Abstract: When the height of divided concrete guardrail of the road median is insufficient due to the pavement overlay, it is necessary to heighten the guardrail to improve the protective performance of the guardrail. A kind of improved concrete guardrail with steel members installed on the concrete guardrail was proposed. The simulation analysis and real vehicle collision test were carried out for three types of vehicles, namely car, large bus and large truck. The changes of occupant acceleration a and vehicle gravity center height HG after car collision were studied, and the deformation of improved concrete guardrail support beam and crossbeam after large bus or large truck collision were studied. The results show that after car collision, both the longitudinal and the transverse components of vehicle occupant acceleration are not more than 200 m/s2; and after large bus or large truck collision, the supporting beam and crossbeam of the improved concrete guardrail are deformed and partially damaged, and the vehicle could run out normally. The protection level of the improved concrete guardrail can reach SAm level.

Key words: highway engineering, divided concrete guardrail, collision

摘要： 路面加铺导致中央分隔带分离式混凝土护栏高度不足时，需要加高护栏，以提升护栏的防护性能。提出了一种在混凝土护栏上安装钢构件的改进混凝土护栏；采用小轿车、大型客车及大型货车3种车型进行了仿真碰撞分析及实车碰撞试验，研究了小轿车碰撞后乘员加速度a、车辆重心高度HG的变化及大型客/货车碰撞后改进混凝土护栏支撑梁和横梁变形情况。结果表明：小轿车碰撞后，车辆乘员加速度的纵向和横向分量均不大于200 m/s2；大型客/货车碰撞后，改进混凝土护栏的支撑梁和横梁变形出现了部分损坏，车辆能正常导出；改进混凝土护栏的防护等级可达到SAm级。

关键词: 道路工程, 分离式混凝土护栏, 碰撞