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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。
The different determining methods of bearing mechanical performance parameters in lead-rubber bearing test were compared. Considering the influence of temperature effect on the yield stress of bearing lead, the bilinear bearing model was used to compare the influence of lead temperature before and after Based on this, a large number of seismic records were used to analyze the effect of the temperature dependence of the lead core on the mechanical properties and the seismic response of the isolated bearings. The results show that the plasticity of the lead along with the plastic deformation The dissipation temperature of seismic energy keeps changing. The yield stress of the lead under three different kinds of field waves shows a decreasing trend with the input of ground motion. For the medium-hard soil and bedrock sites, the domestic standard of lead yield stress The value is smaller than the actual value, which leads to overestimation of the displacement response of the bearing and underestimation of the shearing response of the bearing. Therefore, the true seismic response of the bearing and structure under earthquake can not be effectively predicted.