Elaborate Numerical Simulation Of Collision Between Ship And Cross-sea Bridge

With the rapid development of the transportation industry,the number of large bridges across the sea is gradually increased and the span is constantly increased,which accelerates the economic development of var ious regions and forms magnificent landscapes,which makes the shipping route is more complex.At the same time,the ocean ship develop toward large-scale,quick speed,and port throughput is also increasing,so the bridge's contradiction with vessels become increasingly prominent,ship bridge of a bridge collision caused damage events have occurred in coastal and inland river channel,some scholars statistical analysis of the causes resulting in destruction bridge collapsed all found that for channel bridge,ship collision was the cause of destruction collapsed in the second,so for channel bridge,the bridge ship collision damage problem is very outstanding,and should make reasonable anti-collision design for the bridge and take the necessary protection.As a new method,finite element simulation(fem)is more and more popular among researchers and engineers for its unique advantages over other methods in reflecting the phenomenon of ship-to-bridge collision.Some scholars put forward that the size of the collision force is related to the speed and the mass,which is proportional to the speed and the square root of the mass,and put forward different specifications for calculating the collision force.In this paper,the modeling and analysis are carried out on the basis of pingtan strait bridge and jintang bridge,and the comparison is made with the existing finite element simulation analysis methods and specifications.The main work includes the following aspects:(1)Relevant measured data were found through literature reading,and three refined pier models were established and verified by modal analysis.(2)Numerical simulation of bridge collision in the navigable section,analysis of the impact of different parameters on the results,and draw a conclusion: if offset collision can greatly reduce the impact force;Soil mass under pile has little effect on impact force but great effect on displacement.When the collision velocity and mass are very large,the impact force does not increase with the increase of them,but is directly related to the bow stiffness.The effect of bow stiffness on the impact force is rarely seen in the literature.(3)The navigable section of the navigable section of the ship bridge collision numerical simulation,the analysis of the effect of different parameters on the results,and the most easy to damage position of the bridge is analyzed to define the bridge damage,the analysis found damage related to displacement of pile caps is the largest,the largest displacement of pile caps,the greater the damage is bigger,different forms of structure damage and displacement relationship is different,but are as the maximum displacement increases,studies have shown that the maximum displacement pile cap can be used in assessing damage.