叠层橡胶支座隔震结构地震响应的突变分析  

Catastrophic seismic response of isolated structure based on laminated rubber bearings

作　　者：刘海卿[1] 王学庆[1] 王锦力[1] 

机构地区：[1]辽宁工程技术大学土木建筑工程学院,辽宁阜新123000

出　　处：《地震工程与工程振动》2008年第2期158-164,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50678079);辽宁省教育厅科研基金项目(2004D245)

摘　　要：为全面分析地震破坏过程中由非线性引起的,如突变和滞后效应等某些复杂特性,本文在现有的动力分析模型基础上引入了非线性恢复力,并用突变理论分析方法对改进后的模型进行分析,结果表明叠层橡胶支座参数的微小变化使响应振幅及其突变值、振幅响应的不稳定区域等特性产生明显变化,反映出隔震结构的地震响应特性对参数变化非常敏感。由于支座阻尼的耗能作用,当阻尼较大或激振力、非线性参数较小时,地震响应的突变现象消失,产生"伪线性"特性。To analyze some complex behaviors such as catastrophe and lag caused by nonlinearity in the damaged isolated structure excited by earthquake, based on laminated rubber bearings （abbreviated to LRB ） , the existing dynamic analytic model is improved by inputting nonlinear restoring force, and it is analyzed with catastrophe theory. Analysis shows that small changes of LRB＇ s parameters may cause remarkable changes of amplitude, amplitude catastrophic value and unstable region of dynamic response of isolated structure. It means that the response behaviors of isolated structure are very sensitive to the variable LRB＇ s parameters. When the damping is larger and the exciting force and the parameter of nonlinearity are smaller, the catastrophic behavior of superstructure disappears and the pseudo-linear behavior exhibits.

关 键 词：叠层橡胶支座 非线性 地震响应 突变 伪线性 

分 类 号：TU352.1[建筑科学—结构工程] TU435