MITIGATING SEISMIC HAZARD BY BASE ISOLATION

Abstract

Base isolation has been used as one of the most wildly accepted seismic protection systems that should significantly separate a superstructure from substructure on which it is resting on a shaking ground, there by sustainably saving entire structures against earthquake forces as well as inside non-structural failures. The main purpose of earthquake engineering is to design the structure in such a way that the damage in the structures and its other components during an earthquake is minimized. In the present study lead rubber base isolator (LRB) has been designed for a general low rise building. The building is then analyzed with ETABS software. The comparison has been made between the fixed base building and base isolated building to check the performance of the base isolated
building. The seismic responses with respect to base shears and inter-story drifts have been compared before and after the installation of LRB isolation systems in the framed building. The main function of the LRB isolator is to extend the time period of structural vibration by increasing lateral flexibility in the framed structure, and ground accelerations transferred into the superstructure can dramatically decrease