(同济大学建筑工程系，上海 200092)
［摘要］对大跨度预应力张弦梁常见的施工方法及其特点进行了总结与分析。以上海源深体育馆预应力张弦梁为背景，通过基于ANSYS的优化分析、非线性全过程分析以及屈曲分析，重点研究了预应力张弦梁下弦钢索张拉力的优化、关键施工状态下结构的受力性能分析与稳定性分析等施工控制中的关键技术问题。在此基础上，进行了两榀预应力张弦梁1:9缩尺模型的施工模拟试验，研究了张弦梁施工全过程的受力性能。有限元分析与试验结果表明：对下弦钢索的张拉力进行优化可以有效地改善结构在设计状态下的受力性能；合理的结构设计可以保证张弦梁在施工过程中的强度与稳定性；预应力的张拉宜以跨中反拱作为控制指标；有限元计算值与试验结果吻合良好。
［关键词］预应力张弦梁；施工控制；模型试验；优化分析；非线性有限元分析；结构稳定
Study on construction control technologies for long-span prestressed beam string structure
Liu Sheng, Xue Weichen (Building Engineering Department, Tongji University, Shanghai 200092, China)
Abstract:Ordinary construction methods for long-span prestressed beam string structures and their characteristics are summarized and analyzed. Based on the beam string structure of Shanghai Yuanshen Arena, this paper focuses on some key technological problems, such as the optimization for the cable stretching forces, the analysis of load capacity and stability under important construction states. Two 1∶9 scaled model tests are conducted to simulate the full-range construction progress for the beam string structure. Studies show that the optimization for stretching forces of the cables may efficiently improve the load capacity during the serviceability phase. The strength and stability of this structure is reliable through reasonable design. The mid-span camber should be taken as the control index during cable stretching. The analytical results calculated by the nonlinear FEM are in good agreement with the test results.
Keywords:prestressed beam string structure; construction control; model test; optimization; nonlinear FEM analysis; stability
通讯作者：薛伟辰，博士，教授，Email:xuewc@tongji.edu.cn
参考文献
［1］MASAO SAITOH. Study on mechanical characteristics complex structure composed of a membrane and a beam of a lightweight string structure［C］//IASS Symposium on Spatial, Lattice, Tension Structures, 1994: 633-641.
［2］陈德伟，郑信光，项海帆.混凝土斜拉桥的施工控制［J］.土木工程学报，1993，26(1)：1-11.
［3］KATO S, NAKAZAWA S, MATSUE Y, et al. Active control of axial forces in beam string space frames［C］//IASS Symposium on Spatial, Lattice, Tension Structures, 1994: 664-673.
［4］陈以一，汪大绥.上海浦东国际机场候机楼R2钢屋架足尺试验研究［J］.建筑结构学报,1999，20(2)：9-17.
［5］陈荣毅，董石麟，吴欣之.大跨度预应力张弦桁架的滑移施工［J］.空间结构,2004，10(2)：40-42.
［6］刘凯，高维成，刘宗仁.大跨张弦桁架新型施工工艺的理论与现场实测的研究［J］.建筑结构学报，2004，25(5)：61-65.
［7］黄明鑫.大型张弦梁结构的设计与施工［M］.济南：山东科学技术出版社，2005.
［8］郭海山，郭剑云，李盛举.全国农展馆新馆77m跨张弦桁架钢结构技术［J］.建设科技，2005，(16)，44-45.
［9］薛伟辰.现代预应力结构设计［M］.北京：中国建筑工业出版社，2003.
［10］SAITOH M, OKASA A. The role of string in hybrid string structure［J］. Engineering Structures, 1999, 21(8): 756-769.
［11］刘晟，苏旭霖，陆平，等.上海源深体育馆预应力张弦梁设计计算［C］//首届全国建筑结构技术交流会专辑，建筑结构，2006，36(S1).