Strengthening of shear critical RC beams with various FRP systems

•Shear strengthening methods including CFRP wraps, GFRP wraps and FRCM wraps are compared.•Effectiveness of commercially produced FRP anchors to prevent debonding are evaluated.•Guidelines for installation procedure for FRP anchors are provided.•Experimental results are compared to analytical predic...

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Bibliographic Details
Published in:Construction & building materials 2014-09, Vol.66, p.634-644
Main Authors: Baggio, Daniel, Soudki, Khaled, Noël, Martin
Format: Article
Language:English
Subjects:
Analysis
Carbon fiber
Composite
Concrete
Fiber reinforced cementitious matrix
FRP
Glass fiber
Mechanical properties
Reinforced concrete
Reinforced plastics
Repair
Shear
Strengthening
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Summary:•Shear strengthening methods including CFRP wraps, GFRP wraps and FRCM wraps are compared.•Effectiveness of commercially produced FRP anchors to prevent debonding are evaluated.•Guidelines for installation procedure for FRP anchors are provided.•Experimental results are compared to analytical predictions using current code equations. The use of fiber reinforced polymer (FRP) sheets to shear strengthen reinforced concrete (RC) beams has been studied and proven repeatedly. However, numerous strengthening configurations and materials can be combined to maximize the increase in strength and repair. This study investigates the effectiveness of using commercially manufactured carbon FRP (CFRP), glass FRP (GFRP) and fiber reinforced cementitious matrix (FRCM) sheets to increase the shear capacity of RC shear critical beams. Nine RC shear deficient slender beams were tested. The test variables included the use of three different FRPs (CFRP, GFRP, and FRCM), and the presence and type of FRP anchors (CFRP or GFRP). The experimental results revealed that applying FRP sheets increased the overall shear capacity, full depth u-wrapped FRP sheets perform better over companion partial depth u-wrapped FRP sheets, the use of FRP anchors further improved the shear capacity and ductility of failure, FRP strengthening could change the mode of failure from a shear to flexural failure and FRP debonding was delayed with the presence of FRP anchors. A comparison of the experimental load capacities with predicted values indicates that they correlate well with predictions using the current Canadian design codes.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2014.05.097