铅芯橡胶支座单元模型的开发及验证  

Development and verification of element model for lead-rubber bearings

作　　者：周通 李爱群[1,2,3] 

机构地区：[1]东南大学土木工程学院,南京210096 [2]北京未来城市设计高精尖创新中心,北京100044 [3]北京建筑大学土木与交通工程学院,北京100044

出　　处：《东南大学学报（自然科学版）》2017年第6期1154-1160,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重点资助项目(51438002);国家自然科学基金资助项目(51278104)

摘　　要：为了提高铅芯橡胶支座力学性能计算分析的准确性和效率,基于Open Sees有限元程序开发了相应的单元模型,综合考虑了支座双向耦合行为和圆形截面各向同性的特点,并计入压缩刚度、临界承载力随侧移的变化效应以及加载历程对于支座拉伸方向累积损伤、强度退化等性能的影响.为验证单元模型的有效性,分别针对水平双向位移控制试验、静力循环拉伸试验及隔震桥梁动力试验进行了模拟分析.结果表明,所提模型能够较为合理地模拟支座的力学特性,在单元内部考虑支座力学性能的变化效应可以较为准确地反映其在地震动作用下的响应表现,为进一步开展隔震结构地震响应分析奠定基础.To improve the accuracy and the efficiency of mechanical property calculations and analyses of lead-rubber bearings,the corresponding element model is proposed based on the OpenSees program.This model accounts for the coupled bidirectional response and the isotropic behavior of circular bearings.Furthermore,the variation of the compression stiffness and the critical load with the change of lateral displacement and the effects of the loading history on the cumulative damage and cavitation strength reduction in the tensile direction of bearings are considered.To validate the effectiveness of this element model,simulation analyses are conducted for the bi-directional displacementcontrolled tests,the cyclic tensile load tests and the steel-truss isolated bridge dynamic tests,respectively.The results show that this numerical model can reasonably simulate the mechanical behaviors of bearings.The response performance of the bearings under earthquake ground motions can be described accurately by considering the variation of the bearings' mechanical characteristics.The proposed model provides a foundation for further investigation of the response analyses on seismic isolated structures.

关 键 词：铅芯橡胶支座 水平双向耦合 竖向压缩刚度 验证 

分 类 号：TU352.1[建筑科学—结构工程]