Performance Evaluation of Base Isolated Building

There is a need to reduce the seismic demand on buildings so that they can perform better during future earthquakes. This need can be fulfilled using the concept of base isolation. In this paper, a G+7 story framed structure has been analyzed to study the effect of base isolation on the seismic performance of structures. The most common type of isolation system, i.e., laminated lead rubber bearing (LLRB) has been designed, and response of the base isolated building has been compared with conventionally designed earthquake-resistant building. The computer program SAP 2000 has been used for modeling and analysis. Reinforcement requirements for both the buildings have been compared, and it has been found that base isolated building requires about 30% less steel than a conventionally designed building for the same level of seismic protection. To compare the nonlinear response of the conventionally designed building and base isolated building, nonlinear static pushover analysis was performed.