散货船碰撞损伤后的剪切极限强度

船体梁受到碰撞损伤后,必须有足够的剩余强度用以抵抗最大外弯矩,同时还需能够承受最大剪力.在众多类型的船舶中,散货船是一种抗剪能力较差的船型.对于其碰撞损伤后纵向剩余极限弯矩的研究已有较多的文献[2-7],而对于碰撞损伤后的剪切极限强度的研究目前还比较少.针对这一现状,本文的主要目的在于分析讨论散货船受到碰撞损伤后的极限承剪能力;分析结构几何尺寸,碰撞损伤形状以及边界条件等各种因素对碰撞破损船体抗剪能力的影响.为了方便起见,文中也给出了相应的回归经验公式.本文同时还推导了一个船体梁碰撞损伤后的初始屈服剪力计算公式.最后,本文以一艘散货船为例,计算分析其碰撞损伤后的抗剪能力,从中得出一些有益的结论.

Ultimate shear strength of bulk carrier with collision damage

When collision occurs,the ship hull girder must have enough strength to sustain ultimate external bending moment and shear force.Bulk carrier is very weak to sustain shear force due to its single side shell.Most documents focus on its residual ultimate bending moment after collision instead of its residual ultimate shear strength.The aim of this paper is to investigate the residual ultimate shear strength of bulk carrier after collision.The collision place is assumed to be occurred in side shell or topside tank excluding bottom.The influences of various factors affecting the ultimate shear strength of ship hull girder,such as collision damage shapes, dimensions of side shell, boundary conditions, have also been studied using the elastic-plastic FE method.A simple analysis method is developed to calculate the initial yield shear force with long longitudinal cut collision.Based on the calculation results of a bulk carrier,some useful conclusions are drawn.