装配式防撞护栏方案与车辆碰撞仿真性能分析
Performance Analysis of Assembled Crash Barrier Scheme and Vehicle Crash Simulation
陈镇 1付军 2李贯超 2黄豪杰 2柯文汇 1闵亦斌2
作者信息
- 1. 武汉市市政工程机械化施工有限公司 武汉 430023
- 2. 武汉理工大学船海与能源动力工程学院 武汉 430063
- 折叠
摘要
本文以武汉市某大道高架桥SA级装配式混凝土防撞护栏为工程背景,提出了一种新型C40混凝土装配式防撞护栏竖向连接设计方案,即预埋H型钢焊接与浆锚连接相结合,护栏节段之间通过钢筋连接.基于LS-DYNA分别建立了 1.5 t小型客车、14 t大型客车和25 t大型货车20°斜向撞击装配式护栏的有限元模型.通过阻挡性能、缓冲性能和导向性能等评价指标,评价装配式防撞护栏的安全性能.结果表明:在车辆碰撞作用下,护栏的竖向连接与纵向连接均未失效,护栏具备良好的阻挡性能.碰撞过程中,纵向加速度分量峰值和横加速度分量峰值均低于200 m/s2,满足标准中加速度评价指标,护栏具备良好的缓冲性能.碰撞结束后,小客车驶出角度为7.8°,大型客车与大型货车驶离护栏轨迹几乎平行与护栏,满足规范要求,护栏具备良好的导向性能.
Abstract
Based on the engineering background of SA-class assembled concrete crash barrier of a via-duct in Wuhan,a new vertical connection design scheme of C40 assembled concrete crash barrier was proposed,that is,the embedded H-beam welding was combined with the mortar anchor connection,and the guardrail segments were connected by steel bars.Based on LS-DYNA,the finite element models of 1.5t minibus,14t bus and 25t truck impacting assembled guardrail at an oblique angle of 20° were established respectively.The safety performance of assembled anti-collision guardrail was evalu-ated through the evaluation indexes such as blocking performance,buffering performance and guiding performance.The results show that the vertical connection and longitudinal connection of the guard-rail have not failed under the action of vehicle collision,and the guardrail has good blocking perform-ance.During the collision,the peak values of longitudinal acceleration component and transverse ac-celeration component are both below 200 m/s2,which meet the acceleration evaluation index in the standard,and the guardrail has good cushioning performance.After the collision,the exit angle of the passenger car is 7.8°,and the trajectories of the large passenger car and the large truck leaving the guardrail are almost parallel to the guardrail,which meets the requirements of the code and the guard-rail has good guiding performance.
关键词
装配式混凝土护栏/竖向连接/有限元分析/车辆碰撞/安全评估Key words
assembled concrete guardrail/vertical connection/finite element analysis/vehicle colli-sion/safety assessment引用本文复制引用
出版年
2024
NETL
NSTL
万方数据