TTI Research Supervisor:
Chiara Silvestri Dobrovolny, Ph.D.
Associate Research Scientist
Texas A&M Transportation Institute
College Station, Texas 77843-3135
(979) 845-8971 [email protected]
Pooled Fund Technical Representative:
Bridge Engineer Manager
Louisiana Department of Transportation and Development
1201 Capitol Road
P.O. Box 94245
Baton Rouge, LA 79084-9245
(225) 379-1933 [email protected]
Texas A&M Transportation Institute (TTI) recently developed a pinned-down F-shape temporary concrete barrier system that provides limited deflection and can be used on 4-inch thick asphalt pavement. In some applications, it is possible that a non-anchored free-standing barrier segment may be used with the anchored section. In this project, a transition system was designed and crash tested that allows smooth vehicle transition from the free-standing to the pinned-down anchored barrier system installed on asphalt..
The transition was developed to perform in accordance with American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH) test level 3 criteria, using the existing F-shape pinned concrete barrier design to the extent possible. The researchers developed a transition design concept and used full-scale finite element vehicular impact analysis to determine the critical impact point (CIP) of the transition design. The design was subsequently crash tested in accordance with MASH test 3-21 criteria (5000-lb vehicle, 62 mi/h, 25 degrees) at the critical impact point.
Results of the crash test were evaluated and it was determined the transition from the free-standing to anchored F-shape barrier placed on asphalt pavement performed acceptably for MASH Test Level 3.