Damping Identification and Serviceability Assessment of a Cable-Stayed Bridge Based on Operational Monitoring Data
Publication: Journal of Bridge Engineering
Volume 22, Issue 3
Abstract
This study reports on the assessment of the vibrational serviceability performance of a parallel cable-stayed bridge, which was subjected to a vortex-induced vibration (VIV) in 2011, by identifying modal damping ratios from the operational monitoring data that were obtained. The natural excitation technique (NExT) combined with the eigen realization algorithm (ERA) was applied for the output-only modal analysis. Parameters regarding the NExT and ERA procedures were determined from a sensitivity analysis of identified damping ratios. Because a multiple tuned mass damper (MTMD) was installed at the center of the main span to mitigate VIV, the modal damping ratios before and after the installation of the MTMD were also compared. Several sets of operational monitoring data that had been collected under various windy conditions were used to develop a relationship between the identified damping ratios and the corresponding VIV level of the bridge. On the basis of these findings, the performance of the bridge was enhanced regarding vibrational serviceability.
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Acknowledgments
This research was supported by a grant (15CCTI-A052531-08-000000) from the Ministry of Land, Infrastructure, and Transport of the Korean government through the Core Research Institute at Seoul National University for Core Engineering Technology Development of Super Long Span Bridge R&D Center and partially supported by the Integrated Research Institute of Construction and Environmental Engineering at Seoul National University. The authors acknowledge the Hyundai Engineering and Construction (HDEC), the Korea Infrastructure Safety and Technology Corporation (KISTEC), and TE-Solution for sharing field measurement data and information related to the vibration of the 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: Dec 28, 2015
Accepted: Aug 30, 2016
Published online: Oct 20, 2016
Published in print: Mar 1, 2017
Discussion open until: Mar 20, 2017
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