Flexural Response of Concrete Beams Prestressed with AFRP Tendons: Numerical Investigation
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Volume 14, Issue 6
Abstract
This paper presents the flexure of concrete beams prestressed with aramid fiber-reinforced polymer (AFRP) tendons. Three-dimensional nonlinear finite-element analysis and iterative sectional analysis are conducted to predict the behavior of AFRP-prestressed members, including experimental validation. The beams are simply supported and monotonically loaded until failure occurs. The sectional properties of the beams include a reinforcement ratio of 0.15% to 0.36% and an ratio of 25 to 77, where and are the gross and cracked moment of inertia, respectively. Various prestressing levels are applied to the beams to evaluate the load versus displacement response, variation of neutral axis depth, effective moment of inertia, and deformability of the beams. The applicability of code provisions and existing predictive equations are examined. The prestress level in the AFRP tendons significantly influences the flexural behavior of the beams, namely, cracking load, strain development of AFRP, and neutral axis depth. Sectional properties such as the ratio are an important parameter that affects the deflection characteristics of AFRP-prestressed beams, including a deformability index. Recommendations to improve the current design provisions are addressed.
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Acknowledgments
The writer gratefully acknowledges the support of North Dakota Experimental Program to Simulate Competitive Research (ND EPSCoR) through the National Science Foundation (NSF) with Grant No. NSFFAR0013510.
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 647 - 658
Copyright
© 2010 ASCE.
History
Received: Oct 13, 2009
Accepted: Apr 2, 2010
Published online: Apr 8, 2010
Published in print: Dec 2010
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