(1 同济大学土木工程学院，上海200092； 2 华东电力设计院，上海200063)

［提要］国家大剧院钢网壳采用在施工阶段和使用阶段结构边界约束不同的设计方法，这种方法具有结构内力分布均匀合理且结构自重轻的优点。采用强迫位移法计算策略，对国家大剧院变边界约束钢网壳结构进行静力分析和非线性整体稳定性分析，为设计提供可靠的计算依据，并通过对传统常值约束边界和变约束边界结构的分析比较，说明变边界约束结构的特点，证明用于变边界约束结构分析的强迫位移法计算策略有效。

［关键词］钢网壳；变边界约束；强迫位移法；整体稳定性

Loading Behavior of National Grand Theatre Roof Structure-with Changed Boundaries/Luo Yongfeng¹, Yang Wei², Yu Rui¹(1 College of Civil Engineering, Tongji University, Shanghai 200092,China; 2 East China Electric Power Design Institute,  Shanghai 200063,China)

Abstract:A structure with different boundaries in construction stage and service stage is used in design of the roof structure of National Grand Theatre. The design method can improve the member force distribution in the structure and reduce the structure self weight. The compelling displacement computation technique is adopted for the static analysis and overall buckling analysis of the roof structure. The reliable numerical data are provided for the design. Compared with the traditional structures with constant boundary, the features of the structure with changed boundaries are presented.The efficiency and the accuracy of the compelling displacement computation technique are proved.

Keywords:roof reticulated shell; steel structure; changed boundary; compelling displacement  technique; overall stability