Comparative Shake Table Study on Seismic Performance of Base Isolated Structure

The aim of this paper is to do a comparative study of the response of a base isolated structural system with the corresponding response of a structural system without base isolation in order to investigate the effectiveness of the isolation system. An experimental shake table study is carried out to compare the seismic behavior of with and without base isolation system. Base isolation system, namely the friction pendulum bearing type of double concave friction pendulum (DCFP) bearing is used. Study on seismic performance are carried out on four structural configurations consisting of model without base isolation, model with base isolation, model without base isolation with mass and model, with base isolation without mass. There were total different sixteen model with different storey height G+1 storey, G+2 storey, G+3 storey, G+4 storey analyzed and compare the seismic response of the structure subjected to earthquake motion in above four structural configurations. From experimental study it was found that the top storey displacement of model with base isolation reduced to 60% to 70%. The results show that the response of isolated system is found to be less in comparison to without base isolation implying that the isolation is quite effective in reducing the displacement response of the systems.