Design and evaluation of a wedge-type anchor for fibre reinforced polymer tendons

Campbell, T.I.; Shrive, N.G.; Soudki, K.A.; Al-Mayah, A.; Keatley, J.P.; Reda, M.M.

doi:10.1139/cjce-27-5-985

Cited by 12 publications

(7 citation statements)

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“…Thus, the anchorage efficiency can be improved, and the local premature failure of the rods at the loading end can also be prevented. Campell et al [8] did some experiments on the wedge-type anchor, and the results show that the stiffness of the anchorage and radial stress at the barrel-wedge interface increases as the coefficient of friction decreases through greasing. The experimental results of [20] also indicate that the stiffness and loading capacity of the bonding anchor increases as the inclined angle increases from 0° to 3°, which are in good agreement with the FE results above.…”

Section: Numerical Results Of Inner Cone Anchormentioning

confidence: 99%

“…A four-wedge type anchor used to grip a single CFRP rod was proposed [7]. The effect of the friction coefficient, the barrel-wedge angle difference and the soft metal sleeve on the stress distribution and stiffness of the anchor was studied [8]. Similar research has shown that the friction coefficient, preload value and sleeve material has a significant effect on the anchorage performance [9][10][11].…”

Section: Open Accessmentioning

confidence: 99%

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Mechanical Analysis of Stress Distribution in a Carbon Fiber-Reinforced Polymer Rod Bonding Anchor

et al. 2014

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This paper presents an elastic shear stress distribution theoretical model at the carbon fiber-reinforced polymer (CFRP)-adhesive interface of a single-rod and a multi-rod straight-pipe bonding anchor. A comparison between theoretical and finite element analysis results reveals that the accuracy of the theory can be used to guide the preliminary design of CFRP rod bonding anchors. The mechanical performance of the inner cone bonding anchor for multi-rods are evaluated within different coefficients of friction and inner inclined angles. Numerical results indicate that the straight-parabolic inner cone bonding anchor has a significant effect on reducing the shear force at the loading end.

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Section: Numerical Results Of Inner Cone Anchormentioning

confidence: 99%

Section: Open Accessmentioning

confidence: 99%

Mechanical Analysis of Stress Distribution in a Carbon Fiber-Reinforced Polymer Rod Bonding Anchor

et al. 2014

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“…Then, three pole specimens (Nos. [12][13][14] were loaded with three different sustained bending creep moments, and the tests were run for 16.5 years. The following conclusions can be drawn on the basis of the study described in this paper:…”

Section: Discussionmentioning

confidence: 99%

“…Early experimental studies focused on the static mechanical performance of either the anchorage area of the prestressing elements, which was realized with mechanical anchors for post-tensioning systems [10][11][12], or on the static direct bond performance of tendons and rebars [13][14][15][16]. Static testing, however, cannot assess the degradation due to creep, which is a major cause for failure in the long term.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Bending Creep Behavior of Thin-Walled CFRP Tendon Pretensioned Spun Concrete Poles

2014

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This paper discusses the long-term behavior of a series of highly-loaded, spun concrete pole specimens prestressed with carbon fiber-reinforced polymer (CFRP) tendons, which were subjected to outdoor four-point bending creep tests since 1996 in the frame of collaboration with the Swiss precast concrete producer, SACAC (Società Anonima Cementi Armati Centrifugati). The 2 m span cylindrical beams studied are models for lighting poles produced for the last 10 years and sold on the European market. Five thin-walled pole specimens were investigated (diameter: 100 mm; wall-thickness: 25-27 mm). All specimens were produced in a pretensioning and spinning technique and were prestressed by pultruded CFRP tendons. Initially, two reference pole specimens were tested in quasi-static four-point bending to determine the short-term failure moment and to model the short-term flexural behavior. Then, three pole specimens were loaded to different bending creep moments: while the lowest loaded specimen was initially uncracked, the second specimen was loaded with 50% of the short-term bending failure moment and exhibited cracking immediately after load introduction. The highest loaded pole specimen sustained a bending moment of 72% of the short-term bending failure moment for 16.5 years before failing in July 2013, due to the bond failure of the tendons, OPEN ACCESSPolymers 2014, 6 2066 which led to local crushing of the high-performance spun concrete (HPSC). Besides this, long-term monitoring of the creep tests has shown a limited time-and temperature-dependent increase of the deflections over the years, mainly due to the creep of the concrete. A concrete creep-based model allowed for the calculation of the long-term bending curvatures with reasonable accuracy. Furthermore, the pole specimens showed crack patterns that were stable over time and minimal slippage of the tendons with respect to the pole's end-faces for the two lower load levels. The latter proves the successful and durable anchorage of these novel CFRP prestressing tendons in thin-walled, precast concrete members under realistic long-term service loads.

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“…Numerous efforts from researchers [e.g. [10][11][12][13][14][15][16][17][18][19] came up with three basic types of anchorage systems for CFRP tendons with respect to load transfer mechanism, namely, (1) adhesively bonded anchorage system (such as in Fig. 1a), (2) mechanical clamping anchorage system (such as in Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental study on fatigue performance of adhesively bonded anchorage system for CFRP tendons

Xie

Tang

Wang

et al. 2018

Composites Part B: Engineering

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This study is concerned with the fatigue performance of adhesively bonded anchorage for carbon fiber reinforced polymer (CFRP) tendons subjected to cyclic loading. Series of monotonous and cyclic experiments under different stress amplitudes and loading frequencies were carried out in order to investigate the mechanical performance of bonded anchorage systems for CFRP tendons and to study the influence of cyclic loading on the anchoring performance. The fatigue damage and the relationships between damage, loading frequency and interfacial temperature rise of anchorage systems were analyzed. The results show that cyclic tension-tension loading is instrumental in enhancing the synergistic interaction between the anchorage components and it also stabilizes the entire anchorage system performance provided that the stress amplitude is kept lower than 10% of the ultimate tensile capacity of the anchorage systems and the maximum stress is less than 50% of the ultimate capacity of the anchorage system. The loading frequency influences significantly the temperature variation in the anchorage system. A high loading frequency may result in a sharp temperature rise at the early-stage and mid-stage of cyclic tension-tension loading, followed by a rather stable late stage. This phenomenon of temperature rise during fatigue tests may indicate the extent of fatigue damage in the anchorage system.

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Design and evaluation of a wedge-type anchor for fibre reinforced polymer tendons

Cited by 12 publications

References 0 publications

Mechanical Analysis of Stress Distribution in a Carbon Fiber-Reinforced Polymer Rod Bonding Anchor

Mechanical Analysis of Stress Distribution in a Carbon Fiber-Reinforced Polymer Rod Bonding Anchor

Long-Term Bending Creep Behavior of Thin-Walled CFRP Tendon Pretensioned Spun Concrete Poles

Experimental study on fatigue performance of adhesively bonded anchorage system for CFRP tendons

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