| The possibility of ships hitting bridges and the severity of accidents are increasing along with the increase in the number and tonnage of ships.The research and development of bridge collision avoidance facilities has attracted increasing attention.In view of the current situation that there is no design standard for bridge anti-collision facilities,this paper analyzes the impact performance of corrugated sandwich bridge anti-collision fenders,and proposes a design method based on ship collision energy,which has reference significance for standardized design.First,the numerical method is used to analyze the impact factors of the impact resistance of the corrugated sandwich anti-collision fender,determine the main influencing parameters,and optimize the anti-collision fender structure based on the crash resistance index to obtain a collision avoidance with better energy absorption capacity.The structure of the fender adopts the actual ship collision analysis to determine the energy absorption effect of the structure.According to the requirements of ship impact energy,the design methods and criteria of corrugated sandwich anti-collision fenders are proposed,which provide a reference for the design of this structure.On this basis,the actual ship test plan is designed to provide a basis for the later actual ship collision test.The main contents are as follows:Introduce the crashworthiness index,through the quasi-static finite element calculation of the anti-collision fender,the overall performance index of the fender is studied,and the structure of the fender is changed at the same time,and the quasi-static calculation under different working conditions is carried out to study the performance of the fender.The sensitivity of these different structural forms and sizes can determine the optimal design parameters of the anti-collision fender and be used for optimal design.Based on the main factors affecting the performance of corrugated sandwich anticollision fenders obtained from the previous analysis,including the main dimensions of the corrugated sandwich,the number of layers of corrugated sandwiches and the thickness of each part of the plate,the sample design of the overall size of the fender was determined by the orthogonal experiment method.An energy-based optimization design method is proposed,which selects a plate thickness design with a better crashworthiness index and a plate thickness design with the lowest overall stiffness under the premise of meeting the energy absorption requirements.Numerical methods are used to simulate the dynamic process of a ship impacting an anti-collision fender,obtain the ship’s impact force,and determine various specifications(500-ton,1000-ton,and 2000-ton)fenders that meet the bridge crash resistance standards.Design the actual ship impact test program according to the principle of equivalence,and verify the feasibility of the program through numerical simulation calculation.According to the results of the numerical simulation analysis,the test conditions and the data acquisition equipment plan are determined to provide the basis for the next real ship collision test. |
