汽车碰撞砼护栏过程的简化分析

A Simplified Analysis of Vehicle Impact Process with Concrete Barrier

将汽车与砼护栏简化为刚体。首先从阿沛尔(Appell)方程出发,以刚体质心速度和刚体角速度作为准速度推导刚体碰撞方程。在对汽车碰撞砼护栏过程进行适当简化后,利用刚体碰撞方程可以求出碰撞过程中汽车所承受的最大平均加速度、最大侧倾角以及汽车脱离砼护栏时的弹出角等用于全面评估砼护栏安全性能的重要参数,从而给出一较为简单的、具有半解析性质的砼护栏安全性能评估方法。

Both the vehicle and the concrete barrier are regarded as rigid bodies. An impact equation represented by pesudo-velocities(velocity of vehicle centroid and angular velocity of vehicle) is derived from Appell equation. Under some simplified conditions, a semi-analytical method based on the impact equation is obtained, which can figure out the maximum average accelerations; the maximum roll angle and the exit angle, which can be used to evaluate the safety performance of concrete barrier comprehensively.