(北京市建筑设计研究院 100045)
【提要】 新中国国际展览中心主登录大厅屋盖结构方案采用了两撑杆张弦梁结构体系。介绍了屋盖的结构布置，对两撑杆张弦梁进行了稳定分析和整体计算分析，分析表明两撑杆张弦梁满足强度、刚度的要求。讨论了两撑杆张弦梁与普通张弦梁的差异、预拉力的确定、高跨比的影响和结构的抗风设计等问题。针对两撑杆张弦梁撑杆间距较远的特点，给出应用该类结构的一些建议。
【关键词】 撑杆 张弦梁结构 初始预拉力 高跨比 抗风设计
Structural Analysis of Two Braced Bars Beam String Structure Roof in Main Entry Hall of New China International Exhibition Center/Huang Guohui,Wang Zhigang(Beijing Institute of Architectural Design,Beijing 100045,China)
Abstract:Two braced bars beam string roof structure (BSS) is used in main entry hall of New China International Exhibition Center.The design of the roof is introduced.The stability analysis and integral calculation analysis are performed for the two braced bars BSS.The results show that the two braced bas BSS can meet the demand of strength and stiffness.Some problems such as difference between two braced bas BSS and general BSS,confirmation of pretensioning force,influence of heighttospan ratio and design of wind resistance are analyzed and discussed.Suggestions are given for the application of this structure according to larger space between two braced bars.
Keywords:braced bar;beam string structure;initial tensile force;heightspan ratio; wind resistance  design