Affiliation:
1. Midwest Roadside Safety Facility, 527 Nebraska Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0529.
Abstract
Long-span guardrail systems have been recognized as an effective means of shielding low-fill culverts. These designs are popular because, in comparison with other systems that attach posts to the top of the culvert, they are able to shield the culvert safely while creating little additional construction effort and limiting the damage to the culvert and the need for repair. However, previous long-span designs were limited by the need to use long sections of nested guardrail to prevent rail rupture and by the need for large lateral offsets between the barrier and the culvert. The Midwest Guardrail System (MGS) long-span design eliminates those two shortcomings by applying the benefits of the MGS to a long-span design. The MGS long-span design increased vehicle capture and stability because of the increased rail height, limited the potential for pocketing and wheel snag through the use of controlled-release terminal posts adjacent to the unsupported span, and greatly increased the tensile capacity of the rail through the movement of splices away from the posts and the use of shallower post embedment. These features allowed the system to be developed without the use of a nested guardrail and with a minimal barrier offset that placed the back of the guardrail posts even with the front face of the culvert. Two full-scale crash tests were conducted with the MGS long-span design according to the requirements in NCHRP Report 350 for Test Level 3 Test Designation 3-11. Both tests were conducted with the heavier 2,270-kg pickup truck to generate higher rail loads and dynamic deflections. The MGS long-span design met all safety requirements of NCHRP Report 350. The ability of the guardrail with the MGS long-span design to perform safely without a nested rail and a minimal barrier offset makes this new barrier a functional and safe option for the protection of low-fill culverts.
Subject
Mechanical Engineering,Civil and Structural Engineering
Cited by
9 articles.
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1. Dynamic response of piles embedded in granular soil to lateral impacts;Soil Dynamics and Earthquake Engineering;2024-05
2. Development and Evaluation of Top-Mounted Sockets for Weak-Post, Midwest Guardrail System on Culverts;Transportation Research Record: Journal of the Transportation Research Board;2022-05-07
3. Development of a Non-Gating Guardrail Terminal;Transportation Research Record: Journal of the Transportation Research Board;2021-06-03
4. Crash Testing and Evaluation of Culvert-Mounted Midwest Guardrail System;Transportation Research Record: Journal of the Transportation Research Board;2020-06-02
5. Standard Midwest Guardrail System Placed at 1V:2H Slope Break Point or with Omitted Post;Transportation Research Record: Journal of the Transportation Research Board;2017-01