Evaluation of the flexural strength and serviceability of concrete beams reinforced with different types of GFRP bars

El-Nemr, Amr; Ahmed, Ehab A.; ElSafty, Adel; Benmokrane, Brahim

doi:10.1016/j.engstruct.2018.06.089

Cited by 103 publications

(25 citation statements)

References 8 publications

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“…The calculation error of the CSA specification is relatively large, and the coefficient of variation of all calculation results of the specification was more than 20%. Amr El-Nemr et al [37] believed that the difference in the calculation of the flexural capacity of FRP-reinforced beams was due to the value of ultimate strain of concrete used in these codes. Among them, the ultimate strain of CSA [9] was 0.0035 µε.…”

Section: Suitability Of Using Calculation Formulas Of Different Specimentioning

confidence: 99%

Comparative Study of Steel-FRP, FRP and Steel-Reinforced Coral Concrete Beams in Their Flexural Performance

Wang

Zhang

Huang³

et al. 2020

Materials

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In this study, a comparative study of carbon fiber reinforced polymer (CFRP) bar and steel–carbon fiber composite bar (SCFCB) reinforced coral concrete beams was made through a series of experimental tests and theoretical analyses. The flexural capacity, crack development and failure modes of CFRP and SCFCB-reinforced coral concrete were investigated in detail. They were also compared to ordinary steel-reinforced coral concrete beams. The results show that under the same conditions of reinforcement ratios, the SCFCB-reinforced beams exhibit better performance than CFRP-reinforced beams, and stiffness is slightly lower than that of steel-reinforced beams. Under the same load conditions, the crack width of SCFCB beams was between that of steel-reinforced beams and CFRP bar-reinforced beams. Before the steel core yields, the crack growth rate of SCFCB beam is similar to the steel-reinforced beams. SCFCB has a higher strength utilization rate—about 70–85% of its ultimate strength. Current design guidance was also examined based on the test results. It was found that the existing design specifications for FRP-reinforced normal concrete is not suitable for SCFCB-reinforced coral concrete structures.

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Section: Suitability Of Using Calculation Formulas Of Different Specimentioning

confidence: 99%

Comparative Study of Steel-FRP, FRP and Steel-Reinforced Coral Concrete Beams in Their Flexural Performance

Wang

Zhang

Huang³

et al. 2020

Materials

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“…The replacement of non-corrosive fibre-reinforced polymer (FRP) bars with steel bars in engineering structures is one of the most effective methods of solving the problems of concrete expansion, concrete cover spalling off, and structural strength reduction caused by steel corrosion (Abedini and Zhang, 2021; American Concrete Institute (ACI), 2015; Benmokrane and Masmoudi, 1996;Dong et al, 2018;GangaRao et al, 2006;Monaldo et al, 2019;Parandoush and Lin, 2017;Quagliarini et al, 2016;Sun et al,2020;Vijay and GangaRao, 2001). FRP-reinforced concrete members have the advantages of high flexural strength and good durability, but the two inherent limitations of FRP bars, namely, low elastic modulus and poor ductility, limit their application in engineering structures (Abdalla, 2002;El-Nemr et al, 2018;GangaRao et al, 2006;Yuan and Wu, 2019;Zhang et al, 2021). The combined use of FRP and steel bars, in which FRP bars are placed at the corners of concrete members that are susceptible to corrosion, achieves a good corrosion resistance, high post-yield stiffness and small residual deformation (Aiello and Ombres, 2002;Bakis et al, 2001;Ge et al, 2015;Jo et al, 2004;Lau and Pam, 2010;Nanni et al, 1994;Qin et al, 2017;Qu et al, 2009;Yuan and Chen, 2018).…”

Section: Introductionmentioning

confidence: 99%

Flexural behaviour of ECC and ECC–concrete composite beams reinforced with hybrid FRP and steel bars

Yuan

2021

Advances in Structural Engineering

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Owing to the good ductility of steel and high strength and excellent corrosion resistance of fibre-reinforced polymer (FRP), concrete beams reinforced with hybrid steel and FRP bars exhibit better ductility than FRP-reinforced concrete beams as well as higher load-carrying capacities and better corrosion resistance than steel-reinforced concrete beams. However, the inherent brittleness of concrete in tension results in steel corrosion because of wide cracks and accelerated fracture of FRP reinforcement because of crack-induced stress concentration. This study investigated the effects of ultra-high ductile engineered cementitious composites (ECCs) on the flexural behaviour of hybrid steel and FRP-reinforced beams. Six hybrid-reinforced beams with various reinforcement ratios, matrix types and ECC pouring positions were tested in four-point bending. The flexural behaviours of the beams in terms of failure modes, crack patterns and developments, load versus deformation relationships and ductility are discussed herein in detail. We observed that substituting ECC with concrete results in a higher load-carrying capacity and better ductility of the hybrid reinforced beams owing to the excellent characteristics of ECC materials. When a layer of ECC is poured in the tension zone, the average crack width and crack spacing along the beam decrease; therefore, the longitudinal reinforcements can be adequately protected.

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“…Direct yielding effects are larger crack widths and deflections under service loads compared with beams reinforced with conventional steel bars. Additional disadvantages are related to linear elastic behavior with no yielding zones and long-term durability of FRP bars in the concrete environments [1][2][3][4]. Most types of FRP bars with low elastic modulus and relatively poor bond to concrete directly indicate the behavior of structural elements [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

et al. 2021

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There are several reasons why civil and structural engineers should use Fiber Reinforced Polymer bars in concrete. The primary reason is durability, and other relevant parameters, high strength and, lightweight. Non-corrosive attributes make their use particularly suitable in different situations. Due to low elastic modulus and poor bonding, the use of Fiber Reinforced Polymer results in larger crack widths under serviceability limit state especially beams reinforced with glass fiber bars. The study purpose of this paper is to investigate the kb values. The methodology of this paper is comparing the analytical and experimental results. The investigation included 12 beams, using the four-point load test. The geometrical parameters of tested beams with dimensions: 130×220×2200 mm, reinforced with different diameters, helically-grooved glass fiber bars, and sand-coated carbon fiber bars. The measured cracks were used to assess the current kb values recommended in the design codes and guides. The findings did not support the use of the same kb value for different bars because, in addition to the type of bar, the value of kb is also affected by the type of surface and the diameter of the bar. What is observed based on results shows that CFRP bars have a more constant value depending on the diameter, while GFRP bars have large value changes depending on the diameter. Doi: 10.28991/cej-2021-03091722 Full Text: PDF

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Evaluation of the flexural strength and serviceability of concrete beams reinforced with different types of GFRP bars

Cited by 103 publications

References 8 publications

Comparative Study of Steel-FRP, FRP and Steel-Reinforced Coral Concrete Beams in Their Flexural Performance

Comparative Study of Steel-FRP, FRP and Steel-Reinforced Coral Concrete Beams in Their Flexural Performance

Flexural behaviour of ECC and ECC–concrete composite beams reinforced with hybrid FRP and steel bars

Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

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