Flexural behavior of RC beams strengthened by NSM GFRP Bars having different end conditions

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

doi:10.1016/j.compstruct.2016.03.018

Cited by 55 publications

(21 citation statements)

References 28 publications

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“…The RC beams strengthened with the near surface mounted technique (NSM) using CFRP bars increased the first cracking load up to 76% [17]. However, RC beams that were strengthened using GFRP bars by the NSM technique reported an increase of their first cracking load of up to 56% [13].…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…However, the NSM-GFRP bars with end anchorage resulted in an enhanced ultimate load carrying capacity of up to 101% compared with the control beam [13]. The NSM-steel and NSM-GFRP increased the ultimate load till 30% and 24%, respectively [15].…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…The dominant failure mode of these strengthened beams was debonding. Reda et al [13] studied the flexural performance of NSM-GFRP bar-strengthened RC beams using different end-anchorage conditions. The NSM technique using GFRP bars and end-anchorage revealed higher stiffness and improved failure modes compared to strengthened beam without end anchorage.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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Reinforced concrete (RC) structures require strengthening for numerous factors, such as increased load, modification of the structural systems, structural upgrade or errors in the design and construction stages. The side near-surface mounted (SNSM) strengthening technique with glass fiber-reinforced polymer (GFRP) bars is a relatively new emerging technique for enhancing the flexural capacities of existing RC elements. Nine RC rectangular beams were flexurally strengthened with this technique and tested under four-point bending loads until failure. The main goal of this study is to optimize the structural capacity of the RC beams by varying the amount of strengthening reinforcement and bond length. The experimental test results showed that strengthening with SNSM GFRP bars significantly enhanced the flexural responses of the specimens compared with the control specimen. The first cracking and ultimate loads, energy absorption capacities, ductility and stiffness were remarkably enhanced by the SNSM technique. It was also confirmed that the bond length of the strengthened reinforcement greatly influences the energy absorption capacities, ductility and stiffness. The effect of the bond length on these properties is more significant compared to the amount of strengthening reinforcement.

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Section: Test Results and Discussionmentioning

confidence: 99%

Section: Test Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…Studies have investigated the effects of mechanical properties, FRP bar cross-section area, and the type of adhesive epoxy on the beam flexural strength and the load-carrying capacity of strengthened beams using the NSM technique (Sharaky et al 2013(Sharaky et al , 2014Reda et al, 2016;Shabana et al, 2018). It has been found that the maximum load-carrying capacity of the beams strengthened with NSM FRP is significantly affected by the stiffness the FRP bars used.…”

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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“…The concrete beams strengthened with NSM FRP reinforcement typically exhibit brittle failure. This brittle failure can be attributed to mechanical properties of FRPs, the debonding of NSM FRP reinforcement, or excessive reinforcement ratio . Carbon fiber reinforced polymers (CFRPs) have been the most commonly studied material for the NSM strengthening applications.…”

Section: Introductionmentioning

confidence: 99%

Behavior and failure modes of reinforced concrete beams strengthened with NSM GFRP or aluminum alloy bars

Xing

Chang

Ozbulut

2018

Structural Concrete

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Although the use of near‐surface mounted (NSM) fiber reinforced polymer (FRP) reinforcement satisfactorily enhances the flexural capacity of deficient reinforced concrete beams, the concrete beams strengthened with NSM FRPs typically exhibit brittle behavior. Aluminum alloy (AA) bars possess non‐corrosive characteristics like FRPs but also exhibit a nonlinear tensile response with a clear yield point. This paper investigates the failure modes of reinforced concrete beams strengthened with either NSM glass FRP (GFRP) bars or AA bars. A total of six concrete beams including one control beam were tested under four‐point bending. The effects of NSM reinforcement type, internal steel reinforcement ratio, and NSM reinforcement ratio on the failure behavior of the strengthened beams were examined. The ultimate flexural load capacity, ductility index, energy absorption capacity, strains in steel reinforcement and in concrete, and cracking behavior for each tested beam were determined and analyzed. The results indicated that for the same NSM reinforcement ratio, the NSM GFRP bars provided considerably higher increases in the flexural strength of reinforced concrete beams compared to the AA bars. However, the beams strengthened with AA bars showed more ductile response compared to the beams strengthened with NSM GFRP bars.

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Flexural behavior of RC beams strengthened by NSM GFRP Bars having different end conditions

Cited by 55 publications

References 28 publications

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

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

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

Behavior and failure modes of reinforced concrete beams strengthened with NSM GFRP or aluminum alloy bars

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