小型铅芯橡胶支座剪切性能试验研究  

Experimental research on shearing properties of small lead-core rubber bearings

作　　者：韩淼 刘祥辉 杜红凯 蒋金卫 杨杰川 HAN Miao;LIU Xiang-hui;DU Hong-kai;JIANG Jin-wei;YANG Jie-chuan(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044

出　　处：《振动工程学报》2024年第2期326-335,共10页Journal of Vibration Engineering

基　　金：国家重点研发计划资助项目(2019YFC1509500);北京建筑大学高精尖创新中心项目(UDC2019032424)。

摘　　要：通过对小型铅芯橡胶支座(LRB)进行剪切试验,研究了支座剪应变、压应力和加载频率对支座等效水平刚度、屈服后刚度、屈服力和等效阻尼比的影响。结果表明:随着剪应变的增大,支座的等效水平刚度和屈服后刚度减小,屈服力增大,等效阻尼比呈线性减小;随着竖向压应力的增大,支座的等效水平刚度减小,屈服后刚度呈线性减小,屈服力和等效阻尼比呈线性增大;加载频率对支座的剪切性能基本没有影响,可以忽略;100%剪应变以内,施加的剪应变和压应力没有对隔震支座造成损伤;剪应变超过100%的大变形和大压应力会使支座进入塑性,造成支座部分永久性损伤。建议根据振动台试验的工况顺序及支座在振动台试验的最大实际变形设计拟静力试验的工况。提出日本规范等效水平刚度计算公式的修正系数,并与振动台试验实测值进行对照,证明了修正后的计算公式计算精度有所提高。Through shear tests on small lead-core rubber bearings,the effects of bearing shear strain,compressive stress and load⁃ing frequency on the bearing's equivalent horizontal stiffness,post-yield stiffness,yield force and equivalent damping ratio are stud⁃ied.The results show that:With the increase of shear strain,the equivalent horizontal stiffness and the post-yield stiffness of the bearing decrease,the yield force increases,and the equivalent damping ratio decreases linearly;with the increase of the vertical compressive stress,the equal the effective horizontal stiffness decreases,the stiffness decreases linearly after yielding,and the yield force and the equivalent damping ratio increase linearly;the loading frequency has basically no effect on the shear performance of the bearing and can be ignored;within 100%of the shear strain,apply the shear strain and compressive stress did not cause dam⁃age to the isolation bearing;large deformation and large compressive stress above 100%shear strain will cause the bearing to enter into plastic,causing partial permanent damage to the bearing.Suggestions that the working conditions need to be designed accord⁃ing to the actual needs of the shaking table test are put forward.The correction coefficient of the Japanese code equivalent horizon⁃tal stiffness calculation formula is proposed,which is compared with the measured value of the shaking table test to improve the ac⁃curacy.

关 键 词：小型铅芯橡胶支座 剪应变 压应力 加载频率 振动台试验 

分 类 号：TU352.1[建筑科学—结构工程]