Time-Dependent Effect of Corrosion on the Mechanical Characteristics of Stay Cable
Publication: Journal of Bridge Engineering
Volume 23, Issue 5
Abstract
Cable-stayed bridges, of which there are up to 500 around the world, are often the first choice for long-span bridges. As stay cables increase in service life, rust becomes the most common challenge. At present, more than 20 cases of replacing corroded cables are underway worldwide. Inspections of replaced cables prove that corrosion is a leading cause of degradation in the mechanical behavior of cables. However, there is no accurate method of describing the law of degradation of the mechanical behavior of corroded cables and it remains impossible to evaluate the safety of stay cables in a timely fashion. Therefore, this paper reports a study on distribution model of steel wire corrosion, corrosion rate, and mechanical model of corroded cables, establishing governing equations for static configuration and in-plane free vibration of corroded cables. The paper also derives some analytical solutions for both the static and dynamic characteristics of corroded cables. The finite element method is adopted for the simulation and computation of the static and dynamic characteristics of corroded cables to reach, through comparison and analysis of the results of the two methods, the following conclusions. As corrosion time increases, the horizontal cable force of the corroded cable decreases nonlinearly, cable sag increases nonlinearly, and natural frequencies in-plane of the corroded cable present nonlinear reduction. In early corrosion stage, relative change of static and dynamic characteristics of cables is extremely small. For a corrosion time of 12 years, the average cross section area loss rate in cable corrosion region is 30%, but horizontal cable force is only reduced by 1%, cable sag rises only by 1%, and the decrease of each natural frequency in the plane is only 0.54%.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 5 • May 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: May 25, 2017
Accepted: Nov 13, 2017
Published online: Mar 9, 2018
Published in print: May 1, 2018
Discussion open until: Aug 9, 2018
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