考虑温度相关性的LRB隔震桥梁地震响应分析  

Seismic response of isolated bridges considering temperature effect

作　　者：胡紫东[1,2] 李黎[1,2] 聂肃非[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430074 [2]华中科技大学控制结构湖北省重点实验室,武汉430074

出　　处：《振动与冲击》2011年第9期40-45,共6页Journal of Vibration and Shock

基　　金：国家电网公司科技项目(SGKJ[2007]413);国家自然科学基金资助项目(50878093)

摘　　要：系统地研究了铅芯橡胶隔震支座的温度相关性,以及支座温度相关性对隔震桥梁地震响应的影响。试验温度的变化范围为-40℃至50℃,通过拟静力试验的滞回曲线测定了支座在不同温度下的屈前刚度、屈后刚度和屈服剪力。根据所测得的试验数据,采用回归分析,得出了支座的温度影响相关系数函数。建立了LRB隔震桥梁的力学模型,分析了考虑支座温度相关性对隔震桥梁地震响应的影响。比较了不同温度下支座滞回的计算结果。对比分析了不同温度下,隔震梁桥墩顶剪力、梁位移和梁加速度的计算结果,得出了若不考虑支座的温度效应墩顶剪力和梁加速度会有较大的误差,而温度效应对梁位移影响较小的结论。The temperature properties of LRB used in isolated bridges were studied.The seismic response of isolated bridges considering temperature effect were focused.The range of temperature is from-40℃ to 50℃ and the characteristics of LRB under different temperature environmental conditions were measured through quasi-static testing.Based on experimental results and using regression analysis,the correlation function between LRB and temperature was derived.A numerical model of isolated bridges under seismic excitation taking into account the effect of LRB was presented.From the comparative analysis of the results of pier shear,deck drift and deck acceleration,it is indicated that if temperature effect is unconsidered,higher deviation will take place in the results of pier shear and deck acceleration,nevertheless,deck drift is of less influence.

关 键 词：LRB 温度相关性 试验 地震响应分析 

分 类 号：TU352.1[建筑科学—结构工程]