In-Service Condition Assessment of a Long-Span Suspension Bridge Using Temperature-Induced Strain Data
Publication: Journal of Bridge Engineering
Volume 22, Issue 3
Abstract
Monitoring data of civil structures mainly include load- and temperature-induced structural responses. Traditional damage-detection methods use vibration-based structure responses by eliminating temperature effects from the measured data. In this article, a new structural damage identification method using temperature-induced responses is proposed and applied to a long-span suspension bridge. The novelty of the method is that it derives the structural transfer function by taking temperature load variation and temperature-induced strains input–output data; thus, it is able to accurately reveal inherent structural characteristics, unlike traditional methods that use structural vibration responses from ambient testing. In the proposed method, the temperature-induced strain is separated from measured strain responses with ensemble empirical mode decomposition (EEMD) technology, and a Euclidean distance-based damage index is defined that uses temperature variations and temperature-induced strains for structural damage detection. Numerical analysis results successfully verify the feasibility of the proposed method, which was used to evaluate the condition of a long-span suspension bridge before and after a ship collision with the use of the monitoring data. The performance of the bridge under normal operating conditions was also evaluated through the proposed method with the use of long-term monitoring data, including temperatures and strains.
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Acknowledgments
This work was financially sponsored by the National High-Tech R&D Program of China (Grant 2014AA110401). The first author appreciates the support from the Research Innovation Program for College Graduates of Jiangsu Province and the Fundamental Research Funds for the Central Universities (Grant KYLX15-0085). Dr. Yufeng Zhang of Jiangsu Transportation Research Institute is greatly appreciated for providing the monitoring data of the Jiangyin Bridge.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 3 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 9, 2016
Accepted: Aug 30, 2016
Published online: Oct 26, 2016
Published in print: Mar 1, 2017
Discussion open until: Mar 26, 2017
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