板片空间结构的缺陷稳定分析

目前工程中主要采用的一致缺陷模态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。提出了改进的方法,即采用弹性完善空间结构的临界位移作为结构最不利的初始几何缺陷,然后采用New-Raphson法求得结构的临界荷载。根据对随机缺陷模态法得到的改进方法的概率可靠度以及对具体的模型试验的分析,可以认为改进方法所得到的临界荷载是结构的最小临界荷载。

Stability analysis of imperfect sheet space structure

The smallest stability bearing capacity of space structure is the main purpose of the stability analysis of the space structure with the geometrical imperfection,and the consistent imperfect buckling analysis method(CIBAM) is the main approach.There is limitation that the obtained minimum stability bearing capacity by CIBAM is not the real smallest one for the sheet space structure.An improved consistent imperfect buckling analysis method(ICIBAM)which regards critical displacement of the elastic perfect space structure as the worst initial geometrical imperfection is advanced.The stability capacity is the smallest one in terms of experiments and the dependability got by the stochastic imperfection method.