132m跨双层圆柱面网壳的非线性稳定分析

以132 m跨国内最大的干煤棚双层三心圆柱面网壳为研究对象,采用ANSYS有限元分析程序研究其稳定性。在计算中,考虑了载荷作用方式及结构的几何缺陷等因素对网壳稳定性的影响。研究表明:竖向载荷的分布方式对网壳的屈曲载荷影响不大,但对屈曲模态影响较大;满跨水平载荷的屈曲载荷仅为满跨竖向的56%;网壳的屈曲载荷均随结构几何缺陷的增加而减小,且几何缺陷对水平载荷作用下屈曲载荷的影响大于对竖向载荷作用下的影响。

Buckling Analysis of 132 meter Span Double-Layer Reticulated Cylinder Shell

This paper presents a calculation investigation on the buckling of a 132 meter span reticulated cylinder shell built in Jincheng City under the loads of different directions and applied areas with ANSYS.The influence of the different geometrical imperfections on the buckling behavior of the shell has been analyzed by detailed numerical analyses.The critical loads and the buckling modes of the shell with different geometrical imperfections under the different loadings have been achieved.The results show that its critical load under the fully-spanned horizontal loading is only 56 percent of that under the fully-spanned vertical loading,that the geometrical imperfections decrease the critical loads and change the buckling modes greatly,and much more under the fully-spanned horizontal loading than under the fully-spanned vertical loading.