振动台试验用小尺寸普通叠层橡胶支座性能试验研究  

Experimental study of the performance of small size common laminated rubber bearings for shaking table test

作　　者：韩淼[1] 杨杰川 杜红凯[1] 蒋金卫[1] 刘祥辉 Han Miao;Yang Jie-chuan;Du Hong-kai;Jiang Jin-wei;Liu Xiang-hui(Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学,北京100044

出　　处：《工程抗震与加固改造》2023年第3期67-75,共9页Earthquake Resistant Engineering and Retrofitting

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

摘　　要：为研究振动台模型试验用小尺寸普通叠层橡胶支座力学性能,设计完成静力试验和振动台试验,分析加载频率、剪应变、压应力以及振动台模拟不同地震动对小尺寸普通叠层橡胶支座水平等效刚度和等效阻尼比的影响。试验数据表明,静力试验下,加载频率在0.02~0.3Hz内变化时,对支座性能影响较小;剪应变由10%增大至250%,水平等效刚度减小,等效阻尼比先降低后趋于基本稳定,剪应变大于100%后,支座性能会发生改变;压应力由0.5σ0增大至2.5σ0,小尺寸普通叠层橡胶支座水平等效刚度呈减小趋势,等效阻尼比呈增大趋势且幅度较大;动力试验下,在弹性范围内,支座水平等效刚度和等效阻尼比随剪应变的增大线性下降,与静力试验数据结果有一定差异,说明直接使用静力试验的数据结果来预估实际小尺寸支座的性能是不准确的。To study the mechanical properties of small size common laminated rubber bearings for shaking table test,static test and shaking table test are designed,and the effects of loading frequency,shear strain,compressive stress and shaking table simulation of different ground motions on the horizontal equivalent stiffness and equivalent damping ratio of small size common laminated rubber bearings are analyzed.The experimental data show that under the static test,when the loading frequency changes within 0.02Hz-0.3Hz,it has little influence on the bearing performance;when the shear strain increases from 10%to 250%,the horizontal equivalent stiffness decreases,the equivalent damping ratio first decreases and then tends to be basically stable,when the shear strain exceeds 100%,the bearing performance will change;when the compressive stress increases from 0.500 to 2.500,the horizontal equivalent stiffness of small size common laminated rubber bearings decreases,and the equivalent damping ratio increases.Under the dynamic test,in the elastic range,the horizontal equivalent stiffness and equivalent damping ratio of the bearing linearly decrease with the increase of shear strain,which is somewhat different from the results of the static test,indicating that it is inaccurate to directly use the data of the static test to predict the actual small size bearing performance.

关 键 词：小尺寸橡胶支座 剪应变 压应力 加载频率 静力试验 振动台试验 

分 类 号：TU317.1[建筑科学—结构工程]