Long-Term Damping Characteristics of Twin Cable-Stayed Bridge under Environmental and Operational Variations
Publication: Journal of Bridge Engineering
Volume 26, Issue 9
Abstract
The recent development of automated operational modal analysis (OMA) has enabled the modal tracking of environmental and operational conditions. Variations in these conditions have prevented investigations into the long-term characteristics of the damping ratio due to its inherently high degree of scattering. In this study, the long-term damping characteristics of a twin cable-stayed bridge under environmental and operational variations were investigated. A displacement reconstruction algorithm was applied to resolve the model-order dependency in OMA-based damping estimates. In order to automatically establish groups of modal estimates, optimal parameters for a density-based unsupervised clustering algorithm were proposed on the basis of gaps between target modal frequencies. The proposed clustering parameters were first validated by comparing the clustering results with those of manually determined ground truth classes. Next, the applicability of the clustering parameters for long-term damping estimation was demonstrated by quantifying the dispersion of modal estimates in each cluster. Subsequently, the framework was applied to 2.5 years of monitoring data to evaluate the long-term damping characteristics of the twin cable-stayed bridge that is often subjected to high variations in environmental and operational conditions. The following aspects are mainly discussed: (1) seasonal fluctuation in long-term damping ratios; (2) the effect that aerodynamic interference exerts on variations in the dynamic characteristics; and (3) the amplitude dependency of the damping ratio. The probability distribution of the modal damping ratio is provided based on the statistical analysis of reliable modal damping ratios.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (No. 2020R1A2B5B0100165711) through the Integrated Research Institute of Construction and Environmental Engineering at Seoul National University. The authors are grateful to the owner of the Jindo Bridge and to the Korea Authority of Land & Infrastructure Safety (KALIS) for sharing the operational monitoring data and information. The photo in Fig. 2(a) was provided by the Jindo County Office and used in this manuscript according to Korea Open Government License (KOGL).
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 9 • September 2021
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© 2021 American Society of Civil Engineers.
History
Received: Oct 12, 2020
Accepted: May 14, 2021
Published online: Jun 29, 2021
Published in print: Sep 1, 2021
Discussion open until: Nov 29, 2021
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