Shear Capacity Model with Variable Orientation of Concrete Stress Field for RC Beams Strengthened by FRP with Different Inclinations

Influence of Cross-Section Shape and FRP Reinforcement Layout on Shear Capacity of Strengthened RC Beams

“…Three different models-ACI 440.2R-17 [18], CNR-DT-200/R1 [21] and Colajanni et al [19]-are reported and discussed below. The code models are reported hereinafter as presented in their original form.…”

“…Colajanni et al [19] analyzed a large database comparing the experimental shear and the analytically calculated shear strength of different models. It was found that the angle of inclination of the FRP has a significant effect on the shear strength of RC beams.…”

“…In the light of the foregoing discussion, three main models for an RC shear critical beam strengthened with FRP are considered in this research: the model of Colajanni et al [19], ACI 440.2R-17 [18] and CNR-DT-200/R1 [21]. Each model is analyzed with six different formulations that incorporate the effective FRP strain (R factor).…”

“…Each model is analyzed with six different formulations that incorporate the effective FRP strain (R factor). Two of the approaches, namely (1: Nanni (2000, 2002), Pellegrino Modena (2006), and 2: Chen and Teng (2003)) [7,[22][23][24][25] are adopted in the Colajanni et al model, which also considers the reduction factor for steel stirrups [19].…”

“…To this aim, a large database was collected, considering rectangular and T sections, with vertical and inclined FRP, also including specimens characterized by mechanical anchorages between FRP and the RC beam. The experimental values were compared with the shear-strength values obtained from the three above-mentioned models [18,19,21]. The results are discussed focusing on the influence of the cross-section shape and the FRP angle of inclination on both the shear strength of the specimen and the reliability of the shear models, also considering the effect of the various effectiveness-factor models for FRP.…”