关键词: 道路工程, 分离式混凝土护栏, 碰撞

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