The thesis considers 3 kinds of imperfection forms: the welded-joint imperfection, the consistent mode imperfection and the random imperfection.
全文对筒仓引入了3种缺陷，即周圈焊缝凹陷缺陷、一致模态缺陷和随机缺陷。
The initial imperfection and the strength parameters are considered as random variables. Ply-level failure probability is evaluated by the first order reliability method.
初始缺陷和强度参数为设计变量，采用一阶矩法计算单元层的失效概率。
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