金属橡胶桥梁支座剪切屈服后刚度研究  

Shear post-yield stiffness of metal rubber bridge bearings

作　　者：黎大玮 夏修身[1] 张永强 马健行 罗辉 LI Dawei;XIA Xiushen;ZHANG Yongqiang;MA Jianxing;LUO Hui(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《地震工程学报》2023年第2期355-361,共7页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(52068041);国家自然科学基金面上项目(52278186);兰州交通大学天佑创新团队(TY202007)。

摘　　要：基于重叠面积法与Haringx理论,得到圆形截面金属橡胶桥梁支座剪切屈服后刚度的计算公式,公式中剪切屈服后刚度与压应力及支座直径成正比,与支座高度成反比,并且存在待求系数α与β。通过大尺寸金属橡胶桥梁支座试件的压缩及压剪试验,获得剪切模量与压缩模量之间的关系,求得系数α约为1.3。参考剪切试验中压应力、支座直径、相对密度和形状系数对支座剪切屈服后刚度的影响规律,给出无量纲系数β的计算公式。根据待求系数α与β,对理论计算公式进行实用性简化,并比较屈服后刚度的理论计算结果与试验结果。结果表明:实用计算公式与试验结果吻合较好,且具有较好的精度,可用于金属橡胶支座压剪状态下屈服后刚度的计算。Based on the overlapping area method and Haring theory,the formula for the shear post-yield stiffness of metal rubber bridge bearings with a circular cross-section was obtained in this study.The shear post-yield stiffness in the formula is proportional to the compressive stress and the bearing diameter and inversely proportional to the bearing height,where two coefficientsαandβare to be determined.The relationship between the shear modulus and compression modulus of large-size metal rubber bridge bearing specimens was obtained through compression and compressive-shear tests,and coefficientαwas approximately 1.3.Referring to the influence law of compressive stress,bearing diameter,relative density,and shape factor on the shear post-yield stiffness of the bearing in the shear test,the formula of the dimensionless coefficientβwas evaluated.Furthermore,a practical simplification of the theoretical formulation was performed according to coefficientsαandβ,and the theoretical calculation results of the post-yield stiffness were compared with the experimental results.Results showed that the practical calculation formula,which agrees with the test results,is reasonably accurate.This formula can be used for the calculation of the post-yield stiffness of metal rubber bearings under compression-shear conditions.

关 键 词：桥梁支座 金属橡胶 屈服后刚度 重叠面积法 压剪试验 

分 类 号：U443.361[建筑科学—桥梁与隧道工程]