Optimization of seismic isolation laminated rubber using GA and nonlinear vibration analysis methods

Abstract

In this paper, PFT-HYS (Hysteresis system using the restoring force model of power function type) method is applied to the nonlinear vibration analysis of the seismic isolation laminated rubber and seismic response was analyzed using a model of high-rise structure with the isolation rubber. Also, the modified bilinear method which is used widely is applied and compared with the analysis results of PFT-HYS method. In this result, it was found that PFT-HYS method can express the response of the structure. Moreover, based on the response analysis results of the PFT-HYS method, the hysteresis restoration force characteristics of the isolation rubber to minimize the response of the isolation structure were optimized. As a result, it was found that the optimal hysteresis force characteristics are different in the optimization result which minimizes the response displacement of the seismic isolation layer and the optimization result which minimizes the response acceleration of the top floor.