United States Department of Transportation
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Alternative Title:End region detailing of pretensioned concrete bridge girders, appendix C : SR-72 tests.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
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Abstract:The Florida highway system includes some of the earliest (circa 1950s) pretensioned
concrete bridges in the United States. Shear capacity of Florida’s early pretensioned girders is of
interest because the early designs had thin webs and only limited vertical reinforcement. This
report presents the results of load testing conducted on early girders that were removed from an
existing bridge (Figure 1) after nearly 55 years of service. In total, six girders were removed and
tested. Girders were loaded in three-point bending at a/d ratios ranging from 2.1 to 4.5. Results
of load testing will assist engineers in determining the strength of similar existing girders.
In addition to evaluating shear capacity of early pretensioned girders, this project also had
the goal of evaluating the contribution to the shear capacity from the cast-in-place concrete
bridge decks. To this end, varying portions of the deck and curb were retained with each
salvaged test girder. Width of the retained deck portions ranged from 2 ft to 7 ft. Two of the
girders were exterior girders and were removed with the curb portion of the bridge deck intact.
The exterior girders allowed the strength and stiffness contributions of the curb to be evaluated.
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