考虑铅芯温度效应的橡胶支座参数影响分析

发布时间：2018-12-28 12:26

【摘要】：对铅芯橡胶支座试验中支座力学性能参数的不同确定方法进行比较,并考虑温度效应对支座铅芯屈服应力影响,采用修正双线性支座模型比较了考虑铅芯温度效应前后支座的累积塑性变形需求,在此基础上选用多条地震动实测记录分析铅芯温度效应对隔震支座力学性能和地震响应的影响,结果表明地震作用下铅芯随着塑性变形的累积和地震能量的耗散温度不断变化,三组不同场地波作用下铅芯屈服应力随着地震动输入的增大均呈现下降趋势,对于中硬土和基岩场地,铅芯屈服应力的国内规范取值较实际计算值偏小,导致支座位移响应的高估和支座剪力响应的低估,不能有效预测地震作用下隔震支座及结构真实地震响应。
[Abstract]:The different determination methods of mechanical properties parameters of lead rubber bearing are compared, and the effect of temperature on lead core yield stress is considered. Based on the modified bilinear support model, the cumulative plastic deformation requirements of the bearing before and after considering the lead temperature effect are compared. On this basis, the effects of lead temperature effect on the mechanical properties and seismic response of the isolation bearing are analyzed by using a number of measured ground motion records. The results show that the lead core changes continuously with the accumulation of plastic deformation and the dissipation temperature of earthquake energy under earthquake action. Under the action of three groups of different site waves, the lead core yield stress decreases with the increase of ground motion input, and the domestic criterion value of lead core yield stress is smaller than the actual calculated value for medium hard soil and bedrock site. Because of the overestimation of the displacement response of the bearing and the underestimation of the shear response of the bearing, it can not effectively predict the real seismic response of the isolated bearing and the structure under the earthquake action.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金(51278291;51478257) 高等学校博士学科点专项科研基金(20133108110024)
【分类号】：TU352.12

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