Research On Anti-Collision Structure Design Of Bridge Pier Based On Waste Tires

With the rapid development of the transportation industry,the number of Bridges and navigable ships is increasing day by day,resulting in an increasingly obvious contradiction between Bridges and navigable ships.The collision of ship and bridge will not only damage the bridge structure and threaten the normal service life of the bridge,but also cause serious casualties and huge property losses.Therefore,it is very effective and necessary to fully study the characteristics of collision between ship and bridge and to take active and effective anti-collision measures,which is also the focus of this paper.Based on the reuse of the used tire,this paper designs a kind of anti-collision structure of the used tire of bridge pier suitable for the collision of small tonnage ships.The main work of this paper revolves around the design and performance analysis of the anti-collision structure of the used tire of bridge pier.The main research contents and results of this paper are as follows:The main work of this paper is as follows:(1)Based on waste tyre recycling waste tyre rotor structure design for a single,and multiple waste tyre rotator assembling structure composition,design a suitable for small tonnage of ships collision new pier anticollision structure,make it under ship collision can meet "lateral hit Bo Zhuan bow,decrease the damage while positive impact" of the functional requirements.(2)This paper introduces the theory and method of numerical simulation analysis of ship bridge collision,and USES LS-DYNA software to simulate the ship impact on a double pillar pier.The results show that: the higher the ship impact velocity is,the greater the ship impact force is,the greater the pier top displacement is,and the ship bridge contact time increases linearly.The larger the ship mass is,the larger the pier top displacement is,the larger the bridge contact time and the peak impact force are.The peak stress of the pier occurs at the bottom of the pier.When a 500 t barge hit the pier at different angles(10°,20°,30°,40° and 50°)at a speed of 2m/s,when the impact Angle was less than 30°,the peak impact force increased with the increase of the impact Angle;when the impact Angle was greater than 30°,the impact force decreased slightly with the increase of the impact Angle.When the impact Angle is 30° and 40°,the displacement of the xdirection pier top is obviously larger than that of the other impact angles,and the displacement of the Y-direction pier top increases with the increase of the impact Angle.The peak stress of the pier occurs at the bottom of the pier.(3)This paper analyzes the anti-collision property of the single waste tire rotating body,which is the main component in the anti-collision structure of bridge pier.When a rigid body ship hits a rotating body structure of a single tire at different angles: during the contact between the rigid body ship and the rotating body structure,when the impact Angle is less than or equal to 40°,the larger the impact Angle is,the smaller the roll Angle of the bow will be.When the impact Angle is greater than 40° and less than or equal to60°,the greater the impact Angle,the greater the roll Angle of the bow;When the impact Angle is greater than 60°,the larger the impact Angle is,the smaller the roll Angle of the bow will be.When a rigid body ship hits a rotating body structure of a single tire at different speeds: during the whole impact process,at the same time,the greater the impact speed,the greater the turning Angle of the bow;The larger the impact velocity is,the smaller the velocity loss rate is in the X direction and the larger the velocity increment is in the Y direction.The higher the impact velocity,the higher the peak value of impact force,and the higher the energy conversion rate of the system at the same time.(4)When a 500 T barge collided head-on with the pier with the protected structure at a speed of 30° and 2m/s,the bow roll Angle was 3.27°,and the energy conversion rate of the system was 23%.Compared with the bare pier,the maximum impact force of the pier is reduced by 81.1%,the maximum stress of the first and third principal stress of the pier is reduced by 38.3% and 45.1% respectively,the stress of reinforcement inside the pier is reduced by 71.0%,and the maximum stress of the ship is reduced by 54.2%.(5)When a 500 T barge collided head-on with the pier with the protected structure at a speed of 20° and 2m/s,the bow roll Angle was 1.43°,and the system energy conversion rate was 20.8%.Compared with the naked pier,the maximum impact force of the pier is reduced by 74.8%,the maximum stress of the first and third principal stresses of the pier is reduced by 43.2% and 58.4% respectively,the stress of reinforcement inside the pier is reduced by 65.0%,and the maximum stress of the ship is reduced by 46.9%.(6)When a 500 t barge is hitting the pier with a protective structure at a speed of2m/s,the anti-collision structure consumes the ship’s kinetic energy through its own deformation.Compared with the naked pier,the maximum impact force of the pier is reduced by 89.6%,the maximum first and third principal stresses of the pier are reduced by 67.6% and 22.4% respectively,the stress of reinforcement inside the pier is reduced by 79%,and the maximum stress of the ship is reduced by 34.1%.(7)By comparing the impact response of the pier with and without protection,the following conclusions can be drawn: the functional effect of the used tire anti-collision structure of the pier meets the original design intention,and the energy dissipation effect analysis,force effect analysis,motion and deformation effect analysis reach the expected goal.