Anchors for CFRP plates: State-of-the-art review and future potential

Mohee, Faizul M.; Al-Mayah, Adil; Plumtree, A.

doi:10.1016/j.compositesb.2016.01.011

Cited by 79 publications

(24 citation statements)

References 54 publications

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“…However, the anchor zones in strip-end locations were the main problem of beam strengthening with the CFRP prestressed strips. Without mechanical anchorages, the peeling failures at the strip ends were observed [15][16][17][18][19]. Premature debonding of the CFRP strips is one of the most common failure modes, and it could occur before the stresses in the CFRP material reach their tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Development of Bonded/Riveted Steel Anchorages of Prestressed CFRP Strips for Concrete Strengthening

et al. 2020

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CFRP (carbon fiber reinforced polymer) strips are currently often used to strengthen reinforced concrete structures in flexure. In order to ensure effective strengthening, proper connection between FRP material and concrete structure is needed. CFRP strips can be applied passively (only by bonding to the concrete surface) or actively (by prestressing before bonding). In the case of passive strengthening, CFRP strips connecting by bonding to the surface along the strengthened element are usually sufficient. However, active (prestressing) CFRP strips should be additionally anchored at their ends. Anchoring of unidirectional CFRP strips to the reinforced concrete is difficult because of their weak properties in transverse directions. The paper presents a development of mechanical steel anchorages used in an active CFRP flexural strengthening system for reinforced concrete structures. The anchorages were made of steel plates connected to CFRP strips with steel rivets and epoxy adhesive. They were developed within series of tests on specimens from small-scale to full-scale tested in an axial tensile scheme. The paper describes successive modifications of the anchorages as well as the results of full-scale tests. The final version of the anchorage developed during the research had a tensile failure force of 185 kN, which is sufficient value for CFRP strengthening purposes.

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Section: Introductionmentioning

confidence: 99%

Development of Bonded/Riveted Steel Anchorages of Prestressed CFRP Strips for Concrete Strengthening

et al. 2020

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“…The tensile load is transferred to a tensioned strip by the shear stresses operating on its surface because of micro slip-induced friction of the strip in the gripping device. The actual ratios between the surface and cross-sectional areas of the strip seems to be very appropriate for friction anchors, where the strip is clamped between wedges or bolted plates (Portnov, Kulakov, & Arnautov, 2006;Mohee, Al-Mayah, & Plumtree, 2016). In both cases, distribution of the shear stresses over the gripping surface is not 325 uniform: a stress peak is appearing near the entry into the anchor or gripping device.…”

Section: Introductionmentioning

confidence: 99%

Development of an anchorage prototype for CFRP stress-ribbon systems using 3D printing technique

Gribniak

Arnautov

Rimkus

2019

Modern Building Materials, Structures and Techniques (MBMST)

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Compared with other structure types, stress-ribbon systems are extremely simple though requiring massive anchorage blocks because of very large tensile stresses induced in the ribbons. Such structural systems are efficient in pedestrian bridges. A major drawback of these systems is related to corrosion of the steel ribbons. Unidirectional carbon fibre reinforced polymer (CFRP) has a high potential for replacing steel in the ribbons because of lightweight, high strength, and excellent resistance to corrosion and fatigue. Application of CFRP materials, however, faced serious problems due to construction of the anchorage joints. Thus, the anchorage system is the object of this research. Adhesive bonding is a simplest technology for joining structural components made of CFRP composites with polymer matrix. In the adhesion joints, the loads are transferred due to the shear effect. However, a relatively low inter-laminar shear strength of CFRP decreases effectiveness of the gripping systems. Brittle failure of the bond is often consequence of stress concentration. An innovative anchorage joint is proposed to control shear stresses by varying a local curvature of the contact surface. A natural shape of Nautilus shell was chosen for the gripping system, whereas a 3D printing technique was applied for the prototyping purpose. Mechanical behaviour of the anchorage prototypes made of printed polymeric material was investigated experimentally.

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“…(Kim et al, 2008) present a study that considers the replacement of the steel parts with CFRP U-wraps. A recent review of the type of anchors for CFRP plates that contains information on their commercial availability can be found in (Mohee et at., 2016). One of the simplest metallic anchorages is represented in Fig.…”

Section: Introductionmentioning

confidence: 99%

The Gradient Anchorage Method for Prestressed CFRP Strips: from the Development to the Strengthening of an 18 M Long Bridge Girder

Breveglieri

Czaderski

Michels³

2018

Slovak Journal of Civil Engineering

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The external bonding of carbon fiber-reinforced polymer (CFRP) strips by two-component epoxy adhesive on the concrete surfaces of buildings and bridges is a retrofitting method accepted worldwide. The gradient anchorage (GA) is an anchoring method especially developed to anchor prestressed CFRP strips to concrete elements without a need for mechanical clamping after the installation phase. This method takes advantage of the adhesives property to undergo accelerated curing when heated. The results of more than fifteen years of research on the development of the gradient anchorage at the Swiss Federal Laboratories for Materials Science and Technology (Empa) are presented in this paper. The basic principles and application steps are explained, and the main results starting from the development of the technique up to the testing of real scale girders are described, and the new challenges posed by this innovative system are highlighted. The gradient anchorage is a valid alternative to a mechanically anchored system for prestressed FRP (P-FRP).

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Anchors for CFRP plates: State-of-the-art review and future potential

Cited by 79 publications

References 54 publications

Development of Bonded/Riveted Steel Anchorages of Prestressed CFRP Strips for Concrete Strengthening

Development of Bonded/Riveted Steel Anchorages of Prestressed CFRP Strips for Concrete Strengthening

Development of an anchorage prototype for CFRP stress-ribbon systems using 3D printing technique

The Gradient Anchorage Method for Prestressed CFRP Strips: from the Development to the Strengthening of an 18 M Long Bridge Girder

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