Structural Response of Corroded, Unbonded Posttensioned Beams
Publication: Journal of Structural Engineering
Volume 137, Issue 7
Abstract
This paper presents the development of models and the analytical study of the structural response of deteriorating unbonded posttensioned beams, with the aim of providing suitable tools for the evaluation of existing deteriorated structures. The corrosion phenomena of the tendons are reviewed in the introduction. Two modeling approaches are proposed: (1) beam macro finite-elements (MFE) using cross-section analysis and (2) two-dimensional (2D) nonlinear finite-element (FE) analysis. The corrosion attack modeling considers tendon-breaking and ductility-reduction of the prestressing and mild steel. Bond deterioration is also considered for the ordinary reinforcement. The models are validated by simulating three tests on corroded beams with unbonded prestressing wires, part of the Rance benchmark exposed to 40 years of attack in a natural marine environment, and then tested for imposed loading in the laboratory. The results obtained for the global response show a good agreement with the tests at all stages of loading. The model’s predictions regarding the strain in the ordinary bars and unbonded wires are discussed in relation to the ductility reduction of the reinforcement caused by pitting corrosion and the risk of stress-corrosion cracking. Both modeling approaches are adequate, with different levels of discretization and size of the output. The MFE modeling is appealing for use in practice because of its computational simplicity.
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Acknowledgments
This research project was partly developed within COST Action 534 New Materials and Systems for Prestressed Concrete Structures, Working Group 5, New Service Life Methodologies.
The authors acknowledge the financial support of the UNSPECIFIEDFrench Ministry of National Education, Research, and Technology in the Beams of the Rance Benchmark.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 7 • July 2011
Pages: 761 - 771
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 29, 2009
Accepted: Sep 12, 2010
Published online: Sep 22, 2010
Published in print: Jul 1, 2011
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