Tension Stiffening Model for Concrete Beams Reinforced with Steel and FRP Bars
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Volume 18, Issue 6
Abstract
Cracking is an important aspect of concrete behavior that considerably affects the overall response of concrete structures. The initiation of cracks is governed by concrete tensile properties. The propagation of cracks is a complicated phenomenon that plays a significant role in the nonlinear analysis of concrete structures. The cracking process in tension starts at a relatively low tensile strain, causing plain concrete to exhibit a gradual softening behavior. This softening is augmented by the tension stiffening of reinforcing bars. The smeared crack approach is typically combined with nonlinear finite-element analysis to generate an accurate global response. The key to such representative accurate predictions relates to material parameters, especially those of tension stiffening effects. For a complete understanding of the crack development process, tests should be performed on concrete specimens at various load histories. However, due to the difficulty of testing concrete in uniaxial tension, only limited and often conflicting results are available. The present work develops an inverse approach combining nonlinear numerical analysis and global experimental response to develop the tension stiffening model parameters needed to simulate homogenized concrete behavior in tension. The results of the study provide good model parameters to use in the case of concrete beams reinforced with steel and fiber-reinforced polymer (FRP) bars.
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Acknowledgments
This work was supported in part by the Department of Civil Engineering at Kansas State University. The second writer would like to acknowledge a useful discussion with Mr. Abdul Salam Issa on the sectional analysis section of the paper.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 6 • December 2006
Pages: 831 - 841
Copyright
© 2006 ASCE.
History
Received: Jan 20, 2004
Accepted: May 24, 2005
Published online: Dec 1, 2006
Published in print: Dec 2006
Notes
Note. Associate Editor: Houssam A. Toutanji
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