Experimental study of concrete beams prestressed with basalt fiber reinforced polymers under cyclic load

Atutis, Edgaras; Valivonis, Juozas; Atutis, Mantas

doi:10.1016/j.compstruct.2017.03.106

Cited by 23 publications

(9 citation statements)

References 16 publications

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“…It should be noted that a large number of experimental studies show that the load-deflection curve of FRP reinforced concrete beams under bending is not an ideal linear relation, but presents certain non-linear characteristics, especially in the stage of large load [ 35 , 36 , 37 ]. This is because the bond between FRP bars and concrete gradually loses with the increase of load, and the inhomogeneity coefficient of FRP bars increases gradually.…”

Section: Existing Formula For Short Term Flexural Rigiditymentioning

confidence: 99%

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

et al. 2021

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FRP (Fiber Reinforced Polymer) Bar reinforced coral concrete beam is a new type of structural member that has been used more and more widely in marine engineering in recent years. In order to study and predict the flexural performance of CFRP reinforced coral concrete beams, the flexural rigidity, crack morphology and failure mode of concrete were studied in detail. The results show that under the condition of similar reinforcement ratio, the flexural rigidity of CFRP reinforced coral concrete beam is significantly lower than that of ordinary reinforced concrete beam. Increasing the cross-section reinforcement ratio within a certain range can increase the bending stiffness of the test beam or reduce the deflection, but the strength utilization rate of CFRP reinforcement is greatly reduced. The short-term bending stiffness of the CFRP reinforced coral concrete beam calculated by the existing standard formula is obviously higher. This paper proposes a modified formula for introducing the strain inhomogeneity coefficient (ψ) of CFRP bars and considers the relative slip between CFRP bars and coral concrete to predict the short-term flexural stiffness of coral concrete beams reinforced by CFRP bars. The formula was verified with the test results, and it was proved that the formula has a good consistency with the test results.

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Section: Existing Formula For Short Term Flexural Rigiditymentioning

confidence: 99%

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

et al. 2021

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“…They are light and easy to install (which leads to reduced labour cost), they are thin (aesthetic and design requirements) and more resistant to corrosion compared to steel (durability requirements), although the modulus of elasticity is similar to that of steel [1][2][3][4][5]. It is the modulus of elasticity that makes CFRP a much more suitable reinforcing material than others widely used in construction, such as glass fibre reinforced polymer (GFRP), aramid fibre reinforced polymer (AFRP) [4,6], and basalt fibre reinforced polymer (BFRP) [7][8][9][10][11] with much lower Young's Modulus.…”

Section: Introductionmentioning

confidence: 99%

“…The modulus of elasticity is particularly important in prestressing, which is a way to exploit the potential of these high-strength materials. The benefits of prestressing include, but are not limited to, the use of full-strength potential, reduced deflection, crack control, improved cracking, and steel reinforcement yield loads of retrofitted structures [3,[7][8][9][10]12]. Despite the benefits above, the glued laminate joint is partially rigid, resulting in slippage that leads to premature debonding and failure.…”

Section: Introductionmentioning

confidence: 99%

Anchoring Issues of CFRP Laminates to Concrete Members

2022

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In recent years, carbon fibre reinforced polymer (CFRP) laminates have conquered the structural rehabilitation market due to their ease and quick installation, high strength, anticorrosion properties, and other properties often repeated in the literature. The full potential of these high-strength elements can only be exploited by prestressing. However, the glued laminate joint is partially rigid, resulting in slippage that leads to premature debonding and failure. Therefore, anchoring of the laminate ends is required to stop or delay premature failure and/or perform prestressing. This article discusses the anchoring issues of CFRP laminates and guidelines for the development of anchoring systems. To achieve this goal, the laminate strip was bent, the required clamping forces were determined, possible cases of damage were identified, and individual stress concentrations were modelled. The methodology for calculating the anchor length and the pull-off force is also presented.

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“…Conventional steel tendons in prestressed concrete structures are naturally vulnerable to corrosion, which is exacerbated over time and may result in a decrease in structural stiffness, strength, and service life. The best solution to the corrosion problem is to use non-metallic reinforcements, such as fiber reinforced polymer (FRP) composites, which have high tensile strength and are non-corrosive, non-magnetic, and lightweight [1,2,3,4]. The FRP composites have been proposed as alternatives to steel tendons in prestressed concrete structures to overcome such deterioration problems.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Concrete Beams Prestressed with Partially Bonded CFRP Bars Subjected to Cyclic Loads

et al. 2019

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The lack of ductility is the greatest concern in the applications of carbon fiber reinforced polymer (CFRP) materials, when used as pre-stressing reinforcements. To improve the ductility, a partially bonded FRP system which is intentionally unbonded in the middle part of the beam and bonded in both end parts of the beam has been developed and applied to prestressed concrete beams. While, many researchers investigated the instantaneous performance of partially bonded CFRP prestressed concrete beams, this study intended to evaluate the fatigue performance, the static load-carrying capacity after fatigue loading and ductility. Based on the fatigue loading tests followed by static loading tests, over-reinforced and web-confined partially bonded CFRP prestressed concrete beams exhibited satisfactory fatigue performance without cracks and stiffness degradation during fatigue loading. In addition, no degradation of load-carrying capacity was observed in static loading tests after the fatigue tests. The ductility index of concrete beams, prestressed with partially bonded CFRP bars, is combined with over-reinforcements and web-confinements, similar to that of beams prestressed with steel bars.

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Experimental study of concrete beams prestressed with basalt fiber reinforced polymers under cyclic load

Cited by 23 publications

References 16 publications

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

Anchoring Issues of CFRP Laminates to Concrete Members

Fatigue Behavior of Concrete Beams Prestressed with Partially Bonded CFRP Bars Subjected to Cyclic Loads

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