Evaluation of Shear Capacity of FRP-Reinforced Concrete Beams
Existing methods for calculation of shear capacity of concrete beams reinforced with fiber-reinforced polymer (FRP) are generally based on slightly modified versions of well established semi-empirical shear design equations. These equations were primarily derived from experimental data generated on concrete beams having steel reinforcement. However, FRP materials have different mechanical properties and consequently exhibit different modes of failure than steel, making the extension of existing shear design equations for steel-reinforced concrete (S-RC) beams to cover concrete beams reinforced with FRP somehow inaccurate. Current available methods include ACI 440-06, JSCE-97, CSA S806-02, and ISIS Canada-01. Availability of FRP reinforcement products varies in terms of capacity and modulus of elasticity, which can result in a significant change in behavior. An experimental database of 150 FRP-reinforced concrete (FRP-RC) beams was collected from published literature. Subsequently, this database was used to assess the validity of these four main existing shear design methods for FRP-RC beams. This study investigates the performance of the abovementioned design methods to estimate the nominal shear capacity, Vn of steel-free concrete beams reinforced with FRP bars. Results show that current design guidelines provide a shear strength underestimation in the case of beams without shear reinforcement and a shear strength overestimation for beams with shear reinforcement.
Civil and Environmental Engineering | Construction Engineering and Management | Structural Engineering
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El Chabib, H.,
Evaluation of Shear Capacity of FRP-Reinforced Concrete Beams.
Proceedings of the 5th Middle East Symposium on Structural Composites for Infrastructure Applications