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(1 北京市建筑設計研究院 100045；2 五洲工程設計研究院 北京 100053)
［提要］ 全國農業(yè)展覽館新建中西廣場展廳平面為1505m×91m矩形，高度160m，主體為鋼筋混凝土框架，上部鋼屋蓋為77m跨張弦桁架結構。對屋蓋設計中的幾種可行結構方案進行了比較，對張弦桁架整體控制尺寸的確定進行了研究。介紹了屋蓋的結構平面布置，張弦桁架的受力分析及設計，撐桿上下端及支座等較為復雜的節(jié)點設計。索穿下弦桿及索端頭錨固處等受力較復雜的節(jié)點采用了鑄鋼節(jié)點，進行了兩類鑄鋼節(jié)點設計與受力分析。并對屋架的施工過程進行了簡要介紹。
［關鍵詞］ 全國農展館 展廳 張弦桁架 預張力 鑄鋼節(jié)點
Design and Analysis of Prestressed Truss String Roof Structure in the Exhibition Hall on Midwest Square for China International Agriculture Exhibition Center/Wei Dong1，Wang Zhigang1，Liu Jikang1，Ding Dayi2(1 Beijing Institute of Architectural Design & Research,Beijing 100045,China; 2 Wuzhou Engineering & Research Institute,Beijing 100053,China)
Abstract:The new Midwest Exhibition Hall for China International Agriculture Exhibition  Center is sized of 1505m×91m with 160m heigh.The main structure system is of reinforced concrete frame.The steel roof structure is 77mspan prestressed truss string structure(PTSS).The feasible roof structural styles are compared and how to choose the control sizes of PTSS are explained in detail.The roof structural layout,the design and calculation method of PTSS are introduced comprehensively.The detail of casting steel joint and slidinghinge connection are presented.The design and calculation of two types of casting steel connections are introduced in detail.And the steel roof construction process are mentioned compactly.
Keywords:prestressed truss string structure;prestress;casting steel connection