Abstract— Base isolation (BI) is a technique that has been used around the world to protect the building structures from the damaging effects of earthquake. The installation of isolator in building at base level considerably increases the time period of the structure, which means it reduces the possibility of resonance of the structure giving rise to better seismic performance of the building. The analysis is performed to compare the effectiveness of base isolation in regular and irregular multi-storied RC frame building. For this study, 15 storied R.C frame building has been considered and Time History analysis is carried out using ETABS software version 2013. The Lead Rubber Bearing (LRB) is designed by considering the maximum gravity load coming on the column at the base and the same has been used for analysis. The results obtained from the analysis are compared in terms of time period, base shear, story displacement and story acceleration. Time period for the base isolated structures are higher than that of the fixed base structure. Due to the presence of isolator, base shear and story acceleration are significantly reduced in each direction (X and Y direction) as compared to fixed base building. When compared to base isolated regular building the plan irregular (re-entrant corner) and vertical irregular (vertical geometric irregular) base isolated building gives better performance.
Keywords— Base Isolation, Time History Analysis, lead rubber Bearing, UBC 97 code, ETABS 2013, Base shear.
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