上海佘山森林剧场网壳结构稳定性研究与分析

Stability Analysis of Net Shell Structure for Shanghai Sheshan Forest Theater

上海佘山森林剧场网壳是跨度为92m、高27.8m的双层椭球体网壳。基于有限元ANSYS结构分析程序,建立了网壳结构的空间有限元模型,计算了网壳的静力性能。系统分析了不对称分布荷载作用下,网壳的特征值屈曲荷载和考虑初始缺陷、几何非线性、几何材料双重非线性时网壳结构的极限荷载。结果表明,几何、材料双重非线性、荷载的不对称分布对该网壳结构的极限承载力影响很大。为类似结构的工程设计、计算提供参考。

Net Shell of Shanghai Sheshan Forest theater is a doublelayer spheroidal steel tube structure with a span of 92 m, height 27.8m.The net shell' s 3D finite element model was created by structrual analysis program ANSYS,and it' s static performance was calculated.The ultimate load and eigenvalue buckle load for the net shell were systematically analysed under unsymmetrical loading.The nonlinear stability calculation of the shell was performed based on considering its initial geometrical imperfection,geometric nonlinearity,double nonlinearity of geometric and material.The results show that the ultimate bearing capacity of the shell is determinated by unsymmetrical loading and the double nonlinearity of geometric and material.It has provided a reference for the design and calculation of similar engineerings.