(北京市建筑设计研究院，100045)

［提要］北京2008年奥运会国家体育馆位于北京奥运中心区，是奥运中心区三大场馆(国家体育场、国家游泳馆和国家体育馆)中由中国设计单位独立完成的体育建筑。体育馆分为比赛馆和热身馆两部分，比赛馆区域屋顶跨度为114m×114m，采用了双向张弦空间网格结构，是目前世界上最大的双向张弦结构。主要介绍了体育馆的结构体系、设计标准、预应力控制、钢索更换以及防火计算等有关内容，另外还简要介绍了与设计有关的施工过程计算和试验研究。

［关键词］奥运工程；体育馆；双向张弦结构；预应力；防火设计；累计滑移；模型试验

Structural Design of Roof of National Gymnasium for 2008 Beijing Olympics/Qin Yang,Zhu Zhongyi,Ke Changhua,Qin Kai,Wang Yi(Beijing Institute of Architectural Design,Beijing 100045,China)

Abstract: National Gymnasium for 2008 Beijing Olympics is located in the central area of Beijing Olympic Park. It ranks among the three major stadiums (the other two are National Stadium and National Swimming Center) but is the only one designed independently by domestic designer. The Gymnasium consists of two parts: competition hall and training hall. The competition hall has a 114m×114m roof composed of bi-directional truss string spatial grid structure, the largest one of its kind in the world. This paper focuses on the structural system, design standard, pre－stress control, cable replacement and fire-preventing calculation as well as other design-related construction process calculations and experimental researches.

Keywords: Gymnasiums; Olympic Games; bi-directional truss string structure; pre-stress; fire-preventing design; cumulative sliding; model test