水下爆炸作用下舰船的剩余强度及可靠性评估

Reliability and Residual Strength Study of Ship Subjected to Underwater Explosions

针对水下爆炸作用下的破损舰船结构,提出了一个基于船体剩余强度的可靠性分析模型。应用逐步崩溃原理,对船体的剩余强度进行研究。基于船体结构剩余强度的失效模式,建立爆炸作用下船体结构的可靠性分析模型,并采用重要抽样法对其进行计算。运用Fortran语言编制了基于剩余强度的破损船体结构可靠性的完整分析程序,通过算例对不同破口位置和横倾角的剩余强度及可靠性进行计算。结果表明舰船中垂时的失效概率比中拱时大;舰船底部破损是最危险的,此时可靠性较低;且横倾角对破损舰船的剩余强度影响较大。

A reliability analysis model of the damaged ship subjected to explosions is introduced. The residual ultimate strength of ship is studied with progressive destroy theory. The reliability analysis model is set up based on the strength failure mode, and it is calculated with the importance sampling method. The complete procedure has been coded into a Fortran program. The residual strength and reliability of a ship damaged in various location with various rolling angles analyzed. It is found that the ship damaged in bottom is in the serious status, and the rolling angle has important influence on the damaged ship residual strength. The results also indicate that the fail probability of ship in sagging is larger than in hogging, and the reliability of the ship damaged in bottom is markedly low.