Safety evaluation of W-beam guardrail on freeway(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年06期
- Page:
- 92-98
- Research Field:
- 交通工程
- Publishing date:
Info
- Title:
- Safety evaluation of W-beam guardrail on freeway
- Author(s):
- CHEN Tao; WU Ling-sheng; TIAN Dong-xiang; WEI Lang
- 1. Key Laboratory of Automobile Transportation Safety Techniques of Ministry of Transport, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Sichuan Expressway Construction Development Corporation, Chengdu 610000, Sichuan, China
- Keywords:
- traffic engineering; W-beam guardrail; crash simulation; safety performance; reconstruction program
- PACS:
- U417.12
- DOI:
- -
- Abstract:
- In order to achieve rapid evaluation of guardrail safety in Chinese freeway reconstruction and expansion projects to meet the revised design requirements of traffic safety facilities standards, research on the W-beam guardrail collision safety evaluation was carried out. Finite element models with plate thickness of 4 mm for the new standard W-beam guardrail and the plate thickness of 3 mm for the old standard W-beam guardrail, the constraint model of soil and column, and the integrated finite element model of Chevrolet C2500 were established. Contact area in the collision of vehicle body and guardrail was locally refined by grid. The accuracy of finite element models for vehicle-road-guardrail was verified by real vehicle test. The difference of design standard for different guardrails was analyzed, and the improvement program of adding middle column for the old standard guardrail with plate thickness of 3 mm was put forward. According to the evaluation specification for highway safety barriers (JTG/T F83-01—2004), the crash simulation test was conducted. The parameters of finite element simulation of the guardrail maximum deformation, accelerations of vehicle body centre of mass, the degree of vehicle driving-out were then acquired. The safety performance of the old and the new standard guardrail and revised guardrail was compared, and the feasibility of the improvement program was evaluated. The results show that the relative error of the maximum dynamic deformation is 2.8%, and the error of degree of vehicle driving-out is 1° by comparing simulation test and real vehicle test, which proves the accuracy of the established finite element model of vehicle and guardrail. The deformation of improved guardrail model after collision is 436 mm, the three-axis accelerations of vehicle body centre of mass are less than 20g, and the degree of vehicle driving-out is less than 12°, which are all within the standard range. Therefore, the improved design of guardrail is feasible. The three-dimensional nonlinear finite element simulation method can rapidly evaluate the safety performance of W-beam guardrail and improve the design efficiency of freeway safety facilities.
Last Update: 2017-12-18