Flexural Behavior and Cracks in Concrete Beams Reinforced with GFRP Bars

Kabashi, Naser; Krasniqi, Cene; Šušteršič, Jakob; Dautaj, Arton; Krasniqi, Enes; Morina, Hysni

doi:10.1007/978-3-319-78175-4_79

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…Each reinforced beam specimen contains two reinforcing bars placed on a single layer placed in the bottom and two identical bars (ɸ6 conventional steel) were placed as top reinforcement for each specimen (undetermined the behavior of FRP bars in compression section). The cross-section geometry and several of reinforcing bars were chosen to represent various reinforcement conditions (under reinforcement, balanced, and over reinforcement) [16][17][18]. The specimen geometry and loading conditions are presented in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

et al. 2021

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There are several reasons why civil and structural engineers should use Fiber Reinforced Polymer bars in concrete. The primary reason is durability, and other relevant parameters, high strength and, lightweight. Non-corrosive attributes make their use particularly suitable in different situations. Due to low elastic modulus and poor bonding, the use of Fiber Reinforced Polymer results in larger crack widths under serviceability limit state especially beams reinforced with glass fiber bars. The study purpose of this paper is to investigate the kb values. The methodology of this paper is comparing the analytical and experimental results. The investigation included 12 beams, using the four-point load test. The geometrical parameters of tested beams with dimensions: 130×220×2200 mm, reinforced with different diameters, helically-grooved glass fiber bars, and sand-coated carbon fiber bars. The measured cracks were used to assess the current kb values recommended in the design codes and guides. The findings did not support the use of the same kb value for different bars because, in addition to the type of bar, the value of kb is also affected by the type of surface and the diameter of the bar. What is observed based on results shows that CFRP bars have a more constant value depending on the diameter, while GFRP bars have large value changes depending on the diameter. Doi: 10.28991/cej-2021-03091722 Full Text: PDF

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Section: Methodsmentioning

confidence: 99%

Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

et al. 2021

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“…The Eurocode 2 crack width equation is strain-based and can be adopted directly for the crack width of FRPreinforced concrete members [6], [14][15]. Calibration is done through bond parameter β1 and via parameter β2 for longterm stress.…”

Section: Methodsmentioning

confidence: 99%

“…The standard linear elastic approach using a constant effective moment of inertia yields very stiff behavior for FRP RC members [2], [14][15]. ACI 440.1R-06 modifies the model for evaluation of an effective moment of inertia, also including βb as the bond coefficient.…”

Section: Methodsmentioning

confidence: 99%

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Comparative Approach to Flexural Behavior of Reinforced Beams with GFRP, CFRP, and Steel Bars

et al. 2020

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The replacement of conventional steel bars with GFRP or CFRP is one of the main topics discussed in this paper, including the main parameters and properties of the materials. The design procedures should account for the properties and will focus on the tensile strength and modulus of elasticity. It will also consider corrosion under environmentally aggressive conditions. This paper presents an experiment on the flexural behavior of concrete beams reinforced with GFRP and CFRP bars and compares these results with theoretical analysis based on different standards such as ACI, Eurocode, and CSA. Twelve reinforced concrete beams will be tested using four-point loading. The geometrical parameters of the tested beams are 130×220×2200 mm, reinforced with different diameters for GFRP and CFRP. The reinforcement ratio and strength of concrete influence the behavior of GFRP, CFRP, and RC beams and contribute to reduce the deflection and crack width. Based on this research, the closest approximation of the experimental results is observed with ACI standards. At this stage, these bars can be used in structures without strict requirements for exceeding the Serviceability Limit State. The non-integration of tension stiffening and regression performance of cracking moment in prediction expressions imposed the differences from experimental results.

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“…The design of beams reinforced with GFRP is typically governed by serviceability requirements (deflection and crack width), which emphasize the bond behaviour of GFRP bar in concrete as the main parameter in design, because bond controls the cracking behaviour [7,8]. Beams reinforced with GFRP bars reveal excessive crack widths [9,10] and, for that purpose, three sets of identical beams (in terms of geometry and bar reinforcement) were tested in order to improve understanding of the fibre addition effect (plain concrete vs FRC). The cracking responses of specimens were studied to clarify improvements that may result from addition of fibres as reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Pukotine od savijanja u gredama od betona ojačanog vlaknima s armaturnim šipkama od vlaknima ojačanog polimera

Krasniqi¹,

Damjanović²,

Kabashi³

2019

6th Symposium on Doctoral Studies in Civil Engineering

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There are several reasons why civil and structural engineers may need to use FRP reinforcement (fibre reinforced polymer) in concrete. The primary reason is durability, but other reasons include electromagnetic neutrality, high strength, and lightweight. The use of fibre-reinforced polymer composites, as replacement for steel reinforcement in concrete structures, is a widespread practice in many countries. The unique characteristic of FRP as a material not susceptible to corrosion makes it particularly suitable in a variety of situations. Due to generally low elastic modulus and poor bond, the use of FRP results in larger crack widths, especially when beams are reinforced with GFRP bars. The aim of this research is to use fibre-reinforced concrete (FRC) in order to reduce crack widths. The paper provides results for 16 beams (three samples per set for GFRP and two samples per set for steel reinforcement) tested under four point bending. Based on the applied methodology, the existing codes are reviewed, compared and modified, so as to enable their calibration in accordance with appropriate results.

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Flexural Behavior and Cracks in Concrete Beams Reinforced with GFRP Bars

Cited by 6 publications

References 4 publications

Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

Bond Coefficient kb of Concrete Beams Reinforced with GFRP, CFRP, and Steel Bars

Comparative Approach to Flexural Behavior of Reinforced Beams with GFRP, CFRP, and Steel Bars

Pukotine od savijanja u gredama od betona ojačanog vlaknima s armaturnim šipkama od vlaknima ojačanog polimera

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