Wedge Anchorage for CFRP Strips
Publication: Journal of Composites for Construction
Volume 12, Issue 4
Abstract
For several decades wedge anchorages have been used with great success for the prestressing of steel strands in civil engineering structures. Due to the anisotropy of carbon fiber-reinforced plastics (CFRP) these wedges are not efficient with CFRP tendons. High lateral and shear stress values develop in the CFRP–wedge interface that lead to a premature failure of the CFRP. A comparison of different anchorage methods corroborates the outstanding advantages of wedge anchorages over other anchoring techniques. To benefit from these advantages, a new wedge design is presented that eliminates the high lateral and shear stress values in the CFRP–wedge interface of conventional wedges. Numerical simulations were performed to show the advantageous lateral and shear stress distributions. Tensile tests on thick CFRP strips and a bonded CFRP–wedge interface reached ultimate loads higher than the guaranteed tensile load. The tests on thick CFRP strips were performed with an adhesively bonded wedge–CFRP and a friction only interface. The ultimate loads in the tests were for the adhesively bonded interface 84 and 87% of the guaranteed tensile load, whereas the friction only interface was even able to anchor 93% of the tensile load.
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Acknowledgments
The writer would like to thank Sika AG for the provision of CFRP strips.
References
Andrä, H.-P., and Maier, M. (2005). “Instandsetzung von Brücken mit einer neuen Generation von Spanngliedern auf Basis von CFK-Bändern.” Bauingenieur, 80(12), 7–15.
Campbell, T. I., Shrive, N. G., Soudki, K. A., Al-Mayah, A., Keatley, J. P., and Reda, M. M. (2000). “Design and evaluation of a wedge-type anchor for fiber reinforced polymer tendons.” Can. J. Civ. Eng., 27(5), 985–992.
Erki, M. A., and Rizkalla, S. H. (1993). “Anchorages for FRP reinforcement.” Concr. Int., 15(6), 54–59.
Harper, C. A. (2002). Handbook of plastic, elastomers & composites, McGraw-Hill, New York.
Horvatits, J., and Kollegger, J. (2003). “Anchorage advances.” Bridge Des. & Eng., 33(4), 69–71.
Meier, H., Meier, U., and Brönnimann, R. (1996). “Zwei Kabel für die Storchenbrücke.” Schwei. Ingenieur Archit., 44 (October), 980–985.
Nanni, A., Bakis, C. E., O’Neil, E. F., and Dixon, T. O. (1996). “Performance of FRP tendon-anchor systems for prestressed concrete structures.” PCI J., 41 (January–February), 34–44.
Pincheira, J. A., and Woyak, J. P. (2001). “Anchorage of carbon fiber reinforced polymer (CFRP) tendons using cold-swaged sleeves.” PCI J., 46(6), 100–111.
Rubinsky, I. A., and Rubinsky, A. (1954). “A preliminary investigation of the use of fibre-glass for prestressed concrete.” Mag. Concrete Res., 6 (September), 71–78.
Russel, H. (2002). “A step in the light direction.” Bridge Design & Engineering, 27 (May), 62–63.
Rytter, J., Portnov, G., and Kulakov, V. (2005). “Anchoring and load transfer technique in uniaxial tension of unidirectional high-strength composites.” Mech. Compos. Mater. Struct., 41, 217–228.
Sika AG. (2003). “Construction: Sicher Bauen mit System.” Technische Merkblätter, Ausgabe 5 (in German).
Stresshead. (2005). “Technische Dokumentation.” Stresshead AG, Luzern.
Vervuurt, A. H. J. M., Kaptijn, N., and Grundlehner, W. B. (2003). “Carbon-based tendons in the Ditelhaven Bridge, The Netherlands.” Struct. Concr. J. Fib., 4(1), 1–11.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 4 • August 2008
Pages: 446 - 453
Copyright
© 2008 ASCE.
History
Received: Feb 6, 2007
Accepted: Nov 16, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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