波形梁护栏结构参数对防撞性能的影响

Influence of Structure Parameters on W-beam Guardrail Crashworthiness

护栏板和立柱是波形梁护栏的主要组成结构,为分析结构参数的变化对波形梁护栏防撞性能的影响,基于动态显式有限元法和LS-DYNA软件,建立了车辆-护栏碰撞动力学模型,以护栏板厚度和立柱厚度为设计变量,每个设计变量考虑4个水平,对8组不同结构参数组合的波形梁护栏进行汽车碰撞仿真试验,并对各工况计算结果进行分析。结果表明:板厚度为3.5mm、立柱厚度为4.5mm的组合和板及立柱厚度均为4.0mm的组合满足护栏防撞性能要求,与现行规范中波形梁护栏相比,二者在材料费用上分别节省12.5%和11.2%。

Guardrail plate and posts were the main structures of w-beam guardrail. In order to analyze the influence of structure parameters on w-beam guardrail crashworthiness, vehicle-guardrail collision system dynamics model was estab- lished by dynamic explicit finite element method and LS-DYNA software. The thickness of guardrail plate and of post were taken as design variables, each variable had 4 levels. 8 groups collision simulation tests of w-beam guardrail with dif- ferent structure parameter combinations were carried, and the results of different conditions were analyzed. Results show that the combination of plate thickness 3. 5 mm and post thickness 4. 5 mm and the combination of plate and post thick- ness 4.0 mm meet crashworthiness requirements. Compared with the current standard w-beam guardrail, they save by 12.5% and 11.2% in material cost respectively.