铅芯隔震橡胶支座关键抗震性能参数极低温效应试验研究  

Experimental study of key seismic performance parameters of lead rubber bearing isolator under extreme low-temperature effect

作　　者：陈忆前[1] 牛松山[1] 刘洋[1] 申光兴 彭伟 CHEN Yiqian;NIU Songshan;LIU Yang;SHEN Guangxing;PENG Wei(China Merchants Chongqing Communications Research&Design Institute Co.,Ltd.,Chongqing 400067,China;Chongqing Anji Construction&Reinforcement Engineering Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]重庆安济建设加固工程有限责任公司,重庆401120

出　　处：《四川建筑科学研究》2024年第5期20-27,73,共9页Sichuan Building Science

基　　金：重庆市自然科学基金项目(CSTB2023NSCQ-MSX0775)。

摘　　要：中国北方部分地区冬季易受到极寒气候的影响,研究铅芯隔震橡胶支座在此环境下的性能变化规律和规范适用性,对结构抗震安全性具有非常重要的意义。对3种不同形状的铅芯隔震橡胶支座,分别进行了不同温度(-60~40℃)和不同低温暴露时间(1、2、7 d)下的剪切性能试验,得出了支座的关键抗震性能参数(特征强度、水平等效刚度、屈服后刚度和等效阻尼比)随温度和低温暴露时间的变化规律。研究表明:支座形状对铅芯隔震橡胶支座的低温隔震性能影响较小;而橡胶配比在极低温时的影响至关重要;在满足各项性能需求的前提下,低温减隔震支座宜优先选择剪切模量较小的支座;支座的关键抗震性能参数在低温暴露时间约为2 d时达到一个相对稳定的状态。Considering that some regions in northern China are affected by extremely cold climates in winter,the study of performance changes and regulatory applicability of lead rubber bearing isolators in this environment is of great significance for the seismic safety of structures.The shear performance tests on three different shapes of lead rubber bearing isolators at different temperatures(-60-40℃),and different low temperature exposure time(1,2 and 7 d)were conducted.The change rule between key seismic performance parameters of bearings(characteristic strength,horizontal equivalent stiffness,post-yield stiffness and equivalent damping ratio)under different temperatures and different low temperature exposure time were obtained.Research has shown that the shape of the bearing has little effect on the low-temperature isolation performance of lead rubber bearing isolator.The influence of rubber ratio is crucial at extremely low temperatures.On the premise of meeting various performance requirements,low-temperature seismic isolation bearings should preferentially select bearings with smaller seismic modulus.The key seismic performance parameters of the bearing reach a relatively stable state after being exposed to low temperature for about 2 d.

关 键 词：铅芯隔震橡胶支座 力学特性 温度相关性 低温暴露时间 剪切性能试验 

分 类 号：TU352.12[建筑科学—结构工程]