Mechanical Behaviors Study On The Collision Process Between Vehicles And Piers

With the vigorous development of transportation in our country,the probability of automobile and pier collision is increasing. Therefore, the research on automobile collision with bridge pier is necessary, This paper bases on the nonlinear dynamic analysis software LS-DYNA to research this problem, the main work is as follows:Firstly,this paper briefly reviews the research situation and introduces the characteristics of LS-DYNA.In the second chapter, the paper establishes a finite element model of vehicle collision with pier. Analyzes the response of different sections under impacting. Initially proposes the view that contact form should be considered during the process of impacting. In addition, analyzes different concrete models and reinforcement rato on the effect of pier impact response.In the third chapter, the paper establishes a collision model with truck with whole bridge. Research shows that:the vehicle weight and speed will increase the impact force and the displacement of the pier top. The contact stiffness will lead to changes in growth rate. When the impact energy is same, the energy of the composition with a large velocity will lead the maximum impact force to appear earliest, the composition with a large mass will have the biggest equivalent static force and the time domain of impact force is the longest.when the quality and speed are all relatively large, the impact force is the biggest. Displacement of the top of pier is most sensitive to the impact quality. The concrete strength raises can reduce the displacement of the top of pier, but it will increase the impact force. In addition, the upper structure has little effect on the impact force, the error of all simplified models are very little.