Abstract

This article presents an outline of the base isolation techniques with special emphasis for reducing earthquake forces on the structures. Base isolation is an anti-seismic design strategy that can reduce the effect of earthquake ground motion by isolating the superstructure from the foundation. The important feature of the base isolation technique is that it introduces flexibility to the structure. In this paper linear static and linear dynamic analysis of 3D R.C building models of G+10, G+15 and G+ 20 storeys situated in all seismic zones is carried out by providing base isolator. The base isolator considered here is Lead Rubber bearing (LRB) system and it is designed by taking maximum vertical reaction from analysis. The FE analysis involving Modal, Equivalent static and Response spectrum are carried out for both fixed base and base isolated models and the results obtained are in terms of natural time period, mode shapes, base shear, storey displacement and storey drift. All the results are tabulated, discussed and conclusions are drawn.