（同济大学建筑设计研究院（集团）有限公司， 上海 200092）

［摘要］长沙国际会展中心展厅钢屋盖呈反天际线的下凹形态，室内不设吊顶，屋盖钢结构力求简洁规则，以保证良好的室内观感。严格的观感要求和大跨度为屋盖结构的选型和设计带来挑战，经过多方案比选和优化，最终采用张弦梁结构。介绍了展厅屋盖结构体系选型、结构布置优化、构件形式优选及钢屋盖静动力特性、极限承载力，阐述了下凹形态张弦梁的侧向稳定性问题及解决方案，介绍了关键节点构造。分析结果表明，下凹形张弦梁结构有效满足建筑的美观需要和大跨度钢屋盖的受力需要，结构构件形式的优选和创新进一步突出建筑概念，实现结构构件建筑化。

［关键词］长沙国际会展中心； 张弦梁； 下凹形态； 钢结构； 屋盖选型； 建筑结构一体化

中图分类号：TU318， TU391.04文献标识码：A文章编号：1002-848X(2020)07-0067-07

Structural system selection and design for large-span concave steel roof of Changsha International Convention and Exhibition Center Hall

ZHANG Zheng, DING Jiemin, LI Lu

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

Abstract:The  roof of the exhibition hall of  Changsha International Convention and Exhibition Center hall is in a concave form of anti-skyline. There is no furred ceiling in the room. The steel structure of the roof aims to be simple and regular to ensure a good indoor appearance. Strict appearance requirements and large span brought challenges to the selection and design of roof structural system. After multiple schemes comparison and optimization, the beam string structure was finally adopted. The selection of roof structural system, the process of structural layout optimization, the optimization of component form, the analysis of static and dynamic characteristics and ultimate bearing capacity of steel roof were introduced, and the lateral stability problem and solutions of the concave form of the beam string were expounded, and the construction of key nodes was introduced. The analysis results show that the concave beam string structure can effectively meet the needs of the beauty of the building and the stress of the large-span steel roof. The optimization and innovation of the structural components further highlight the concept of the building and integrate the building concepts in the structural components.

Keywords:Changsha International Convention and Exhibition Center; beam string beam; concave form; steel structure; roof structural system selection; integration of architecture and structure

作者简介：张峥，博士，高级工程师，一级注册结构工程师，Email：72zz@tjad.cn