（1 河北大学建筑工程学院， 保定 071002； 2 河北建设集团股份有限公司， 保定 071052；3太原理工大学土木工程学院， 太原 030024）

［摘要］以河北北方学院体育馆弦支穹顶屋盖为研究对象，考虑几何和材料非线性、活载布置方式及初始几何缺陷分布模式和大小等因素，对结构进行特征值屈曲和非线性屈曲的荷载-位移平衡路径全过程分析。研究表明：半跨活载布置对稳定承载力无不利影响，恒载及活载全跨布置、初始几何缺陷按第2阶屈曲模态分布时，结构稳定承载力最小。活载布置方式影响结构屈曲位移形态，活载全跨布置时局部凹陷区域为沿短轴跨度方向呈不对称形式分布，活载半跨布置时局部凹陷均位于活载最不利布置一侧呈带状分布。弦支穹顶结构对初始几何缺陷的变化比较敏感，结构由无缺陷到缺陷增加至跨度的1/100过程中，荷载-位移曲线平衡路径出现两种不同的模式。

［关键词］弦支穹顶结构； 特征值屈曲； 材料非线性； 初始几何缺陷

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2020)05-0082-06

Stability analysis on the suspend-dome structure roof of Hebei North University gymnasium

Liu Jing1, Zhao Ruoxu1, Chen Zongxue2, Li Haiwang3, Qie Luwen1

(1 College of Civil Engineering and Architecture, Hebei University, Baoding 071002, China;2 Hebei Construction Group Corporation Limited, Baoding 071052, China;3 College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract:The suspend-dome structure roof of Hebei North University gymnasium was taken as the research object, considering geometric and material nonlinearity, live load arrangement and initial geometric defect distribution mode and size, and the full process analysis was conducted on the load displacement equilibrium path for eigenvalue buckling and nonlinear buckling of the structure. The results show that the arrangement of half-span live load has no adverse effect on the   bearing capacity of stability. When the arrangement of dead load and full span live load and the initial geometric imperfection are distributed according to the second order buckling mode, the stability of bearing capacity of the structure is the smallest. The layout of live load affects the form of structural buckling displacement. When the whole span of live load is arranged, the local depressions are distributed asymmetrically along the direction of the short axis span. When the half-span of live load is arranged, the local depressions are all located on the side of the most unfavorable layout of live load and distributed in a strip. The suspend-dome structure is more sensitive to the change of the initial geometric defect. During the process of the structure changing from defect-free to defect increasing to 1/100 of the span, two different modes of the load-displacement curve equilibrium path appear.

Keywords:suspend-dome structure; eigenvalue buckling; material nonlinearity; initial geometric defect

*河北省自然科学基金（E2017201158），河北省高等学校科学技术研究项目（QN2016171），2016年“一省一校”专项经费，河北大学研究生创新资助项目(hbu2019ss017)。

作者简介：刘静，博士，讲师，Email:cimeng2005@163.com。