Tension Chord Model Modification for Uniaxial Unloading and Reloading in Elastic and Plastic States
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Structural Engineering
Volume 140, Issue 10
Abstract
The bond properties between concrete and steel reinforcement influence structural stiffness and deformation behavior as a result of tension stiffening. In specific cases, the load-bearing capacity of engineering structures depends on the deformation behavior and may be affected by load history because of unloading and reloading (UR) cycles. The bond stress-slip relationship of the original tension chord model was modified to make it applicable for general UR cycles in the elastic and plastic states of the reinforcing steel by reducing the admissible bond shear stress, thus taking into account the progressive and irreversible damage to the concrete around the ribbed bar attributable to yielding and the load history. The residual tension stiffening in the elastic state is influenced by the degree of slip reversal, for which an analytical function was found that is dependent on the crack spacing, bond strength, and stress levels before and after unloading. The proposed analytical model was successfully validated with experimental results.
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Acknowledgments
The authors wish to acknowledge the support and funding of this research by the Swiss Federal Commission for Technology and Innovation CTI (Grant No. 11569.1 PFIW-IW) and F.J. Aschwanden AG, Lyss, Switzerland.
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Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 10 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 12, 2013
Accepted: Nov 7, 2013
Published online: May 15, 2014
Published in print: Oct 1, 2014
Discussion open until: Oct 15, 2014
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