串联隔震系统水平刚度及对结构地震响应影响  

Horizontal stiffness of laminated rubber bearing serially connected with column and its effects on seismic response of isolated structure

作　　者：杜永峰[1,2] 朱前坤[1] 李慧[2] 

机构地区：[1]兰州理工大学防震减灾研究所,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《振动与冲击》2011年第11期21-24,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金(50778087);国家自然科学基金(50978130)

摘　　要：针对工程界比较关注的柱串联隔震系统的水平刚度问题,建立了水平刚度计算公式,探讨了压应力对水平刚度及结构地震响应的影响。首先建立了单个叠层橡胶支座的场矩阵;其次根据传递矩阵法建立了柱串联隔震系统的场矩阵,根据所得场矩阵推导出串联隔震系统顶部状态变量与任意截面内力和位移之间的关系,进而推导出串联隔震系统的水平刚度计算公式,避免了繁琐的力学推导过程;最后探讨了压应力对水平刚度及结构地震响应的影响。结果表明水平刚度随着压应力的增大而减少,近断层附近建议采用隔震支座直接固定在基础上的隔震方案。The calculation formula for horizontal stiffness of laminated rubber bearing serially connected with column,in concerned engineering field,was put forward and the compressive stress influences on horizontal stiffness and dynamic response of isolated structure were investigated.The field matrix of single laminated rubber bearing was provided and then the field matrix of laminated rubber bearing serially connected with column was established.The relation between internal force and displacement at arbitrary cross section and the state variables at the top of bearing were obtained and the horizontal stiffness expression based on transfer matrix method were derived,avoiding tedious mechanical derivation.Finally,compressive stress influences on horizontal stiffness and seismic response of isolated structure were investigated.The results show that the horizontal stiffness decreases with the rise of compressive stress.The isolation scheme consisting of laminated rubber bearings directly fixed on foundation in the neighborhood of fault area was suggested.

关 键 词：柱串联隔震体系 传递矩阵法 水平刚度 压应力 地震响应 

分 类 号：TU352.1[建筑科学—结构工程]