Short-Term Partial-Interaction Behavior of RC Beams with Prestressed FRP and Steel
Publication: Journal of Composites for Construction
Volume 18, Issue 1
Abstract
The deformation of a prestressed concrete (PC) member is controlled by the variation in flexural rigidity (EI) both along the length of the member and with applied loads. Typically, the moment-curvature approach is used to quantify EI with the analysis being mechanically correct prior to cracking as the only empirically derived components are the material stress-strain relationships. Postcracking, however, the approach has to be semi-empirical as it cannot directly simulate the effects of tension stiffening. This paper presents a displacement-based approach for determining the behavior of PC members, with and without supplementary tension reinforcement. Applying the mechanics of partial-interaction (PI) theory, the approach directly simulates the formation and widening of cracks as the reinforcement pulls from the crack face, thus directly allowing for tension stiffening. The PI approach can quantify the equivalent flexural rigidities () associated with tension-stiffening which can be used in standard analysis techniques to predict member behavior. The proposed PI is finally used to predict the behavior of members with both steel and fiber-reinforced polymer (FRP) reinforcement and a good correlation with test results from serviceability to ultimate loading is obtained.
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Acknowledgments
The authors would like to acknowledge the support of the Australian Research Council ARC Discovery Project DP0985828, “A unified reinforced concrete model for flexure and shear.”
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Published In
Journal of Composites for Construction
Volume 18 • Issue 1 • February 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 25, 2013
Accepted: Jun 24, 2013
Published online: Jun 26, 2013
Published in print: Feb 1, 2014
Discussion open until: Mar 16, 2014
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