低等级混凝土护栏对厢式卡车撞击 桥墩作用的影响规律.

In order to study the influence law of highway barrier on the impact effects of vehicle collision with bridge piers, so as to reasonably evaluate the safety of the actual pier under vehicle collision, finite element method was employed to carry out simulations of a large-size van-type truck (Ford F800 ) impacting with a low-grade concrete barrier (New Jersey barrier) and barrier-pier system. The motion pattern of the truck after collision with barrier, truck-pier collision mechanism under the protection of the barrier and the impact force peaks of the vehicle, etc., were mainly investigated, and the protective effect of the barrier was further discussed. The simulation results show that under the protection of the barrier, the impact of this van-type truck on the pier depends mainly on the cargo impact, while the engine generally does not collide with the pier. Under certain impact conditions, the peak impact force of the vehicle on the pier may exceed the peak of the impact force when the barrier is not set, even more than twice the latter. When the pier is close to the barrier (e. g., less than 1. 5 m), this low-grade concrete barrier may have a negative effect on the pier against vehicle collision. [ABSTRACT FROM AUTHOR]