Experimental analysis of the efficiency of steel fibers on shear strength of beams

Gomes, Lana; Oliveira, Dênio Ramam Carvalho de; Neto, Bernardo Nunes de Moraes; Medeiros, Adelson Bezerra de; Macêdo, Alcebíades Negrão; Silva, Francisco André Castro e

doi:10.1590/1679-78254710

Cited by 8 publications

(4 citation statements)

References 16 publications

(22 reference statements)

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“…It was evident that the reinforcement ratio over 1% allowed an increase up to 20% in the shear strength in SFRC, as observed in beams VF-1 and VF-2. [20], which represents an estimate for the failure modes of the beams, which can be by shear with indicated that all beams presented shear failure, as observed in the tests. Figures 12a and 12b clearly show the behavior of the flexural reinforcement influence in the failure mode, a similar linear behavior for both the RC beams and the SFRC beams.…”

Section: Effect Of Longitudinal Reinforcementmentioning

confidence: 84%

Experimental analysis of steel fiber reinforced concrete beams in shear

Nzambi

Oliveira

Monteiro

et al. 2022

Rev. IBRACON Estrut. Mater.

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Some normative recommendations are conservative in relation to the shear strength of reinforced concrete beams, not directly considering the longitudinal reinforcement rate. An experimental program containing 8 beams of (100 x 250) mm2 and a length of 1,200 mm was carried out. The concrete compression strength was 20 MPa with and without 1.00% of steel fiber addition, without stirrups and varying the longitudinal reinforcement ratio. Comparisons between experimental failure loads and main design codes estimates were assessed. The results showed that the increase of the longitudinal reinforcement ratio from 0.87% to 2.14% in beams without steel fiber led to an improvement of 59% in shear strength caused by the dowel effect, while the corresponding improvement was of only 22% in fibered concrete beams. A maximum gain of 109% in shear strength was observed with the addition of 1% of steel fibers comparing beams with the same longitudinal reinforcement ratio (1.2%). A significant amount of shear strength was provided by the inclusion of the steel fibers and allowed controlling the propagation of cracks by the effect of stress transfer bridges, transforming the brittle shear mechanism into a ductile flexural one. From this, it is clear the shear benefit of the steel fiber addition when associated to the longitudinal reinforcement and optimal values for this relationship would improve results.

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Section: Effect Of Longitudinal Reinforcementmentioning

confidence: 84%

Experimental analysis of steel fiber reinforced concrete beams in shear

Nzambi

Oliveira

Monteiro

et al. 2022

Rev. IBRACON Estrut. Mater.

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“…Notably, the ultimate shear strength exhibited the most substantial improvement of 164% in two beams: the first beam was reinforced with 1.5% steel fibres and stirrups (diameter 6 mm, spacing 200 mm), while the second beam was reinforced with 1.0% steel fibres and stirrups (diameter 6 mm, spacing 100 mm) [12]. Another study [13] investigated four beams, comprising a control beam without steel fibres and three beams with steel fibres added at ratios of 0.5%, 0.8%, and 1%. The researchers concluded that the inclusion of steel fibres improved the shear capacity of the tested beams, transforming the failure mode from brittle to flexural.…”

Section: Introductionmentioning

confidence: 99%

Performance of RC Beams under Shear Loads Strengthened with Metallic and Non-Metallic Fibers

Ghali,

El-Sayed,

Salah

et al. 2024

Buildings

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In our investigation, we subjected eleven reinforced concrete beams to a four-point bending system to explore the impact of varying fibre and ferrocement contents on their structural behaviour. These beams, measuring 1.7 m in length, featured a rectangular cross-section with dimensions of 150 mm by 300 mm. Our study focused on three key variables: steel fibre content (at levels of 0.5%, 1%, and 1.5%), glass fibre content (also at 0.5%, 1%, and 1.5%), and ferrocement content (evaluated with one or two layers of welded or expanded wire mesh). Our findings revealed that incorporating fibres with minimal shear reinforcement significantly enhanced the beams’ performance. Specifically: The specimen reinforced with 1.5% steel fibres exhibited the highest ultimate failure load, surpassing the control beam by an impressive 41.87%. The 0.5% glass fibre specimen experienced the least deflection at the ultimate load compared to the control beam. The 1.5% glass fibre specimen demonstrated superior energy absorption compared to the control specimen. Notably, using two layers of welded wire mesh proved most effective in enhancing the ultimate failure load when compared to both the control specimen and other ferrocement-strengthened beams.

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“…Tahenni et al (2016) presented effect of steel fibers on the shear behavior of high strength concrete beams. Gomes et al (2018) presented experimental analysis of the efficiency of steel fibers on shear strength of beams. Hamoodi et al (2021) presented a shear behavior of fiber-reinforced concrete beams: an experimental study.…”

Section: Introductionmentioning

confidence: 99%

Effect of steel fibers and the fiber-concrete adhesion stress on the nonlinear shear behavior of beams

Zarga,

Younsi

2024

SEES

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In this article, a theoretical model in nonlinear elasticity is presented to analyze the influence of the percentage of steel fibers and the effect of the fiber-concrete bond stress on the shear force at the rupture of beams subjected to the combined effect of bending moment, normal force, and shear force. For a given beam section, it is defined by a succession of layers of concrete and longitudinal steel elements. Each layer is defined by its height hi, width bi, and position relative to one end of the section YGi. Each longitudinal steel element is also defined by its cross-sectional area and position relative to one end of the section. The steel fibers are defined by volume percentages of 0.5%, 1%, 1.5%, and 2%, taking into account the mechanical nonlinearity of the materials. This model is based on the multilayer analysis of sections and an iterative solution procedure for each layer and each section, considering a given longitudinal deformation state and shear stress. The global equilibrium of the sections is analyzed under the assumption of flat longitudinal deformations but with, in principle, an interdependence of longitudinal normal stresses and shear stresses. In this study, using the principle of virtual work, equilibrium equations for deformations and stresses, as well as partial compatibility equations between concrete deformations and mean deformations, are derived. Comparative examples between ordinary reinforced concrete beams with variable shapes and reinforcement details, and those reinforced with steel fibers, are presented to demonstrate the accuracy of the proposed model for simulating the nonlinear shear response of beams.

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Experimental analysis of the efficiency of steel fibers on shear strength of beams

Cited by 8 publications

References 16 publications

Experimental analysis of steel fiber reinforced concrete beams in shear

Experimental analysis of steel fiber reinforced concrete beams in shear

Performance of RC Beams under Shear Loads Strengthened with Metallic and Non-Metallic Fibers

Effect of steel fibers and the fiber-concrete adhesion stress on the nonlinear shear behavior of beams

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