2008奥运羽毛球馆新型预应力弦支穹顶结构动力特性及地震响应分析

RESEARCH ON DYNAMIC CHARACTERISTICS AND SEISMIC RESPONSE OF THE NEW SUSPEND-DOME STRUCTURE OF BADMINTON GYMNASIUM FOR 2008 OLYMPIC GAMES

奥运羽毛球馆弦支穹顶直径93m,为目前世界跨度最大的弦支穹顶结构。对其建立有限元模型,进行动力特性分析,提取结构前60阶自振频率和模态振型得出,结构模态频率密集,振型以中间张弦穹顶竖向振动为主等特点;合理选取地震波对结构进行水平和竖向地震时程分析,提取结构上部网壳与下部索杆在地震作用下的动内力变化数值,并与反应谱法结果进行比较,得出结构径向杆件地震动反应最大,水平向地震起控制作用等特点,可为相关结构的抗震设计提供参考。

The steel roof suspend-dome structure of the badminton gymnasium is the maximal suspend dome structure in China by now, the maximal diameter of it is 93 meter. A finite element model of the structure is set up and the analysis and research on the dynamic characteristics of the structure are done; the forward 60 natural frequency of vibration is extracted, and then it is concluded that the model has closely distributed modes, more vertical modes and many symmetrical modes. A proper seismic wave is chosen to make seismic time history analysis on horizontal direction and vertical direction, themoving inner force of the whole structure is obtained and the results are compared with those of the response spectrum method. It is also concluded that the radial braces and members have maximal response in seismic action and horizontal seism has a control action , etc. Which may be a reference for project seismic design.