Journal
STRUCTURAL ENGINEERING INTERNATIONAL
Volume 28, Issue 3, Pages 308-317Publisher
IABSE
DOI: 10.1080/10168664.2018.1462132
Keywords
damping; monitoring; bridge; serviceability; operational modal analysis (OMA)
Funding
- National Research Foundation of Korea (NRF) via the Korean government (MSIP) [2017R1A2B4008973]
- Ministry of Land, Infrastructure and Transport of the Korean government [17SCIPB119960-02]
- National Research Foundation of Korea [2017R1A2B4008973] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study proposes an enhanced damping estimation procedure for flexible cable-supported bridges based on operational modal analysis (OMA). The OMA approach combines the natural excitation technique (NExT) with an eigensystem realization algorithm (ERA). An amplitude modulating (AM) function is introduced to stationarize the vehicle-induced responses. This study proposes guidelines for the selection of parameters for the NExT-ERA algorithm and AM-based stationarization. The proposed damping estimation procedure and parameter selection guidelines were applied to the data gathered from measuring an in-service cable-stayed bridge over a three-day period. The correlations between the identified damping ratios and environmental factors such as vibration level, temperature and wind velocity were investigated. The effect of aerodynamic damping during OMA is also discussed. The examined data identifies the amplitude-dependency of the damping ratios.
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