Shear Design Equations for EB FRP-RC Beams Based on Data Fitting Approach

Abstract

Based on a data fitting method applied to 490 experimental test data that are publicly available in the literature, this study provides simplistic and straightforward equations to determine the shear capacity of FRP bonded-RC beams. Complete wrap, U-wrap, and side wrap schemes pertaining to Carbon Fiber Reinforced Polymer (CFRP) were analyzed separately. Current design codes follow a customary approach where the nominal shear capacity is calculated by simply accumulating the shear contribution of concrete, transverse reinforcement, and FRP. The interaction between concrete, transverse reinforcement, and FRP is usually not taken into consideration. While the modulus of elasticity of FRP, longitudinal steel ratio, transverse steel ratio, and FRP ratio all have an inverse interaction with the effective strain of FRP, the concrete's compressive strength is positively linked with the effective FRP strain, i.e., when the concrete compressive strength increases, effective FRP increases. This investigation further showed that as transverse and longitudinal reinforcement are increased, the influence of FRP on shear contribution decreases. ACI 440.2R-17 and, CSA S806-02 are among the regularly used shear design methodologies in North America and they were used to compare the performance of the proposed equations. The obtained results show that the proposed equations predict the experimental results more accurately than ACI 440.2R-17 and CSA S806-02.