OPTIMUM FRICTIONAL ELEMENT IN SLIDING ISOLATION SYSTEM

Abstract

In the present paper, Hospital buildings are of great importance after any natural calamity such as
earthquake. The structural and non-structural components should remain operation and safe after earthquake. So to
mitigate the effects of earthquake on the structure the base isolation technique is the best alternative as a seismic
protective system. The basic idea of base isolation system is to reduce the earthquake induced inertia forces by
increasing the fundamental period of the structure. The aim of this study is the use of High Density Rubber Bearing
(HDRB) and Friction Pendulum System (FPS) as isolation devices and then to compare various parameter between
fixed base condition and base isolated condition by using ETAB software. In this study four different types of buildings
which include (G+20) storey with strut, (G+20) storey without strut, (G+30) with strut, (G+30) without strut having
same plan are used as test models. Nonlinear time history analysis is carried out for both fixed and base isolated
structure by considering earthquake ground motion records. The Indian Bhuj earthquak e data are used for analysis. The
result obtained shows the reduction in base shear, storey drift, storey shear in both direction and increase in the
displacement and time period for the base isolated structure. Finally, Parameter such as storey displaceme nt, storey
drift, storey shear and base shear are compared and obtained results were presented by graphically format.