Research On Buffering Performance Of Steel-composite Anti-collision Facilities

At present,the number of bridges across rivers and seas under construction and built in our country has increased dramatically,and the number of navigable ships is also increasing,which increases the risk of ship collision with bridges invisibly.There are serious safety risks for bridge structures.In order to minimize the risk of ship collision,the method of installing anti-collision facilities on piers is usually adopted,which can protect bridges and ships at the same time.Aiming at the existing anti-collision facilities,this paper presents a steel-composite composite composite anti-collision sleeve,and optimizes its structure based on the principle of numerical simulation.The main research work of this paper is as follows:Firstly,Using finite element software PATRAN and LS-DYNA to establish pier model,1000 DWT,2000 DWT,3000 DWT tonnage ship model and steel sleeve,composite sleeve,steel-composite composite composite sleeve anti-collision facility model.Secondly,Finite element numerical simulation.The anti-collision performance of steel-composite composite composite case is analyzed and compared with that of 1000 DWT,2000 DWT and 3000 DWT ship with forward collision at speeds of 2m/s,3m/s and 4m/s respectively.The results show that for the three anti-collision facilities,the bigger the tonnage of the ship is,the more the peak reduction of the impact force is,the better the anti-collision performance is.For the anti-collision facilities with different speeds,the greater the impact velocity is,the greater the reduction of the impact force is,and the better the anti-collision effect of the device is.Comparing and analyzing the performance of steel-composite composite composite anti-collision sleeve box,the peak reduction rate of collision force and damage deformation degree of composite sleeve box are always smaller than composite sleeve box and bigger than steel sleeve box.The damage deformation of composite sleeve box is more serious than composite sleeve box and steel sleeve box,and the unit price of composite material is much higher than steel.So the steel-composite composite composite composite composite composite sleeve box is selected in this paper.The performance is the best.Thirdly,Optimum design of thickness ratio of steel-composite composite sleeve structure.In this paper,six groups of thickness ratios between steel box and composite sleeve are selected and simulated respectively.By analyzing and comparing the impacting force reduction,device energy absorption,damage deformation of sleeve and engineering cost,it is concluded that the steel-composite composite sleeve has the best anti-collision performance when the thickness ratio of steel box and composite sleeve is 5:5.Fourthly,On the basis of optimum thickness ratio of sleeve structure,the internal structure of steel box layer is optimized.Based on the principle of numerical simulation,the optimal layout of steel box layers is determined by changing the spacing between stiffeners and diaphragms and the thickness of steel plates.Finally,the transverse plate spacing is 0.75 m,the vertical plate spacing is 1.2m and the thickness of steel plate is 6mm.At this time,the reduction rate of ship collision force is 43.79%.