Research On Design And Performance Of Anti-ship Collision Structure Under Ship Impact Scene

China's land and sea transportation system is in a period of rapid development,accompanied by the construction of more and more cross-river bridges.While improving the transportation,these bridges have become an obstacle to the navigation of ships.In recent years,vicious accidents caused by ships hitting bridges have occurred all over the world.Such accidents often lead to huge economic losses,casualties and serious social consequences.Therefore,the research on the collision of ships and bridges has received widespread attention and discussion from experts and scholars all over the world.Bridge anti-collision facilities have emerged in this context.Firstly,according to the basic situation of the bridge area,this paper analyzes the risk of bridge ship collision and possible dangerous situations,calculates the collision resistance of the pier itself,and uses the empirical formula and numerical method to calculate the ship impact force,designed according to the anti-collision requirements.A fixed anti-collision structure.On this basis,different impact scenarios are considered.The nonlinear finite element method is used to calculate the collision process of the ship against the collision fender.The failure mechanism and energy absorption effect of the collision avoidance structure are analyzed,and the process of the bridge collision is carried out.Simulation analysis provides a useful reference for the design of bridge anti-collision structure.The work carried out in this paper is mainly as follows:(1)According to the basic data of bridges,hydrology and navigable ships,the representative ship type and ship impact speed are determined;the accessibility of bridge ship collision is analyzed,and possible collision scenarios are determined.(2)On this basis,the finite element model of the bridge and the representative ship type is established,and the numerical method is used to simulate the dynamic process of the ship striking the bridge to obtain the ship impact force.The ship impact force was calculated by different experience and norm formula,and compared with numerical analysis.The applicable scope of the empirical formula was discussed and the ship collision force standard was determined.(3)The finite element method is used to analyze the bridge crashworthiness.According to the bridge itself and the ship collision scene,as well as the different energy absorption and protection requirements of the pier and the cap,a fixed anti-collision structure was designed.The numerical simulation method is used to simulate the dynamic process of impact protection structures of different ship types.The crashworthiness of the structure is analyzed,and the effectiveness of the anti-collision structure design is determined to ensure the safety of the bridge.This paper is divided into four chapters.The first chapter introduces the research on the collision of bridges and the research background and significance of bridge anti-collision facilities.It lists the vicious accidents of bridge collisions at home and abroad,and introduces experts and scholars at home and abroad.The research overview of collision and collision avoidance facilities.The second chapter analyzes the impact angle,impact speed and impact position of the ship based on the hydrology and navigation channels of the Jinma Bridge,and determines the representative ship type and collision conditions.The finite element model of the ship bridge is established in ANSYS/LS-DYNA,the ship impact force is calculated,and the results of each empirical formula are compared and analyzed,and the collision force of the bridge is calculated by the finite element method.The third chapter is based on the ship collision force and The anti-collision performance of the bridge was designed as a fixed fender type anti-collision facility for the bridge.The material and thickness of the anti-collision fender structure were analyzed by the results of ANSYS/LS-DYNA finite element simulation calculation of the ship collision avoidance device.The impact of different impact positions,impact speeds and ship types on the anti-collision performance of collision avoidance facilities;Chapter 4 summarizes the full text and looks forward to the future research work.