多点激励下圆柱面巨型网格结构地震响应分析

空间相关性对大跨度空间结构的影响不容忽视。本文采用动力时程分析方法对圆柱面巨型网格结构进行了多点激励下的地震响应分析,并与一致激励下的结构地震响应进行对比,探讨了主体结构单独承载和子结构参与协同承载这2种情况下,不同行波激励对结构关键节点和杆件响应的影响及其变化特点;通过比较分析结构在多点激励和一致激励下的响应差异,得出圆柱面巨型网格结构在地震输入时需考虑多点激励的结论,可供该类结构的抗震设计参考。

Seismic Responses of Cylindrical Reticulated Mega-structure under Multiple Support Excitations

In connection with the problem of the significant influence of spatial correlation on the long-span spatial structures,seismic response analyses of cylindrical reticulated mega-structure are made under multiple support excitations by using dynamic time-history method and compared with that under simple support excitations in this paper.The response and its variations of some key nodes and members in the structure are discussed under different traveling-wave excitations in the condition of the main structure bearing the loads by itself and cooperatively with substructures.Response differences between multiple support excitations and simple support excitations prove that the analyses of multiple support excitations of reticulated mega-structure are necessary under earthquake inputting,which provide theoretic references to the seismic design of such structures.