Use of Mixed-Mode Fracture Interfaces for the Modeling of Large-Scale FRP-Strengthened Beams
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
In this study, numerical models of fiber-reinforced polymer (FRP)-strengthened beams were developed using nonlinear fracture mechanics for the modeling of the concrete-FRP (longitudinal and U-wrap) interfaces. Mode 1, Mode 2, and mixed-mode interfacial behaviors were considered. Results from the finite-element models were compared with experimental tests of large-scale strengthened beams using FRP U-wraps as anchors. The numerical program assessed the effect of the interfacial modeling in the global and local responses. A parametric study was conducted to determine the effect of additional longitudinal FRP sheets in strengthened beams with and without FRP U-wraps. Results from this study indicate that the use of a mixed-mode concrete-FRP interface is a robust numerical approach for the prediction of the global and local responses of large-scale FRP-strengthened beams. The parametric study shows that the use of FRP U-wraps could improve the strength and ductility of the FRP-strengthened beams by changing their failure mode and deflection response. Appropriate modeling of the concrete-FRP interfaces is needed to successfully predict these effects.
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Acknowledgments
The research activities described in this paper have been supported by a CAREER Grant from the National Science Foundation (Grant No. NSFCMS-0330592).
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 845 - 855
Copyright
© 2010 ASCE.
History
Received: Sep 30, 2009
Accepted: May 21, 2010
Published online: Jun 8, 2010
Published in print: Dec 2010
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