公路护栏冲击响应的有限元分析

he accident that vehical impact guardial system is ordinary.Vehicle traffic accident rate is increasing with the increase of vehical numbers. Security is an important subject in the field of transportation. Research on how to predict the impact responses of the guardrail system and to improve the guardrail protection capability becomes very important for minimizing passenger injury.Thin-wall obstruction block structure plays a significant role in energy absorbing guardrail systems. In this paper, we utilized the commercial finite element software LS-DYNA to investigate the impact response crashed by a mass block for the single-span multi-grid obstruction block guardrail systems with three different wall thicknesses. Simulation results proved that two-grid obstruction block with the gauge of 2 mm exhibits the best final internal energy mass and energy absorbing density. The amplitude of internal energy response of two-grid obstruction block with the gauge of 2 mm is the biggest than others, and the amplitude of accelation response of two-grid obstruction block with the gauge of 3 mm is the biggest.The results show that the gauge affect on the impact responses poorly, the stiffness of the guardial system increases with the increase of the thickness. And the impact resistant ability is to enhance. We believe this study provides design guidelines on how to enhance the impact resistant ability and grade of guardrail system.