摘要
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。
A type of structural system named as single-layer folded-plane latticed shell structure was adopted in the steel roof of main stadium of the Shenzhen Universiade Sports Center.The cantilevered span of the steel roof ranges between 51.9m and 68.4m.The steel roof was separated from the concrete grandstand completely and supported in a concrete platform by 20 ball joints.Characteristics of this structure were few border constraints,complicated load path and uncertainty of overall stability.The deformation shape due to initial geometric defect was found by characteristic buckling analysis.Then the overall stability was analyzed by nonlinear method.The influence of key positions and important bars to the overall stability was also studied.The results show that the steel roof is insensitive to initial geometric defect.The overall stability coefficient is close to 3,under the most unfavorable load combination of wind loads in both vertical and horizontal directions and considering both geometric nonlinearity and material nonlinearity.The structure has good overall stability.The progressive collapse will not occur even if the critical and important bars were lost.This structural system is feasible,safe and reliable.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2011年第5期56-62,共7页
Journal of Building Structures
关键词
单层折面空间网格结构
有限元分析
整体稳定
连续倒塌
single-layer folded-plane latticed shell structure
FEA
overall stability
progressive collapse
