Comparative Study of Seismic Response of Structure with Different Base Isolators

Conventional seismic design attempts to make building that do not collapse under strong earthquake shaking, but may sustain severe damage to non-structural elements as well as some structural members. This may render the building non-functional after the earthquake, which is not acceptable for important buildings, like hospitals. Special techniques are required to design buildings such that they will not suffer damage even in a severe earthquake. One of the technologies used to protect buildings from damaging earthquake effect is “Base Isolation�. The idea behind base isolation is to detach (isolate) the building from the ground in such a way that earthquake motions are not transmitted up through the building, or at least greatly reduced. This paper presents the seismic behaviour of R.C.C frame structure with different base isolators. Two types of base isolators are considered namely Lead Rubber Bearing (LRB) and Friction Pendulum System (FPS). Isolators are designed for different story height (12 m, 24 m, 36 m, 48 m). Response quantities like base shear, time period and story displacement will be extracted for building with fixed base and building with isolated base by performing Response Spectrum Analysis (RSA) to establish their effectiveness and final conclusion will be made on the bases of study.