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研究极低气温(-40℃)下温度变化对隔震结构中铅芯橡胶支座力学性能的影响及其力学性能变化特征,及﹣40℃至40℃区间支座的温度相关性。选用直径为600 mm的原型铅芯橡胶支座,采用电液伺服加载系统完成剪切应变为100%情况不同恒定温度下的低周反复加载试验。发现支座在极低温度下的力学性能与常温下的力学性能差异显著。提出铅芯橡胶支座屈服后刚度与屈服荷载的温度修正方程,及隔震结构设计中铅芯橡胶支座基于温度的力学参数取值建议。给出考虑温度影响的隔震结构地震反应影响算例,分析结果表明温度对强震下隔震结构的隔震层位移、上部结构层间剪力以及上部结构顶层的加速度响应影响显著。
The effect of temperature change at low temperature (-40 ℃) on the mechanical properties of lead-rubber bearings in isolated structures and their mechanical properties were studied, and the temperature dependence of the supports at -40 ℃ to 40 ℃ was studied. Select the diameter of 600 mm prototype lead-rubber bearings, the use of electro-hydraulic servo loading system to complete the shear strain of 100% under different conditions of constant temperature low cycle repeated loading test. It is found that the mechanical properties of the support at very low temperatures differ significantly from those at room temperature. The temperature correction equation of post-yield stiffness and yield load of lead-rubber bearing is proposed, and the temperature-based mechanical parameters of lead-rubber bearing in isolation structure design are proposed. The influence of temperature on the seismic response of the isolated structure is given. The results show that the temperature has a significant influence on the displacement of the isolated structure, the interlaminar shear force of the superstructure and the acceleration response of the superstructure.