弯道混凝土护栏碰撞特性的优化设计

雷正保;彭作;刘兰;侯石静

振动与冲击 ›› 2009, Vol. 28 ›› Issue (5) : 6-9.

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振动与冲击 ›› 2009, Vol. 28 ›› Issue (5) : 6-9.
论文

弯道混凝土护栏碰撞特性的优化设计

  • 雷正保1,彭作2,刘兰3,侯石静2
作者信息 +

The optimal design of collision characteristic of curve-road concrete barrier

  • LEI Zhengbao1,2,PENG Zuo3,LIU Lan2,HOU Shijing2
Author information +
文章历史 +

摘要

摘要:平曲线半径不足400米的弯道是交通事故率最高的路段,由于缺乏对弯道护栏的研究,人们不得不在弯道上长期使用直道护栏。要改变目前这种无论弯道、直道,均一律使用直道护栏的不合理现象,就必须获得弯道半径为400米时的混凝土护栏最佳尺寸参数。为此,本文以NJ型混凝土护栏尺寸参数为参考基础,以防撞等级为SS级的护栏为研究目标,以大型客车总质量为18t、碰撞速度为80km/h、碰撞角度为20°的碰撞条件为研究工况,基于eta/VPG及Ls-dyna软件平台及“汽车-护栏-弯道”一体化车-路系统动力学模型,联合应用正交试验设计方法及动态显式有限元方法,以客车后轮抬高量为考核指标,对控制弯道混凝土护栏截面形状的6个设计变量,应用L25(56)正交试验表安排仿真试验,借助SPSS统计软件包,对仿真试验结果进行了方差分析,找出了各因素对结果的影响程度,并据此确定了弯道混凝土护栏的最佳尺寸参数。对25组仿真试验结果的分析发现,大型客车撞击弯道半径为400米的混凝土护栏时,发生的弯道事故全是翻车事故,且主要表现为客车翻越混凝土护栏而坠向护栏外侧悬崖的事故模式。优化设计结果表明,增加混凝土护栏的高度是抑制大型客车翻越护栏的重要途径,合理的弯道混凝土护栏尺寸参数,可以将翻车事故控制在护栏内侧,以避免重大恶性事故的发生,且控制弯道混凝土护栏截面形状的6个设计变量对弯道事故的影响,存在如下优先级关系:下斜坡高度>底部凸缘高度>上斜坡高度>顶部宽度>下斜坡宽度>上斜坡宽度,即高度的影响较宽度的影响要显著,下斜坡高度的影响又较上斜坡高度的影响显著。

Abstract

ABSTRACT:The road with a Curve radius less than 400 meters has the highest rate of traffic accidents, and we have to use the straight-road barrier on curve-road for the lack of research on curve -road barrier. To change this unreasonable situation, we must obtain the optimal parameters of concrete barrier with curve radius of 400 meters. Therefore, this paper takes barrier with safety grade of the SS into account base on the research of parameters of the NJ-concrete-barrier. The total mass of research bus model is 18 t, the collision speed is 80 km / h, and the collision angle is 20 °, based on the ETA / VPG and LS-DYNA software platform and " vehicle – barrier – curve-road" integration vehicle - road system dynamics model, the research use combination of orthogonal experimental design methods and dynamic explicit finite element method. The research sets the rear wheel elevation as criteria for the evaluation and creates six cross-section shape design variables. The application of L25(56) Orthogonal table for simulation and the using of SPSS statistical package helps the variance analysis of simulation results, we find out the results of various factors on the degree of influence, then determine optimal parameters of concrete barrier. 25 Groups of the simulation results show that overturn accident occurred to all when large bus collide concrete barrier with a radius of 400 meters, and then bus run out of concrete barrier and fall down to cliff outside of the barrier. The optimal design results showed that the increasing in height of the concrete barrier is a important way to protecting bus from running out of barrier, and a concrete barrier with reasonable parameters can control the overturn-accident occurs inside, then avoid the occurrence of major badly-damaged accidents. The six cross-section variables which determined the sharp of the barrier have impact on the accident, the existence of priorities as following: height of lower slope> height of flange at the bottom > height on the upper slopes> top width> width of the lower slope > width of the upper slope, and the influence of height factors is greater than that of width, the height of lower slopes impact more significantly than that of the upper.

关键词

交通工程 / 混凝土护栏 / 碰撞 / 正交试验设计 / 方差分析 / SPSS

Key words

KEY-WORDS: traffic engineering / concrete barrier / impact / orthogonal design / analysis of variance / SPSS

引用本文

导出引用
雷正保;彭作;刘兰;侯石静. 弯道混凝土护栏碰撞特性的优化设计 [J]. 振动与冲击, 2009, 28(5): 6-9
LEI Zhengbao;PENG Zuo;LIU Lan;HOU Shijing. The optimal design of collision characteristic of curve-road concrete barrier[J]. Journal of Vibration and Shock, 2009, 28(5): 6-9

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