Quasi-Balanced Failure Approach for Evaluating Moment Capacity of FRP Underreinforced Concrete Beams
Publication: Journal of Composites for Construction
Volume 12, Issue 3
Abstract
Failure of concrete beam sections underreinforced with fiber-reinforced polymer (FRP) is initiated by FRP rupture before concrete crushing. In such a case, the typical rectangular stress block based on the balanced failure mechanism may not apply. In the present study, rigorous sectional analyses are performed implementing existing concrete stress-strain models for a wide range of values of design parameters. Based on the results of the numerical analyses, the variation of parameters of equivalent stress block of concrete was investigated, and an alternative, yet simple, design method for evaluating moment-carrying capacity of FRP underreinforced concrete beam using quasi-balanced failure approach was developed. The proposed design method was verified by comparing the predicted moment-carrying capacity with existing test results.
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Acknowledgments
The financial support by the University of New Mexico is greatly appreciated. The writers would also like to thank Scott Horton for his help in the initial studies.
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© 2008 ASCE.
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Received: Aug 24, 2006
Accepted: May 8, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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