The orientation effect of opening and internal strengthening on shear performance of deep concrete beam using recycled tyre steel fibres

Augustino, Daudi Salezi; Kabubo, Charles; Kanali, Christopher; Onchiri, Richard Ocharo

doi:10.1016/j.rineng.2022.100561

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…Materials used in the deep concrete beam are based on an experimental setup by Ref. [ 6 ]. The shrinkage test was conducted using recycled tyre steel fibres with and without grips.…”

Section: Methodsmentioning

confidence: 99%

“…The shear in the beam is reduced with the presence of openings in shear zones [ 6 ]. Consider the similarity between areas and shear forces transferred as in Eq.…”

Section: Methodsmentioning

confidence: 99%

“…The fibre-reinforced concrete under tension has a promising shear response of concrete structural members which is brought by its tensile response. So, fibres have been proved as a promising non-conventional reinforcement in concrete structural elements under shear stresses due to the beneficial cracking performance of fibre-reinforced concrete that could change the brittle shear failures to more ductile and prolonged failures [ [6] , [7] , [8] ]. In cyclic loads, repeated loading reduces the interlocking of aggregates that weaken the compressive behaviour of structural elements under compression.…”

Section: Introductionmentioning

confidence: 99%

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Simplified shear equation of deep concrete beam considering orientation effect of opening and mechanical properties of fibre-concrete interface

Augustino¹,

Kanali²,

Onchiri³

et al. 2023

Heliyon

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“…Materials used in the deep concrete beam are based on an experimental setup by Ref. [ 6 ]. The shrinkage test was conducted using recycled tyre steel fibres with and without grips.…”

Section: Methodsmentioning

confidence: 99%

“…The shear in the beam is reduced with the presence of openings in shear zones [ 6 ]. Consider the similarity between areas and shear forces transferred as in Eq.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simplified shear equation of deep concrete beam considering orientation effect of opening and mechanical properties of fibre-concrete interface

Augustino¹,

Kanali²,

Onchiri³

et al. 2023

Heliyon

Self Cite

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“…In 2022, (Gemi et al, 2022), observed that GFRP and CFRP increased the initial stiffness with a full wrapping effect of 44.2% and 65.4%, respectively. In structural concrete members such as beams, the introduction of an opening tremendously affects the shear capacity, which steel rebar alone cannot restore (Augustino et al, 2022a). Restoring this capacity through external strength is limited by the type of opening.…”

Section: Introductionmentioning

confidence: 99%

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

et al. 2023

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In the present era of architecture, different cross-sectional shapes of structural concrete elements have been utilized. However, this change in shape has a significant effect on load-carrying capacity. To restore this, the use of column confinements with elliptical sections has gained attention. This paper aim to investigate the effect of elliptical shape sections of confined concrete reinforced with Carbon Fiber Reinforced Polymer (CFRP) and steel tube on axial load-carrying capacity. This study is achieved using following tools Finite Element (FE) in Abaqus and Artificial Neural Networks (ANN) modeling. The study involved a 500-mm-high column with three sets of aspect ratios: 1.0, 1.5, and 2.0. In each aspect ratio, three different layers of CFRP were used, i.e., .167, .334, and .501-mm. Analytical results showed that with the increase in aspect ratio from 1 to 2, there is a decrease in ultimate axial load of about 23.2% on average. In addition, the combined confining pressure of steel tube and CFRP increases with a decrease in dilation angle as the number of CFRP layers increases. The failure mode for the column with a large aspect ratio is local buckling at its mid-height along the minor axis. The result showed a good correlation between FE and experimental results of ultimate stress and strains, with a mean squared error of 2.27 and .001, respectively. Moreover, ANN and analytical models showed a delightful correlation of R2 of .97 for stress models and .88 for strain models, respectively. The elliptical concrete section of the column confined with steel tubes can be adopted for a new architectural type of construction; however, with more than three aspect ratios, the wrapping of the section with CFRP jackets is highly recommended.

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“…With the state of the economy of used tires at present, there remains a problem related to the rational management of waste, which is steel fiber. The search for an alternative product in the form of steel cord obtained from recycled tires and the study of its impact on the properties of the composite are necessary in the research [ 22 , 23 , 24 ]. The research conducted on steel cord fatigue was already performed and the results are promising.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

et al. 2023

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This study presents the results of laboratory experiments conducted to determine the mechanical parameters for cement mortar with various quantities of waste fibers, polypropylene microfibers, and steel microfibers. Waste fibers were used as samples and obtained using an end-of-life car tire recycling process. For comparison, samples with the addition of steel and polypropylene microfibers were tested. The same degrees of fiber reinforcement were used for all types of fibers. Ultimately, 22 mixtures of cement mortar were prepared. The aim of this study is therefore to present and compare basic mechanical parameter values. Compressive strength, flexural strength, fracture toughness, and flexural toughness were of particular interest. A three-point bending test was performed on three types of samples, without a notch and with a notch of 4 and 8 mm. The results show that the use of steel microfibers in the cement mortar produces a product with better properties compared to a mixture with steel cord or polypropylene fibers. However, the cement mortar with the steel cord provides better flexural strength and greater flexural toughness factors compared to the cement mortar with polypropylene fibers. This means that the steel cord is a full-value ecological replacement for different fibers.

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The orientation effect of opening and internal strengthening on shear performance of deep concrete beam using recycled tyre steel fibres

Cited by 8 publications

References 20 publications

Simplified shear equation of deep concrete beam considering orientation effect of opening and mechanical properties of fibre-concrete interface

Simplified shear equation of deep concrete beam considering orientation effect of opening and mechanical properties of fibre-concrete interface

Finite element, analytical, artificial neural network models for carbon fibre reinforced polymer confined concrete filled steel columns with elliptical cross sections

Comparative Analysis of Waste, Steel, and Polypropylene Microfibers as an Additive for Cement Mortar

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