Steel fibers for replacing minimum reinforcement in beams under torsion

Facconi, Luca; Minelli, Fausto; Ceresa, Paola; Plizzari, Giovanni

doi:10.1617/s11527-021-01615-y

Cited by 21 publications

(29 citation statements)

References 28 publications

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“…With this material, one can produce elements in almost every shape, with sufficient durability and improved mechanical characteristics (e.g., [ 7 , 8 , 9 , 10 , 11 ]). Principal applications of SFRC include industrial floorings, structures in seismic zones or underground construction and applications where structures are exposed to torsion, impact or fatigue (e.g., [ 12 , 13 , 14 ]). One disadvantage of this type of construction material is the huge influence of fibre content, distribution and orientation on its mechanic properties (e.g., [ 15 , 16 , 17 , 18 , 19 ]).…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters

2021

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This paper presents a systematic study of the electrical resistivity of different steel fibre-reinforced concretes with fibre contents from 0 kg/m3 to 80 kg/m3 in order to identify possible effects of interactions among concrete composition and fibre type and content regarding electrical resistivity. Based on a literature review, four parameters, w/c ratio, binder content, ground granulated blast-furnace slag (GGBS) and fineness of cement, which show a significant influence on the electrical resistivity of plain concrete, were identified, and their influence on the electrical resistivity as well as interaction effects were investigated. The results of the experiments highlight that the addition of fibres leads to a significant decrease in electrical resistivity, independent of all additional parameters of the concrete composition. Additionally, it was shown that a higher porosity of the concrete, e.g., due to a higher w/c ratio, also results in a lower electrical resistivity. These results are in agreement with the literature review on plain concrete, while the influence of the concrete composition on the electrical resistivity is weaker with the increase in fibre content. The influence of fibre reinforcement is thus not affected by changes in the concrete composition. In general, a higher fibre dosage leads to a decrease in electrical resistivity, but the impact on the electrical resistivity varies slightly with different types of steel fibres. Based on this study, the potential of determining the fibre content using electrical resistivity measurements could be clearly presented.

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Section: Introductionmentioning

confidence: 99%

Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters

2021

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“…3. The experimental setup for torsion tests is a commonly used in literature [15,31,32]. The load was applied through a diagonal placed steel spreader beam.…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, the addition of 30 kg/m 3 and 60 kg/m 3 of steel fiber increased the θ u value by 20% and 118.8%, respectively, relative to the reference sample. The researchers reported that the addition of steel fiber contributed significantly in the increase the maximum resisting torque and maximum twist of RC beams under purer torsion[31,32,36]. The addition of steel fiber also increased torsional moment at cracking (T cr ) and the angle of twist per unit length at cracking (θ cr ).…”

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confidence: 99%

The Torsional and Shear Behavior of Steel Fiber Reinforced RC Members

Aydın

Kılıç

Maali

et al. 2021

Architecture, Civil Engineering, Environment

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Concrete is widely used structural material, all over the world. The excellent versatility, availability, and economy of the concrete makes it a pioneer of the construction industry when it is compared to other materials. Beams/columns are one of the main structural elements of building to respond to the effects, such as bending moment, shear, and torsion. Thus, it is important to investigate the relevant behaviors of members [1,2]. Steel fibers have been used to improve the characteristic properties of concrete in practice for many years. Besides the commercial use of fibers in concrete technology began in 1970s, particularly in Europe, Japan, and USA. In the structural application, concrete behaves as a brittle material with low tensile strain capacity and with some softening postpeak behavior in compression essentially due to the transverse strain capacity. The use of steel fibers in the

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“…Equilibrium of the shearing stresses along the sections equivalent hollow tube (see Figure 1c) requires

T goodbreak= 2 {qA}_{o},

where A o is the area enclosed by the centerline of the shear flow path and is taken as

A_{o} = ((), b - t_{c}) ((), h - t_{c})

refer to Figure 1c. Testing by Amin and Bentz 9 and Facconi et al 10,11 highlighted the benefits of fibers in preventing cover spalling in FRC members subjected to torsion. Therefore, unlike space truss models for plain RC, which wholly or partially discount the concrete cover in resisting the applied torsion, T , 12 in this article, we assume the thickness of the equivalent hollow tube section, t c in FRC members as

t_{c} goodbreak= 0.75 \frac{A_{g}}{p},

where A g = bh is the gross area of the concrete section and p = 2( b + h ) is the perimeter of the gross concrete cross section 13…”

Section: Analytical Modelingmentioning

confidence: 99%

A unified approach for determining the strength of FRC beams subjected to torsion–Part II: Analytical modeling

Facconi

Amin

Minelli

et al. 2021

Structural Concrete

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The addition of fibers to structural concrete is an accepted means in academia and practice to traverse tension across cracks. Several international codes of practice contain provisions, which allow a designer to rely on the fibers to resist flexure and shear. However, despite the wider community appreciating that the presence of fibers can significantly increase the capacity of reinforced concrete in resisting torsion, design guidelines are currently unavailable to the practicing engineer. As a result of minimum reinforcement requirements prescribed by codes to prevent excessive torsional cracking in reinforced concrete, a significant underutilization of the fibers is often encountered and this can lead to costly and exorbitant designs. In the accompanying paper, benchmark experimental data were presented on 18 large‐scale fiber‐reinforced concrete (FRC) members subjected to torsion, which clearly identified the beneficial effects of the fibers at all stages of loading. In this study, simplified and advanced mechanically consistent analytical models are developed within the so‐called level of approximation approach (within the framework of current Model Code) to describe the strength of FRC beams loaded in torsion.

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Steel fibers for replacing minimum reinforcement in beams under torsion

Cited by 21 publications

References 28 publications

Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters

Electrical Resistivity of Steel Fibre-Reinforced Concrete—Influencing Parameters

The Torsional and Shear Behavior of Steel Fiber Reinforced RC Members

A unified approach for determining the strength of FRC beams subjected to torsion–Part II: Analytical modeling

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