Dynamic Modal Identification of a Long-Span Suspension Bridge Using Measured Acceleration Data during a Storm
Publication: Journal of Structural Engineering
Volume 149, Issue 12
Abstract
This paper presents a dynamic modal identification of the Fatih Sultan Mehmet (FSM) Bridge utilizing structural health monitoring (SHM) data recorded during a recent extreme wind event (maximum wind speed: ) that occurred on November 29–30, 2021, to provide a preliminary report for future posthazard health assessments for similar long-span suspension bridges. First, four different operational modal analysis (OMA) techniques are performed to identify the bridge’s modal parameters (modal frequencies, damping ratios, and modal shapes). The analysis results are compared with each estimator and those of an experimental investigation published in the literature to verify the bridge’s modal parameters. Secondly, natural frequency history and damage indicators are determined using the modal parameters and estimated standard deviations obtained from the stochastic subspace identification with extended unweighted principal component (SSI-UPCX) technique. The result of modal damage indicators reveals a healthy structure after this extreme wind event; onsite visual inspections also support this finding. In conclusion, it is believed that these significant findings will lend invaluable knowledge to stakeholders.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to express their gratitude to Dr. Palle Andersen for granting a temporary license for ARTeMIS Modal Pro and for his valuable help during the analysis. We also acknowledge the use of imagery from the NASA Worldview application (https://worldview.earthdata.nasa.gov/), part of the NASA Earth Observing System Data and Information System (EOSDIS).
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Published In
Journal of Structural Engineering
Volume 149 • Issue 12 • December 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 18, 2022
Accepted: Jul 20, 2023
Published online: Sep 29, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 29, 2024
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