基础隔震密肋复合墙结构的地震随机响应分析  

Analysis of random earthquake responses of multi-ribbed composite structure with base isolation

作　　者：李云璋[1] 姚谦峰[1] 黄炜[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《世界地震工程》2010年第2期97-101,共5页World Earthquake Engineering

基　　金：国家自然科学基金项目(50578011)

摘　　要：在给出密肋复合墙结构弹性刚度的基础上,建立了基础隔震结构的运动方程,利用随机振动的理论,将地震波过滤白噪声地震动模型输入,运用状态空间法,得出了层间最大位移的概率统计特性,从而建立了其均值和均方差的计算公式。通过算例分析表明,增大上部结构自振频率与隔震结构的频率的比值可以增大隔震层最大位移的反应,提高隔震层的阻尼比可以降低隔震层最大位移的反应;对其参数进行合理的配置,可使该结构体系隔震效果达到最优。Based on the given equivalent elastic stiffness of multi-ribbed composite structure,the motion equations of a base isolation system are obtained.In accordance with the random vibration theory,the ground acceleration is described through the power spectral density function.Using the state space method,the statistical probabilistic characteristics of the maximum displacement response of the large bay multi-ribbed slab frame structure with base isolation are analyzed,and the calculating formula of displacement mean value and standard variation value are derived.The results of a calculation example indicate that the maximum displacement value of the isolation layer will increase with the increasing,the ratio of the first frequancy of upper structure to the frequency of isolation structure,and the maximum displacement value of the isolation layer will reduce as the damping ratio of the isolation layer increases.By rationally selecting parameters,the isolation effectiveness of the structure can be optimized.

关 键 词：密肋复合墙结构 基础隔震 状态空间法 随机反应 

分 类 号：TU202[建筑科学—建筑设计及理论] P315.966[天文地球—地震学]