刚度对单层叉筒网壳结构的几何非线性稳定的影响

Geometrical nonlinear stability of single layer latticed intersected cylindrical shell affected by stiffness

本研究利用非线性有限元方法,对4点支承的单层柱面叉筒网壳进行几何非线性稳定全过程分析。通过配置不同截面杆件以改变结构的刚度,对比分析了结构刚度不同时的静力稳定临界荷载和失稳区域。分析得出结构的主肋刚度越大静力稳定性不一定越好,单层叉筒网壳结构的主肋杆件与其它杆件应合理匹配。

Based on nonlinear finite element theory, this paper analyzes the whole geometrical nonlinear stability of the single layer latticed intersected cylindrical shell structures. The stiffness of the structure is altered by different poles. By contrasting and analyzing critical loads and buckling area of the structure of different stiffness, the stability behavior of the shell is investigated, and some suggestions on their structural design on stiffness are presented. Results show that the stiffness of the main rib is greater but the stability behavior of the shell is not necessarily superior, so the poles of the main rib and others should be reasonably well matched.