Evaluation of shear behavior of short-span reinforced concrete deep beams strengthened with fiber reinforced polymer strips

Akkaya, Hasan Cem; Aydemir, Cem; Arslan, Guray

doi:10.1016/j.engstruct.2023.117145

Cited by 4 publications

(2 citation statements)

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“…Displacement control was employed to gradually apply the load, utilizing the two RPs assigned to the top cylinder, as depicted in Figure 10(b). The perfect bond and interface element approaches were employed by the researchers to simulate the interfaces of the NSM [12][13][14][15][16][17]. The experimental testing did not reveal significant separation or debonding at the interfaces between the concrete, Sikadur mortar, and NSM components.…”

Section: Fe Model Set-upmentioning

confidence: 99%

“…However, Multiple shear-strengthening strategies, including FRP, and their effects on the response of RC deep beams have been investigated [9][10][11]. Akkaya et al [12] examined the shear performance of reinforced concrete deep beams with short spans that were strengthened using fiber-reinforced polymer (FRP) strips. The study demonstrates that the utilization of FRP strips enhances the shear capacity and behavior of reinforced concrete deep beams.…”

Section: Introductionmentioning

confidence: 99%

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Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Abadel

2024

Materials Science-Poland

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It is essential to retrofit deep beams with shear inadequacies because these beams, although they have the same shear and flexural reinforcements as ordinary beams, are more susceptible to shear failure. Hence, it is of great significance to overcome the shear weaknesses in deep beams. This research paper aims to experimentally examine the effectiveness of near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) for retrofitting reinforced concrete (RC) deep beams subjected to shear forces. The study involved three different types of specimens. The first specimen was constructed with concrete throughout its span and included shear stirrups. The second specimen was divided into two halves, with one half lacking shear reinforcements and the other half having them. The third specimen had steel web reinforcement in one half of the span, while the other half was strengthened using NSM CFRP U-wrap strips and externally bonded horizontal CFRP strips. The proposed strengthening method significantly increased the shear strength of the deep beams, surpassing that provided by steel web reinforcement alone. Furthermore, the NSM CFRP strengthened specimen exhibited a change in failure mode from shear to flexural failure. In comparison to the control beam without stirrups, the beams strengthened with NSM CFRP U-wrap strips demonstrated an impressive 82% improvement in shear strength, while the beam with shear reinforcement showed a 23 % enhancement in load capacity. The proposed strengthened scheme is capable of enhancing the structural performance and load-carrying capacity effectively. A finite element model was generated utilizing ABAQUS software to simulate the behavior of the tested deep beams and verified against the experimental outcomes. The numerical models successfully predicted the behavior of the RC deep beams strengthened with NSM CFRP when compared to the experimental data.

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Section: Fe Model Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Abadel

2024

Materials Science-Poland

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Proposal and evaluation of new models for predicting the FRP contribution to shear strength in reinforced concrete beams using gene expression programming

Alacali,

Akkaya,

Sengun

et al. 2024

Neural Comput & Applic

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Fiber-reinforced polymers (FRP) have been widely used in shear strengthening applications of reinforced concrete (RC) beams. The accurate prediction of the FRP contribution to the shear strength of beams is essential for reliable design. Gene expression programming (GEP) has been widely utilized because it reliably expresses complex relationships between experimental variables. In this study, three new GEP models are proposed for three different strengthening configurations of FRP such as fully-wrapping, U wrapping, and side-bonding to predict the FRP contribution to shear strength. These models are developed using the most comprehensive database containing a total of 811 strengthened beams (350 fully-wrapped, 328 U-wrapped, and 133 side-bonded. Many variables have been considered in the proposed GEP models, including those that have been experimentally effective but are often neglected in existing literature equations, such as the shear span-to-effective depth ratio $$(a/d)$$ ( a / d ) and the stirrup ratio ($${\rho }_{w}$$ ρ w ). Additionally, the reliability of existing equations in the literature and the proposed GEP models for predicting the FRP contribution to shear strength was statistically evaluated. As a result of this evaluation, the proposed GEP models for each strengthening configuration of FRP yielded the most accurate statistical results, with the lowest coefficient of variation (COV), and the highest coefficient of correlation (R).

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Shear capacity analysis of fiber reinforced polymer concrete beams

Sharif

2024

Discov Civ Eng

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Evaluation of shear behavior of short-span reinforced concrete deep beams strengthened with fiber reinforced polymer strips

Cited by 4 publications

References 73 publications

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Proposal and evaluation of new models for predicting the FRP contribution to shear strength in reinforced concrete beams using gene expression programming

Shear capacity analysis of fiber reinforced polymer concrete beams

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