United States Department of Transportation
i
Evaluating FRP Repair Method for Cracked Prestressed Concrete Bridge Members Subjected to Repeated Loadings (Phase 1): Summary
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2005-04-01
[PDF-63.83 KB]
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Abstract:Static tests to failure were run on three of the specimens to determine the effect of strengthening on the improvement of strength and stiffness. Fatigue tests were run on two of the specimens to determine the degradation of strength and stiffness under repeated load cycles. Static tests to failure were performed on both ends of each specimen. In one test setup, shear cracks were allowed to develop near the girder end, within the prestress force transfer zone causing a bond-slip failure to occur. In the other setup, the shear cracks were allowed to develop away from the prestress transfer zone causing a shear failure to occur. The ability of the CFRP to strengthen the specimens against both failure modes was examined. The analytical results were correlated with experimental results to determine model accuracy. An accurate model will prove useful for KDOT in future design and analysis of FRP strengthened prestressed and reinforced concrete beams.
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