余志伟，  朱  莹，  花更生，  周建龙
    (现代设计集团华东建筑设计研究院有限公司，上海200002)

[摘要] 上海世博演艺中心上部主体主要由长悬臂桁架和内框架组成。考虑到该结构的重要性和特殊性，分别进行了有楼板刚度、无楼板刚度及单榀框架的计算，确保结构的安全。采用振型分解反应谱法分析了结构的抗震性能，并补充了罕遇地震下的静力弹塑性分析。对关键构件的设计，阐述了方案比选的过程。对复杂节点，进行了有限元弹塑性分析。通过精心的结构设计，达到了建筑功能与结构形式的完美统一。
[关键词] 长悬臂桁架；楼板刚度；空间效应；环向拉力

Design of the Main Structure of Shanghai World Expo Performance Arts Center
Yu Zhiwei, Zhu Ying, Hua Gengsheng, Zhou Jianlong
( East China Architectural Design & Research Institute Co.,  Ltd. , Xian Dai Architectural Design Group, Shanghai 200002, China)

Abstract: The main structure of Shanghai World Expo Performance Arts Center consists of long-cantilever truss and inner frame. Due to the importance and specialty of the structure, three models of "with real floor stiffness, without floor stiffness and only single frames" were respectively calculated to ensure structural safety. Response spectrum method was adopted to analyze the structural seismic performance, and Pushover analysis was taken in rare earthquake case. Scheme comparison of the key structural member was introduced and complex nodes were emphasized with finite element analysis. Through elaborate structural design, the building's architectural function and structural form come into a perfect unity.
Key words: long-cantilever truss; floor stiffness; integral effect; circumferential tensile force