The Numerical Simulation For The Collision Between Ship And Bridge Pier Anti-collision Equipment

Ship-bridge collisions often take place everywhere in the world. The frequency of accidents is so high. The loss of lives and property and destroy to environment are striking. Recently, in order to reduce the loss of accidents, many experts bend themselves to the study of the mechanism in ship-bridge collision and the effective equipment for anti-collision.Either the collision between ship and bridge or ship and anti-collision equipment is a complicated non-linear dynamic response process under extreme large load in a very short time. Because of the complicacy and the uncertain factors in collision process, it is nearly impossible to make theoretic analysis by building up an accurate mathematic model. Therefore, numerical simulation by finite element analyses will become a more and more effective means in the analysis of collision problems between ship and bridge or equipment for anti-collision nowadays.Based on the urgent need that pier protective device primarily designed needed to be tested its crashworthiness by the impact of ship in multi-situation, etc in multi-angle and multi-water, the writer analyzed the critical elements that affect the simulation of the collision between ship and pier protective device, and found the feasible way to deal with the conflict between calculation efficiency and precision. Using this method and employing ANSYS/LS-DYNA program, which is the universal nonlinear dynamic analysis software, a head-on collision between ship and pier protective device designed for Guanzhou River Bridge is simulated and presented, the simulation of time history course of full-scale mini-collision between ship and pier protective device was taken into reality with a spot of elements (less than 21000) and scanty time (9 hours on P4 PC). In the end, the damage process and energy absorbing are obtained, which are of great value for this kind of pier protective devices design.The thesis has six chapters: in chapter one, the author introduces the background and significance of the study. Chapter two is introduction about the analytical method for solving approaches of external dynamics of ship collision.In chapter three, the fundamental theory for numerical simulation of collision is studied. In chapter four, the writer studied and discussed the critical elements that affect the simulation of the collision between ship and pier protective device, and found the feasible way to deal with the conflict between calculation efficiency and precision. Chapter five and six, a head-on collision between ship and pier protective device designed for Guanzhou River Bridge is simulated and presented.