基础组合隔震结构双向随机地震反应分析

Bidirectional Random Seismic Response Analysis of Base Combination Seismic Isolation Structure

利用有限元软件建立某5层框架结构商城模型,输入水平双向的实际地震波和人工波,通过时程分析,对比了传统抗震结构、全铅芯橡胶隔震结构和组合隔震结构的地震反应。结果表明:由铅芯橡胶支座和摩擦滑板支座组成的组合隔震结构在增加自振周期、减小基底反力幅值、减小结构层地震动加速度等方面均较全铅芯橡胶隔震结构更好,具有良好的隔震性能;考虑造价等因素,组合隔震结构比全铅芯橡胶隔震结构有更广阔的应用空间。

A 5-layer frame structure shopping mall model was constructed by use of finite element software,and the seismic response of the traditional frame structure, the full lead rubber isolation structure and the composite isolation structure are compared through time history analysis ＂after input two-way horizontal actual seismic wave ,artificial wave. The results show that the base composite isolation system composed of lead rubber bearing and frictional sliding plate bearing has good isolation performance and is better than the all lead rubber isolation bearing in increase the natural vi- bration period,reduce the base reaction force amplitude and reduce the seismic acceleration of structure layer. The composite isolation bearing has a wider application space than all lead rubber isolation bearing because of cost factors.