(同济大学建筑设计研究院(集团)有限公司，上海200092)

［摘要］世博会城市最佳实践区C-1场馆系大悬挑、大跨度结构。通过与框架-型钢混凝土桁架结构的对比分析，验证了选择框架-剪力墙-型钢混凝土桁架结构体系的合理性及在大悬挑、大跨度结构的适当部位设置剪力墙的必要性，其在抵抗水平力的同时还起调控结构弹性扭转位移比和构件挠度的作用。运用SAP2000有限元程序对型钢混凝土桁架进行设计和分析，解决了结构大悬挑、大跨度难题；又通过在弦杆、桁架端部剪力墙适当部位施加预应力，很好地解决了弦杆、剪力墙所受轴向拉力过大、不能满足抗裂要求的问题。

［关键词］大悬挑；大跨度；剪力墙；型钢混凝土桁架；预应力弦杆；截面设计；节点设计

中图分类号：TU378.6，TU318文献标识码：A文章编号：1002-848X(2011)02-0089-05

Design and analysis on large cantilever structure of the C-1 Pavilion

in Urban Best Practice Area of Shanghai Expo

Xu Weidong, Gong Jin, Hong Wenming

(Architectural Design & Research Institute of Tongji University (Group) Co., Ltd., Shanghai 200092, China)

Abstract:The C-1 Pavilion in Urban Best Practice Area (UBPA) of Shanghai Expo adopted large cantilever and large span structures. According to the comparative analyses with the frame-steel reinforced concrete truss structure, the frame-shear wall-steel reinforced concrete truss structure system was verified to be reliable for the C-1 Pavilion. It is suitable to set shear walls at the appropriate part of the large cantilever, large-span structures, which could not only resist the horizontal forces in structures, but also adjust the elastic torsional displacement ratio and the deflection. By means of applying the FEA program SAP2000, the steel reinforced concrete truss had been designed and analyzed, therefore the problem of large cantilever and large  span structure was finally solved. Considering chords and shear walls suffered large amount of axial tension and the crack width could not meet the requirement of code, the prestressed reinforcement tendons were applied to the appropriate part of chords and shear walls. The design of truss components section and joint were finally provided for the reference of future similar projects.

Keywords:large cantilever; large span; shear wall; steel reinforced concrete truss; prestressed concrete chord; component section design; joint design

作者简介：徐伟栋，硕士，工程师，一级注册结构工程师,Email:witten_shu@163.com。

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