振动台模拟高层隔震结构多维地震反应的试验

目的为高层隔震结构设计理论和规范的编制提供试验依据．方法对缩尺为1：16两向高宽比分别为2．5和5的橡胶垫隔震结构模型进行三向地震动输入振动台试验．通过输入不同大小和类型的地震波，分析观察模型上部结构和隔震支座的地震反应．结果结构在小高宽比方向基本做刚体运动，大高宽比方向在强震时变形以第一振型为主，并有高阶振型的参与；在某些工况下，隔震支座竖向进入非线性受拉屈服状态；三向地震动发生时刻接近时，隔震支座水平面内产生最大变形．结论隔震上部结构减震效果较好；需特．别注意水平两向地震波峰值接近的情况；在某些不利地震动下，隔震支座进入受拉屈服状态，此时结构是不安全的

Experimental Research on Shaking Table for Simulating Multidimensional Earthquake Responses of High-Rise Isolated Structure

At present,isolation technology,which is applied to high-rise buildings,has markedly reduced the structure cost and improved the earthquake-resistant performance.In the paper,experimental research on shaking table used for simulating multidimensional earthquake responses of high-rise isolated structure has been conducted.The model is with lead-plug rubber bearing in height-width ratio 2.5 and 5 on a scale down of 1:16.Earthquake responses of isolated top structure and isolation bearing have been analyzed with the input of the earthquake waves of different magnitudes and types.Experimental result shows that isolated top structure has good vibration reduction effect and the vertical stiffness of rubber bearings is into nonlinear tension conduction in some cases.Here rubber bearing might is drawn into bucking and the isolation structure is unsafe.It also turns out that isolation bearing will cause maximal distortion in horizontal plane when peak value time of three-direction earthquake waves is adjacent.The analyses of correlative date can provide experimental basis for design theory and standard program of high-rise isolation structure.