Numerical Analysis on Vehicle Collision onto Guard Fence

日本于1999年4月颁布了新的护栏规范，对护栏的性能进行了规定。新规范要求在设计护栏时，必须进行足尺试验，以检验护栏的性能。然而，由于大量的时间和成本消耗，难以在现场测试全尺寸防护栅栏的性能，以进行碰撞参数检测。在本研究中，使用有限元素法的数值分析程序的护栏和车辆处理，以补充现场实验。首先，对钢和铝合金材料进行了实验，得到了考虑应变率效应的应力应变关系，并将其用于数值分析。在钢护栏的情况下，考虑应变率效应的分析结果与现场碰撞实验结果一致。在铝合金护栏的情况下，有和没有应变率效应配置的结果差异很小。

The performances of the guard fence were prescribed in the new code of the guard fence issued in April 1999 in Japan. In the new code, the full-scale experiment for checking the performances of guard fences is required in the design of the guard fence. However, it is difficult to test the performance of full-scale guard fences in the field for the collision parametric examination because of the enormous time and cost consumption. In this study, the numerical analysis procedures using finite element method for both guard fences and vehicle are dealt with to complement the field experiments. Initially, the materials of steel and aluminum alloy are experimented to obtain the stress-strain relationship considering the strain rate effect, which is used in the numerical analyzes. In the case of steel guard fence, the results of the analyzes considering the strain rate effect agree with the results of the field collision experiment. In the case of aluminum alloy guard fence, the differences of results with and without the stain rate effect configuration are very little.