大跨空间网壳结构竖向及水平地震响应分析

为了能够有效地控制空间网壳结构在地震荷载作用下的振动,对平面直径为80m的单层球面网壳结构动力特性进行了分析。通过现行设计规范的反应谱曲线,利用完全二次组合法进行反应谱组合,对计算模型分别进行了竖向地震和水平地震响应的分析,分别计算统计了网壳结构的地震节点位移响应和杆件单元的内力。计算结果表明,大跨空间网壳结构竖向和水平地震响应存在较大的差异,在振动控制中应该进行同时控制,也为网壳结构的抗震设计和振动控制措施提供一定的参考依据。

Vertical and Horizontal Seismic Response Analyses of Long-span and Single-layer Spherical Lattice Shell Structure

The dynamic characteristics of 80 m single-layer spherical lattice shell structure are analyzed to control its vibration under seismic load.Through the response spectrum curve of current design specification,the analyses for the vertical and horizontal seismic responses of the single-layer spherical lattice shell structure are made by CQC,and the displacement response of the nodes and internal force of the rods unit are calculated respectively.The calculation results show that the vertical and horizontal seismic responses of the long-span lattice shell structure are in great difference,and should be performed in vibration control at the same time,which could provide certain references for the seismic design and vibration control of single-layer spherical lattice shell structure.