United States Department of Transportation
i
MASH test 3-21 on TL-3 thrie beam transition without curb.
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2013-01-01
[PDF-8.69 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-SAFETY AND SECURITY-Highway Safety;
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Abstract:This project evaluated the impact performance of a modified TxDOT thrie beam transition to rigid
concrete barrier without a curb element below the transition rail. In a previous test described in TxDOT
Research Report 0-4564, a thrie beam transition without curb failed to meet NCHRP Report 350 performance
criteria. However, it could not be discerned whether the vehicle instability observed in that test was
attributable to the missing curb or the rotation of the thrie beam transition rail into the sloped face of the
concrete safety shape rail at the bridge end connection point.
A transition design without curb would reduce the complexity of the field installations and would
provide an option for dealing with different drainage requirements at bridge ends. A fabricated steel
blockout was incorporated into the transition system to keep the thrie beam rail and terminal connector in a
vertical plane at its connection to the concrete bridge rail.
The modified thrie beam transition without curb failed to meet MASH TL-3 requirements due to
rollover of the impacting vehicle. Further discussions as to the possible cause of the failure are described
within the report.
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