浦江體育中心張弦罩棚結構分析與設計
翁赟，闞建忠，趙國興，肖志斌
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（浙江大學建筑設計研究院， 杭州 310028）［摘要］介紹了浦江體育中心體育場預應力張弦罩棚（最大懸挑約30m）工程的基本概況、結構的平面布置、索桁架的結構形式以及整體經(jīng)濟性指標。對索桁架體系，分別進行了平面內的線性受力分析以及幾何非線性分析，總結了多種荷載工況下的索桁架受力特性。對線性與非線性分析結果進行比對，發(fā)現(xiàn)此類結構為半剛性結構，應當采用幾何非線性的分析方法。設計過程中確定了索桁架上下弦拉索初始張拉力的基本原則與技術要點；著重研究了支撐索桁架體系的外圍混凝土柱的受力特點。單獨推導了作為索桁架平面外支撐的環(huán)拱的等效軸壓剛度的計算公式，以及確定環(huán)拱截面的設計方法。［關鍵詞］鋼結構； 罩棚； 懸挑； 索； 預應力； 桁架中圖分類號：TU311.2文獻標識碼：A文章編號：1002-848X(2013)15-0058-05Analysis and design of cantilever string structure in canopy shell of Pujiang Sport CenterWeng 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作者簡介：翁赟，工學博士，工程師，Email：wengy@zuadr.com。參考文獻［1］CHEN W, LIU S. Design optimization and experimental study on beam string structures［J］. Journal of Constructional Steel Research, 2009, 65: 70-80.［2］CHEN W, LIU S. Studies on a large-span beam string pipeline crossing［J］. Journal of Structural Engineering, 2008, 134(10):1657-1667.［3］沈雁彬, 鄭君華, 羅堯治. 北京北站張弦桁架結構模型試驗研究［J］.建筑結構學報,2010,31(11):51-56.［4］杜文風, 高博清, 董石麟. 改進懸臂型張弦梁結構理論分析與試驗研究［J］. 建筑結構學報, 2010, 31(11):57-64.［5］DG/TJ 08-019—2005 建筑結構用索應用技術規(guī)程［S］. 上海：2005.［6］GB 50017—2003鋼結構設計規(guī)范［S］. 北京：中國計劃出版社，2003.
