新型预制拼装防撞护栏防撞性能研究

Analysis on Anti-collision Performance of New Prefabricated and Assembled Guardrails

摘要:

为研究一种新型UHPC预制装配式防撞栏杆的防撞性能，以某城市桥梁为工程背景，基于ABAQUS软件建立数值分析模型，在1.5 t小型客车、18 t大型客车和33 t大型货车三种工况下进行实车模拟碰撞仿真，分析不同车辆类型撞击护栏时车辆的运行轨迹、护栏撞击点区域的应力分布和损伤情况，以及护栏的变形、速度、加速度的动力时程响应，研究UHPC预制装配式防撞栏杆的安全性能。结果表明，护栏对大型货车以阻挡作用为主，对小型客车以导向作用为主，预制护栏能够有效阻挡车辆冲出桥梁；车辆撞击时，护栏的损伤部位主要出现在撞击段，对相邻段护栏影响较小；车辆撞击作用下，护栏与UHPC界面处的应力最大，应对两者界面处进行特别设计。

Abstract:

In order to study the anti-collision performance of a new type of UHPC prefabricated and assembled guardrail, taking an urban bridge as the engineering background, and based on ABAQUS software, a numerical analysis model was established. The real vehicle collision simulation was carried out under three working conditions of 1.5 t minibus, 18 t bus and 33 t truck to analyze the vehicle trajectory, the stress distribution and damage in the impact point areas of guardrail, and the dynamic time-history response of deformation, speed and acceleration of guardrail, and to study the safety performance of UHPC prefabricated and assembled anti-collision guardrails. The results show that the guardrail is mainly used to stop large trucks and mainly used to guide minibuses. The prefabricated guardrail can effectively prevent vehicles from rushing out of the bridge. When a vehicle collides, the damaged parts of the guardrail mainly appear in the collision section, which has little influence on the adjacent guardrail. The stress at the interface between guardrail and UHPC is the largest under the impact of vehicles. Therefore, the interface between guardrail and UHPC should be specially designed.