世博轴阳光谷钢结构稳定性分析  

Stability analysis of Sun Valley steel structure for the Expo Axis project

作　　者：赵阳[1] 田伟[1] 苏亮[1] 邢栋[1] 周运朱[1] 董石麟[1] 张伟育[2] 方卫[2] 张安安 

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058 [2]华东建筑设计研究院有限公司,上海200002 [3]上海世博土地控股有限公司,上海200125

出　　处：《建筑结构学报》2010年第5期27-33,共7页Journal of Building Structures

基　　金：国家科技支撑计划世博科技专项:世博轴及地下综合体关键技术研究(2009BAK43B06);上海市科学技术委员会科研计划项目世博科技专项:世博轴及地下综合体关键技术研究(08dz0580300);教育部新世纪优秀人才支持计划(NCET-07-0759)

摘　　要：世博轴阳光谷单层空间网格结构曲面形状复杂、几何尺度大、悬挑跨度大,其整体稳定性是结构分析与设计中的关键问题之一。分析以特征值屈曲模态作为初始几何缺陷分布形式的合理性,通过非线性有限元分析系统考察了阳光谷单层网格结构的整体稳定性能,并研究了单根杆件失稳对结构整体极限承载力的影响。分析结果表明:几何非线性以及几何、材料双重非线性临界屈曲承载力均满足相关规范要求,阳光谷钢结构具有良好的整体稳定性;阳光谷钢结构对几何初始缺陷不敏感,阳光谷上由索膜结构传来的索拉力可进一步降低其缺陷敏感性;局部杆件的失稳退出工作并不会导致结构整体承载力的突然丧失,整体结构具有良好的承载能力。The single-layer lattice structures of the Sun Valleys for Expo Axis project have complicated curved surface with huge dimensional size and large cantilever span,so overall stability is one of key problems in structural analysis and design.The rationality for introducing the eigenvalue buckling mode as the distribution pattern of initial geometric imperfection was discussed,and the overall stability behavior of the single-layer lattice structure was then investigated through nonlinear finite element analysis.The effect of single member buckling on structural ultimate load-bearing capacity was also examined.It is shown that,the critical buckling loads from both geometrically nonlinear analysis and geometrically and materially nonlinear analysis meet the requirement of relevant codes,so the San Valley steel structures have good overall stability bearing capacity.The Sun Valley steel structures are not sensitive to initial geometric imperfections in general,and the tensile forces from cable-membrane structure further reduce the imperfection sensitivity.Removal of local members due to buckling will not lead to a sudden loss of overall bearing capacity,indicating that the structure has a good load-bearing behavior.

关 键 词：单层空间网格结构 初始缺陷 非线性有限元分析 杆件失稳 整体稳定 

分 类 号：TU393.3[建筑科学—结构工程]