Performance Analysis of Assembled Crash Barrier Scheme and Vehicle Crash Simulation
Based on the engineering background of SA-class assembled concrete crash barrier of a via-duct in Wuhan,a new vertical connection design scheme of C40 assembled concrete crash barrier was proposed,that is,the embedded H-beam welding was combined with the mortar anchor connection,and the guardrail segments were connected by steel bars.Based on LS-DYNA,the finite element models of 1.5t minibus,14t bus and 25t truck impacting assembled guardrail at an oblique angle of 20° were established respectively.The safety performance of assembled anti-collision guardrail was evalu-ated through the evaluation indexes such as blocking performance,buffering performance and guiding performance.The results show that the vertical connection and longitudinal connection of the guard-rail have not failed under the action of vehicle collision,and the guardrail has good blocking perform-ance.During the collision,the peak values of longitudinal acceleration component and transverse ac-celeration component are both below 200 m/s2,which meet the acceleration evaluation index in the standard,and the guardrail has good cushioning performance.After the collision,the exit angle of the passenger car is 7.8°,and the trajectories of the large passenger car and the large truck leaving the guardrail are almost parallel to the guardrail,which meets the requirements of the code and the guard-rail has good guiding performance.
assembled concrete guardrailvertical connectionfinite element analysisvehicle colli-sionsafety assessment
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