铅芯对厚层铅芯橡胶支座竖向力学性能的影响  

Effect of lead core on vertical mechanical properties of thick lead rubber bearings

作　　者：江秋琪 朱玉华[1] 卢文胜[1] JIANG Qiuqi;ZHU Yuhua;LU Wensheng(College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《地震工程与工程振动》2023年第6期84-92,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51638012,51578411)。

摘　　要：厚层铅芯橡胶支座具有同时隔离水平地震动和竖向地震动的三维隔震性能,其竖向刚度是影响厚层橡胶支座竖向隔震性能的关键因素。基于厚层铅芯橡胶支座三维有限元模型,研究铅芯对厚层铅芯橡胶支座竖向刚度的影响,模型分析中考虑铅芯与周边边界的不同约束情况,研究铅芯的边界约束条件对支座竖向刚度的影响,分析结果表明,铅芯单元边界约束考虑法向可分离、切向可滑移且边界接触摩擦系数取0.9时较为符合支座实际情况。研究了铅芯直径对支座竖向刚度的影响,结果表明,铅芯对支座竖向刚度的贡献除铅芯材料自身刚度及其边界约束条件外,尚应考虑铅芯直径的影响。同时进行了支座性能试验,通过有限元分析结果与试验结果的比较,验证有限元分析方法的有效性及铅芯边界约束条件定义的合理性。The thick lead rubber bearing has the three-dimensional seismic isolation performance of isolating both horizontal and vertical ground motions at the same time.Its vertical stiffness is the key factor affecting the vertical isolation performance of the thick lead rubber bearing.Based on the finite element analysis,this paper studies the effect of lead core on the vertical stiffness of thick rubber bearings.In the model analysis,the constraint between lead core and its boundary is considered,and the influence of different constraint conditions of lead core on the vertical stiffness of bearing is studied.The analysis results show that the boundary constraint of lead core element is in line with the actual situation when normally separable and tangential friction coefficient is defined as 0.9.The influence of the diameter of lead core on the vertical stiffness of bearing is studied.The results show that the contribution of lead core to the vertical stiffness of bearing should not only take the stiffness of lead core itself and its boundary constraints into consideration,but also the influence of the diameter of lead core.Meanwhile,the bearing performance test is carried out,and the effectiveness of the finite element analysis method is proved by comparing the finite element analysis results with the test results.

关 键 词：厚层铅芯橡胶支座 有限元分析 铅芯单元边界约束 铅芯直径 竖向力学性能 

分 类 号：TU352.1[建筑科学—结构工程]