Effect of steel fibers on the flexural behavior of RC beams with very low reinforcement ratios

Yoo, Doo-Yeol; Moon, Do-Young

doi:10.1016/j.conbuildmat.2018.08.099

Cited by 86 publications

(36 citation statements)

References 23 publications

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“…This is attributed to the active bridging action of steel fiber during the load transferring along the crack, where these fibers arrest or slowdown the growth of the crack leading to the absorption of higher number of impact blows [7]. This is an expected positive action as fibers are known of their ability to improve the tensile strength of concrete via crack controlling leading to more ductile behavior under tensile, flexural and dynamic loads [59,60,61]. Figures 2 and 3 also show that regardless of fiber content, specimens exposed to higher drop-heights retained significantly lower number of blows at both first crack and failure stages.…”

Section: Results Of Compressive Strength Splitting Strength and Upvmentioning

confidence: 99%

“…Ductility is known as the ability of the material to withstand plastic deformations under loading, which is normally used with tensile and flexure tests [59,61]. However, this definition can be generalized to the repeated impact test as the ratio of number of impact blows at failure to that at cracking stage (ductility ratio).…”

Section: Failure Patters and Impact Ductilitymentioning

confidence: 99%

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Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Abid

Abdul-Hussein

Ayoob

et al. 2020

Heliyon

104

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A B S T R A C TSteel fiber has become a proven material that can significantly alter the behavior of different types of concrete mixtures from brittle to more ductile ones. Rich literature is currently available on the mechanical properties of steel fiber-reinforced self-compacting concrete. However, the investigation of the impact resistance of this material to drop weight is still required to enrich the knowledge about its behavior under different loading conditions. An experimental work was conducted in this research to evaluate the performance of steel fiber-reinforced self-compacting concrete under repeated impact loading using the repeated blows test recommended by ACI 544-2R. The tests investigated the effect of drop weight and drop height in addition to fiber content. Straight microsteel fibers were incorporated in three volumetric contents of 0.5, 0.75 and 1.0% and were compared with a similar plain mixture. The test equipment was adjusted to conduct repeated impact loading from different dropheights and using different drop-weights. The adopted drop-heights were 450, 575 and 700 mm, while the adopted drop-weights were 4.5, 6.0 and 7.5 kg. The combination of the adopted drop-heights and weights composes four loading cases in addition to the standard loading case with a drop-weight and drop-height of 4.5 kg and 450 mm. The inclusion of micro steel fiber was found to significantly increase the impact resistance of selfcompacting concrete with percentage developments ranging from 150 to 860% compared to plain samples. The specimens tested under 4.5 kg and 450 mm drop weight and height exhibited the highest percentage improvement in impact resistance among the five loading cases. The results also showed that the impact ductility of fibrous specimens was up to 24% higher than that of plain specimens.

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Section: Results Of Compressive Strength Splitting Strength and Upvmentioning

confidence: 99%

Section: Failure Patters and Impact Ductilitymentioning

confidence: 99%

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Abid

Abdul-Hussein

Ayoob

et al. 2020

Heliyon

104

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“…The flexural model presented in Section 4 is compared to 4-point bending tests conducted by Pfyl and Marti 2001, Dancygier and Berkover 2016, Mertol et al 2015and Yoo and Moon 2018. Table 2 summarizes the specimen properties and assumed values used in the analyses (if any).…”

Section: Sfrc Flexural Beamsmentioning

confidence: 99%

Strength and Deformation Capacity of Tension and Flexural RC Members Containing Steel Fibers

et al. 2020

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A misnomer exists within the literature on the topic of ductility (deformation capacity) in steel fibre reinforced concrete (SFRC) members subjected to flexure. Several studies report that the addition of fibres to reinforced concrete beams subjected to flexure increases the deformation capacity of the members. This can be true for normally longitudinally reinforced concrete beams; however, a few studies have shown this not to be the case, particularly for lightly reinforced concrete members containing even low amounts of steel fibres. It has been observed that failure may occur at far lower deformations in structural concrete members containing steel fibres than without the fibres. This paper presents a system of rational and mechanically consistent expressions capable of predicting the entire load-deformation relationship for SFRC tension and one-way flexural members. The model is also capable of determining whether the addition of fibres to the reinforced concrete member may lead to a failure mode governed by rupture of the longitudinal reinforcing bars or crushing of the concrete.

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“…However, to define the flexural toughness indexes in bending, e.g., I30 and I100, the deflection value at cracking should be multiplied by 15.5 and 50.5, respectively. There are many proposals for the definition of the above mentioned parameters of bent small beams [2][3][4][5][6], but they do not apply to the description of the deflection of bend tested steel fiber reinforced concrete beams with bar reinforcement, because the steel bars considerably influence the load-deflection curve's character [7].…”

Section: Introductionmentioning

confidence: 99%

Deflection of Steel Fiber Reinforced Concrete Beams Based on Waste Sand

Domski

Zakrzewski

2020

Materials

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The article describes the selected methods of calculating the deflection of steel fiber reinforced concrete beams. Additionally, the results of the study on the deflection of steel fiber reinforced concrete beams based on waste sand are presented. This paper compares deflections measured during the four point bending test of the steel fiber reinforced, waste sand fine aggregate concrete beam with values determined in accordance with Eurocode 2, the proposal of Tan, Paramasivam, and Tan, the modified method of Alsayed, Bywalski, and Kaminski, and Amin, Foster, and Kaufmann’s method. The analysis conducted shows that the best accordance with the study and calculation results was obtained by using the modified Alsayed method.

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Effect of steel fibers on the flexural behavior of RC beams with very low reinforcement ratios

Cited by 86 publications

References 23 publications

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Strength and Deformation Capacity of Tension and Flexural RC Members Containing Steel Fibers

Deflection of Steel Fiber Reinforced Concrete Beams Based on Waste Sand

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