船体大破口损伤下总纵极限剩余承载能力计算

Calculation of longitudinal residual capacity of ship with large crevasse

[目的]在大破口损伤下计算船体总纵极限剩余承载能力时,是否计及船舶的浮态变化以及破口位置和大小等非线性耦合因素的影响,是合理评估船舶破损后的总纵极限剩余承载能力时值得深入研究的问题。[方法]以某船船体舯剖面大破口损伤为研究对象,采用Smith方法对船体总纵极限剩余承载能力进行计算分析,重点计算船舶因破损可能导致的不同倾斜角和连续浮态变化的总纵极限剩余承载能力。[结果]结果表明,不考虑船舶浮态变化,仅在船舶正浮状态下扣除大破口结构的计算结果,将会过高估计船舶破损后的总纵极限剩余承载能力。[结论]所用方法较为简便、快捷,可为船舶结构设计以及船舶损伤后的快速决策提供参考。

[Objectives]The calculation of the ultimate residual capacity of a ship with a large crevasse is influenced by such factors as the location and size of the crevasse,floating state of the ship and nonlinear coupling.[Methods]A ship hull with a large crevasse is chosen as the research objective,and the Smith method is used to calculate and analyze the longitudinal residual bearing capacity.Emphasis is placed on calculating the changes in the ship's inclined angle and floating state caused by damage to its longitudinal residual bearing capacity.[Results]The results show that without considering the changes in the ship's floating state,calculation results which deduct the area of the crevasse only in the positive floating state of the ship will overestimate the longitudinal limit residual load capacity of a damaged ship.[Conclusions]Using this research method,we can reasonably and simply evaluate the longitudinal residual load capacity of a hull under large breach damage,which can provide technical support for ship design and rapid decision-making after a ship sustains damage.