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Advances in Civil Engineering
Volume 2009, Article ID 152196, 13 pages
Research Article

FE Models of GFRP and CFRP Strengthening of Reinforced Concrete Beams

1Water Business Group, CH2M-HILL, 1100 112th Avenue NE No. 400, Bellevue, WA 98004, USA
2Bridge Group, H.W. Lochner, Inc., 2001 Front St. NE No. 120, Salem, OR 97301, USA
3School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA
4Department of Civil and Environmental Engineering, California Polytechnic State University, San Luis Obispo, CA 93407, USA

Received 19 March 2009; Accepted 27 July 2009

Academic Editor: Ayman Mosallam

Copyright © 2009 Kasidit Chansawat et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Three-dimensional finite element (FE) models are developed to simulate the behavior of full-scale reinforced concrete beams strengthened with glass and carbon fiber-reinforced polymer sheets (an unstrengthened control beam, a flexural-strengthened beam, a shear-strengthened beam, and a beam with both shear and flexural strengthening). FE models use eight-node isoparametric elements with a smeared cracking approach for the concrete and three-dimensional layered elements to model the FRP composites. Analysis results are compared with data obtained from full-scale beam tests through the linear and nonlinear ranges up to failure. It was found that the FE models could identify qualitatively trends observed in the structural behavior of the full-scale beams. Predicted crack initiation patterns resemble the failure modes observed for the full-scale beam tests.