(1 混凝土及预应力混凝土结构教育部重点实验室, 南京 210096; 2 东南大学土木工程学院,南京 210096; 3 湖南省建筑设计院有限公司, 长沙 410012)

摘要: 张家界马戏城主馆屋盖是国内少见的带有大质量悬挂子结构的弦支穹顶屋盖,对其屋盖进行抗连续倒塌性能评估,先对结构进行了杆件敏感性分析,确定结构重要构件,然后采用替换路径法分别拆除弦支穹顶、子结构的重要构件,对屋盖结构进行了非线性动力分析. 结果表明:拉索及支座处径向桁架下弦杆是整个屋盖的重要构件;拆除外圈环索引起的结构整体响应最剧烈,拆除靠近支座径向桁架下弦杆会引起结构较明显的局部响应;子结构中,悬挂于径向桁架上弦的矩形格构柱沿柱截面失效,会使楼面梁局部变形过大,所有拆除工况均不会引起屋盖结构的倒塌;该带悬挂子结构的弦支穹顶钢屋盖冗余度高,具有较强的抗连续倒塌性能.

关键词: 张家界马戏城主馆; 悬挂子结构; 弦支穹顶; 敏感性分析; 抗连续倒塌

中图分类号:TU318 文献标志码:A 文章编号:1002⁃848X(2022)16⁃0037⁃08

DOI:10. 19701 / j. jzjg. 20200909

Analysis and assessment of progressive collapse resistance of a chord dome roof with suspendedsubstructure in the main hall of Zhangjiajie Circus City

SHU Ganping1,2, PAN Rui1,2, WANG Siqing3, CHEN Feng3

(1 The Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Nanjing 210096,China; 2 School of Civil Engineering, Southeast University, Nanjing 210096, China; 3 Hunan Provincial ArchitecturalDesign Institute Co. , Ltd. , Changsha 410012, China)

Abstract: The roof of the main hall of Zhangjiajie Circus City is a rare chord dome roof with a large⁃mass suspendedsubstructure in China. The progressive collapse resistance of the roof was evaluated. Firstly, the member sensitivityanalysis of the structure was carried out, and the important structural members were determined. Then, using thereplacement path method, the important components of the chord dome and substructure were removed respectively, and thenonlinear dynamic analysis of the roof structure was carried out. The results show that the cables and lower chords of radialtruss connected to the bearing are key components. The overall response of the structure caused by the removal of the outerring cable is the most severe, and the removal of the lower chord of the radial truss near the bearing will cause a relativelyobvious local response of the structure. In the substructure, the rectangular lattice column suspended on the upper chord ofthe radial truss fails along the column section, which will cause the local deformation of the floor beam to be too large, andall the demolition conditions will not cause the collapse of the roof structure. The chord dome roof with a suspendedsubstructure has high redundancy and strong resistance to continuous collapse.

Keywords: main hall of Zhangjiajie Circus City; suspended substructure; suspend⁃dome; sensitivity analysis;progressive collapse

第一作者:舒赣平,教授,博士生导师,从事钢结构的抗震性能、抗连续倒塌性能研究,Email:sgp0818@ vip. sina. com.

[引用本文] 舒赣平,潘睿,王四清,等. 张家界马戏城主馆带悬挂子结构的弦支穹顶屋盖抗连续倒塌分析与评估[J]. 建筑结构, 2022, 52 ( 16): 37⁃44. SHU Ganping, PAN Rui, WANG Siqing, et al. Analysis and assessment ofprogressive collapse resistance of a chord dome roof with suspended substructure in the main hall of Zhangjiajie Circus City[J]. Building Structure,2022,52(16):37⁃44.