Effect of axial stiffness of NSM FRP reinforcement and concrete cover confinement on flexural behaviour of strengthened RC beams: Experimental and numerical study

Sharaky, I.A.; Baena, Marta; Barris, Cristina; Sallam, Hossam El-Din M.; Torres, Lluís

doi:10.1016/j.engstruct.2018.07.062

Cited by 74 publications

(23 citation statements)

References 36 publications

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“…Focusing on the existing experimental work, the flexural behavior of NSM strengthened concrete beams under room temperature have been widely studied in the literature [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ], while the structural performance of this technique under elevated temperature and high service temperature is still an open topic that needs detailed research. The fire resistance of FRP-strengthened RC flexural elements has been analyzed in different studies [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of High Service Temperature on the Flexural Performance of Near-Surface Mounted (NSM) Carbon Fiber-Reinforced Polymer (CFRP)-Strengthened Concrete Beams

et al. 2021

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This paper presents a study of the effect of high service temperature (near or beyond glass transition temperature (Tg) of structural epoxy adhesive) on the behavior of near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP)-strengthened reinforced concrete (RC) beams. The study includes experimental work as well as analytical and numerical analysis. To this end, fourteen beams have been tested up to failure in two different series. In series 1, specimens with three different CFRP areas have been tested at two different temperatures (i.e., 20 and 40 °C). In series 2, and with the aim of evaluating the effect of higher temperatures, only one CFRP area was tested under four different temperatures (i.e., 20, 60, 70, and 85 °C). Experimental results are evaluated in terms of load–deflections, failure modes, and bond performance. Furthermore, the experimental load–deflection curves are satisfactorily compared to both analytical predictions and finite element (FE) numerical simulations. In both cases, shrinkage and temperature effects on the short-term response of flexural elements have been accounted for. No significant reduction in stiffness and ultimate load was observed for specimens being tested up to 60 °C (in the range of epoxy Tg), showing FRP rupture failure in all of them. For specimens under 70 and 85 °C, the failure mode changed from FRP rupture to FRP end debonding and concrete crushing, respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of High Service Temperature on the Flexural Performance of Near-Surface Mounted (NSM) Carbon Fiber-Reinforced Polymer (CFRP)-Strengthened Concrete Beams

et al. 2021

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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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“…Bonding FRP materials is a new retrofitting or strengthening method for enhancing shear and flexural performance of existing reinforced concrete (RC) beams [7][8][9]. The effects of FRP materials which are externally bonded to the beams on flexure and/or shear capacity of beams have been investigated by previous experimental and numerical studies [3][4][5], [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In these studies, it is seen that the FRP composites are utilized as externally epoxy-bonded reinforcement to enhance the structural strength and stiffness, ductility and seismic performance of the RC beams.…”

Section: Introductionmentioning

confidence: 99%

An investigation on the flexural behaviour of RC beams wrapped with CFRP

Dalyan¹,

Doran

2021

International Advanced Researches and Engineering Journal

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In addition to conventional retrofitting of constructions, new technologies are rapidly being developed to withstand the external effects while sustaining an acceptable level of damage. Reinforced concrete structures strengthened with fiber reinforced polymer composite materials are becoming more and more widespread in structural applications due to their better mechanical properties, resistance to environmental influences, ease of application and light weight, as well as conventional methods of strengthening. In this study, strengthening technique as a methodology for externally bonded with carbon fiber reinforced polymer (CFRP) sheets to increase the flexural resistance of reinforced concrete beams has been investigated. For this purpose, eight reinforced concrete beams were produced considering different types of CFRP configuration and tested under four-point bending loading. The dimensions of the beams are 150×250×2600 mm and concrete cover of the first and second group of test beam are 20 mm and 40 mm, respectively. Finally, loaddeflection behavior with the failure mechanism of the tested beams have been discussed and the effect of different schemes of strengthening on the flexural behavior has been evaluated.

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Effect of axial stiffness of NSM FRP reinforcement and concrete cover confinement on flexural behaviour of strengthened RC beams: Experimental and numerical study

Cited by 74 publications

References 36 publications

Experimental Study of the Effect of High Service Temperature on the Flexural Performance of Near-Surface Mounted (NSM) Carbon Fiber-Reinforced Polymer (CFRP)-Strengthened Concrete Beams

Experimental Study of the Effect of High Service Temperature on the Flexural Performance of Near-Surface Mounted (NSM) Carbon Fiber-Reinforced Polymer (CFRP)-Strengthened Concrete Beams

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

An investigation on the flexural behaviour of RC beams wrapped with CFRP

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