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采用随机缺陷模态法对凯威特–联方型单层网壳进行非线性稳定分析,研究了随机缺陷空间样本数量、矢跨比等因素对网壳结构稳定极限荷载的影响,并将随机缺陷模态法计算结果与一致缺陷模态法计算结果进行了对比.结果表明:采用概率统计方法对该网壳进行稳定分析时,随机缺陷样本数量应不小于90;对于矢跨比较大的单层网壳结构,采用一致缺陷模态法计算稳定临界荷载的概率可靠度较低,需要采用随机缺陷模态法加以验证;当网壳结构的矢跨比小于1/6时,两种初始缺陷分布方法计算出的稳定承载力较为接近.
The stochastic defect modal method is used to analyze the nonlinear stability of the Kaweite-Sikang single-layer reticulated shell. The effects of the number of random defects, the ratio of sag to span and other factors on the stability ultimate load of reticulated shell are investigated. The results of defect modal method and the consistent defect modal method are compared.The results show that the probability of statistical method for the stability analysis of the reticulated shell, the number of random defects samples should be not less than 90; For the reticulated shell structure, the probability of stable critical load calculated by the consistent defect modal method is low, so it needs to be verified by stochastic defect mode method. When the ratio of cross-span of the reticulated shell structure is less than 1/6, two kinds of initial defects The stable bearing capacity calculated by distribution method is relatively close.