Time-dependent deformation and cracking behaviour of FRC beams

Watts, Murray; Amin, Ali; Gilbert, Raymond Ian

doi:10.1016/j.engstruct.2022.114741

Cited by 6 publications

(5 citation statements)

References 33 publications

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“…The reduction in tension provided by the synthetic fibers is greater relative to steel fibers due to the greater deformability (reduced modulus) of synthetic fibers. This may suggest that an assumed constant residual tension provided by the fibers over a period of time requires further examination 28 …”

Section: Experimental Results and Model Validationmentioning

confidence: 99%

“…This may suggest that an assumed constant residual tension provided by the fibers over a period of time requires further examination. 28 In addition to the cracking behavior the LT elongation of the tension chord specimens was routinely monitored. The elongation of the ties was recorded through two dial gauges fixed to the opposing faces of each tension tie.…”

Section: Long-term Behavior Of Tension Tiesmentioning

confidence: 99%

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Time‐dependent elongation and cracking behavior of fiber reinforced concrete tension chords

Watts

Amin

Gilbert

2022

Structural Concrete

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The long-term (LT) tension stiffening effect in fiber reinforced concrete (FRC) tension chords is investigated in this paper. Six tension tie specimens with varying fiber types (either no fibers, polypropylene, or steel fibers) and reinforcement ratios were subjected to a sustained tensile in-service load for 560 days. The LT specimens were fitted with gauges to monitor their elongation over the test period. In addition, 12 specimens were subjected to instantaneous loading to capture the entire load-deformation response of the tension ties, up to and beyond the yielding of the reinforcement. A complete suite of material characterization tests were conducted in conjunction with the tension tie testing. The results from this investigation indicate that the inclusion of the fiber types and dosages adopted in this program improve the short-term performance with respect to stiffness, tension stiffening, and cracking. Steel fibers improved the LT behavior, while the polypropylene fibers used in this study led to mixed results. Models previously developed by the authors have been shown to describe the behavior with good accuracy.

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Section: Experimental Results and Model Validationmentioning

confidence: 99%

Section: Long-term Behavior Of Tension Tiesmentioning

confidence: 99%

Time‐dependent elongation and cracking behavior of fiber reinforced concrete tension chords

Watts

Amin

Gilbert

2022

Structural Concrete

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“…Since the 1970s, steel fiber reinforced concrete has been used in countries such as the United Kingdom, the United States, and Japan. After a development period of more than 50 years, fiber reinforced concrete (FRC) has been widely studied and applied [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Fiber-Reinforced Polymers and Fiber-Reinforced Concrete in Civil Engineering

Shi

2023

Buildings

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“…The tensile region of concrete is susceptible to cracking despite bar reinforcement, which compromises its durability. By incorporating discrete and random fibers into concrete to develop fiber-reinforced concrete (FRC), it becomes less brittle and less susceptible to damage from aggressive environments [ 2 , 3 , 4 , 5 , 6 ]. It is noteworthy that steel fibers are less susceptible to chloride corrosion than steel bar reinforcement; thus, they may be a better choice than steel bar reinforcement in chloride environments, and chloride salt attacks can accelerate the deterioration of concrete [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…According to their findings, the strain capacity and strain-hardening slope of DFRCC are not significantly correlated with the load-carrying capacity and displacement at failure. A further study was conducted by Hussein et al [ 5 ] to test the effectiveness of SHCC layers in strengthening RC beams over their soffit. By combining SHCC with small amounts of steel reinforcement, these scholars found that early strain localization was eliminated in the strengthening layer of the SHCC.…”

Section: Introductionmentioning

confidence: 99%

Behavioral Evaluation of Strengthened Reinforced Concrete Beams with Ultra-Ductile Fiber-Reinforced Cementitious Composite Layers

Khan

Abbas

2023

Materials

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In the literature, there is little information available regarding the behavior of composite beams made up of reinforced concrete (RC) and ultra-ductile fiber-reinforced concrete (UDFRC). In this study, UDFRC was examined for its effectiveness in enhancing the strength of RC beams. With a tensile strength of 4.35 MPa and a strain capacity of 2.5%, PVA-based UDFRC was prepared. The performance of 12 medium-sized reinforced concrete (RC) beams was measured under four-point flexural loading. The beams measured 1800 mm long, 150 mm wide, and 200–260 mm deep. The experimental program on beam specimens was divided into two phases. In the first, four 150 × 200 × 1800 mm RC beams with UDFRC layer thicknesses of 0, 30, 60, and 90 mm were tested. Additionally, four concrete and four concrete–UDFRC beams were investigated, measuring 150 × 230 × 1800 mm and 150 × 260 × 1800 mm, respectively. The study focused on medium-sized, slender RC beams under quasi-static loads and room temperature with additional or substituted UDFRC layers. As a result of replacing concrete with UDFRC, the load-carrying capacity at first crack and steel yield significantly increased between 18.4 and 43.1%, but the ultimate load-carrying capacity increased only in the range of 6.3–10.8%. Furthermore, beams with additional UDFRC layers could carry 30–50% more load than their concrete counterparts. An RC-UDFRC beam had a load-carrying capacity 10–15% greater than that of a comparable RC beam. Generally, there is a lower deflection response in UDFRC–concrete composite RC beams than in control concrete beams. The UDFRC layering can potentially improve the load-carrying capacity of RC beams, at least when ductility provisions are considered.

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Time-dependent deformation and cracking behaviour of FRC beams

Cited by 6 publications

References 33 publications

Time‐dependent elongation and cracking behavior of fiber reinforced concrete tension chords

Time‐dependent elongation and cracking behavior of fiber reinforced concrete tension chords

Fiber-Reinforced Polymers and Fiber-Reinforced Concrete in Civil Engineering

Behavioral Evaluation of Strengthened Reinforced Concrete Beams with Ultra-Ductile Fiber-Reinforced Cementitious Composite Layers

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