Experimental and numerical study of RC beams strengthened with bottom and side NSM GFRP bars having different end conditions

Sharaky, I.A.; Reda, Ramy M.; Ghanem, Mohamed Ahmed; Seleem, M. H.; Sallam, Hossam El-Din M.

doi:10.1016/j.conbuildmat.2017.05.192

Cited by 59 publications

(20 citation statements)

References 32 publications

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“…Over the last twenty years, a great deal of research was deployed to the behavior and flexural strength of RC members strengthened by NSM FRP rods. Previous studies focuses on many aspects of the behavior of RC beams strengthened NSM GFRP rods such as ultimate flexural and shear capacities, ultimate deflection and the failure modes [6][7][8][9][10][11][12][13][14][15]. Furthermore, A lot of laboratory experimental works were carried out to explore the bonding behavior between NSM FRP bars and concrete, the effect of FRP anchorage system, NSM FRP length, type of epoxy, dimensions of grooves, size, shape, and type of rebars and concrete strength [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of concrete cover thickness and main reinforcement ratio on flexural behavior of RC beams strengthened by NSM-GFRP bars

El-Emam

El-Sisi

Reda

et al. 2020

Frattura Ed Integrità Strutturale

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Experimental and numerical programs were conducted to investigate the effect of concrete cover and area of main steel reinforcement on the flexural behavior of strengthened RC beams by near-surface mounted glass fiber reinforced polymeric (NSM GFRP) bars of different lengths. Nine beams divided into three main groups were tested under four-point bending. The three beams of the first group were strengthened by different lengths of GFRP bars and having a concrete cover of 50 mm, while the three beams in the second group were strengthened in a similar manner as those of the first group but the concrete cover was 30 mm. The main steel reinforcement in the first and second groups was 2Ø10. The three beams of the third group were similar to those of the first and second group but the main steel reinforcement was 2Ø16. The 3-D FE commercial ANSYS program was used for the numerical work. The experimental results showed that decreasing the concrete cover increased the flexural capacity of the strengthened RC beams but this improvement disappeared by decreasing the NSM GFRP bar length. The numerical results showed an agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Effect of concrete cover thickness and main reinforcement ratio on flexural behavior of RC beams strengthened by NSM-GFRP bars

El-Emam

El-Sisi

Reda

et al. 2020

Frattura Ed Integrità Strutturale

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“…Therefore, the NSM strengthening technique offers an effective substitute (ACI, 2012(ACI, , 2017Barros et al, 2007;Barros and Kotynia, 2008;Akbarzadeh and Maghsoudi, 2010;Zhou et al, 2013). Recently, many different strengthening techniques have been explored in an attempt to improve the service life of concrete structures (Sharaky et al, 2015(Sharaky et al, , 2017(Sharaky et al, , 2018(Sharaky et al, , 2020EL-Emam et al, 2020;Sallam et al, 2004;Brena et al, 2003;Tang et al, 2006;Nguyen et al, 2001;Hawileh et al, 2014). Several studies have been carried out using fiber-reinforced polymer (FRP) materials to explore the flexural behavior of RC beams strengthened with NSM (Soliman et al, 2010;El-Hacha and Rizkalla, 2004;El-Hacha and Gaafar, 2011;De Lorenzis et al, 2000;Badawi and Soudki, 2009;Al-Mahmoud et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Effects of tensile reinforcing steel ratio and Near-Surface-Mounted bar development length on the structural behavior of strengthened RC beams

El-Emam

El-Sisi

Bneni

et al. 2020

Lat. Am. j. solids struct.

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The use of near-surface mounted (NSM) Glass fiber reinforced polymer (GFRP) bars is one of the most popular and effective techniques for strengthening reinforced concrete (RC) beams. This paper presents an experimental research program to study the flexural strengthening of RC beams comparing two areas of bottom tensile reinforcing steel and three development lengths of NSM GFRP bars. The beam test results indicated that the beam flexural strength increased up to 110% and 58% for the cases of low and high tensile reinforcing steel ratios, respectively. The effect of the tensile reinforcing steel area on the critical value of the development length of NSM GFRP bars was also investigated. It was found that decreasing the axial stiffness ratio, reduced the strengthening efficiency and the critical development length of the NSM GFRP bars. Finally, a 3D Finite Element (FE) model using ANSYS was constructed and was validated using the experimental results. Good agreement was seen between experimental and FE model results.

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“…e greater confinement granted by the adhesive and the surrounding concrete is considered the best advantage provided by the NSM method [2]. is strengthening technique has already been proven to be effective for the shear strengthening [3][4][5][6] and flexural strengthening of RC beams [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Many studies have used conventional steel bars instead of FRP materials for beam strengthening by employing the NSM method [21,[23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have applied the NSM FRP strengthening method to improve the flexural and shear strength of RC beams [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], whilst others have used conventional steel bars instead of FRP materials for flexural and shear strengthening [21][22][23][24][25][26][27][28]. However, only few of these studies have focused on torsion strengthening [29][30][31]32] and no previous work has investigated the application of conventional steel bars for the torsion strengthening of RC beams.…”

Section: Introductionmentioning

confidence: 99%

Torsional Strengthening of RC Beams with Near‐Surface Mounted Steel Bars

Askandar

Mahmood

2020

Advances in Materials Science and Engineering

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e strength of reinforced concrete members can be enhanced by using the externally bonded reinforcement (EBR) and nearsurface mounted (NSM) methods. However, very few studies have adopted the NSM method for torsional strengthening. Although previous studies have reported the efficacy of using epoxy-resin-bonded NSM steel bars in increasing the flexural and shear strength of RC beams, no study has examined the use of steel bars and epoxy adhesives for torsional strengthening.erefore, this study investigates the behaviour of RC beams subjected to the combined actions of torsion and bending moment when they are strengthened with NSM steel bars (Ø10 mm) in different configurations. e practical part of this investigation consisted of seven cast and tested beams of 150 × 250 × 2000 mm dimensions. One beam was reference, which is not strengthened; meanwhile, all the other beams were strengthened with two U-shape-welded NSM steel bars. During the testing process, the twist angle at the torque intervals, first cracking torque, ultimate torque, and ultimate twist angle of the conventional beam were compared with those of the strengthened beams. e torsional performance of the RC beams was significantly improved by using NSM steel bars, whereas in various NSM configurations, the 90°NSM beams outperformed the 45°NSM beams.

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Experimental and numerical study of RC beams strengthened with bottom and side NSM GFRP bars having different end conditions

Cited by 59 publications

References 32 publications

Effect of concrete cover thickness and main reinforcement ratio on flexural behavior of RC beams strengthened by NSM-GFRP bars

Effect of concrete cover thickness and main reinforcement ratio on flexural behavior of RC beams strengthened by NSM-GFRP bars

Effects of tensile reinforcing steel ratio and Near-Surface-Mounted bar development length on the structural behavior of strengthened RC beams

Torsional Strengthening of RC Beams with Near‐Surface Mounted Steel Bars

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