Abstract
This research focus on the contribution of Glass Fiber Reinforced Polymer (GFRP) reinforcement to the shear transfer mechanism in concrete interfaces conducting push-off tests on 27 specimens to observe its impact on interface shear strength. Results showed that GFRP reinforcement significantly improves shear strength and prevents sudden failure by allowing deformation upon reaching ultimate capacity.
A mathematical model, developed from these experimental findings and additional data, employs multiple linear-regression analysis to introduce new parameters for a more accurate representation of GFRP behavior in shear transfer. It highlights the inadequacy of current design provisions, like those in AASHTO GFRP (2018), to account for GFRP's behavior, suggesting a focus on reinforcement stiffness in tension.
Furthermore, the development and publication of new technical standards, along with the improvement of the existing ones, are essential for ensuring quality control, validation, and acceptance of this emerging technology. A key aspect of these improvements is the evaluation of precision statements in various ASTM standards related to the physical-mechanical and durability characterization of GFRP bars used as internal concrete reinforcement.