(北京市建筑设计研究院，100045)

［提要］国家奥体匹克体育中心体育场为一改扩建项目，始建于1989年，原为1990年亚运会主体育场，现为了满足2008年北京第29届奥运会现代五项比赛的各项要求而进行改扩建，改建后体育场的建筑面积和建筑高度均发生了很大变化。原结构体系采用钢筋混凝土框架，加固结构体系研究中，结合各种改造加固手段的可行性及经济性，采用PMSAP，SAP2000，ANSYS三种软件对比分析了钢筋混凝土框架及框架-剪力墙、钢筋混凝土框架-钢支撑及框架-耗能钢支撑四种结构体系，最终确定了钢筋混凝土框架-耗能钢支撑的结构体系。通过利用耗能器的减震作用，有效降低了结构的加固难度和加固量，增强了结构的整体抗侧刚度，这是一种经济、有效的新型加固方法。屋面采用型钢 拉索钢罩篷，预应力索的使用有效控制了屋面竖向变形，使外挑型钢梁强度可以充分发挥，达到强度和刚度双控的优化设计。

［关键词］体育场改造加固；减震耗能结构；钢结构；型钢；拉索钢罩篷

Rebuild and Extended Structural Design of the National Olympic Center Stadium/Qin Yang，Liu Lijie，Gao Pengfei，Geng Jin，Zong Hai(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract: In order to meet the modern pentathlon demand of the 2008 29th Olympic Games held in Beijing, the National Olympic Center Stadium built in 1989  needs rebuild and RC extended construction. Both of the construction area and height are enlarged greatly for the stadium. Considering the feasibility and economy, four structure styles were studied during the course of design, they are reinforced concrete frame structure, frame-shear wall structure, concrete frame with steel braced structure and frame with damping and energy dissipission steel braced structure. Finally concrete frame with damping and enerty dissipission steel braced structure was adopted. With the use of damping absober, both the difficulty and quantity of the strengthening were decreased, and the lateral stiffness of the structure was strengthened. Cabled steel frame structure was used in the roof, the vertical distortion was effectively controlled and the strength of the spread out steel beam was used fully by the use of prestressed cable, the best design was achieved by the control of strength and stiffness.The analysis softwares PMSAP, SAP2000 and ANSYS were used during the design.

Keywords: stadium rebuild and strengthen; damping and energy dissipation structure;

steel structure; steel frame-cabled shed