(1 同济大学建筑设计研究院，上海200092； 2 上海建筑设计研究院有限公司，200041)

［提要］复旦大学正大体育馆钢屋盖采用了拱-索-空间钢桁架的结构体系，受力复杂。利用ANSYS软件，较真实地模拟屋盖的边界条件和支座刚度的影响，分析了拉索的初始预拉力取值。对屋盖进行了动力特性、抗震性能及整体稳定性分析，结果表明，结构低阶振型以水平振型为主，拉索预拉力对结构的内力影响较小，结构具有较好的抗震性能。

［关键词］钢屋盖；结构设计；预拉力；动力分析；抗震性能；整体稳定性

Steel Roof Structure Design of Fudan Zhengda Gymnasium/Ding Jiemin¹,Shen Zhongxian²,Lu Xiuli¹,Yu Zhongjun¹(1 Architecture Design & Research Institute of Tongji University,Shanghai 200092,China; 2 Shanghai Institute of Architecture Design & Research Co.,Ltd.,Shanghai 200092,China)

Abstract:The arch,cable and spatial steel truss system is adopted in the roof structure of Fudan Zhengda gymansium.The ANSYS software is used to analyze the pretension of cable based on truly simulating the boundary condition and supporting rigidity.The vibration characteristic,seismic performance and integer stability of roof structure are analyzed.The calculation results show that the vibration characters low stage horizontal tremble.The pretension of the cable has little effect on the structure bearing capacity,and the structure has good seismic performance.

Keywords:steel roof; structure design; pretension; seismic performance; integer stability