丁生根，汪大绥，高  超，方  卫，张伟育，王  荣
(现代设计集团华东建筑设计研究院有限公司，上海200002)

[摘要] 世博轴及地下综合体工程是2010年上海世博会园区标志性建筑，其屋顶体系由索膜顶棚结构和阳光谷钢结构组成。文章分别介绍了索膜顶棚结构和阳光谷钢结构各自的结构特点。对索膜结构，阐述了设计中膜材的安全系数取值、风荷载取值、膜面应力位移分析、防连续倒塌分析及地震作用的考虑等内容；对阳光谷钢结构，阐述了其整体受力、变形特点、节点设计特点。得出了作为大跨度柔性张拉结构的索膜顶棚和大跨度单层网壳结构的阳光谷均满足设计要求的结论。
[关键词] 世博轴；索膜结构；阳光谷；非线性；倒塌分析；整体稳定

Structural Design of Cable-Membrane Roof and Sun Valley Steel Structure for Expo Axis Project
Ding Shenggen, Wang Dasui, Gao Chao, Fang Wei, Zhang Weiyu, Wang Rong
( East China Architectural Design & Research Institute Co.,  Ltd. , Xian Dai Architectural Design Group, Shanghai 200002, China)

Abstract: The project Expo Axis and its underground multi system is the landmark building of Expo Shanghai 2010. Its roof system is composed of cable-membrane structure and Sun Valley steel structure. This paper provides a brief introduction on structural features of the membrane structure and the steel structure respectively. For the merubrane structure, topics on safety factor of membrane materials, determination of wind loading, stresses and displacements, failure analysis and earthquake effects are discussed. For the Sun Valley steel structure, the overall structural behavior including intemal forces and deformations and the design of nodal joints are introduced, and the effect of single member buckling on overall structural stability is also presented. It is proved that the long-span flexible tensile membrane roof and the single layer latticed shells of Sun Valleys all meet the design requirements.
Keywords: Expo axis; membrane structures; Sun Valley; nonlinear, failure analysis; overall stability behavior