大型屋顶网壳结构稳定性分析及实时评估策略  

Stability of a large roof reticulated shell structure:analysis and real-time assessment

作　　者：李功标[1] 瞿伟廉[1] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,湖北武汉430070

出　　处：《武汉科技大学学报》2007年第4期416-419,共4页Journal of Wuhan University of Science and Technology

摘　　要：进行了大型屋顶网壳结构的非线性屈曲分析,提出了支撑钢牛腿失效后网壳结构稳定性的实时评估策略。在有限元分析中,对于结构中的主桁架梁采用梁单元,对其他构件采用空间杆单元来模拟,并采用柱面弧长法来跟踪结构的屈曲平衡路径。结构分析中仅考虑结构的自重和风荷载。计算风荷载时,结构上的风压力系数采用缩尺模型的风洞试验结果。非线性分析结果表明,该网壳结构具有较高的稳定性。The nonlinear buckling analysis of a large complex roof reticulated shell is made and a realtime assessment of structural stability is presented. A rigid-pin-joint model is used in which beam elements are used in the girder ribs and spatial bar elements are used in others. And a cylindrical arclength method is employed to trace the equilibrium path. For the roof structure, only wind loads and self-weight are considered. Wind pressure coefficients are obtained from a wind tunnel experiment of a reduced scale model. The results show that the shell is of excellent stability and the assessment strategy presented can be used in structural health monitoring.

关 键 词：网壳结构 稳定性评估 屈曲分析 柱面弧长法 

分 类 号：TU356[建筑科学—结构工程]