Abstract
The objective of this paper is to experimentally study the shear behavior of reinforced concrete (RC) beams reinforced with glass fiber reinforced polymer (GFRP) stirrups. Six specimens including five RC beams reinforced with GFRP stirrups (GFRP-S-RC beams) and one beam strengthened with steel stirrups (RC beam) are fabricated. The effects of several parameters (i.e., stirrup type, the shear span ratio, and stirrup spacing) on the failure modes, shear crack width, shear capacity, strain variation of stirrup and longitudinal rebar, and the mid-span deflection are investigated. Similar to the conventional RC beam, three different types of shear failure modes including the shear compression failure, the diagonal compression failure, and the diagonal tension failure are observed on the GFRP-S-RC beams. The shear capacity of GFRP-S-RC beams decreases as the shear span ratio or stirrup spacing increases. GFRP stirrups exhibit a slight opposite effect on the shear capacity. The average and maximum strain of the stirrup both increase as the shear span ratio increases. The increase in the shear span ratio and the stirrup spacing adversely affects the ultimate deflection and longitudinal steel strain. A modified formula for the allowable strain of FRP stirrup is proposed. Considering the effect of uneven stress of stirrups, a model for predicting the shear capacity of GFRP-S-RC beams is proposed, and it shows good agreement with various test data.
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