斜坡中央分隔带车辆撞击下的缆索护栏数值建模与仿真

IF 2.1 Q2 ENGINEERING, CIVIL
Qian Wang, Emre Palta, H. Fang
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引用次数: 0

摘要

缆索护栏是一种柔性护栏系统,因其普遍有效、安装和维护成本低,在美国通常被用作中间护栏。北卡罗来纳州交通部目前采用的缆索中央分隔带(CMB)曾在平坦地形上进行过评估,结果表明该系统符合国家合作公路研究计划第 350 号报告的要求。在使用条件下(即在倾斜的中央分隔带),目前的 CMB 在许多事故中都无法阻止小型客车。新的道路安全标准《安全硬件评估手册》(MASH)建议在倾斜的中间分隔带上对中巴进行测试和/或评估。然而,在倾斜的中央分隔带上进行全面的碰撞测试非常困难,而且实验研究也很少。在本研究中,我们使用有限元模拟来评估目前的中巴设计在 MASH 测试 3 级条件下在 6H:1V 倾斜中线上的性能。为了解决目前中巴上的车辆底线问题,研究人员开发了两种改装设计,并在倾斜的中线上进行了评估。两辆符合 MASH 标准的车辆(1996 年道奇霓虹和 2006 年福特 F250)分别从正面和背面以及两个初始撞击点对所有三个中巴进行了评估。使用 MASH 出口箱标准、MASH 评估标准 A、D 和 F、车辆响应、出口角和残余速度来评估中巴的结构适当性、乘员风险和撞击后轨迹。模拟结果表明,在 MASH 测试 3 级条件下,其中一种改造设计可改善倾斜中线上的中巴性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical modeling and simulation of cable barriers under vehicular impacts on a sloped median
Cable barriers are flexible barrier systems that are commonly used as median barriers in the United States for their general effectiveness and low installation and maintenance costs. The current cable median barrier (CMB) adopted by the North Carolina Department of Transportation was previously evaluated on flat terrain and found to satisfy the requirements of the National Cooperative Highway Research Program Report 350. Under in-service conditions (i.e., on a sloped median), the current CMB failed to stop small passenger cars in many incidents. The new roadside safety standard, Manual for Assessing Safety Hardware (MASH), recommends that CMBs be tested and/or evaluated on sloped medians. However, conducting full-scale crash tests on sloped median is extremely difficult and few experimental studies exist. In this study, finite element simulations were used to evaluate the performance of the current CMB design on a 6H:1V sloped median under MASH Test Level 3 conditions. To address the issue of vehicle underriding on the current CMB, two retrofit designs were developed and also evaluated on the sloped median. Two MASH compliant vehicles, a 1996 Dodge Neon and a 2006 Ford F250, were used to evaluate all three CMBs from both frontside and backside and with two initial impact points. The MASH exit-box criterion, MASH Evaluation criteria A, D, and F, vehicular responses, exit angles, and residual velocities were used to evaluate the CMB performance for structural adequacy, occupant risk, and post-impact trajectories. The simulation results showed that one of the retrofit designs could improve the CMB performance on a sloped median at MASH Test Level 3 conditions.
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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