Experimental study of deflection of steel fibre reinforced concrete beams: comparison of different design codes

Hamrat, Mostefa; Boulekbache, Bensaid; Tahenni, Touhami; Chemrouk, Mohamed; Amziane, Sofiane

doi:10.1080/19648189.2020.1749941

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…To better analyze this behavior, also observed by Hamrat et al, 10 it is possible to evaluate, for a given deflection η, the difference (in percent) between load measured in fiber-reinforced concrete beams and that of reinforced concrete beams: Figure 3a shows the values of Δp computed at η = 7 mm (which is 1/500 of the constant moment length in Figure 1a) in the R/FRC beams tested herein. These values depend on the type of FRC (i.e., B or C) and on the ratio ρ eff of the reinforcement in tension with respect to the effective area.…”

Section: Resultsmentioning

confidence: 89%

∆ p = \frac{P_{normalR / FRC} - P_{RC}}{P_{RC}} ∙ 100

where, P R/FRC = load measured in the R/FRC beam at deflection η ; P RC = load measured in RC beam for the same deflection.…”

Section: Resultsmentioning

confidence: 99%

“…9 Nevertheless, deflections in R/FRC beams are not always lower than those of RC beams, as recently shown by Hamrat et al. 10 Indeed, the influence of steel fibers in increasing the stiffness of cracked cross-sections depends on the amount of longitudinal rebar in tension. 11 Moreover, models used to calculate the deflection of RC beams, and based on the definition of a single momentcurvature (M-χ) relationship, 12 are not always effective in computing the deformation of R/FRC beams.…”

Section: Introductionmentioning

confidence: 84%

“…Also, the stiffness of FRC structures is expected to be greater than that of plain concrete structures 9 . Nevertheless, deflections in R/FRC beams are not always lower than those of RC beams, as recently shown by Hamrat et al 10 . Indeed, the influence of steel fibers in increasing the stiffness of cracked cross‐sections depends on the amount of longitudinal rebar in tension 11 .…”

Section: Introductionmentioning

confidence: 85%

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The deflection of reinforced concrete beams containing recycled steel fibers

Fantilli

Orfeo

Caldentey

2021

Structural Concrete

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Section: Resultsmentioning

confidence: 89%

∆ p = \frac{P_{normalR / FRC} - P_{RC}}{P_{RC}} ∙ 100

where, P R/FRC = load measured in the R/FRC beam at deflection η ; P RC = load measured in RC beam for the same deflection.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 85%

See 2 more Smart Citations

The deflection of reinforced concrete beams containing recycled steel fibers

Fantilli

Orfeo

Caldentey

2021

Structural Concrete

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“…Their use in new constructions is not yet widespread. Some countries, such as Russia [6][7] and Canada [8], adopt calculation codes for the use of synthetic fiber composites as primary frames. Some works are done in civil engineering to compare natural fiber reinforced polymer and carbon fiber reinforced polymer in strengthening of reinforced concrete beams [9].…”

Section: Introductionmentioning

confidence: 99%

Alfa Natural Fiber Composite Reinforcement for Concrete Beams

Helaili¹,

Chafra²,

Chevalier³

2021

cea

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Lightweight, corrosion-resistant, and longer-lasting composite materials are increasingly used as primary load-bearing materials in structures' design. The cost of rehabilitating structures is lower than that of demolishing and rebuilding them again. Therefore, economical, and eco-friendly materials could extend the life of the structures and reduce the carbon di-oxide footprint on the environment. The purpose of this paper is to present a composite hollow body that can be inserted in reinforced concrete beams. The priority was to use more economical, biodegradable, and recyclable local natural fibers. The goal is to get lighter but stronger beams. The main innovation on this work is the usage of a composite made from natural fiber. A 3D finite element model of the 5 m span beam is developed to see in detail the beam's behavior and the composite reinforcement behavior. A classical reinforced concrete beam is compared to composite shells reinforced one. As a result, the beam is lightened, the deformation is relatively reduced, the traction in concrete is reduced, and the stress in steel bars is increased but remains far from the steel's elastic limit. An experimental work was done based on 40 mm x 40mm x160 mm beams to verify the correlation of the finite element model parameters with experimental results. The results show a good correlation. The weight of the beam 5 m span beam is reduced by 26.65% without affecting its behavior. For the reinforced and non-reinforced 5 m span beams, at a similar deflexion of nearly 0.7 mm, similar stress in concrete of about 2.3 MPa and similar stress in steel bars of about 10 to 13 MPa, the maximal stress in the composite is equal to 0.460 MPa which is insignificant compared to the composite failure stress, which is about 229 MPa. The composite has a long-life and can support the efforts if the beam must be rehabilitated, for example. Consequently, lightened beams can be used in reinforced concrete structures made of non-lightened elements and have the same structural behavior.

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