修正双线性模型对隔震结构地震响应影响的研究  

Study on the effect of modified bilinear model on seismic response of isolated structures

作　　者：金建敏[1] 谭平[1] 周福霖[1] 朱健[2] 黄襄云[1] 庄学真[1] 

机构地区：[1]广州大学工程抗震研究中心,广东广州510405 [2]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《西安建筑科技大学学报（自然科学版）》2016年第2期183-187 194,194,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51468050);广东省高等学校优秀青年教师培养计划基金资助项目(YQ2015124);国家自然科学基金重大研究计划基金资助(97315301-07)

摘　　要：铅芯橡胶支座的水平力学性能指标受到剪切应变的影响(剪应变相关性),剪应变相关性必然影响到隔震结构地震响应的计算结果。基于不同规格铅芯橡胶支座(直径700 mm、1 000 mm、1 100 mm)的剪应变相关性压剪试验,对考虑剪应变相关性的屈服后刚度及屈服力修正公式进行了验证。分别采用双线性与修正双线性恢复力模型模拟铅芯橡胶支座,对单质点及多质点的隔震结构模型进行时程分析;通过计算和对比,研究了采用两种双线性模型的地震响应差异。结果表明:采用双线性模型基本能够满足要求,但当地震波加速度峰值或铅芯橡胶支座剪切应变较小时,存在较大误差.The horizontal mechanical properties of lead rubber bearing are affected by shear strain(shear strain dependency).Shear strain dependency inevitably influences the calculation results of the seismic response of isolated structures.Based on the compression-shear tests of LRBs of different specifications(diameter 700 mm,1 000 mm,1 100 mm),the shear strain correlation formula of post yield stiffness and yielding load is verified.by using of the bilinear model and modified bilinear model to simulate LRB,the time history analysis of single-particle and multi-particle isolated structure model is performed.with two types bilinear model used,the differences of the seismic responses of isolated structures are studied by numerical analysis and comparison.The results show that the bilinear model of the LRB can basically meet the design requirements,but there is a significant error when the peak acceleration of seismic wave or the shear strain of lead rubber bearing is small.

关 键 词：铅芯橡胶支座 剪应变相关性 压剪试验 修正双线性恢复力模型 地震响应 

分 类 号：TU352.12[建筑科学—结构工程]