（1 同济大学建筑工程系，上海 200092； 2 同济大学建筑设计研究院，上海 200092；3 成都市基准方中建筑设计事务所，成都 610017）

［摘要］以上海世博会主题馆张弦桁架结构体系为背景，采用推广的“状态确定”的施工过程逆向分析方法对该屋盖结构进行施工过程分析，研究了施工张拉顺序、张拉分级对张拉过程中结构变形和构件内力的影响，追踪了结构几何力学体系成形过程，并对比分析了施工张拉的理论值和实测值。分析结果表明：对于该屋盖结构，单榀依次张拉张弦桁架的三级张拉方案能极好地控制结构在张拉过程中的最大位移响应和内力响应，为最优的施工张拉方案；结构施工模拟能较好地指导实际结构的施工张拉。

［关键词］张弦桁架；张拉顺序；张拉分级；施工过程； 逆向分析

Analysis on construction process of  truss string structure

Jiang Ziqin1, Ding Jiemin2, Hu Xiaojuan3

(1 Department of Building Engineering, Tongji University, Shanghai 200092, China;

2 The Architectural Design and Research Institute of Tongji University, Shanghai 200092, China;

3 Chengdu Jizhun Fangzhong Architectural Design Associates, Chengdu 610017, China)

Abstract:Based on the truss string structure of Theme Pavilion for Shanghai World Expo 2010, retrogressive analysis method was adopted to simulate the construction process of the structure. The influence of tension sequence and number of tension steps on the structural performance was analyzed, including internal force and deformation. Contrastive analysis between the numerical values and the theoretical analysis was also considered. The results show that the three-tension-step scheme which tensions the truss string structure step by step can minimize the structure response, including displacement and internal force, which is determined to be the optimal construction scheme of the structure. The construction process simulations of structure can greatly guide the tension of the structure.

Keywords:truss string structure; ten