单层网壳结构稳定性分析的改进随机缺陷法

Advanced stochastic imperfection method for stability analysis of single layer lattice domes

初始几何缺陷对网壳结构稳定性的影响是结构设计中的一个关键问题.对一致缺陷模态法和随机缺陷法的优缺点进行理论分析,提出了改进随机缺陷法,它弥补了随机缺陷法人工计算量大的缺点,也回答了设计临界荷载和一致缺陷模态法得到的临界荷载的可靠性问题.

The effect of initial geometrical imperfections on the stability of lattice shells is a key in structural design. A theoretical analysis on the advantages and disadvantages of consistent mode imperfection method and stochastic imperfection method is carried out. An advanced stochastic imperfections method is put forward, which does not require a large amount of manual computation and by which the reliability of design critical load and critical load obtained by the consistent mode imperfection method can be evaluated.