周边双层中间单层球面网壳稳定性分析

STABILITY ANALYSIS OF PERIPHERAL DOUBLE AND INTERMEDIATE SINGLE RETICULATED SHELLS

目前,对局部双层球面网壳稳定性相关的研究工作不是很多,对于不同形式的Kiewitt(凯威特)型局部球面网壳的稳定性已经有一定研究,但缺乏对Kiewitt型与Schwedler(联方型)型这两种最常用的结构形式的局部双层网壳进行结构非线性稳定性屈曲分析的比较。基于离散化假定几何非线性的有限元理论,通过对Kiewitt型与Schwedler型两种不同结构形式的局部双层球面网壳进行屈曲荷载分析,对局部双层球面网壳的静力稳定性有了进一步了解。利用有限元分析软件ANSYS,将弧长法与Newton-Raphson方法结合,对结构进行了非线性屈曲稳定性的全过程分析,并在这个过程中考虑了初始缺陷对结构稳定性的影响。最后对这两种常用结构形式的网壳进行对比分析,提出它们的受力特点,并给出合理的构造建议。

A geometrical nonlinear research on partial double reticulated shell is done by disperse supposition of finite element theory. Through analyzing and comparing the flections load on partial double reticulated shell of two different kinds of structural models：Kiewitt and Schwedler, the influencing factors of static ability of the shell are studied. Using finite element software ANSYS to carry out the structure nonlinear stability whole process analysis by adopting arc-length method and Newton-Raphson method. Finally a contrast analysis is done for these two common shells, and reasonable suggestions on these structures are given.