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混凝土护栏坡面参数对防护车辆撞击作用的影响

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为研究混凝土护栏坡面参数对其防护车辆撞击作用的影响,建立车辆与护栏仿真模型,并利用实车试验数据验证模型有效性,采用经过验证的仿真模型,分别对不同坡度单坡面混凝土护栏、不同坡面参数组合改进型混凝土护栏以及加强型混凝土护栏阻爬坎功能进行碰撞分析,结果表明:坡度是影响单坡面护栏防护性能的关键参数,坡度偏小或者偏大均不能为车辆提供有效保护,在标准值80°参数条件下护栏综合防护性能相对较优;改进型护栏的斜面倾斜角度(α与β)、竖直方向高度(a、b及c)以及倾斜面宽度s是影响其防护性能的关键参数,在标准改进型坡面参数条件下,即α=84°、β=55°、s=12.5 cm、b=18 cm及c=7.5 cm时,护栏的综合防护性能相对较优;阻爬坎对于改进型护栏防护性能的提升作用不大,但与新泽西护栏组合后,护栏对于防车辆侧翻效果明显.
Influence of Concrete Barrier Slope Parameters on Protective Effect against Vehicle Collision
In order to study the influence of concrete barrier slope parameters on the protective effect against vehicle collision,the vehicle models and concrete barrier models were established.The validity of these models was verified using the real vehicle test data.Then,the collision analysis was conducted on the single-slope concrete barrier with different slopes,improved concrete barrier with different slope parameter combinations,and reinforced concrete barrier with anti-climbing function by using the validated models,respectively.The results show that the slope is the key parameter that affects the protective performance of the single-slope barrier,and vehicles cannot be effectively protected if the slope is too small or too large.The comprehensive protective performance of the barrier is relatively better under the standard parameter value of 80°.The slope angle(α and β),vertical height(a,b,and c),and slope width(s)of the improved concrete barrier are the key parameters affecting its protective performance.The comprehensive protective performance of the improved concrete barrier is relatively better under the condition of the standard slope parameters(α= 84°,β=55°,s=12.5 cm,b=18 cm,and c=7.5 cm).The anti-climbing function has little effect on improving the protective performance of the improved concrete barrier.However,the barrier will have an obvious effect on preventing vehicle rollover when combined with the new jersey safety barrier.

traffic engineeringconcrete barrier slopefinite element methodprotective performancesimulation modelcollision

龚帅

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北京华路安交通科技有限公司,北京市 100070

交通工程 混凝土护栏坡面 有限元方法 防护性能 仿真模型 碰撞

广东省交通运输厅科技项目

2017-02-009

2024

中外公路
长沙理工大学

中外公路

CSTPCD
影响因子:0.626
ISSN:1671-2579
年,卷(期):2024.44(2)
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