EFFECT OF BASE ISOLATION IN MULTISTORIED REINFORCED CONCRETE BUILDING

The concept of isolator in building at base level reduces the possibility of resonance of the structures and increases the time period of the structure giving rise to better seismic performance of the building. The study is performed for comparison the effectiveness of fixed base and base isolated multistoried RC frame building. For the study, two buildings are considered the first structure G+5 storey building and second structure G+17 storey building which is designed and analyzed. The lead rubber bearing (LRB) and friction pendulum system is designed as per UBC97 and ASCE07 code and the same was used for the analysis of base isolation system. The results obtained from the analysis were time period and base shear. Time period for the base isolated structure higher than that of fixed based structure. Base shear is significantly reduced in each direction (X and Y direction) as compared to fixed base building by using the isolators.