基于弯扭耦合的破损船剩余强度评估方法研究

Residual strength assessment method of damaged ships based on bending-twist coupling effect

破损舰船的剩余承载能力是检验结构设计合理性的一个重要指标。现有的破损舰船剩余承载能力评估主要考察垂向弯矩,缺乏考虑船体在斜浪状态下结构组合变形的综合影响。文章对破损舰船剩余承载能力评估方法进行了研究。在考虑船体组合变形的影响下,建立了弯扭耦合方程。通过非线性有限元计算,确定结构耦合系数,并在此基础上提出了破损舰船的剩余承载能力的可靠性评估方法。

The residual strength of damaged ship structure is an important indicator of structural design. The method on the residual strength mainly considers the vertical bending moment and ignores the influ-ence of the combined deformation in oblique waves. In this paper, the method on the residual strength of the damaged ship is studied. The interaction equation on bending-twist coupling effect for damaged ship under the combined deformation is derived. The structural coupling coefficients are determined by NFEM method. The reliability assessment methods of damaged ship on residual strength are established with considering the bending-twist coupling effect.