The ship ' s hull is a thin - walled box girder structure composed of stiffened panels . the overall failure of a ship hull girder is normally governed by buckling and plastic collapse of the deck , bottom , or sometimes the side shell stiffened panels . therefore , the analysis of buckling and ultimate strength of ship panels in deck , boltom , and side shells is very important and necessary for the safety assessment of ship structure . in stiffened panels , local buckling and collapse of plating between stiffeners is a basic failure mode , and thus it would also very important to evaluate the buckling and ultimate strength interaction of plate elements under combined loads 船体梁的总体失效通常取决于甲板、船底板,有时候是舷侧加筋板的屈曲和塑性破坏。因此,对于衡量船体结构的安全性而言,对甲板、底板、舷侧板进行屈曲和极限强度分析是十分重要且必须的。对于加筋板而言,加强筋间的板格之局部屈曲和失效是最基本的失效模式。