（浙江大学建筑设计研究院， 杭州 310028）

 

［摘要］介绍了浦江体育中心体育场预应力张弦罩棚（最大悬挑约30m）工程的基本概况、结构的平面布置、索桁架的结构形式以及整体经济性指标。对索桁架体系，分别进行了平面内的线性受力分析以及几何非线性分析，总结了多种荷载工况下的索桁架受力特性。对线性与非线性分析结果进行比对，发现此类结构为半刚性结构，应当采用几何非线性的分析方法。设计过程中确定了索桁架上下弦拉索初始张拉力的基本原则与技术要点；着重研究了支撑索桁架体系的外围混凝土柱的受力特点。单独推导了作为索桁架平面外支撑的环拱的等效轴压刚度的计算公式，以及确定环拱截面的设计方法。

［关键词］钢结构； 罩棚； 悬挑； 索； 预应力； 桁架

中图分类号：TU311.2文献标识码：A文章编号：1002-848X(2013)15-0058-05

 

Weng Yun, Kan Jianzhong, Zhao Guoxing, Xiao Zhibin

 (Architectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China)

 

Abstract: The pre-stress string structure is applied in the stadium’s canopy shell of Pujiang Sport Center. The maximum cantilever length is about 30m. The project overview, structural plane layout, structural form of string truss and economic indicators of the entire structure are introduced. The linear and nonlinear analyses for the string truss were conducted. The mechanical characteristics of string truss are concluded. According to the results, the string truss can be considered as semi-rigid structure, which should be analyzed by geometrically nonlinear method. The principles how to determine the pre-tension forces of strings are introduced. The RC columns which support the string truss are studied especially. Finally the equivalent formula for axial compression stiffness of circumferential arches as the out-plane supports to string trusses is derived, as well as the method to determine the cross section of arches is given.

Keywords: steel structure; canopy shell; cantilever; cable; pre-stress; truss

作者简介：翁赟，工学博士，工程师，Email：wengy@zuadr.com。

 

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