An empirical FRP-concrete bond-slip model for externally-bonded reinforcement on grooves

Moghaddas, Amirreza; Mostofinejad, Davood; Saljoughian, Alireza; Ilia, Elaheh

doi:10.1016/j.conbuildmat.2021.122575

Cited by 34 publications

(6 citation statements)

References 40 publications

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“…EBROG can be considered as a modification of the EBR technique. Moghaddas et al [ 54 ] compared the behavior of EBR and EBROG in beams and found that the EBROG specimens presented enhancements of 18–68% in their bond strength compared to the EBR specimens. Consequently, the slip for the maximum on-groove shear stress increased by approximately 50% compared with that recorded for the EBR specimens [ 55 ].…”

Section: Research Progressmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Studies and Application of Fiber-Reinforced Polymers (FRPs) in Civil Infrastructure Systems: A State-of-the-Art Review

Albuja-Sánchez,

Damián-Chalán,

Escobar

2024

Polymers

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The application of FRPs in civil infrastructure has increased, particularly in the last 20 years. FRPs have gained importance because of their resistance to harsh environments, high strength-to-weight ratio, and good corrosion resistance, and they are faster and easier to apply than other traditional methods. The rehabilitation of structures is the main area in which FRPs have been developed, because they have allowed for compliance with architectural restraints in historic structures. This review is a compilation of the research conducted on the laboratory and field applications of FRPs, highlighting the different applied methods, installation difficulties, and failure modes of FRPs. Moreover, this review compares studies on the types of fibers such as CFRPs, GFRPs, and AFRPs, and their effects would affect the mechanical properties of civil infrastructure and the durability characteristics of civil infrastructure in challenging environmental conditions. In addition, this review focuses on the modification of the mechanical properties of structural elements using different methods of installing FRPs, including externally bonded reinforcement (EBR), and their main problem: debonding failure before the ultimate load.

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Section: Research Progressmentioning

confidence: 99%

“…Zamani et al [ 57 , 58 ] demonstrated that grooving methods are superior to the EBR method in terms of bonding [ 54 ]. EBRIG with one layer of FRP achieved a maximum load 82% and 41% higher than the EBR and EBROG techniques, respectively.…”

Section: Research Progressmentioning

confidence: 99%

Experimental Studies and Application of Fiber-Reinforced Polymers (FRPs) in Civil Infrastructure Systems: A State-of-the-Art Review

Albuja-Sánchez,

Damián-Chalán,

Escobar

2024

Polymers

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“…A higher bond strength between FRP and concrete can be obtained with a smaller width ratio of FRP to concrete [22,25,26]. As the debonding of FRP occurred near the surface layer of concrete, the interfacial bearing capacity is obviously influenced by the strength of concrete [27][28][29][30]. However, the concrete strength will be decreased in the occurrence of a fire accident.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bond Behavior between CFRP and Concrete with a Convex-Circular Arc Interface

Qu,

Wei,

et al. 2023

Buildings

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The bond performance of CFRP to concrete plays a vital role in CFRP strengthening on concrete structures. In this paper, an experimental study was carried out to investigate the bond performance of CFRP to concrete with a convex-circular arc interface. The main factors were the curvature of the concrete surface and the bond length and the layers of the CFRP laminate. Based on the experimental results, the failure mode of the bond specimens, the variation of the bond capacity, the CFRP strain, and the bond–slip constitutive model are analyzed. The results showed that most of the specimens failed to peel off the interface concrete, and the bond capacity tended to increase with the increase in bond length when the bond length was within an effective value. When the interface curvature increased to 1/0.8 m, the bond capacity tended to increase due to the CFRP exerting a certain pressure on the concrete surface. The prediction formula of the bond capacity between the CFRP and concrete is proposed considering the influence of the interface curvature. The bond–slip curves are given out based on the finite differential analysis of the strain distribution of CFRP laminates. The accuracy and applicability of the proposed model are verified with a comparison to the test results and other existing models.

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“…As a result, it requires accurate and precise estimation for a reliable and safe reinforced structure design. Through experimental investigations, researchers have developed empirical models for the estimation of BS of FRP while equally understanding the influence of parameters like the bonding length and compressive strength of concrete substrate on it [ 22 , 23 , 24 , 25 , 26 ]. Next, certain empirical prediction models were devised and incorporated in relevant design codes based on theoretical analysis and experimental validation.…”

Section: Introductionmentioning

confidence: 99%

Predicting Bond Strength between FRP Rebars and Concrete by Deploying Gene Expression Programming Model

et al. 2022

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Rebars made of fiber-reinforced plastic (FRP) might be the future reinforcing material, replacing mild steel rebars, which are prone to corrosion. The bond characteristics of FRP rebars differ from those of mild steel rebars due to their different stress-strain behavior than mild steel. As a result, determining the bond strength (BS) qualities of FRP rebars is critical. In this work, BS data for FRP rebars was investigated, utilizing non-linear capabilities of gene expression programming (GEP) on 273 samples. The BS of FRP and concrete was considered a function of bar surface (Bs), bar diameter (db), concrete compressive strength (fc′), concrete-cover-bar-diameter ratio (c/d), and embedment-length-bar-diameter ratio (l/d). The investigation of the variable number of genetic parameters such as number of chromosomes, head size, and number of genes was undertaken such that 11 different models (M1–M11) were created. The results of accuracy evaluation parameters, namely coefficient of determination (R2), mean absolute error (MAE), and root mean square error (RMSE) imply that the M11 model outperforms other created models for the training and testing stages, with values of (0.925, 0.751, 1.08) and (0.9285, 0.802, 1.11), respectively. The values of R2 and error indices showed that there is very close agreement between the experimental and predicted results. 30 number chromosomes, 9 head size, and 5 genes yielded the optimum model. The parametric analysis revealed that db, c/d, and l/d significantly affected the BS. The FRP rebar diameter size is greater than 10 mm, whereas a l/d ratio of more than 12 showed a considerable decrease in BS. In contrast, the rise in c/d ratio revealed second-degree increasing trend of BS.

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An empirical FRP-concrete bond-slip model for externally-bonded reinforcement on grooves

Cited by 34 publications

References 40 publications

Experimental Studies and Application of Fiber-Reinforced Polymers (FRPs) in Civil Infrastructure Systems: A State-of-the-Art Review

Experimental Studies and Application of Fiber-Reinforced Polymers (FRPs) in Civil Infrastructure Systems: A State-of-the-Art Review

Experimental Study on Bond Behavior between CFRP and Concrete with a Convex-Circular Arc Interface

Predicting Bond Strength between FRP Rebars and Concrete by Deploying Gene Expression Programming Model

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