Comparison of the behavior of GFRP reinforced concrete beams with conventional steel bars

Krasniqi, Cene; Kabashi, Naser; Krasniqi, Enes; Kaqi, Vlorian

doi:10.1556/606.2018.13.3.14

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…Furthermore, due to their linearly elastic stress-strain relationship up to failure, GFRP reinforcing bars react differently from typical steel reinforcing bars. Furthermore, as compared to steel-reinforced concrete members, the lower modulus of elasticity of GFRP reinforcing bars produces a significant drop in flexural stiffness of GFRP-RC members after cracking and, as a result, greater deflection/deformations under service or loading circumstances [17,18].…”

Section: Introductionmentioning

confidence: 99%

Crack Classification in Steel-RC and GFRP-RC Beams with Varying Reinforcement Ratio Using AE Parameters

Sharma¹,

Sharma²,

Sharma³

2022

Acoustic Emission - New Perspectives and Applications

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The main aim of this chapter is to monitor the cracking and damage assessment in steel-reinforced concrete (steel-RC) and glass fibre polymer-reinforced concrete (GFRP-RC) beams along with varying percentages of tension reinforcement ratio. Beam specimens measuring (150 × 230 × 2100) mm were tested using a four-point bending flexural test using a universal testing machine together with an AE monitoring system. Acoustic emission (AE) has been applied for the early monitoring of steel-RC and GFRP-RC structures using AE parameters such as cumulative AE hits, average frequency, rise angle, amplitude, duration and AE XY plots to evaluate the micro and macro cracking in the steel-RC and GFRP-RC beams specimens. The most popular applications of AE signal in structural health monitoring are specified on crack monitoring, quantifying the degree of damage, and crack classification. In this research, the results indicated that the average frequency and rise angle parameter of AE signal are applied to classify the types of cracks (flexural or shear cracks) that occur in steel-RC and GFRP-RC beams along with varying percentages of tension reinforcement ratio subjected to flexural loading. As a result of these findings, the AE approach may be used to examine crack monitoring and crack classification in steel and GFRP-RC beams with different percentages of tension reinforcement ratios.

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Section: Introductionmentioning

confidence: 99%

Crack Classification in Steel-RC and GFRP-RC Beams with Varying Reinforcement Ratio Using AE Parameters

Sharma¹,

Sharma²,

Sharma³

2022

Acoustic Emission - New Perspectives and Applications

View full text Add to dashboard Cite

show abstract

“…GFRP-RC beams have been reported to exhibit higher load-carrying capacity, higher crack width, and deflections as compared to steel-RC beams. [16][17][18][19][20] Due to the relatively lower modulus of elasticity of GFRP bars as compared to steel, GFRP reinforced beams exhibit linear-elastic behavior up to failure, unlike steel-RC beams which undergo noticeable yielding before failure. [16][17][18] Due to lack of ductility, the margin of safety factor for the design of GFRP-RC flexural member is much higher than that for steel-RC flexural members.…”

Section: Introductionmentioning

confidence: 99%

Fracture monitoring of steel and GFRP reinforced concrete beams using acoustic emission and digital image correlation techniques

Sharma

2021

Structural Concrete

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In this work, fracture monitoring of steel and GFRP bars reinforced concrete beams in flexure is investigated by using non-destructive acoustic emission (AE) and digital image correlation (DIC) techniques. The combined methodology provides complementary information from 'the ear' aided by the AE and from 'the eye' aided by the DIC. AE waveform parameters of the number of AE hits and their amplitudes, cumulative signal strength (CSS), average frequency, and rise-time successfully pick-up the divergent cracking initiation and fracture progression in steel-reinforced concrete (RC) and GFRP-RC beams. AE-XY plots and longitudinal strain profiles obtained from DIC give an early, online, and real-time representation of progressive AE activity and strains inside concrete much before it is visible to the naked eye. AE in conjunction with DIC was able to efficaciously depict the micro-and-macro cracks evolution and their advancement in steel-RC and GFRP-RC at various stages of loading Moreover, DIC identified critical damage areas as a function of loading periods, while AE was capable of monitoring the damage process and revealed changes in the overall behavior. It is successfully demonstrated that combined AE and DIC monitoring can enhance non-destructive monitoring skills in RC structures involving widely different steel and GFRP bars as reinforcements and depict efficaciously their fracture/cracking behavior.

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“…The noncorrosive properties and the high strength-to-weight ratio of FRP reinforcement provide a perfect solution for optimized structures in aggressive environments. However, a drawback is its low modulus of elasticity compared to steel which results in early concrete cracking at lower service loads [1], as well as the lack of failure ductility in the flexural elements. Therefore, in order to compensate for the sudden failure of FRP-reinforced elements, very conservative safety factors -compared to those used for steel reinforced sectionsare adopted in the design process.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Controlling the failure behavior of FRP-reinforced concrete elements

Sakr

Orbán

2021

Pollack

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Concrete indeterminate flexural members represented by continuous beams reinforced with both fiber-reinforced polymers and steel bars in a way that allows for moment redistribution at failure are analyzed. The efficiency of introducing steel bars in the critical sections where plastic hinges are likely to form is evaluated in terms of reliability. Monte Carlo simulation and the concept of comparative reliability are both employed. Ultimately, the effect of different design parameters on the strength reduction factor is evaluated.

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Comparison of the behavior of GFRP reinforced concrete beams with conventional steel bars

Cited by 8 publications

References 9 publications

Crack Classification in Steel-RC and GFRP-RC Beams with Varying Reinforcement Ratio Using AE Parameters

Crack Classification in Steel-RC and GFRP-RC Beams with Varying Reinforcement Ratio Using AE Parameters

Fracture monitoring of steel and GFRP reinforced concrete beams using acoustic emission and digital image correlation techniques

Controlling the failure behavior of FRP-reinforced concrete elements

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