城市快速路桥梁护栏碰撞条件分析

结合依托工程,参考国内外相关标准,综合城市快速路桥梁交通流状况,按照规范要求分别确定出桥侧护栏和中分带护栏碰撞条件。经过研究确定:桥侧护栏防撞等级为SS级,防撞能量为520kJ,其碰撞试验条件组合为小型车采用1.5t小客车以100km/h的速度和20°的角度碰撞护栏、大型车采用18t大客车以80km/h的速度和20°的角度碰撞护栏;中分带护栏防撞等级为Am级,防撞能量为160kJ,其碰撞试验条件组合为小型车碰撞采用1.5t小客车以100km/h的速度和20°的角度碰撞护栏、大型车碰撞采用10t大客车以60km/h的速度、20°的角度碰撞护栏。研究表明,基于该碰撞条件设计验证的护栏,能够有效防护失控车辆,降低事故发生的概率,减少事故造成的损失,提高城市道路交通安全水平。

Analysis on Impact Test Conditions of Bridge Guardrail of Urban Expressway

Based on the project, consulting the relevant standards at home and abroad, combining with the condition of urban expressway bridge traffic flow, the impact test conditions of bridge-side guardrai] and medium guardrail are confirmed according to the specifications. The research confirms that： the anti-collision level of bridge-side guardrail is SS, its anti-collision energy is 520kJ, and its impact test condition is as follow： a car, whose weight is 1.St, impacts guardrail with the speed of 100km/h and the angle of 20°, meanwhile a coach, whose weight is 1St, impacts guardrail with the speed of 80km/h and the angle of 20°; the anti-collision level of medium guardrail is Am, its anti-collision energy is 160kJ, and its impact test condition is as follow： a car, whose weight is 1.5t, impacts guardrail with the speed of 100km/h and the angle of 20°, meanwhile a coach, whose weight is 10t, impacts guardrail with the speed of 60km/h and the angle of 20°. The research result indicates that the guardrail designed and Validated based on the above impact conditions can effectively protect the out-of-con- trol vehicles, reduce the probability of accident and the losses caused by accidents, and improve urban road traffic safety.