Study on seismic response prediction for seismic isolated structure consisting of elasto-plastic element and sliding element based on energy balance

Abstract

This paper presents a new type of energy balance equation for a seismic isolation system, which consists of a restoring force element, a damping element and a bearing element, to improve the accuracy of seismic response predictions. The proposed energy balance equation has advantages that it can be taken into account the yield displacement and the bilinear factor for the damping element and the friction force for the bearing element as compared the previous energy balance equation. These advantages will lead to the seismic responses corresponding to the maximum shear force coefficient and the maximum response displacement for the seismic isolation system obtained from the time-history response analysis. This paper demonstrates that the proposed energy balance equation can capture the seismic responses obtained from the time-history response analysis taken into account the various ground motions. Additionally, the optimal damping force that leads to the reducing between the shear force coefficient and the response displacement is presented on the basis of the proposed energy balance equation.