United States Department of Transportation
i
Evaluation of repair techniques for impact-damaged prestressed beams : final report.
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2017-04-01
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[PDF-3.71 MB]
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Edition:Final report
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Abstract:Collisions between over height vehicles and bridges occur about 1,000 times per year in the United States. Collision damage to
bridges can range from minor to catastrophic, potentially requiring repair or replacement of a bridge beam. For prestressed concrete
beams, the traditional repair methods are strand splices and Fiber-Reinforced Polymer (FRP) wraps. A new material, Fabric
Reinforced Cementitious Matrix (FRCM), has been developed as an alternative to traditional FRP wrap.
The first objective of this project was to damage, repair and test four beams retrieved during the demolition of the overpass of
Arcadia Road over Interstate 81 at Arcadia, VA. The repair techniques evaluated were strand splices, FRP, FRCM and a
combination of FRCM and strand splices. The beams were tested in the lab in simple span configuration with the repair location
placed in a region of constant moment. Loads were applied monotonically to failure. One beam was tested in an undamaged
condition as a control.
Several methods were used to calculate strength and behavior. Simple methods from AASHTO and ACI were used for hand
calculations of flexural strength. Conventional strain compatibility was also used. Non-linear beam models and non-linear three
dimensional finite element models were also investigated as tools to evaluate repaired beams. Material characterization was
performed on the concrete, prestressing steel, splice chucks, FRP and FRCM. The material characterization was used to develop the
material models for the analyses.
It was found that the greatest percentage of original strength was returned by the FRP repair and the repair with the combination of
FRCM and splice chucks. The lowest percent was returned with only splice chucks when eight of 48 strands were severed and
spliced. The FRCM proved to be a viable repair technique, but should be tested in fatigue before deployment on a bridge with high
truck traffic. The analysis methods were shown to provide good estimates of strength and load-deflection behavior.
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