2008奥运羽毛球馆张弦网壳结构整体稳定分析中初始缺陷的影响研究

Influence of initial geometrical imperfections on stability of a suspendome for badminton arena for 2008 Olympic Games

工程结构的整体稳定性反映了结构的抗倒塌能力,是工程结构设计要考虑的关键问题,初始缺陷对不同类型结构的整体稳定性会产生不同的影响.目前在网壳结构设计中,初始缺陷是按照第一阶屈曲模态的L/300(L为结构跨度),对结构施加初始变形.本文以2008年奥运会羽毛球比赛馆的张弦网壳结构为工程背景,以两个不同形式的张弦网壳为算例,分析了初始缺陷对张弦网壳结构整体稳定性能的影响,对网壳结构设计中施加初始缺陷提出了新的看法,为实际工程的设计计算提供了借鉴和参考.

The structural global stability can reflect the resisting collapse ability of the structure and is a key point in structural design.In the analysis of global stability,for different structures,the different initial imperfection may result in different effects.At present,in the design of reticulated shells,the initial deformation of the first buckling mode(the dimension is L/300) of the structure is introduced as initial imperfection.In this paper,taking the suspend-dome structure optimization design of the gymnasium for Olympic badminton game in 2008 as the background,two different projects of suspend-dome were illustrated to analyze the effect of initial imperfection on structural global stability.New attitude of how to introduce initial imperfection in reticulated shells during structure design was advanced.Design guidelines were also given to refer for practical projects.