Modeling Bar Slip in Nonductile Reinforced Concrete Columns
Publication: Journal of Structural Engineering
Volume 142, Issue 10
Abstract
Bar slip deformations in reinforced concrete frame structures cause additional flexibility at the boundaries of beams and columns due to penetration of rebar strain into the joints and footings. There are several available analytical models that estimate bar slip deformations, many of which have difficulties capturing the bar slip deformations that occur after flexural-axial damage. A new methodology is proposed to effectively account for bar slip deformations within the existing elements of an analytical model, without increasing the complexity of the system. This new method shows good agreement with previous experimental results and was successfully used in large-scale hybrid simulations. A series of hybrid simulations were conducted involving full-scale concrete columns instrumented to measure the bar slip deformations. The results of these tests, along with previous experimental studies, are used to develop a new model for the slip of rebar embedded in concrete. The proposed bar slip model is developed for use in nonductile columns and is shown to achieve good agreement with experimental results.
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Acknowledgments
This paper is based upon research supported by the National Science Foundation under Grant No. NEES/CMMI-1135005. The authors greatly appreciate this support. The authors would like to thank the team at UIUC for their help with the experiment.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 21, 2015
Accepted: Feb 25, 2016
Published online: May 9, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 9, 2016
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