An Evaluation Study of Base Isolated System for Effective Reduction of Response Displacement in Isolated Story

基础隔震结构是降低地震反应加速度的有效体系，但会产生较大的反应位移。因此，隔震层必须有足够大的净空，在极端强烈的地震或包含长周期振动分量的地面运动作用下，可能会产生过大的反应位移。本研究的目的在于发展一种能有效降低反应位移及控制反应加速度的基础隔震系统。根据本文的研究结果，提出了一种简单有效的半主动控制方法，该方法仅基于隔震层内的反应位移值，而简单的摩擦阻尼器仅在反应位移过大的情况下起作用。

Base isolated structures are effective system for reduction of seismic response acceleration, but large response displacement occurs. Therefore enough wide clearance in isolated story must be required, and too large response displacement may occur by extreme severe earthquakes or ground motions including long period vibration components. The purpose of this study is to develop the base isolation system with effective reduction of response displacement and control of response acceleration. By the results of this study, effective and simple semi-active control method based on the response displacement values in isolated story only, and simple friction damper with joint mechanism that works only in case of too large response displacement, are proposed.