藏式山地结构有限元模型修正及动力可靠度分析  

Finite element model updating and dynamic reliability analysis of Tibetan structure on the slope

作　　者：常鹏[1,2] 吴楠楠 王钊 杨娜[1] 白凡[1,2] Chang Peng;Wu Nannan;Wang Zhao;Yang Na;Bai Fan(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing's Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学结构风工程与城市风环境北京市重点实验室,北京100044

出　　处：《土木工程学报》2020年第6期13-20,41,共9页China Civil Engineering Journal

基　　金：国家自然科学基金(51878034);国家自然科学基金面上项目(51778045);高等学校学科创新引智计划(B13002)。

摘　　要：布达拉宫建筑群山地结构众多,其与平地结构在地震作用下的动力可靠度差异较大。对布达拉宫内典型藏式山地结构占堆康进行基于环境振动的动力特性测试,分析基础约束刚度-频率敏感域曲线,应用实测结果修正有限元模型。基于首超准则及泊松跨越假定提出改进的动力可靠度解法,将占堆康视为串联体系得到其体系可靠度,并得到基础约束刚度的变化对动力可靠度的影响规律。结果表明:动力测试结果为有限元模型的修正提供依据,藏式山地结构的基础约束刚度对结构基频影响显著,且存在敏感影响域。运用基于首超准则改进的动力可靠度方法计算动力可靠度时应合理估计基础约束刚度。The dynamic reliability of the normal structures on flat ground differs greatly from that of hillside structures.The tests on the dynamic characteristics of Zhanduikang in the Potala Palace,which is a typical Tibetan structure on the slope,were performed based on environmental vibration.The foundation restrained stiffness-frequency sensitive domain curve was analyzed,and then the test results were used to update the finite element model.Based on the first-excursion criterion and the Poisson spanning assumption,an improved dynamic reliability solution was proposed.Furthermore,the Zhanduikang was regarded as a series-connected system to obtain its system reliability,and the influence laws of foundation restrained stiffness change on dynamic reliability were obtained.The results show that the dynamic test provide basis for the updating of finite element model;the foundation restrained stiffness has a significant effect on fundamental frequency and there is a sensitive domain.The foundation restrained stiffness should be reasonably estimated when calculating dynamic reliability by the dynamic reliability solution based on the first-excursion criterion.

关 键 词：藏式山地结构 有限元模型修正 动力可靠度 首超准则 

分 类 号：TU363[建筑科学—结构工程]