Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

Hosen, Md. Akter; Jumaat, Mohd Zamin; Sulong, N.H. Ramli; Darain, Kh Mahfuz ud

doi:10.3390/polym9050180

Cited by 35 publications

(18 citation statements)

References 41 publications

(51 reference statements)

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“…From the crack location, symmetric distribution was presented. e failure mode of CB-2 is similar to the reinforcement concrete beams' failure mode in bending with GFRPS [28] or CFRPS [29]. (Table 8) showed that the use of NSM screw-thread steels and NSM …”

Section: Specimen Cb-3mentioning

confidence: 71%

“…Flexural cracks are present in the vertical stone slab surface direction. Crack formation process is similar to concrete members [21][22][23][24][25][26][27][28][29]. e following section presents the detailed failure progress and failure mode.…”

Section: Resultsmentioning

confidence: 99%

“…e failure mode of GB-5 is shown in Figure 24, and the crack location is shown in Figure 25. e failure mode is similar to the reinforcement concrete beams' failure mode in bending with GFRPS [29] or CFRPS [30]. e failure mode is ductile failure.…”

Section: Specimen Gb-5mentioning

confidence: 87%

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Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

Gao

Chen

Ding

et al. 2018

Advances in Materials Science and Engineering

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An experimental study that investigates the behavior of stone slabs strengthened in fixure with near surface mounted (NSM) technique using screw-thread steels and carbon fiber-reinforced polymer (CFRP) bars is presented. A total of ten full-scale stone slabs were tested under a four-point bending loading to investigate the effect of groove dimension, reinforcement ratios, and reinforcement materials on the flexural performance of stone slabs. e test results included failure characteristics, yield and ultimate capacities, deflection of midspan, and cracking behavior of stone slabs. e test results indicate that with the increase of groove height and groove width, cracking load and middeflection decrease by 6.4%-14.18%; however, failure load and middeflection increase by 4.7%-41.2%. Cracking load, failure load, and failure displacement of stone slabs adopting NSM screwthread steels increased by 10.9%, 167%, and 617%, respectively, under the maximum reinforcement ratios of 0.629% over the control slab without NSM bars. Meanwhile, with the increase of reinforcement ratios, the failure mode transforms from brittle failure to ductile failure. e calculation results of strength are in agreement with the experimental results. Finally, it can be concluded that NSM CFRP bars are more effective than NSM screw-thread steels to improve flexural capacity with the same reinforcement ratios.

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Section: Specimen Cb-3mentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

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Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

Gao

Chen

Ding

et al. 2018

Advances in Materials Science and Engineering

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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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Effectiveness of external prestressing in enhancing the non-ductile hanger failure mechanism in reinforced concrete inverted T-beams

Atta,

Behiry,

Haraz

2024

Front. Struct. Civ. Eng.

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Recently, inverted T-beams have been used in reinforced concrete (RC) bridges to support transverse precast stringers. Inverted T-beams, contrary to practice with conventional beams, are loaded on the flanges upper surface. This loading configuration causes hanger failure due to the generation of vertical tensile stresses near the bottom of the web. The key purpose of this study is to investigate the efficiency of vertical external prestressing stainless-steel bars in mitigating non-ductile hanger failure in reinforced concrete inverted T-beams. An experimental study on six inverted-T beams, including two un-strengthened specimens, was carried out. The study showed that the value of the prestressing level had a considerable impact on the performance of hanger mechanism in relation to crack pattern, ultimate loads, cracking behavior, load–deflection, strains, and ductility. The experimental results indicated that the suggested method for strengthening inverted T-beams had efficacy in reducing the seriousness of the non-ductile hanger failure and resulted in a strength increase of up to 53% when compared to that of the un-strengthened specimen. Additionally, two analytical models for estimating the hanger capacity and the average crack width of the strengthened RC inverted T-beams were proposed. The models that were proposed exhibited a high degree of agreement with the experimental results.

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Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

Cited by 35 publications

References 41 publications

Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

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

Effectiveness of external prestressing in enhancing the non-ductile hanger failure mechanism in reinforced concrete inverted T-beams

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