（1 华南理工大学土木与交通学院， 广州 510640； 2 深圳华侨城房地产有限公司， 深圳 518053； 3 深圳千典建筑与工程设计有限公司， 深圳 518053；  4 信息产业电子第十一设计研究院科技工程股份有限公司， 成都 610021）

［摘要］某研究机构科研楼采用折板式网格与网架组合而成的空间结构，外形类似钻石体。该结构从中部开始往下内收，仅底部周边有柱脚支承，内部无支撑，约束较少，空间关系复杂，整体稳定性问题突出。利用ANSYS软件进行特征值屈曲分析，确定结构的初始几何缺陷分布，进而进行结构的非线性屈曲分析；研究了节点刚度、结构关键部位对整体稳定性能的影响；通过特征值屈曲分析反算了结构主要杆件的计算长度系数。分析结果表明：该钻石体折板式网格结构为对初始缺陷不敏感结构；在D+L工况下，考虑几何、材料双重非线性时，结构的临界荷载系数约为2-45，满足规程要求；节点的刚度对结构的稳定性影响较小；关键部位失效后，也不会发生结构的整体倒塌，证明了折板式网格是一种稳定性较好的空间结构形式。

［关键词］折板式网格结构； 整体稳定性； 双重非线性分析； 计算长度； 有限元分析

中图分类号：TU33+9文献标识码：A文章编号：1002-848X(2016)18-0087-06

Overall stability analysis of a diamond-shaped folded-plate latticed shell structure

Liu Hexing1， Liu Weiya2,3， Deng Yi3， Chen Feng4

(1 School of Civil and Transpotation Engineering，  South China University of Technology， Guangzhou 510640， China；2 Shenzhen OCT Properties Co.，  Ltd.，  Shenzhen 518053， China； 3 Shenzhen Qiandian Architectural & Engineering Designing Co.，  Ltd.，  Shenzhen 518053， China； 4 The Eleventh Design and Research Institute of Science and Technology Engineering Co., Ltd.，  Chengdu 610021， China)

Abstract:One research building of an institute is a diamond-shaped space structure composed of the folded-plate latticed shell structure and the grid structure. The structure trends slender from middle to bottom, only with pedestal bearings surrounding the bottom. There is no internal support and there are few constraints. The structure has complex spatial relationship and the overall stability issue is outstanding. ANSYS software was used to conduct eigenvalue buckling analysis to determine the distribution of initial geometric defects of the structure, and then non-linear buckling analysis was carried out. Influences of joint stiffness and key parts of the structure on overall stability performance were studied. The calculating length coefficient of main rod members of the structure was calculated through eigenvalue buckling analysis. The analysis results show that: the diamond-shaped folded-plate latticed shell structure is not sensitive to the initial geometric defects; under combined working conditions of D+L, critical load coefficient of the structure is about 2-45 when considering double nonlinear of geometry and material, which meets code requirements; impact of node rigidity on the stability of the structure is small; after the failure of key parts, there is no overall collapse, which proves that folded-plate latticed shell structure is a spatial structure with well stability.

Keywords:folded-plate latticed shell structure； overall stability； double nonlinear analysis； effective length； FEA

作者简介：刘和星，硕士，助理工程师，Email：mars920506@163.com。