豪华邮轮极限强度计算的简化增量迭代方法

A simplified incremental iterative method for ultimate strength of luxury cruise ships

与一般的船体梁相比,豪华邮轮的上层建筑高而长,且在侧壁大面积开口,降低了剪切刚度,因此在研究豪华邮轮极限强度时不能忽略剪切变形的影响。基于整船的有限元分析,提出了一种适用于豪华邮轮极限强度计算的简化增量迭代方法,其核心是将主船体与上层建筑横截面作为两个平截面并绕着各自的中和轴弯曲,当上层建筑转换层的平均剪切位移达到其极限剪切位移时,转换层发生剪切破坏,整个船体梁将不能继续承受载荷。通过推导相关公式,编制一套完整的计算程序,进行对标计算,结果表明:相比于传统Smith法的计算结果,笔者所提方法精度明显提高。

Compared with general hull girders,the superstructure of a luxury cruise ship is tall and long.The side shell structure is discontinuous due to openings and the stiffness is lower.Therefore,the shear deformation effect cannot be ignored when the ultimate strength of a luxury cruise ship is studied.Based on the finite element analysis of the whole ship,a simplified incremental iterative method for the ultimate strength of luxury cruise ship is proposed.In this method,the cross section of the whole ship is taken as two plane cross-sections of the main hull and the superstructure and they bend around their respective neutral axis.When the average shear displacement of the conversion layer of the superstructure reaches the ultimate shear displacement,the conversion layer fails by shear and the entire hull girder cannot bear loads.The relevant formulas are deduced a calculation program is coded to calculate the benchmark.The results show that the accuracy of the proposed method is significantly improved compared with the traditional Smith method.