Effect of macro-synthetic structural fibers on the flexural behavior of concrete beams reinforced with different ratios of GFRP bars

Chellapandian, M.; Mani, A.; Prakash, S. Suriya

doi:10.1016/j.compstruct.2020.112790

Cited by 32 publications

(7 citation statements)

References 27 publications

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“…However, the linear elastic stress–strain nature of FRP bars means that the design of FRP-RC members requires special attention to be paid to the serviceability issues, such as larger deflections, wider cracks widths, and reduced ductility [ 31 , 32 , 33 ]. Moreover, the low elastic modulus of FRP bars causes an abrupt drop in stiffness when the concrete cracks, which seriously affects the post-cracking performance of structures [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of Concrete Beams Reinforced with Continuous FRP Bars and Discrete Steel Fibers under Cyclic Loads

Zhu

Cheng

et al. 2022

Polymers

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This research investigated the flexural behavior of high-strength concrete beams reinforced with continuous basalt fiber-reinforced polymer (BFRP) bars and discrete steel fibers. Five concrete beams with the dimensions of 150 × 300 × 2100 mm3 were constructed and tested to failure under four-point bending cyclic loading. The specimens consisted of four BFRP-reinforced concrete beams with various reinforcement ratios (ρf), namely, 0.56%, 0.77%, 1.15%, and 1.65%, and one conventional steel-reinforced concrete beam for comparison purposes. The cracking behavior, failure modes, load-deflection behavior, residual deformation, and stiffness degradation of the beams were studied. Additionally, a deformation-based approach was used to analyze the deformability of the beams. The results show that an increase in the ρf effectively restrained the crack widths, deflections, and residual deformation while also enhancing the flexural bearing capacity of the beams. In comparison to the first displacement cycle, the bearing capacity dropped by 10% on average in the third cycle. The stiffness exhibited a fast to slow degradation trend until failure. The residual stiffnesses were higher in beams with a higher ρf. The over-reinforced beams had superior deformability than the under-reinforced beams, according to the deformability factors.

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Section: Introductionmentioning

confidence: 99%

Flexural Performance of Concrete Beams Reinforced with Continuous FRP Bars and Discrete Steel Fibers under Cyclic Loads

Zhu

Cheng

et al. 2022

Polymers

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“…The sudden loss of flexural stiffness experienced by the GFRP-reinforced concrete beams following the cracking of concrete has a substantial impact on the post-cracking performance and deformability [36,37]. The sudden loss of concrete stiffness can be attributed to the low elastic modulus of GFRP bars [36][37][38][39][40]. High-strength concrete optimizes the utilization of the high-strength properties of GFRP bars and improves the flexural stiffness of the cracked sections.…”

Section: Introductionmentioning

confidence: 99%

Effects of GFRP Stirrup Spacing on the Behavior of Doubly GFRP-Reinforced Concrete Beams

AbdulMuttalib Issa,

Allawi,

Oukaili

2024

Civ Eng J

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This study investigates the impact of varying glass fiber-reinforced polymer (GFRP) stirrup spacing on the performance of doubly GFRP-reinforced concrete beams. The research focuses on assessing the behavior of GFRP-reinforced concrete beams, including load-carrying capacity, cracking, and deformability. It explores the feasibility and effectiveness of GFRP bars as an alternative to traditional steel reinforcement in concrete structures. Six concrete beams with a cross-section of 300 mm (wide) × 250 mm (deep), simply supported on a 2100 mm span, were tested. The beams underwent four-point bending with two concentrated loads applied symmetrically at one-third of the span length, resulting in a shear span (a)-to-depth (h) ratio of 2.8. The experimental findings reveal that altering the GFRP stirrup spacing along the longitudinal axis of the beams, from 200 mm (equivalent to the effective depth (d)) to 50 mm (equal to (d⁄4)), altered the mode of failure from flexure-shear to flexure-compression. However, when the spacing was equal to or less than (d⁄3), there was no significant improvement in load-carrying capacity, as the contribution of GFRP bars in resisting shear loads was limited. Under service loads, the GFRP-reinforced beams exhibited wider cracks, but reducing the stirrup spacing helped restrain crack widening. Incorporating GFRP bars in the compression zone had a positive effect on reducing crack width in the tension zone. Additionally, using GFRP stirrups with spacing varying between (d) and (d⁄2) in the pure bending region increased the deflection ductility indexes. To enhance the ductility of GFRP-reinforced concrete beams, it is recommended to use GFRP stirrups in the pure bending region with spacing greater than the spacing between GFRP stirrups in the shear spans. The study highlights that the current ACI code overestimates the shear capacity provided by GFRP stirrups, particularly when the spacing is less than or equal to (d⁄3). Doi: 10.28991/CEJ-2024-010-02-011 Full Text: PDF

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“…The addition of fibers reduces the compressive strength [10]. The addition of POFs to a concrete beam remarkably improves its strength after cracking by increasing its elastic modulus [11]. The Crack Mouth Opening Displacement (CMOD) analysis has also indicated that the POFs have proper bonding properties and, due to their proper stiffness, they can keep the concrete pieces beside each other after the initial cracking [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Properties and Microstructure of Pozzolanic Geopolymer Concrete Reinforced with Polymer Fiber

Mansourghanaei

2023

jcer

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In recent decades, Geopolymer concrete (GPC) is a new material in the construction industry, which has favorable performance and workability and contains aluminosilicate materials full of silicate (Si), aluminum (Al), and alkaline solution as a binder. The advantages of using geopolymer materials instead of cement in concrete are not limited to high mechanical and microstructural properties. It also has a remarkable effect in reducing greenhouse gas emissions. In the current study, Granulated Blast Furnace Slag (GBFS) GPC was used with 0-2% polyolefin fibers (POFs) and 0-8% nano-silica (NS) to improve its structure. After curing the specimens under dry conditions at a temperature of 60 °C in an oven, they were subjected to compressive strength, tensile strength, elastic modulus, ultrasonic pulse velocity (UPV) and impact resistance tests to evaluate their mechanical properties. The addition of NS enhanced the whole properties of the GBFS geopolymer concrete. The compressive strength, tensile strength, and elastic modulus of the concrete increased by up to 22%, 14%, and 24%, respectively. Besides, it leads to ultrasonic wave velocity enhancement to 12% in the room temperature. The addition of the fibers to the GPC significantly increased the tensile strength (by up to 9%) and the energy absorbed due to the impact. Moreover, compared to Concrete containing ordinary portland cement (OPC), the GPC demonstrated much better mechanical and microstructural properties. Besides, the presence of POFs in the GPC compound substantially affects tensile strength and resistance against an impact. Accordingly, the sample’s tensile strength had an improvement by 8.4% in the room temperature. In the following, by conducting the X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Scanning electron microscope (SEM) tests, a microstructure investigation was carried out on the concrete samples. In addition to their overlapping with each other, the results indicate the GPC superiority over the regular concrete.

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Effect of macro-synthetic structural fibers on the flexural behavior of concrete beams reinforced with different ratios of GFRP bars

Cited by 32 publications

References 27 publications

Flexural Performance of Concrete Beams Reinforced with Continuous FRP Bars and Discrete Steel Fibers under Cyclic Loads

Flexural Performance of Concrete Beams Reinforced with Continuous FRP Bars and Discrete Steel Fibers under Cyclic Loads

Effects of GFRP Stirrup Spacing on the Behavior of Doubly GFRP-Reinforced Concrete Beams

Evaluation of Mechanical Properties and Microstructure of Pozzolanic Geopolymer Concrete Reinforced with Polymer Fiber

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