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Shear Strengthening of RC Beams Using GFRP Vertical Strips — An Experimental Study

The uses of composite materials for the strengthening of shear deficient concrete structures are limited. The research in this area has been taking place since 1991. Study in this field aims at understanding the various reinforcement configurations of sheets that can be used for shear strengthening and also the different failure modes a strengthened beam undergoes at the ultimate state. Furthermore, the experimental data bank for shear strengthening of concrete beams, using FRP, remains relatively sparse due to which the design algorithms for computing the shear contribution of FRP are not yet clear. The objective of this study is to clarify the role of GFRP strips, epoxy bonded to the beam web for shear strengthening of RC beams. Included in the study are effectiveness in terms of width and spacing of vertical GFRP strips, spacing of internal steel stirrups, and longitudinal steel rebar section on shear capacity of the RC beam. The study also aims to understand the shear contribution of concrete, shear strength due to steel bars and steel stirrups, and the additional shear capacity due to glass fiber reinforced polymer strips in a RC beam.