The thrie-beam bullnose system is a non-gating, redirective crash cushion that provides a safe, cost effective, non-proprietary option for shielding median piers and other median hazards. It consists of a guardrail envelope comprised of thrie-beam panels mounted at a height of 803 mm and supported by breakaway steel posts. The nose rail section and the first two adjacent rail sections are radiused and slotted, and the fourth and fifth rail sections are slotted. The combination of the radiused and slotted rail segments along with the breakaway posts allow the system to safely capture and decelerate vehicles impacting near the end or nose of the system, while redirecting vehicles impacting along the side. The barrier system was originally developed and evaluated under National Cooperative Highway Research Program (NCHRP) Report 350.
In 2009, the American Association of State Highway and Transportation Officials (AASHTO) implemented an updated standard for the evaluation of roadside hardware. The new standard, the Manual for Assessing Safety Hardware (MASH), improved the criteria for evaluating roadside hardware beyond the previous NCHRP Report 350 standard through updates to test vehicles, test matrices, and impact conditions. A research effort was undertaken to evaluate the thrie-beam bullnose to MASH Test Level 3 through full-scale crash testing and modify the design as needed to meet the revised safety criteria. This paper details the evaluation of the thrie-beam bullnose through MASH TL-3 full-scale crash tests, modification of the original design to meet MASH criteria, and recommendations for implementation of the system.
MASH TL-3 Development and Evaluation of the Thrie-Beam Bullnose Attenuator
Sustain. Civil Infrastruct.
International Road Federation World Meeting & Exhibition ; 2021 ; Dubai, United Arab Emirates November 07, 2021 - November 10, 2021
21.04.2022
17 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Highway safety , Crash test , Roadside appurtenances , Breakaway posts , Compliance test , MASH 2016 , Bullnose , Thrie beam Engineering , Transportation Technology and Traffic Engineering , Sustainable Development , Building Construction and Design , Building Materials , Earth and Environmental Science
Transportation Research Record | 2023
|Safety Performance Evaluation of Modified Thrie-Beam Guardrail
Springer Verlag | 2022
|Triple T: Truck Thrie Beam Transition
Online Contents | 1995
|Midwest Guardrail System W-Beam-to-Thrie-Beam Transition
Transportation Research Record | 2007
|