Influence at Mass of the Base Isolation System in Affecting the Higher Modes of Vibration

Base Isolation is a technology of mitigating the effects due to earthquakes with aspect dissipating seismic waves away from superstructure, by isolating superstructure ground.This concept widely essential be implemented in structures(buildings) irrespective many factors. There are several materials which could as base isolator, however need reduction number isolators dueto various factors developing country finds difficult implement. In this paper, three-storey unsymmetrical building considered for study isolated varying mass foundation beam, (Transfer beam) thereby reducing building.Furthermore,the mode shapes and frequencies structure without isolation considering system key factor were analysed compared hence variation has promising effect altering higher modes vibration. The analysis prolonged using another methd UBC-1997 provisions compared. both methods, influence remarkable