Seismic Assessment and Analysis of Base Isolated Building

Abstract

The present work attempts to study the effectiveness of base isolation using lead rubber bearings (LRB) over conventional construction, using a case study of identical conventional and isolated building modelled in the most seismically active region in India (Zone V). The modeling procedure for both fixed base and base isolated building in finite element software, is carried out for a (G+8) storied building. The dimensions of LRB are calculated using a MATLAB code which is also cross-checked through a Visual Basic (VB) script. The results of key parameters including the variation in storey displacement, storey drift, storey shear, and overturning moment of isolated building is evaluated. Using base isolation system at the base of a (G+8) storied building, it is found that the building was better protected, leading to the hypothesis that base isolation is an ideal technique for structures more than 6-7 storeys. It was found that the maximum displacement of base isolated model is very. Also, the storey overturning moment & storey shear are also found to be reduced in the case of base isolated building.