超高阻尼隔震橡胶支座力学性能温度相关性影响因素分析

Analysis of the Factors on Temperature Dependence of Behavior of SHDR

采用拟静力试验,分析不同水平应变、竖向压力、频率、内部橡胶G值以及不同温度加载顺序情况下SHDR支座水平性能的温度相关性,给出SHDR支座的各项水平力学性能指标(如屈服后刚度、屈服强度、单圈滞回面积、等效刚度及等效阻尼比等)温度相关性的影响程度,给出了除应变因素外相应拟合经验公式。研究结果表明:竖向压力、加载频率、支座内部橡胶G值和温度加载顺序对其影响较小,而应变影响较大;支座在常温下屈服后刚度及屈服强度随温度的增加而呈指数规律减少。

The method of repeated loading test was employed,some factors effect on the temperature dependency of SHDR,such as horizontal strain,vertical pressure,frequency,G value and sequence of temperature loading,were analyzed,the influence of the above factors on the post-yield stiffness,yield strength,hysteretic area of single loop,equivalent stiffness and equivalent damping ratio of SHDR was given,the corresponding formula except horizontal strain were given.The results show that,there is little effect for some factors,such as vertical pressure,loading frequency,G value and the sequence of temperature loading on the bearing,while the strain has a great influence.As a whole,the post-yield stiffness and yield strength of the bearing decrease exponentially with the increase of temperature at room temperature.