厚层铅芯橡胶支座的剪压极限性能试验分析  

Experimental study and analysis on vertical ultimate properties of thick lead-rubber bearings

作　　者：杜海玥 朱玉华[1] 卢文胜[1] 何毅 DU Haiyue;ZHU Yuhua;LU Wensheng;HE Yi(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》2022年第3期153-162,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51578411,51638012);同济大学科技专项(0200219251)。

摘　　要：厚层铅芯橡胶支座的剪压极限性能是影响竖向隔震性能及支座稳定性的关键因素。文中设计了不同单层橡胶厚度、不同形状系数的四组橡胶支座,进行竖向纯压和剪压条件下的支座试验,研究支座的剪压极限受力性能变化规律。结果表明,纯压下支座第一形状系数较大的橡胶支座经过强化达到受压极限状态,剪压下支座的剪压极限应力随剪应变的增大而明显减小。对试验支座进行有限元模拟,纯压下有限元结果与实验结果吻合较好。通过研究规范公式,发现现行规范公式过于保守的估计了厚层铅芯橡胶支座的剪压极限破坏应力,经过试验和有限元结果拟合后,提出适合厚层橡胶支座的修正公式。The shear compression limit performance of thick lead rubber bearing is the key factor affecting the vertical isolation performance and bearing stability.In this paper,four groups of rubber bearings with different thickness and shape coefficient of single rubber layer were designed,and the bearing tests under vertical pure compression and shear compression are carried out to study the variation rule of ultimate mechanical performance of the bearings.The results show that when the first shape factor of the bearing is large,the rubber bearing reaches the compression limit state after strengthening,and the ultimate stress of the bearing decreases with the increase of shear strain.The finite element simulation of the test bearing is carried out,and the results of the test and the finite element are compared.It is found that the finite element results are in good agreement with the experimental results.Through the study of the code formula,it is found that the current code formula is too conservative to estimate the ultimate failure stress of thick layer lead rubber bearing.After the fitting of the test and finite element results,the code formula is modified,which is suitable for thick layer rubber bearing.

关 键 词：厚层铅芯橡胶支座 支座性能试验 有限元模拟 剪压极限性能 修正公式 

分 类 号：TU352.1[建筑科学—结构工程]