TTI Research Supervisor:
Nauman Sheikh, P.E.
Assistant Research Engineer
Texas Transportation Institute
Texas A&M University System
College Station, Texas 77843-3135
(979) 845-8955 [email protected]
Pooled Fund Technical Representative:
Paul B. Fossier, Jr., P.E.
Assistant Bridge Design Administrator
Bridge and Structural Design Section
Louisiana Dept. of Transportation & Development
1201 Capitol Access Road
P.O. Box 94245
Baton Rouge, LA 79084-9245
(225) 379-1323 [email protected]
The primary motivation behind this project was to design a transition from a freestanding F-shape temporary concrete barrier to the pinned-down temporary concrete barrier developed by TTI. This first phase had the objective of determining if there is an equivalency between an anchoring pin installed in concrete pavement and a pin installed in some thickness of asphalt pavement. If such an equivalency could be established, the results of an ongoing project developing a transition design for placement on concrete can be used for placement on asphalt, without having to carry out additional analysis and testing on asphalt. This project was started as a first phase with the objective to perform quasi-static and dynamic pull tests to evaluate if such an equivalency in lateral resistance and deflection can be achieved between an anchoring pin installed in asphalt and concrete.
Results of the testing performed in this project enhanced understanding of the behavior of pins installed in asphalt. Useful insight was gained into the force-deflection response of the anchoring pins installed in both asphalt and concrete. The results of the testing however did not indicate an equivalency between the response of the pins installed in concrete and asphalt. Pins installed in asphalt had significantly reduced lateral restraint loads compared to concrete.
While the lateral restraint of the pin was somewhat sensitive to the thickness of the asphalt, the effect of the thickness was not significant enough to achieve the restraint level needed to match the performance of the pin in concrete. Consequently, a transition design for use on asphalt needs to be developed independently by performing more comprehensive analyses and full-scale crash testing.