（北京市建筑设计研究院有限公司， 北京 100045）

［摘要］北京城市副中心绿心剧院项目由歌剧院、戏剧院及音乐厅三个单体建筑组成。空间钢结构屋盖竖向构件通过外围设置柱距为16.8 m的钢柱，内部利用主体墙体设置V形撑支撑屋盖； 水平构件采用斜交单层网壳以适应曲面建筑造型。通过对屋面精确找形获取正确结构分析模型，以及对杆件放样采取适当措施，以保证施工顺利进行并且达到建筑预期效果。基于钢结构屋盖特殊曲面形态并考虑基本计算假定，结合风洞试验进行可靠性校核，对各弹性工况下斜交单层网壳进行承载力以及变形分析。在弹性设计的基础上，进一步采用Riks弧长法并考虑几何和材料非线性以及初始几何缺陷分布模态对斜交单层网壳稳定性的影响。计算结果表明：斜交单层网壳在各弹性工况下承载力、变形的验算结果均满足规范要求。基于Riks弧长法考虑材料和几何非线性的弹塑性极限承载力较高、结构整体稳定性较好。

［关键词］北京城市副中心； 绿心剧院； 空间网格；  钢屋盖；  斜交单层网壳；  屈曲分析；  初始几何缺陷；  材料非线性； 几何非线性

中图分类号：TU391文献标识码：A文章编号：1002-848X(2020)20-0008-08

Design of steel structure roof of Green Heart Theatre in Beijing Municipal Administrative Center WU Hao, JANG Yang, GENG Haixia, YANG Yong, 

SUN Ke, YUAN Guomiao, ZHOU Wenjing,  HE Yang

(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract: Green Heart Theatre project of Beijing Municipal Administrative Center is composed of three single buildings: an opera house, a drama theatre and a concert hall. The steel structure roof were set up with 16.8 m steel columns on the periphery, and the main wall used V-shaped braces on the inside to support the roof. The horizontal members use diagonally intersecting  oblique single-layer latticed shell to accommodate curved building shapes. Through the accurate form finding of the roof, the correct structural analysis model was obtained, and appropriate measures were taken for the lofting principle of members, so as to ensure the smooth construction and achieve the expected effect of the building. Based on the special curved surface shape of steel structure roof and considering the basic calculation assumption, the reliability check was carried out combined with wind tunnel test, the bearing capacity and deformation of oblique single-layer lattied shell under each elastic condition were analyzed. On the basis of elastic design, the Riks arc length method was further used to consider the effects of geometric and material nonlinearity and initial geometric imperfection distribution modes on the stability of  oblique single-layer latticed shell. The calculation results show that the checking results of bearing capacity and deformation of  oblique single-layer  latticed shell under various elastic conditions meet the requirements of the code. Based on the Riks arc length method, considering the material and geometric nonlinearity, the elastoplastic  ultimate bearing capacity is higher and the overall stability of the structure is better.

Keywords:Beijing Municipal Administrative Center; Green Heart Theatre; spatial grid; steel roof;  oblique single-layer  latticed shell; buckling analysis; initial geometric defect; material nonlinearity； geometric nonlinearity

作者简介：吴昊，硕士，工程师，Email: 373384869@qq.com。