The Ship Hit Bridge Research Based On LS-DYNA Simulation

With China’s high-speed railway rapid development and transportation network ofcontinuous improvement, the construction of large bridges is also enlargeing. the ship hit thebridge substructure lead to damage or collapse accident occurred frequently, but the ship hitthe bridge of the research in China in recent years before they get enough attention. To thedesign of the bridge our standard formula for impact force is too small to withstand impactloads for bridge. Therefore, the studies and improvements of the reason of designspecifications for our ship hit the bridge formula is too small will not be ignored. In recentyears, the use of simulation software for the analysis of ship-bridge collision process has beenvery extensive, this paper is also based on LS-DYNA simulation software to study the impactof the ship and bridge, Main tasks are as follows:(1) combined LS-DYNA software theory and the author’s summary of the exposure classsimulation of the most common issues in detail. Such as: the hourglass problem, unit failure,the sliding interface energy, penetrating questions.(2) from China’s railway bridge design specifications impact force of the theoreticalderivation of the formula to find the cause of the impact force is too small because the elasticdeformation coefficient. Then simulated vessels of different speed and quality impact rigidwall, and analysis of the results fitted the elastic deformation coefficient improved formula.The accuracy of the improving formula were analyzed, and Results is very close to theEuropean norms in the formula. To arrive at the ship-bridge collision force to improve theformula is more reasonable.(3) With the simulation of different stiffness and quality ship impact pile and kinetic theoryderived by factors that affect the dynamic magnification factor. And finally summed up in acertain range of values of dynamic amplification factor method.(4) The ship impact bridge substructure of different materials model and of different locationsthrough software LS-DYNA simulation. Comparing the different locations under the impactof pile displacement, impact force, the dynamic magnification factor and Comparing differentmaterials model under the pile top displacement, the impact force, Summed up the ship hit thebridge a simplified model of the process is reasonable. The results show that, In the study ofthe impact force when the lower part of the bridge structure as a rigid wall is reasonable.Factors affecting the dynamic magnification factor and the value of the analysis onlyconsidered this case the ship hit cap is reasonable, Because of the impact location of thedynamic magnification factor of influence is relatively small.