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深圳大运中心体育场钢屋盖采用单层折面空间网格结构,悬挑跨度51.9m到68.4m,与混凝土看台完全脱开,依靠20个球铰支座,支承在标高6m的混凝土平台处,边界约束少、传力路径复杂、整体稳定问题突出。依据特征值屈曲分析确立了初始几何缺陷的不利分布,利用非线性有限元系统分析了结构整体稳定性能,并研究了关键部位、重要杆件对整体稳定性能的影响。分析结果表明:体育场钢结构属于缺陷不敏感结构;在最不利竖向与水平风荷载组合工况下,考虑几何非线性、材料非线性双重非线性效应,结构整体稳定系数接近3,结构具有较好的整体稳定性能,即使缺失关键部位和重要杆件,也不会发生连续倒塌,证实了该结构体系可行、安全可靠。
The steel roof of Shenzhen Grand Sports Center Stadium adopts a single-layer folded-face space grid structure with a cantilever span of 51.9m to 68.4m which is completely detached from the concrete grandstand and supported by 20 spherical hinge supports supported on a concrete platform with a height of 6m Less boundary constraints, complex force transmission paths and outstanding overall stability. Based on the eigenvalue buckling analysis, the unfavorable distribution of initial geometric defects was established. The overall stability of the structure was analyzed by using the nonlinear finite element method. The influence of the key parts and the important bars on the overall stability was also studied. The results show that the steel structure of the stadium belongs to the defect insensitive structure. Under the combination of the most unfavorable vertical and horizontal wind loads, considering the geometric nonlinearity and the material nonlinear dual nonlinear effect, the overall stability coefficient of the structure is close to 3, Good overall stability, even in the absence of key parts and important components, will not happen continuously collapse, confirmed that the structural system feasible and safe.