Bridge-in-a-Backpack(TM). Task 7 : investigation of damage and repairs for concrete filled FRP tubular arches.
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Bridge-in-a-Backpack(TM). Task 7 : investigation of damage and repairs for concrete filled FRP tubular arches.

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      This report includes fulfillment of Task 7 of a multi-task contract to further enhance concrete filled FRP tubes, or the Bridge in a Backpack. Damage due to impact of the FRP shell of the concrete filled FRP tubular arch bridges has been and still is a concern for many engineers and administrators. This technology uses the exterior FRP shell for confinement, protection and longitudinal reinforcement of the reinforced concrete arch member. This report was commissioned to look at types of potential damage to these members, effects of varying levels of damage on flexural capacity and methods of repair to damaged sections. The 3-point bending strength of reinforced hybrid concrete beams was reduced by 36-47% by the presence of notches with widths between 0.5 and 2.8 inches. Measured percent reduction in bending capacity did not correlate well with measured notch size or predicted values using traditional methods of section loss. Reinforced hybrid concrete beams, broken and repaired by one particular method with triaxial broadgood, exhibited only 17-18% of their original strength. A hybrid concrete arch, tested to failure in 2009 at about 62,300 lb, was repaired by Kenway Corporation in March 2014 by generally following the guidance of Duong and Wang (2007). The resulting repair patch failed after 1.5 inches displacement at 43,041 lb (69%), after which the arch sustained an additional 6.0 inches of displacement until its shoulder ruptured at 60,321 lb.
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