船舶与海洋平台碰撞的动塑性分析

Dynamic Plastic Analysis of Ship Platform Collision

建立了船舶与海洋平台碰撞系统的运动方程式，利用塑性节点法结合大位移理论处理碰撞过程中结构的大变形、塑性以及应变硬化等问题，并考虑了圆管局部凹陷特性、橡胶护舷、水动力、构件屈曲等因素对碰撞过程的影响．文中采用Ｗｉｌｓｏｎθ法结合修正的牛顿－拉夫逊迭代对碰撞结构系统的非线性动力响应进行了数值模拟，并给出了一个典型的供应船与平台碰撞的动塑性分析算例．

This paper studied intensively the problems of the collision and damage of offshore platform. A nonlinear force displacement relationship is derived for the simulation of local dent in a hit tubular member and the yield surface for a dented tubular section is developed to consider the reduction of load carrying capacity of the hit member. Large deformations, plasticity and strain hardening of the beam column element are taken into account by combining an elastic large displacement analysis theory with the plastic node method. The effect of hydrodynamic forces acting on the platform, the rubber fender and the buckling behavior of beam column on the collision are also analyzed.