Anchorage systems for reinforced concrete structures strengthened with fiber-reinforced polymer composites: State-of-the-art review

Wang, Qiang; Zhu, Hong; Zhang, Bai; Tong, Yixuan; Teng, Fei; Su, Weiqiang

doi:10.1177/0731684420905010

Cited by 40 publications

(8 citation statements)

References 99 publications

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“…In accordance with previous research, fan anchors have been found as a highly efficient solution for anchoring FRPconcrete joints (Q. Wang et al, 2020).…”

Section: Introductionsupporting

confidence: 88%

Effectiveness of Fan Anchors in Preventing Debonding in FRP-Strengthened Steel Members

Esmaeeli

Shadan

2022

Int J Steel Struct

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Fibre Reinforced Polymers (FRPs) are extensively employed to strengthen existing structures because of their several advantages over other strengthening techniques. On the other hand, the premature debonding of FRP reduces its effectiveness in strengthening steel structures. Anchoring FRP composites is an effective solution to delay or even prevent their debonding. Very limited anchorage methods, however, have been introduced for FRP-strengthened steel structures and the need for an effective anchorage system remains. Fan anchor has been validated as one of the remedies against debonding failure in FRP-strengthened concrete structures. Considering the advantages that fan anchors offer, the use of fan anchors for FRP-strengthened steel structures is proposed and evaluated in this paper. Since FRP-steel joints have a different bond-slip law than FRP-concrete joints and the strengthened steel members are prone to buckling-debonding interactions, this study focuses on the efficiency of fan anchors in delaying FRP debonding by assuming that an adequate mechanical connection between the dowel and the steel substrate is provided. Three experimental studies involving shear, flexural and buckling strengthening of steel components were simulated through finite element modelling, and fan anchors were added to the models after validation. The effect of fan anchors on strength, failure mode and FRP's strain distribution of the models was examined. The study showed that the fan anchor was successfully able to delay debonding mode, which increased the strength and ductility and exploited a higher strain capacity of FRP plates.

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“…In accordance with previous research, fan anchors have been found as a highly efficient solution for anchoring FRPconcrete joints (Q. Wang et al, 2020).…”

Section: Introductionsupporting

confidence: 88%

Effectiveness of Fan Anchors in Preventing Debonding in FRP-Strengthened Steel Members

Esmaeeli

Shadan

2022

Int J Steel Struct

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“…This approach, however, does not exist in un-grooved tendons due to the lack of connection between both the strands and the surrounding concrete. As a result, unbonded strands, adjacent concrete, and FRP laminates interact unevenly along the beam [12]. This could make it less effective for UPC members to strengthen their flexural strength compared to prestressed concrete members with bonded tendons [13].…”

Section: Introductionmentioning

confidence: 99%

Usage of EB-CFRP for Improved Flexural Capacity of Unbonded Post-Tensioned Concrete Members Exposed to Partially Damaged Strands

Abbas

Al‐Zuhairi

2022

Civ Eng J

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The study presents the performance of flexural strengthening of concrete members exposed to partially unbonded prestressing with a particular emphasis on the amount (0, 14.2, and 28.5%) of cut strands-symmetrical and asymmetrical damage. In addition to examining the influence of cut strands on the remaining capacity of post-tensioned unbonded members and the effectiveness of carbon fiber reinforced polymer laminates restoration, The investigated results on rectangular members subjected to a four-point static bending load based on the composition of the laminate affected the stress of the CFRP, the failure mode, and flexural strength and deflection are covered in this study. The experimental results revealed that the usage of CFRP laminates has a considerable impact on strand strain. In addition to that, the flexural stiffness of strengthened members becomes increasingly significant within the serviceability phases as the damaged strand ratios increase. The EB-CFRP laminates increased the flexural capacity by approximately 13%, which corresponds to strand damage of 14.28% and about 9.5% for 28.57% of strand damage, which represents one of the unique findings in this field. Additionally, semi-empirical equations for forecasting the actual strain of unbonded tendons were presented. The suggested equations are simple to solve and produce precise results. Doi: 10.28991/CEJ-2022-08-06-014 Full Text: PDF

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“…Peng et al [28] tested the permeability and electrochemical impedance of calcite containing cracks, pores, and under confining pressure. Bolt anchoring technology is an indispensable reinforcement method for geotechnical engineering constructs, such as coal mine support and concrete beams [29][30][31], in addition to the fiber-reinforced composite material anchoring system [32]. Anchor bolts, such as those in underground engineering applications, can transfer loads, resist shear, and withstand tensile deformation and surrounding rock deformation [33,34].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Experiment to Evaluate the Impact of Multistage Load and Osmotic Pressure on Anchor Bolt

Sun

Wang

et al. 2022

Geofluids

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In this paper, uniaxial compression tests, multistage loading tests, and electrochemical tests were adopted to investigate the strain characteristics, failure characteristics, and electrochemical impedance of anchor bolts in a cement-gypsum composite. The uniaxial compression test results showed that the uniaxial compressive strength σ c of the three specimens were 4.4 MPa, 4.0 MPa, and 3.1 MPa, respectively, under three different osmotic pressures. The analysis of the multistage loading tests revealed that the directions of most cracks were approximately consistent with the load-bearing direction. Moreover, the existence of osmotic pressure increased the creep deformation capacity of the specimen; the greater the osmotic pressure, the stronger the deformation capacity of the specimen. The curvature relationship of the total strain curve of the three specimens was KS12 > KS22 > KS32, and the total strain curve of S32 was close to a straight line. When comparing the creep strain variation characteristics of the three specimens, it was found that, with the increase of osmotic pressure, the proportion of creep strain within the total strain gradually increased, while the proportion of corresponding elastic strain gradually decreased. Compared with the specimen before failure, the electrochemical test in the failure stage proved the variability of the Bode curves and Nyquist curves. When the osmotic pressure was 0.15 Mpa, the Bode diagram of specimen S32 in the low frequency band showed a large jump, which was stable after entering the high frequency band.

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Anchorage systems for reinforced concrete structures strengthened with fiber-reinforced polymer composites: State-of-the-art review

Cited by 40 publications

References 99 publications

Effectiveness of Fan Anchors in Preventing Debonding in FRP-Strengthened Steel Members

Effectiveness of Fan Anchors in Preventing Debonding in FRP-Strengthened Steel Members

Usage of EB-CFRP for Improved Flexural Capacity of Unbonded Post-Tensioned Concrete Members Exposed to Partially Damaged Strands

Electrochemical Experiment to Evaluate the Impact of Multistage Load and Osmotic Pressure on Anchor Bolt

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