板片空间结构的改进一致缺陷模态法

目前工程上对结构进行缺陷稳定分析的主要方法是一致缺陷模态法。而利用该法对板片空间结构进行缺陷稳定分析得到的并不是结构的最小临界荷载。为此提出了改进的方法,即通过N-R法来引入结构的初始几何缺陷。为了检验改进方法的可行性,采用一个单层模型试验加以验证并且通过随机缺陷模态法得到了改进方法的可靠度。通过以上的检验,改进方法是可行的。这对板片空间结构的设计和研究有着重要的意义。

IMPROVED CONSISTENT IMPERFECT BUCKLING ANALYSIS METHOD FOR STABILITY ANALYSIS OF SHEET SPACE STRUCTURE

The consistent imperfect buckling analyses method(CIBAM) is the main approach of analyzing the stability of the structure with the geometrical imperfection in the civil engineering field.There was limitation that the obtained minimum stability bearing capacity by CIBAM was not the real smallest one for the sheet space structure system.To enable the method to fit the sheet space structures,simulating the initial geometrical imperfections with the N-R method,an improved consistent imperfect buckling analysis method(ICIBAM) was proposed in this paper.The ICIBAM was approved correct by model experiment and its dependability got by the stochastic imperfection method.So the ICIBAM is important to design and application of the sheet space structure system.