船舶与海洋平台碰撞的动力响应分析

建立了船舶与海洋平台碰撞的弹塑性动力分析方法．首先研究了平台圆管构件的局部凹陷特性，推导了一个带凹陷损伤的圆管截面的屈服条件，以考虑局部凹陷损伤造成的构件承载能力的减弱．采用塑性节点法结合大位移分析理论，综合考虑构件的局部凹陷变形、构件整体变形以及平台结构的总体变形，对船与平台组成的碰撞系统的非线性动力响应作了详细的数值模拟，得到了碰撞过程中平台结构变形、损伤和碰撞力等响应信息．最后，给出了一个典型的供应船与导管架平台碰撞的计算例子．

Dynamic Analysis of Ship/Platform Collision

This paper presents an accurate and efficient method for the dynamic analysis of ship/platform collision. A nonlinear force-displacement relationship is derived for the simulation of the local indentation in a hit tubular member and the yield surface for a dented tubular section is used to account for the reduction of load carrying capacity of the hit member. Large deformation and plasticity are considered by combining an elastic large displacement analysis theory with plastic node method. The dynamic elastic-plastic response of off shore platforms in typical ship collision situation is investigated. One example of a jacket platform struck by a supply ship is demonstrated finally. The presented procedure has the advantage of simplicity and efficiency because of the successful application of plastic node method.