Influence of Alignment Indexes of Highway Turning Section on Safety Performance of Concrete Guardrail

doi:10.12141/j.issn.1000-565X.220789

Abstract

Abstract:

The alignment design indexes of highway turning section have important influences on the safety performance of guardrail. In this paper, based on the finite element software LS-DYNA widely used in the field of highway side safety, a complex collision test model of truck and concrete guardrail is established, and simulation and vehicle tests are performed to comparatively verify the effectiveness of the model. Detailed animation describing the collision of vehicle to guardrail is obtained by simulation, which directly exhibits the safety performance of the guardrail in flat curve section. Then, the traffic lane radius, the superelevation value and the vehicle speed are used as variables to investigate and quantify the influence of main alignment indexes on the safety performance of concrete guardrail. The results show that, when the traffic lane radius is close to the ultimate minimum radius corresponding to the design velocity, the roll-over-angle of the vehicle increases, and the vehicle easily crashes to the guardrail and rolls over; that a superelevation value of 6% of the traffic lane is the critical point for the safety performance of concrete guardrail; that when the superelevation value is more than 6%, the height of the vehicle climbing along the collision surface of the guardrail may increase, and the vehicle is more likely to roll over, so that the combination of large superelevation (above 6%) and small ultimate minimum radius should be avoided during the highway design; and that, on the curve section, the collision speed has a significant impact on the safety performance of guardrail. For the integral van, the risk of rollovers significantly increases when the vehicle speed reaches 90 km/h. This research lays a theoretical foundation for the alignment safety design of highway curve sections.

Key words: highway engineering, highway alignment index, concrete guardrail, impact test, safety performance

CLC Number:

U412.3

YANG Yonghong, TANG Zude, WANG Chun, et al.. Influence of Alignment Indexes of Highway Turning Section on Safety Performance of Concrete Guardrail[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(1): 90-99.

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References 21

1	OFFICIALS T ．Manual for assessing safety hardware，2009［M］．［S.l.］：AASHTO，2009．
2	STOUT D， HUGHES W， MCGEE H T ．Traffic barriers on curves，curbs，and slopes［R］．［S.l.］：Turner-Fairbank Highway Research Center，1993．
3	MOLAN M A， KSAIBATI K ．Factors impacting injury severity of crashes involving traffic barrier end treatments［J］．International Journal of Crashworthiness，2021，26（2）：202-210．
4	RUSSO B J， SAVOLAINEN P T ．A comparison of freeway median crash frequency，severity，and barrier strike outcomes by median barrier type［J］．Accident Analysis & Prevention，2018，117：216-224．
5	MOLAN M A， REZAPOUR M， KSAIBATI K ．Modeling the impact of various variables on severity of crashes involving traffic barriers［J］．Journal of Transportation Safety & Security，2020，12（6）：800-817．
6	MARZOUGUI D， KAN C S， DOLCI S，et al ．Modeling and simulation of vehicle crashes on curved，superelevated road sections［C］∥Proceedings of the First International Roadside Safety Conference．San Francisco：Transportation Research Board，2017．
7	张晶，白书锋，石红星，等．车辆与弯道混凝土护栏碰撞的动态数值模拟及试验［J］．中国公路学报，2007，20（1）：102-106．
	ZHANG Jing， BAI Shu-feng， SHI Hong-xing，et al ．Dynamic numerical simulation and experiment for vehicle and curved concrete barriers crush［J］．China Journal of Highway and Transport．2007，20（1）：102-106．
8	雷正保，彭作，刘兰，等．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，et al ．The optimal design of collision characteristic of curve-road concrete barrier［J］．Journal of Vibration and Shock，2009，28（5）：6-9．
9	韩海峰，杨轸，郑挺．高速公路路侧护栏碰撞能量需求研究［J］．公路交通科技，2016，33（12）：118-124．
	HAN Hai-feng， YANG Zhen， ZHENG Ting ．Study on collision energy requirement for expressway roadside guardrail［J］．Journal of Highway and Transportation Research and Development，2016，33（12）：118-124．
10	National Highway Traffic Safety Administration ．Crash report sampling system （CRSS）［R］．［S.l.］：National Highway Traffic Safety Administration，2021．
11	National Highway Traffic Safety Administration ．Fatality analysis reporting system （FARS）［R］．［S. l.］：Na-tional Highway Traffic Safety Administration，2021．
12	崔鹏飞．货车专用匝道超高取值仿真评价［J］．路基工程，2022（1）：139-145．
	CUI Pengfei ．Simulation evaluation of ultra-high value of special ramp for trucks［J］．Subgrade Engineering，2022（1）：139-145．
13	甘新众，甘有为，刘群艳，等．半挂车撞击公路护栏时的等效模型［J］．中外公路，2020，40（1）：258-262．
	GAN Xinzhong， GAN Youwei， LIU Qunyan，et al ．Equivalent model when semi-trailer hitting highway guardrail［J］．Journal of China & Foreign Highway，2020，40（1）：258-262．
14	方乐，曾玉烨，陈林．针对轻型与中型卡车撞击桥墩的通用车辆力学模型［J］．自然灾害学报，2021，30（4）：92-101．
	FANG Le， ZENG Yuye， CHEN Lin ．General vehicle mechanical model for light and medium trucks crashing into bridge piers［J］．Journal of Natural Disasters，2021，30（4）：92-101．
15	CHEN L， WU H， LIU T ．Shear performance evaluation of reinforced concrete piers subjected to vehicle collision［J］．Journal of Structural Engineering，2020，146（4）：4020026．
16	公路护栏安全性能评价标准：［S］．
17	公路交通安全设施设计规范：［S］．
18	POLIVKA K A， FALLER R K， SICKING D L，et al ．Performance evaluation of the permanent New Jersey safety shape barrier-update to NCHRP 350 Test No. 4-12 （2214NJ-2）［R］．Lincoln：Mid-America Transportation Center，2006．
19	RAY M H， MONGIARDINI M， ANGHILERI M ．Development of the roadside safety verification and validation program［EB/OL］．［2022-08-13］．．
20	公路路线设计规范：［S］．
21	公路交通安全设施设计细则：［S］．

参数类别	参数名称	规范值	模拟值
质量	车辆总质量/kg	10 150±150	10 011
质量	整备质量/kg	4 450±500	5 225
几何尺寸^2）	前轮轮距/mm	1 730	2 045
	车轮半径/mm	460	482
	轴距（最远轴）/mm	3 870	5 301
	车辆总长/mm	7 040	8 565
	车辆总宽/mm	2 290	2 440
	货厢底板高度/mm	1 080	1 166
配载重心位置	距地面高度^3）/mm	1 410	1 708
配载重心位置	距纵向中心线的横向距离/mm	±100	10

防护等级	代码	H	H₁	B	B₁	B₂
三	A	81	55.5	46.4	8.1	5.8
四	SB	90	64.5	48.3	9.0	6.8
五	SA	100	74.5	50.3	10.0	7.8
六	SS	110	84.5	52.5	11.0	8.9

姿态角	Sprague-Geers指标			残差分析
姿态角	幅度/%	相位/%	结果评价	均值/%	标准差/%	结果评价
偏航角	-13.5	6.9	满足	9.5	15.4	不满足
翻滚角	3.9	2.9	满足	-0.5	5.7	满足
俯仰角	112.5	19.0	不满足	-77.4	40.9	不满足

车速/（km·h^-1）	护栏等级	行车道半径/m	超高/%	车辆总质量/t	碰撞角/（°）
60	三（A）级	125，200，300，400	4，5，6，7，8	10	20
80	四（SB）级	250，400，800
100	六（SS）级	400，800，1 200

车速/（km·h^-1）	护栏等级	行车道半径/m	超高/%	路肩宽度/m	路肩横坡/%
60	三（A）级	125，200，400	4，5，6，7，8	3	3
80	四（SB）级	250，400，800
100	六（SS）级	400，800，1 200