Numerical Simulation And Analysis Of Barge Collision With Dock Pier

In recent years,with the development of inland navigation,the collision between barge and dock structure has occurred from time to time,which poses a serious threat to public property and personal safety.Therefore,the research on the collision mechanism between barge and dock structure has important practical significance.In this paper,a detailed nonlinear finite element model of barge-to-pier impact is established by ANSYS,and the model is numerically calculated by LS-DYNA program.The barge-pier impact force mechanism,impact force and pier response were analyzed and compared with specifications.The main contents and conclusions of the paper are as follows:(1)The ANSYS/LS-DYNA was used to establish the numerical model of the barge-pier impact.The difference between the calculated results of different pier materials was compared.The results show that the impact force obtained by the assumption that the pier is rigid or elastic material is too large,and the difference between the peak impact force and the actual situation increases with the increase of the impact velocity.(2)The effects of barge mass and impact velocity on the peak impact force were compared and analyzed.When the impact velocity is small,the peak impact force has a significant increase with the increase of the barge mass.For the impact velocity of 1.0m/s,increasing the barge mass has no significant effect on the peak impact force.For heavier ships,the peak impact force increases with the impact velocity is relatively slower than lightly loaded ships.When the impact velocity is 1.0 m/s,the peak impact force tends to be constant.(3)The differences between impact force,pier response and system energy variation obtained by the barge-pier impact model and the barge-fender-pier impact model were compared.The rubber fender can reduce the impact force by about 80%,and the collision duration is about 3 times that of no rubber fender.When there is no rubber fender,the kinetic energy in the early stage of the impact is lower than that of the rubber fender.When the impact velocity is 0.4m/s and 1.0m/s,the difference of the peak impact force of the super arch fender and the D-type fender is 0.86MN and 0.45MN,and the difference of the maximum displacement of the pier top is 0.06m and 0.035m.It shows that the gap between the two fenders on the time history curve of the impact force and the pier top displacement is weakened when the impact velocity is large.(4)The effects of barge mass,impact velocity,impact position and impact angle on the impact results are discussed.The results show that the impact velocity is the decisive factor of the impact force,and as the impact velocity increases,the displacement of the pier top also has a larger increase.The load of the barge has less influence on the impact force,but the greater the load of the barge,the collision duration and the displacement of the pier top will increase significantly.The impact position has almost no effect on the impact force time history,but a higher impact position will result in a larger pier top displacement.When the barge is at an angle to the front edge of the pier,the smaller the angle,the smaller the impact force generated.It is safer when the angle is less than 30°,and more than 300 will cause plastic damage to the pier.(5)The order of the nonlinear finite element simulation value of the barge-pier impact model is compared with the specification values:Eurocode>Code for Design on Railway Bridge and Culvert>finite element simulation value>AASHTO.The comparison results of the two impact models show that the impact force difference between the two impact models increases with the increase of the impact velocity at the light load,and is basically the same at the heavy load.The impact force difference of the two impact models at low velocity increases with the increase of the barge mass,but decreases with the relatively large impact velocity.