大跨度空间结构抗震分析的非平稳随机振动时域显式法  

Non-stationary seismic analysis of large-span spatial structures by time-domain explicit method

作　　者：苏成[1] 徐瑞[2] 刘小璐[2] 廖旭钊[3] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [2]华南理工大学土木与交通学院,广东广州510641 [3]广东省建筑设计研究院,广东广州510010

出　　处：《建筑结构学报》2011年第11期169-176,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51078150);华南理工大学亚热带建筑科学国家重点实验室项目(2008ZC21)

摘　　要：大跨度空间结构自振频率高度密集,振型耦联作用明显,采用传统振型分解反应谱法计算结构地震响应时,存在振型组合数量大、组合方式不尽合理等问题。采用真正意义的随机振动方法计算大型复杂结构地震响应的需求越来越迫切。时域显式法基于动力响应显式表达式进行随机振动分析,具有良好的计算精度和计算效率,为大型复杂结构的随机振动分析提供了一条有效途径。以时域显式法为基础,在通用有限元软件平台上实现了大跨度空间结构在非平稳地震作用下的随机响应分析。以广州亚运会自行车馆抗震分析为工程应用实例,验证了时域显式法在大跨度空间结构抗震分析中的高效性;同时,计算结果还表明,相对于时域显式法的结果,传统反应谱法的计算结果偏于保守。The natural frequencies of large-span spatial structures are usually closely spaced,and the corresponding mode shapes are always highly coupled.A large number of mode shapes and a more reasonable combination rule between different modes are required when using the conventional response spectrum method（RSM） for seismic analysis of such structures.It is therefore in great demand to conduct seismic analysis of large complex structures by a real random vibration method.Based on the explicit expressions of dynamic responses,the time-domain explicit method（TDEM） has a good computational accuracy and efficiency for random vibration analysis.It offers an effective way for random vibration analysis of large and complex structures.Based on the framework of TDEM,random response analysis of large-span spatial structures subjected to non-stationary seismic excitations is accomplished by utilizing commercial finite element programs.Seismic analysis of the Guangzhou Cycling Gymnasium is conducted by TDEM,indicating the high efficiency of the present method.The results of TDEM are also compared with those obtained by RSM,showing that the latter tend to be conservative.

关 键 词：大跨度空间结构 非平稳随机激励 时域显式法 反应谱法 

分 类 号：TU393.3[建筑科学—结构工程] O324[理学—一般力学与力学基础]