Effect of Corrosion on Bond Mechanism between Extremely Low-Strength Concrete and Plain Reinforcing Bars
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 3
Abstract
In this study, a bond-slip model is proposed to take into account the effects of corrosion on the bond characteristics between extremely low-strength concrete and plain reinforcing bars. The proposed bond-slip model is based on reversed cyclic lateral loading tests of nearly full-scale reinforced concrete columns with reinforcing bars corroded to different levels. The columns taken into consideration during the current study were part of an extensive experimental program designed to study the performance of older columns at Istanbul Technical University. The columns were representative of a large number of underperforming reinforced concrete buildings prone to seismic actions throughout the world. Test results demonstrated that the corrosion of reinforcing bars had a significant effect on the strength and deformability characteristics of substandard reinforced concrete columns subjected to the combined actions of axial and reversed cyclic lateral loads. Taking this aspect into consideration, a novel bond-slip model is established to estimate the variation in bond strength degradation and the bond strength as a function of the level of corrosion of the reinforcing bars. Furthermore, the predictions of the proposed model are also verified with experimental results from the literature.
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Acknowledgments
The experimental study was performed at the Structural and Earthquake Engineering and Building Material Laboratories of Istanbul Technical University (ITU). The contributions of Dr. C. Demir, B. Demirtas (MSc), E. Binbir (MSc), A. Aydoğmus (BSc), K. Darilmaz, M. Urgen, Dr. B. Yuksel, K. Orakcal, U. Demir (MSc), ITU Scientific Research Fund Department (Project No. 32794), TUBITAK (Scientific Research Project No.104I022), Telateks Textile Co., Nuh Concrete Co., and Oyak Concrete Co. are gratefully acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 22, 2015
Accepted: May 20, 2015
Published online: Jul 6, 2015
Discussion open until: Dec 6, 2015
Published in print: Jun 1, 2016
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