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Abstract
This paper presents the development of a simplified model for predicting plate end (PE) debonding capacity of reinforced concrete (RC) beams flexurally strengthened using fiber reinforced polymers (FRP). The proposed model is based on the concrete shear strength of the beams considering main parameters known to affect the opening of the shear cracks and consequently affect PE debonding. The model considers also the effect of the location of the cut-off point of FRP plate along the span of the beam. The proposed model was verified against experimental database of 128 FRP-strengthened beams collected from previous studies that failed in PE debonding. In addition, the predictions of the proposed model were also compared with those of the existing PE debonding models. The predictions of the model were found to be comparable to the best predictions provided by the existing models, yet the proposed model is simpler. Furthermore, the proposed model was combined with the ACI 440 IC debonding equation to provide a procedure for predicting the governing debonding failure mode in FRP strengthened RC beams. The procedure was validated against 238 beam tests available in the literature, and shown to be a reliable approach.
Highlights
The use of fiber reinforced polymers (FRP) for strengthening reinforced concrete (RC) members has become popular in the engineering practice
The tensile strain developed in FRP reinforcement at the occurrence of any of such debonding failures represents a fraction of FRP ultimate tensile strain
The aim of this study is to develop a simplified model for predicting the plate end debonding in RC beams flexurally strengthened with FRP reinforcement
Summary
The use of fiber reinforced polymers (FRP) for strengthening reinforced concrete (RC) members has become popular in the engineering practice. In CCS failure, the normal tensile stresses are more critical than interfacial shear stresses The increase of these stresses leads to the formation of horizontal splitting cracks at the level of the tensile reinforcing steel bars and separation of the concrete cover. For strengthened beams with FRP terminated away from the support, CCS occurs after the formation of inclined cracks that develop at the plate end and propagate in the beam towards the tension steel bars. Debonding initiates at the end of the FRP plate when the interfacial stresses exceed the tensile strength of the concrete substrate The study is extended by combining the model with ACI 440.2R (ACI, 2017) IC debonding equation for predicting the governing debonding failure mode of FRP strengthened RC beams
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