COMPARATIVE PERFORMANCE OF LEAD RUBBER BEARING ISOLATOR AND FRICTION PENDULUM ISOLATOR FOR IRREGULAR BUILDINGS

Pooja H. Vora
Civil engineering department & Marwadi Education Foundation, Rajkot , IN

Dr. Mazhar A. Dhankot
Civil engineering department & Marwadi Education Foundation, Rajkot , IN

Prof. Amit J. Thoriya
Civil engineering department & Marwadi Education Foundation, Rajkot , IN

Keywords: Base isolation, LRB, FPS, Irregular buildings, Time History Analysis

Abstract

Base isolation has been adopted and implemented as one of the promising technologies to resist the earthquake forces. The base isolation decouples the superstructure of building from the ground level by interposing structural element with low horizontal stiffness between superstructure and foundation level. This gives the structures fundamental frequency that much lower than both of its fixed base frequency and predominant frequency of earthquake ground motion. Presence of different irregularities like soft storey, weak storey, re-entrant corners, in plane discontinuity, out of plan offset etc. is major deficiency in building causing problem of stress concentration and additional torsion. Past study shows that due to the presence of these irregularities structures are more prone to damages as compared to regular structures. This research paper will be focus on to study the effect of Lead Rubber Bearing Isolator and Friction Pendulum Isolator on the irregular building. The various dynamic parameters like base shear, top floor absolute acceleration, base displacement, storey drift will be studied for different earthquake ground motions and comparative as well as parametric study between regular and irregular building will be carried out. The analytical study will be carried out by nonlinear time history analysis using SAP200 software.

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