船舶强度分析中的几个问题

New Technologies for Ship Structural Analysis

提出在分析现代船舶强度问题时值得重视的几个方面：①整船强度分析；②船体总体翘曲；③疲劳强度；④破舱后总纵强度．采用大连理工大学开发的通用程序ＪＩＦＥＸ９５对２７１６箱集装箱船进行了整船强度分析；作为算例，用薄壁梁有限元对一条３５７箱集装箱船进行了计算；在假定应力范围长期分布服从Ｗｅｉｂｕｌ分布时，形状参数可取为ξ＝１．２１５６－０．００１３３Ｌ．对如何计算热点应力也进行了讨论，并用影响数法计算了破舱后的最大静水弯矩和剪力，它是事半功倍的．推荐了破舱强度分析的准则．

The paper concentrates on four new technologies: (1) Global analysis of the whole structure. Finite element analyses of the global strength behavior of a 2 716 TEU container vessel is carried out by using general program JIFEX95 developed by Dalian University of Technoloty. (2) Torsional warping. By means of the thin walled beam theory in conjunction with the finite element method a 357TEU container vessel is calculated as a numerical example. (3) Fatigue strength. The shape parameter may be taken as ξ =1.215 6-0.001 33 L(L -ship length) when the long term distribution of stress ranges is supposed to follow the Weibull distribution. How to calculate the hot spot stresses is also discussed. And (4) Longitudinal strength of hull girder in flooded conditions. The maximum still water bending moment and shearing force in the flooded condition are evaluated with the aid of influence numbers, by which we can get twice the result with half the effort. A criterion to analyse the flooding collapse is recommended.