桥墩防船撞消能器动力性能的数值仿真分析

利用显式瞬态非线性有限元分析技术,探索了船舶撞击桥墩防撞设施的数值仿真分析方法,分析中充分考虑了碰撞中出现的材料非线性、几何非线性、接触非线性、运动非线性以及它们之间相互耦合的特性。并借助于ANSYS/LS DYNA非线性有限元程序,仿真分析了洞头跨海大桥主桥桥墩的防撞消能器在各种船舶撞击下的动力性能,得到了不同的撞击角度、不同的初始动能下船舶的动能损失、撞击力时间历程及防撞消能器的能量吸收和变形的时间历程,并得到了它们之间的相互关系,为桥墩防撞消能器的优化设计提供了一些理论根据。

Numerical simulation analysis of dynamical performance of equipment protecting from ship-bridge collision

Nonlinear FEM with momentary display function is applied to simulating the collision process of ship-collision protection of bridge. Many characters are taken into account, such as material nonlinearity, geometric nonlinearity, contact nonlinearity, movement nonlinearity and coupling characters among them etc. Based on the ANSYS/LS-DYNA nonlinear FEM program, the dynamical performances of collision protection of the Dong-tou Bridge over sea are simulated at all kinds of collision. The history of losing kinetic energy and collision force of ship are obtained; at the same time,the course of absorbing energy and deformation of collision protection are acquired at different collision angle and at different collision velocity. The results of the collision simulation can help the engineers to obtain an optimal design of the collision protection equipment.