performance of a base isolated building against seismic hazard compare to typical fixed base building using ETABS 2015. Commonly used isolator like rubber bearing and friction pendulum bearing are used at the base of the building. Parametric studies are conducted to study linear time history analysis and to investigate the performance of different type of isolator. In the parametric study, comparisons are made among fixed base, rubber and friction pendulum isolated based structure on the basis of base shear, story drift, displacement, acceleration and time period. Finally nonlinear static pushover analysis has also been conducted as per FEMA-440. It is observed from the study that a base isolation system in building significantly reduces base shear with the increment of displacement and time period compared to fix based building significantly.