United States Department of Transportation
i
MASH TL-4 Engineering Analyses and Detailing of 36-In. And 42-In. High Median Barriers for LADOTD
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2023-07-01
[PDF-33.15 MB]
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Edition:August 1, 2022–January 31, 2023
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Abstract:Single-slope median barriers are currently planned for several bridges in Louisiana. For these bridges, both 36-in. and 42-in. designs were developed and considered as part of this project. Both barrier designs can be used near a longitudinal joint that is approximately 1 in. wide. The 36-in. high barrier is similar to the single-slope traffic rail (SSTR) used by the Texas Department of Transportation (TxDOT), which was successfully crash tested according to the Manual for Assessing Safety Hardware (MASH) Test Level 4 (TL-4) in July 2010. The Louisiana Department of Transportation and Development has incorporated the TxDOT SSTR bridge rail height and profile for the median barriers planned for this project. The 42-in. high barrier maintains the same slope as the 36-in. median barrier but has a smaller top thickness. This project aimed to evaluate the strength of the proposed median barrier designs according to the American Association of State Highways and Transportation Officials Load and Resistance Factor Design (LRFD) Bridge Design Specifications for MASH TL-4 crash performance. The report presents the results of the strength analyses performed on these designs and offers recommendations for improving their strength and performance under MASH TL-4 impact conditions.
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