摘要
基于有限元方法,采用经实车足尺碰撞试验验证的车辆和护栏模型,对某梁柱式型钢护栏进行安全性能评价。由于原设计护栏横梁迎撞面与立柱前翼板间距较小,且横梁在碰撞力方向刚度较弱,导致大客车与小客车碰撞护栏后,均在立柱处发生绊阻,且小客车车体重心处每10 ms平均加速度的最大值大于20g,不满足安全性能评价标准要求。在不大幅度增加材料用量、兼顾结构美观的前提下,对护栏结构进行优化,取消上下横梁嵌入立柱的设计形式;将上、中、下横梁统一为120 mm×160 mm的矩形管;下横梁厚度为3 mm,中、上横梁厚度为6 mm,立柱翼板厚度为10 mm。仿真分析结果表明,优化后护栏结构的防撞等级达到SA级(400 kJ),安全性能满足评价标准要求。
Based on finite element method, using the vehicle and barrier models verified by full-scale crash tests, the safety performance of a girder-and-post steel barrier was evaluated. Both bus and car were stumbled near the post after they impacted the original designed barrier due to the distance between barrier beam＇s impact surface and front flange of post was too small and the beam＇s stiffness in the direction of impact force was too weak. The maximum average acceleration of car＇s CG point per 10 ms was greater than 20g, which means that the original barrier could not meet the safety requirements of performance evaluation standard. Under the condition of no significant increase in material consumption and taken the appearance of the structure into account, the original barrier structure was optimized, the form of upper and lower beams embedded in the post was given up, the upper, middle and lower beams were unified to be rectangular tube of 120 mm × 160 mm, the thicknesses of lower beam, upper and middle beams, and flange of post were set to be 3 mm, 6 mm and 10 mm respectively. The simulation analysis result shows that the optimized barrier could achieve test level of SA （400 kJ）, which could meet the safety requirements of performance evaluation standard.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第1期139-144,共6页
Journal of Highway and Transportation Research and Development
基金
交通运输部西部交通建设科技项目(200731800003)
关键词
交通工程
护栏
有限元方法
安全性能评价
设计优化
traffic engineering
barrier
FEM
safety performance evaluation
design optimization
