Abstract
AbstractAs the number of heavy vehicles on the road continues to increase, collisions involving heavy vehicles and concrete median barriers (CMB) occur more frequently than in the past. Consequently, there is a growing need for research into more stringent design standards and improvements to the current CMB and their performance under harsh conditions. High-performance CMB is required to in order to withstand such conditions. This paper presents the results of numerical simulations and full-scale field tests to develop a high-performance CMB. To facilitate the development of the high-performance CMB, the concept of a deformable CMB was applied to the rigid CMB. A new apparatus called the shock absorber composed of dowel bars surrounded by empty space were introduced to make the rigid CMB deformable. In order to prevent local failure at the top of the barrier from a sudden high increase in impact energy, the deformable CMB was strengthened by adding reinforcements and widening the top based on the results of numerical simulations. The full-scale field tests were conducted on the proposed deformable CMB and took into account three appraisal areas: (1) structural adequacy, (2) occupant risk, and (3) vehicle trajectory after collision. The results of these tests showed that the deformable CMB contained and redirected the vehicle without allowing it to penetrate or override the deformable CMB. No detached elements, fragmentation, or other debris from the barrier were present. Therefore, the proposed high-performance CMB fulfilled all of the requirements of the crash test guideline.
Funder
National Research Foundation of Korea
Korea Expressway Corporation
Publisher
Springer Science and Business Media LLC
Subject
Ocean Engineering,Civil and Structural Engineering
Reference27 articles.
1. AASHTO. (2016). Manual for assessing safety hardware (MASH). In. Washington, DC: Association of State Highway and Transportation Officials.
2. Ahn, H. I., Kim, D. S., Moon, B. K., & Kim, K. D. (2021). Assessment of structural adequacy of semi-rigid safety barriers. International journal of crashworthiness, 1–14.
3. Auyeung, S., Alipour, A., & Saini, D. (2019). Performance-based design of bridge piers under vehicle collision. Engineering Structures, 191, 752–765.
4. Borovinšek, M., Vesenjak, M., Ulbin, M., & Ren, Z. (2007). Simulation of crash tests for high containment levels of road safety barriers. Engineering Failure Analysis, 14(8), 1711–1718.
5. CEB-FIP. (2012). FIB Model Code for Concrete Structures 2010. In (pp. 434). New Jersey, U.S.: Ernst & Sohn publishing house.