Research On Finite Element Numerical Simulation Of Ship-bridge Pier Collision And Bridge Pier Anti-collision Equipment

With the rapid development of economy as well as science and technology,various large bridge going up like mushrooms,at the same time,along the way under ship s type and quantity more and more variety,which makes the contradiction between the bridge and ship increasingly highlight:the ship hit the bridge accidents occurred frequently.So, in order to reduce the accident,more and more people are devoted to the study of ship-bridge collision mechanism and pier anti-collision devices.Based on the serious situation of ship-bridge collision,contents of this paper is divided into two parts:(1)First, in order to learn more about the basic mechanisms of ship-bridge collision and all kinds of simplified formula and specifications aboat impact force,we refer to a large nunber of literatures.On this basis,the FEM software LS-DYNA will be used to ship hit the pier numerical simulation by finite element calculation of different working conditions,to determine the effect of different factors on the collision process.The main factors:the speed of the ship,pier type,impact location,tonnage,collision angle;the main calculation results:impact force,hit deep bow,pier displacement,stress collision of ships and piers and so on.Finally,the FEM calculation result of the impact force is used to compare with a variety of simplified formula and specifications,it is determined whether the FEM results.(2)Existing piers guards were reviewed,combined with the first part of this article related to the calculation results,this paper proposes two piers crash scenarios:"Fixed rubber fender piers anti-collision ";"FRP piers anti-collision pontoon".Respectively for the two programs finite element simulation,and determine the effect of different schemes crash,The main basis for judgment:the maximum impact force,the duration of the collision energy absorption,the collision stress,displacement of the pier.For the above two studies,the thesis is divided into five chapters:Chapters I and II introduces the boat-bridge Collision basic overview,basic calculation methods and theory,various simplified formula and specifications,finite element method,and the concrete constitutive model;Chapters III and IV are the core content of this article.the main content is to use the LS-DYNA to simulate;chapter V is a summary of the full text, and propose future research prospects.