基于响应面法的巨-子结构控制体系可靠性灵敏度分析  

Dynamic reliability sensitivity analysis ofmega-sub control system based on response surface method

作　　者：李祥秀[1] 谭平[2] 刘良坤[2] 张颖[2] 周福霖[1,2] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]广州大学工程抗震研究中心,广州510405

出　　处：《振动与冲击》2015年第16期104-108,共5页Journal of Vibration and Shock

基　　金：国家973项目(2011CB013606);国家基金委面上项目(51208129);国家教育部新世纪人才项目(NCET-11-0914);国家教育部博士点基金(20104410110002);广州市羊城学者科技计划项目(10A032D)

摘　　要：建立巨-子结构控制体系动力微分方程,利用复模态理论推导结构体系的传递函数。用响应面法获取极限状态函数,并基于随机振动首次超越破坏准则,分析结构体系动力可靠度计算方法;考虑地震随机激励,结构处于弹性状态时分析其随机参数对巨-子结构控制体系层间位移角的可靠性灵敏度。结果表明,基于层间位移角的可靠度对子结构刚度均值灵敏度较差,对主结构刚度及隔震层阻尼比均值灵敏度较强。The equations of motion of a mega-sub control system were established when the sub-structure was modeled as a multi-degree of freedom system. The transfer function of the system was derived by using the complex modal theory. The ultimate state function was obtained by using the response surface method and then on the basis of the first passage mechanism of random vibration, the calculation method of dynamic reliability of the system was analyzed. Finally, the reliability sensitivity of the random parameters of the structure to story drift angle was analyzed when the ground motion was considered as a random excitation and the structure was considered to be in elastic state. The results indicate that the mean stiffness of substructure has poor sensitivities to story drift angle, while the sensitivities of the mean stiffness of main structure and the damping ratio of isolation layer to story drift angle are high.

关 键 词：巨-子结构控制体系 响应面法 随机振动 动力可靠度 灵敏度 

分 类 号：TU352.1[建筑科学—结构工程]