EFFECTIVENESS OF SEISMIC BASE ISOLATION IN REINFORCED CONCRETE MULTI-STOREY BUILDINGS

The dynamic reaction of a building to earthquake ground motion is the most critical reason for earthquake actuated damage to structures. The basic concept in seismic isolation is to protect the structure from the damaging effects of an earthquake by introducing a flexible support isolating the building from the shaking ground. Seismic isolation consists of essentially the installation of mechanisms such as isolators which decouple the structure from base. In the present study, the seismic response of the reinforced concrete building, base isolated by lead rubber bearings (LRBs) is compared with the seismic response of the same structure which does not have base isolation system. The main objective is to check effectiveness of base isolation system and to find story displacement, story drift and base shear. A time history analysis is carried out for the 10 storey buildings for El Centro earthquake by using SAP2000 software