Experimental and Analytical Study of Bond Stress–Slip Behavior at the CFRP-to-Concrete Interface

Fathi, Abbas; El-Saikaly, Georges; Chaallal, Omar

doi:10.1061/jccof2.cceng-4074

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…Zomorodian et al performed experimental research on the method of shear reinforcement for side-bonding CFRP. The failure of the reinforced beams often results from CFRP debonding, which typically leads to a limitation in the beams' ductility [10,11], and the enhancement in the shear performance is quite minimal [12]. Chen et al investigated the U-wrap CFRP technique [9,13,14] and found that the bond length of the CFRP in this technique was constrained by the crosssectional dimensions of the concrete structure [15,16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Performance of Concrete Beams Reinforced with Externally Unbonded Prestressed CFRP Tendons

Qi,

Jiang,

Wang

et al. 2024

Fibers

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To investigate the reinforcing effect of externally prestressed carbon-fiber-reinforced polymer (CFRP) tendons on the shear performance of reinforced concrete beams, a set of model tests was designed. Static load comparative tests were conducted on one original beam and four reinforced beams to experimentally investigate the impacts of the prestress level and damage in the shear zone on the shear reinforcement effect and analyze the reinforcement mechanism of CFRP tendons. The results show that in the beams reinforced with CFRP, the CFRP tendons could work collaboratively with the stirrups to reduce the strain on the stirrups; the increasing rate in the yield load was 28–70%. After the stirrups yielded, the CFRP tendons did not yet reach their ultimate tensile strength and could still withstand increased shear forces, resulting in an increasing rate of the ultimate load for the reinforced beams with a CFRP content of 56–78%. The enhancements in both the yield load and the ultimate load were positively correlated with the level of prestress in the CFRP tendons. This reinforcement technique efficiently restricts the growth and delays the first appearance of diagonal cracks. The prestress can close the pre-existing diagonal cracks and provide a reserve of shear capacity for the beams. The initial damage in the shear zone decreases the initial shear stiffness and increases the width of the initial diagonal cracks. However, this effect gradually diminishes as the load increases and does not significantly impact the shear capacity. Prestressing can significantly improve the strength utilization rate of the CFRP reinforcement when the reinforced beams fail. The deformation of the CFRP tendon is directly related to the shear deformation. By combining this relationship with the truss–arch model, the shear capacity for the reinforced beam can be predicted. The predicted results exhibit an error of less than 10% when compared to the test results, offering valuable design guidance for reinforced engineering composites.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Performance of Concrete Beams Reinforced with Externally Unbonded Prestressed CFRP Tendons

Qi,

Jiang,

Wang

et al. 2024

Fibers

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“…24 Collectively, a number of parameters can affect the failure mode of FRP-strengthened RC beams, such as concrete strength, FRP bond length, FRP axial stiffness, FRP-to-concrete width ratio, resin bond strength and bond stiffness. 25–30…”

Section: Introductionmentioning

confidence: 99%

“…24 Collectively, a number of parameters can affect the failure mode of FRP-strengthened RC beams, such as concrete strength, FRP bond length, FRP axial stiffness, FRP-toconcrete width ratio, resin bond strength and bond stiffness. [25][26][27][28][29][30] Numerically, the bond behaviour between the FRP and the concrete substrate can be simulated by two methods. In the first, the interface between the FRP region and the concrete substrate is modelled as a perfect bond (no slip is allowed between the concrete region and the composite materials).…”

Section: Introductionmentioning

confidence: 99%

Development of a local bond shear stress-slip model of RC beams externally strengthened with FRP materials

Bouziadi

Haddi

Tahenni

et al. 2023

Journal of Composite Materials

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This paper presents an analysis of the numerical investigation of RC beams, strengthened with CFRP and tested in flexure, using the ANSYS© numerical analysis code. In the first part of this paper, finite-element models of RC beams (control and CFRP-strengthened), subjected to four-point bending, are developed based on experimental tests as reported in the literature. Then, a 3D nonlinear finite-element analysis (NLFEAs) with perfect bonding, along with 12 cohesive zone material (CZM) models proposed by researchers in literature, are explored to simulate the behaviour of CFRP-strengthened RC beams. In the second part of this work, the compressive strength of the concrete and the elastic modulus of the epoxy resin are examined to study their effect on the same CFRP-strengthened RC beam. On the basis of those two studies, a bilinear CZM model is modified to predict the behaviour of RC beams strengthened with FRP materials, and interfacial shear debonding phenomena. The modified CZM model is verified against a database of experimental results that includes 23 RC beams, strengthened with FRP tested in flexure, with different concrete compressive strength, FRP modulus of elasticity and resin elastic modulus. The experimental and predicted ultimate loads are compared to verify the accuracy of the modified CZM model. The level of fitness between the modified CZM model and experimental results is elaborated with statistical metrics such as integral of the absolute error (IAE), root mean square error (RMSE) and coefficient of determination (R2). The results show good agreement between the experimental and predicted ultimate loads.

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Fatigue Behavior in the Carbon-Fiber-Reinforced Polymer-to-Concrete Bond by Cyclic Pull-Out Test: Experimental and Analytical Study

2023

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Experimental and Analytical Study of Bond Stress–Slip Behavior at the CFRP-to-Concrete Interface

Cited by 4 publications

References 31 publications

Experimental Study on Shear Performance of Concrete Beams Reinforced with Externally Unbonded Prestressed CFRP Tendons

Experimental Study on Shear Performance of Concrete Beams Reinforced with Externally Unbonded Prestressed CFRP Tendons

Development of a local bond shear stress-slip model of RC beams externally strengthened with FRP materials

Fatigue Behavior in the Carbon-Fiber-Reinforced Polymer-to-Concrete Bond by Cyclic Pull-Out Test: Experimental and Analytical Study

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