Simplified Anchor System for CFRP Rods
Publication: Journal of Composites for Construction
Volume 17, Issue 5
Abstract
The increased use of carbon fiber–reinforced polymer (CFRP) rods in prestressed concrete applications has been challenged by identifying a suitable anchor system. To overcome such a challenge, the design of a simplified anchor system composed of three wedges and a barrel, without a soft sleeve, is presented to duplicate the simplicity of the widely utilized anchor systems in steel strands. A numerical study and experimental verification of the simplified anchor system for a CFRP rod are presented. Three-dimensional (3D) finite-element modeling has been conducted on the anchor system consisting of isotropic steel wedges and barrel, in addition to an orthotropic CFRP rod. The wedges and barrel are modeled as elastoplastic materials of different hardness. The rod/wedge and wedge/barrel interfaces are simulated using surface-based contact models having different coefficients of friction. Two hardness levels [171 and 319 Vickers hardness numbers (VPN)] are considered for the wedges. When the softer wedges are utilized the ultimate tensile strength of the CFRP is attained. With the harder wedges the rod fails prematurely due to slippage followed by fracture. The performance of the anchor system using numerical modeling successfully describes the experimental results.
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Acknowledgments
The authors thank the Natural Sciences and Engineering Research Council of Canada, and Hughes Brothers Inc. for their support.
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Published In
Journal of Composites for Construction
Volume 17 • Issue 5 • October 2013
Pages: 584 - 590
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 2, 2012
Accepted: Jan 24, 2013
Published online: Jan 26, 2013
Discussion open until: Jun 26, 2013
Published in print: Oct 1, 2013
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