TY - JOUR
T1 - Development and Testing of a Test Level 4 Concrete Bridge Rail and Deck Overhang
AU - Rosenbaugh, Scott K.
AU - Rasmussen, Jennifer D.
AU - Faller, Ronald K.
N1 - Funding Information:
The authors wish to acknowledge several sources that made a contribution to this project: (1) the Midwest Pooled Fund and its member state DOTs for sponsoring the project and providing design guidance, and (2) MwRSF personnel, specifically Jeremiah Dixon, for constructing the test installation, conducting the crash tests, and performing all the calculations. The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The Midwest Pooled Fund and its member state DOTs sponsored the research as part of project TPF5-(193).
Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The Midwest Pooled Fund and its member state DOTs sponsored the research as part of project TPF5-(193).
Publisher Copyright:
© National Academy of Sciences: Transportation Research Board 2020.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - A Manual for Assessing Safety Hardware (MASH)-compliant Test Level 4 (TL-4) concrete bridge rail was optimized to satisfy MASH TL-4 design loads, maximize vehicle stability, minimize installation costs, and mitigate the potential for deck damage by minimizing loads transfer to the deck. Additionally, the bridge rail was designed with a 39 in. installation height so that it would remain crashworthy after future roadway overlays up to 3 in. thick. The barrier had a front face with a 3-degree slope from vertical to promote vehicle stability during impacts while also providing some slope to allow for slipforming installations. Yield line theory was utilized to design both interior and end regions of the barrier. Further, minimum deck strengths were determined and a deck overhang design procedure was provided for users desiring to modify their existing deck details. Finally, MASH Test 4-12 was conducted on the new bridge rail to evaluate its safety performance criteria, damage to the barrier and a critical deck configuration, and its working width. In test 4CBR-1, the 22,198 lb single-unit truck impacted the concrete bridge rail at a speed of 57.6 mph and an angle of 16 degrees. The single-unit truck was successfully contained and redirected, and all safety performance criteria were within acceptable limits as defined in MASH. Therefore, test 4CBR-1 was determined to be acceptable according to MASH Test 4-12. Conclusions and recommendations for implementation are provided.
AB - A Manual for Assessing Safety Hardware (MASH)-compliant Test Level 4 (TL-4) concrete bridge rail was optimized to satisfy MASH TL-4 design loads, maximize vehicle stability, minimize installation costs, and mitigate the potential for deck damage by minimizing loads transfer to the deck. Additionally, the bridge rail was designed with a 39 in. installation height so that it would remain crashworthy after future roadway overlays up to 3 in. thick. The barrier had a front face with a 3-degree slope from vertical to promote vehicle stability during impacts while also providing some slope to allow for slipforming installations. Yield line theory was utilized to design both interior and end regions of the barrier. Further, minimum deck strengths were determined and a deck overhang design procedure was provided for users desiring to modify their existing deck details. Finally, MASH Test 4-12 was conducted on the new bridge rail to evaluate its safety performance criteria, damage to the barrier and a critical deck configuration, and its working width. In test 4CBR-1, the 22,198 lb single-unit truck impacted the concrete bridge rail at a speed of 57.6 mph and an angle of 16 degrees. The single-unit truck was successfully contained and redirected, and all safety performance criteria were within acceptable limits as defined in MASH. Therefore, test 4CBR-1 was determined to be acceptable according to MASH Test 4-12. Conclusions and recommendations for implementation are provided.
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U2 - 10.1177/0361198120924406
DO - 10.1177/0361198120924406
M3 - Article
AN - SCOPUS:85094884333
VL - 2674
SP - 455
EP - 465
JO - Transportation Research Record
JF - Transportation Research Record
SN - 0361-1981
IS - 8
ER -