近场地震动对基础隔震结构的影响  

Research on Isolated Structures on Near-field Ground Motions

作　　者：殷伟希[1] 李云华[1] 

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《广东土木与建筑》2009年第10期16-18,43,共4页Guangdong Architecture Civil Engineering

摘　　要：选用宽频远场地震Kanai-Tajimi模型与He-Agrawal近场脉冲地震速度脉冲模型,对现有的典型近场地震记录进行非线性数值拟合,调整其脉冲分量与宽频分量的比值,得到不同脉冲分量的地震波;文中以一幢8层基础隔震结构为研究对象,分析了合成近场地震波下基础隔震结构的水平及转动动力响应,结果表明含有脉冲分量的近场地震动比远场地震动破坏力更大;基础隔震体系能有效地减小上部结构在近场地震动中的响应。In this paper,Kanai-Tajimi model and He-Agrawal velocity pulse model are selected to conduct the nonlinear numerical simulation of several typical near-filed records,and many near-field ground motions are obtained by adjusting the ratio of random broadband component and pulse component. In this study,a typical structure of eight floors is used as an object,then analyzing the dynamic responses of the isolated structure. Results show that the destructivity is more serious in near-field ground motion than that of far-field ground motion; and the base isolation system can reduce the seismic responses of the superstructure effectively.

关 键 词：基础隔震结构 近场地震动 宽屏分量 脉冲分量 

分 类 号：TU352.12[建筑科学—结构工程] P315[天文地球—地震学]