Value Engineering and Cost Effectiveness of Various Fiber Reinforced Polymer (FRP) Repair Systems [2005]

US Transportation Collection2005PDFTech ReportRizkalla, SamiRosenboom, OwenMiller, AnthonyNorth Carolina State University. Department of Civil EngineeringUnited States. Federal Highway AdministrationNorth Carolina. Dept. of Transportation. Research and Analysis GroupNorth CarolinaPrestressed concrete bridgesGirdersFiber reinforced materialsRepairingStrengthening (Maintenance)Value engineeringCost effectivenessPrestressed concrete bridges--Maintenance and repairGirdersPrestressed concreteFiber-reinforced plasticsFHWA/NC/2006-27Final report; 7/1/2003-6/30/2005.Seventeen 40 year old C-Channel type prestressed concrete bridge girders and one impact damaged AASHTO Type II prestressed concrete girder were tested under static and fatigue loading to determine the cost-effectiveness and value engineering aspects of various Fiber Reinforced Polymer (FRP) repair and strengthening systems. Of the C-Channel girders, which were taken from two different 40 year old bridges in Eastern North Carolina, three were tested as control girders (one statically loaded to failure, and two tested under fatigue loading) and fourteen tested with various Carbon FRP strengthening systems (eight statically loaded to failure and six tested under fatigue loading). The fatigue loading applied to the strengthened C-Channel girders was chosen to simulate a specified increase in live load value in comparison to the control girders.An AASHTO Type II prestressed concrete bridge girder was taken from a bridge near Fayetteville, NC which was struck by an overheight vehicle. The girder had significant damage to the concrete and one ruptured prestressing strand near midspan. The concrete section was restored and the girder was repaired with Carbon FRP. The repaired AASHTO girder survived 2 million cycles of loading designed to simulate the original service load of the girder with little degradation. The ultimate load observed during a test to failure was 13.3 percent higher than the predicted value of the original girder.The experimental program and analysis of the test results demonstrate that FRP systems can effectively strengthen deficient prestressed concrete members and/or repair damaged prestressed girders.96