Design and research of bridge anti-vehicle collision device based on stiffness matching

In order to reduce the damage caused by vehicle-bridge collisions and improve the safety of road vehicles, a design method based on stiffness matching was proposed. The vehicle-device-bridge dynamic model was established. The optimal design of the vehicle-collision prevention device for bridges was carried out based on stiffness matching. The collision models were established by using Ls-dyna finite element analysis software, and the protective performance of the collision prevention device for car and truck under typical working conditions were studied. The results show that the stiffness of the anti-collision facility is inversely proportional to the deformation and directly proportional to the impact force. Compared with the impact of bare piers, the peak value of the impact force is obviously reduced after the anti-collision device is added. due to the different rigidity of the vehicle, the maximum peak value of the car is reduced by 40% and the maximum peak value of the truck is reduced by 33.6%. The curve is smooth and the peak arrival time is prolonged, thus achieving a better energy consumption buffering effect. The anti-collision device designed by stiffness matching has strong applicability and can exert better anti-collision and energy consumption effects under different collision conditions.