Effects of Reinforcement Corrosion on the Performance of RC Frame Buildings Subjected to Seismic Actions
Publication: Journal of Performance of Constructed Facilities
Volume 27, Issue 6
Abstract
Corrosion of reinforcing bars is a common deficiency for existing RC buildings, which may have significant adverse effects on seismic performance of those buildings. The main effects of corrosion of reinforcing bars are strength loss as a result of reduction of the effective cross-sectional area of the bars, reduced bond strength between concrete and bars as a result of the increased volume of the bars because of rust products, and reduced elongation capacity of the bars as a result of the concentration of plastic deformations at sections of corrosion pits. The last item (concentration of plastic deformations of reinforcing bars only at the most heavily corroded sections rather than occurring all through the potential plastic hinge length) has a very remarkable adverse effect on the displacement capacity of existing buildings. It is known that the displacement capacity is as important as strength, particularly for the buildings that are designed to exhibit ductile behavior during earthquakes. In this study, this adverse effect is demonstrated quantitatively through nonlinear pushover and nonlinear time-history analyses of a hypothetical RC frame building. To obtain more general conclusions, different corrosion intensities and distributions of reinforcing bars and different earthquake records are considered in the analyses. Furthermore, the results of an experimental study on the seismic performance of RC columns with corroded reinforcing bars, which constituted the reason for the analytical studies, are presented.
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Acknowledgments
The contributions of Assistant Professor I. Bedirhanoglu, Research Assistant M. Comert, Telateks Textile Company, and the staff of the Structural and Earthquake Engineering Laboratory and Building Materials Laboratory of Istanbul Technical University are gratefully acknowledged.
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Information & Authors
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Published In
Journal of Performance of Constructed Facilities
Volume 27 • Issue 6 • December 2013
Pages: 683 - 696
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 10, 2012
Accepted: Jul 23, 2012
Published online: Aug 8, 2012
Published in print: Dec 1, 2013
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