大型客滚船艏门支撑结构强度分析和优化设计

Strength Assessment and Optimization Design of Bow Door Support Structures for a Large Ro-Ro Passenger Ship

基于意大利船级社规范,对一大型客滚船的艏门船体支撑结构进行局部强度分析,基于该计算结果,分析艏部静水弯矩对局部强度的影响,对典型的圆弧过渡区域进行优化或补强,结果表明,冗余设计工况相比一般工况对结构强度起决定性影响;静水弯矩会降低局部结构应力,规范的强度校核相对保守;对圆弧过渡区域,板厚与圆弧半径与应力呈单调递减关系,且应力降低的速率随板厚、圆弧的增大不断降低,呈幂指数关系。

Based on the classification rules of RINA,the local strength of hull structure was assessed on the bow door,and the influence of bow still water bending moment upon the local strength was analyzed.The arc supported structures in the transition area of bow door were optimized or stiffened.The numerical results showed that the redundancy load condition has a decisive influence on the structural strength compared with the general loading conditions.The still water bending moment reduces the local structural stress,and the strength evaluation by rule is conservative relatively.For the arc transition regions,the stress decreases monotonically with the increase of the thickness of the plate and the radius of the arc,and the stress reduction rate decreases with the increase of these two parameters,with relationship of power function.