Abstract
AbstractThis paper presents the results of an analytical study on reinforced concrete (RC) T-beams strengthened in shear with L-shaped fiber-reinforced polymer (FRP) plates. The main objective of this study is to develop design equations for RC beams retrofitted in shear using L-shaped FRP plates, considering all possible modes of failure in ultimate limit states. Unlike RC beams strengthened with externally bonded (EB) FRP plates and fabrics, prefabricated L-shaped plates feature unconventional failure modes because of their special shape and anchorage. The possible failure modes for RC beams strengthened with L-shaped FRP plates are (1) concrete breakout at the embedded part of the FRP plate in the flange; (2) FRP pull-off at the epoxy/FRP interface; (3) FRP pull-off at the concrete/epoxy interface; and (4) FRP overlap failure at the beam soffit. These failure modes do not occur in RC beams shear-strengthened with EB FRP fabrics and plates. Therefore, the existing design models for EB FRP fabrics and pl...
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