Simplified Methodology for the Evaluation of the Residual Strength of Corroded Reinforced Concrete Beams
Publication: Journal of Performance of Constructed Facilities
Volume 24, Issue 2
Abstract
Steel corrosion in reinforced concrete (RC) structures leads to change of steel mechanical properties, longitudinal cracking in the concrete cover, and other related effects that weaken the serviceability and load capacity of the composites. It is therefore extremely important to have methods targeted to the evaluation of the structural damage induced by corrosion for estimating the residual load capacity of a structure, and then for inspection procedures and strengthening the maintenance interventions. This paper presents a simplified methodology capable of providing estimates of the residual life of corroded RC beams. The proposed method uses damaged material properties, and accounts for the length of partial corrosion and the amount of corrosion, concrete loss and change of bond strength within this specified length. A comparison of the model predictions with the experimental results published in the literature shows the validity of the model. It is also concluded that the ultimate flexural moment of corroded RC beam will not significantly influenced by the partially corroded or unbonded length and the bond characteristics over this partial length as long as the tensile steel of the beam can reach its yield strength. In addition, although complete loss of bond over the partial length is assumed to asses the residual strength of corrosion-damaged RC beam, neglecting the influence of bond strength within the corroded length may lead to underestimate the ultimate flexural capacity of the damaged beam, especially when the corrosion level of tensile steel of the RC beam is not very high.
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Acknowledgments
The writers gratefully acknowledge the support provided by the National Natural Science Foundation of China (Grant No. NNSFC50508020).
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 24 • Issue 2 • April 2010
Pages: 108 - 119
Copyright
© 2010 ASCE.
History
Received: Jan 24, 2009
Accepted: Jul 16, 2009
Published online: Aug 15, 2009
Published in print: Apr 2010
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