Effect of effective height of concrete barrier on protective performance
In order to study the effect of effective height of concrete barrier on its protective performance,the vehicle models and concrete barrier models were established,and the validity of these models were verified using the real vehicle test data.The verified simulation model was used to analyze the impact of single slope concrete barrier,new jersey slope concrete barrier,F-type slope concrete barrier and reinforced slope concrete barrier.The results show that under the condition of collision at 20 ° angle,1.5 t passenger car 100 km/h,25 t bus 85 km/h,and 55 t tractor 65 km/h,the vehicle running attitude after collision can be seen from the results.After the height of the barrier is reduced from 1.3 m to 1.1 m,0.9 m and 0.7 m respectively,it has little influence on the safety protection effect of small passenger cars.After it continues to decrease to 0.4～0.5 m,there are obvious climbing and rollover trends when the passenger car collides with the four types of guardrail.As the height of the concrete barrier gradually decreases from 1.3 m,the risk of the bus body rollover after the collision with the barrier increases.When the height is reduced to 0.9 m,the four types of guardrail on the slope are all in a near rollover state.As the height of the concrete barrier gradually decreases from 1.3 m,the rollover degree of the rear car of the tractor impact of the barrier increases,and the risk of rollover increases.When the height is reduced to 1.1 m,the vehicle almost rollover after hitting the barrier in the form of new Jersey slope,and the vehicle rollover occurs after the height continues to decrease.Among the four types of slope forms of concrete barrier,the climbing phenomenon is the most obvious when different vehicles collide with new jersey slope,and the roll value of large vehicles is larger after tail-throwing.
traffic engineeringconcrete barrier slopeheight of concrete barrierfinite element methodprotective performance
NETL
NSTL
万方数据
