Design and experimental analysis of a novel wedge anchor for prestressed CFRP plates using pre-tensioned bolts

Ye, Huawen; Liu, Changmeng; Hou, Shuang; Wang, Tianqi; Li, Xinshun

doi:10.1016/j.compstruct.2018.08.075

Cited by 20 publications

(3 citation statements)

References 23 publications

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“…The anchorage's high performance was illustrated by the average recorded CFRP failure load of 172.3 (±5.7) kN, which surpassed the reported CFRP tensile strength of 168 kN (2800 MPa). As a comparison, the mechanical anchorage developed by Ye et al ( 2018) successfully gripped a CFRP plate that was 25 mm wide and 1.5 mm thick with a tensile strength of 1950 MPa; however, the anchorage was somewhat large in size with a length of 150 mm, a width of 120 mm, and a thickness of 40 mm [24]. On the other hand, the developed wedge anchorage has a length of 70 mm and a diameter of 76.2 mm, and it was capable of gripping a wider CFRP plate with a higher tensile strength of 2800 MPa, illustrating its high performance despite its small size.…”

Section: Generalmentioning

confidence: 99%

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Innovative Wedge Anchorage for CFRP Plates: Development and Testing

Alhusain,

Al-Mayah

2024

J. Compos. Sci.

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Gripping prestressed carbon fiber-reinforced polymers (CFRPs) in structural strengthening applications is challenging due to CFRPs’ susceptibility to lateral loading. This paper presents a reliable and reusable wedge anchorage for gripping CFRP plates that are 50 mm wide and 1.2 mm thick. The cylindrical anchorage, which is 75 mm long and 76.2 mm in diameter, consists of an external steel barrel, two internal steel wedges, and two soft copper sleeves. The barrel-wedge interface is designed using an innovative arc–linear configuration, through which the desired stress distribution is attained, preventing stress concentration and the premature failure of the CFRP plate. The wedge anchorage was experimentally tested by applying a displacement-controlled tensile load of 0.6 mm/min until the complete fracture of the CFRP plate. The anchorage’s performance was examined under distinct installation conditions by applying different presetting levels: high (40–120 kN) and low (hammering) presetting. It was observed that the anchorage successfully prevented CFRP premature failure in all tests by achieving an average tensile loading of 172.3 (±5.7) kN, exceeding its reported tensile strength of 168 kN (2800 MPa). Minor CFRP displacements of 6.26 (±0.75) mm and 3.33 (±0.16) mm were recorded under low and high presetting levels, respectively. Similarly, the CFRP slippage relative to the wedges for the low and high presetting tests was only 1.18 (±0.75) mm and 0.33 (±0.15) mm, respectively. Also, only minor scratches were observed in the wedge–barrel interface, indicating the absence of extensive plastic deformation.

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Section: Generalmentioning

confidence: 99%

“…However, prestressing CFRPs without causing premature failure is challenging due to their vulnerability to lateral loads [15][16][17]. Thus, several anchorage systems have been developed to grip CFRP elements effectively, including resin-potted [18][19][20][21][22], clamp [23,24], and wedge anchorages [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Innovative Wedge Anchorage for CFRP Plates: Development and Testing

Alhusain,

Al-Mayah

2024

J. Compos. Sci.

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“…[25,26] proposed an anchorage method that combines flat plate anchorage and U type CFRP sheets, and concrete reinforcement tests were conducted, but the tension magnitude of CFRP plate is still restricted at a low level. Ye et al [27,28] and Mohee et al [29,30] placed a tapered wedge inside a plate press fit-type anchor and achieved favorable anchorage performance without using any binding agent to clamp the CFRP plates. However, this anchorage system was not convenient for engineering applications due to its large size.…”

Section: Introductionmentioning

confidence: 99%

Method of Designing a Friction-Based Wedge Anchorage System for High-Strength CFRP Plates

et al. 2021

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The cables of high-strength carbon fiber reinforced polymer (CFRP) plates are starting to be applied to large spatial structures. However, their main anchorage systems rely on the adhesive force, which entails risks to their integrity resulting from aging of the binding agent. In this study, a friction-based wedge anchorage system was designed for CFRP plates. The working mechanism of the proposed anchorage system was explored both theoretically and experimentally. The anti-slip mechanism and condition of CFRP plates were formulated so that the equivalent frictional angle of the contact surface between a CFRP plate and wedges must not be smaller than the sum of the dip angle of the wedge external conical surface and the frictional angle between the wedges and barrel. An analysis of the stress distribution in the anchorage zone of the CFRP plate was conducted using the Tsai-Wu failure criterion, which concluded that the compressive stresses should be reduced on the section closer to the load-bearing end of the anchorage system. Furthermore, the anchorage efficiency coefficient was proposed, which depends on stress concentration coefficients, plate thickness, length of anchorage zone, dip angle of wedge external conical surface, and its frictional angle. Then, it was determined that the minimum length of an anchorage zone for the CFRP plates with various specifications should be at least 49 times larger than the CFRP thickness. A finite element analysis and static tensile tests on six specimens were carried out. The experimental results revealed that the anchorage efficiency coefficient of the optimized anchor reached 97.9%.

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Novel Wedge Anchorage for CFRP Plates

Alhusain

Al-Mayah

2021

Lecture Notes in Civil Engineering

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Design and experimental analysis of a novel wedge anchor for prestressed CFRP plates using pre-tensioned bolts

Cited by 20 publications

References 23 publications

Innovative Wedge Anchorage for CFRP Plates: Development and Testing

Innovative Wedge Anchorage for CFRP Plates: Development and Testing

Method of Designing a Friction-Based Wedge Anchorage System for High-Strength CFRP Plates

Novel Wedge Anchorage for CFRP Plates

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