华南理工大学学报(自然科学版) ›› 2024, Vol. 52 ›› Issue (1): 90-99.doi: 10.12141/j.issn.1000-565X.220789

• 交通运输工程 • 上一篇    下一篇

公路转弯段线形指标对混凝土护栏安全性能的影响

杨永红1 唐祖德1 王醇1,2 朱冠儒1,3   

  1. 1.华南理工大学 土木与交通学院,广东 广州 510640
    2.广东省隧道工程安全与应急保障技术及装备企业重点实验室,广东 广州 510545
    3.长沙理工大学 公路工程教育部重点实验室,湖南 长沙 410114
  • 收稿日期:2022-11-30 出版日期:2024-01-25 发布日期:2023-07-14
  • 作者简介:杨永红(1977-),女,博士,副教授,主要从事道路设计和安全研究。E-mail:yangyh@scut.edu.cn
  • 基金资助:
    广东省重点领域研发计划项目(2022B0101070001);广东省基础与应用基础研究基金资助项目(2021A1515011788);长沙理工大学公路工程教育部重点实验室开放基金资助项目(kfj190201)

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

YANG Yonghong1 TANG Zude1 WANG Chun1,2 ZHU Guanru1,3   

  1. 1.School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China
    2.Guangdong Provincial Key Laboratory of Tunnel Safety and Emergency Support Technology and Equipment,Guangzhou 510545,Guangdong,China
    3.Key Laboratory of Highway Engineering of the Ministry of Education,Changsha University of Science & Technology,Changsha 410114,Hunan,China
  • Received:2022-11-30 Online:2024-01-25 Published:2023-07-14
  • About author:杨永红(1977-),女,博士,副教授,主要从事道路设计和安全研究。E-mail:yangyh@scut.edu.cn
  • Supported by:
    the Key Area Research and Development Program of Guangdong Province(2022B0101070001);the Guangdong Provincial Basic and Applied Basic Research Fund(2021A1515011788)

摘要:

公路转弯段的线形设计指标对护栏的安全性能有重要影响。文中基于路侧安全领域广泛使用的有限元软件LS-DYNA,通过模拟和实车试验对比验证模型的有效性,建立货车与混凝土护栏复杂碰撞试验模型,模拟计算得到车辆碰撞护栏的详细动画,作为平曲线路段上护栏安全性能的直观感受,将行车道半径、路面超高、车辆速度作为变量,研究和量化主要线形指标对混凝土护栏安全性能的影响。结果表明:道路半径接近与设计速度对应的极限最小半径时,车辆的翻滚角增大,车辆易碰撞护栏发生侧翻;行车道路面超高6%为混凝土护栏安全性能的临界点,采用大于6%的超高会使车辆沿护栏迎撞面爬坡跃升的高度增加,车辆更容易发生侧翻,设计时应避免大超高(6%以上)和小半径极值的组合;在曲线路段,碰撞速度对护栏安全性能的影响明显,整体式货车车速达90 km/h后,发生侧翻的风险明显增加。文中研究成果可为道路曲线路段路侧的线形安全设计提供理论基础。

关键词: 道路工程, 公路线形指标, 混凝土护栏, 碰撞试验, 安全性能

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

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