TY - GEN
T1 - Long-Term Damping Characteristics of a Cable-Stayed Bridge
AU - Hwang, Doyun
AU - Kim, Sunjoong
AU - Kim, Ho Kyung
N1 - Publisher Copyright:
© IABSE Congress Nanjing 2022 - Bridges and Structures: Connection, Integration and Harmonisation, Report. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Damping ratio is a crucial factor in assessing the vibrational serviceability of flexible large-scale structures such as cable-supported bridges. While the natural frequencies of structures have been estimated from operational modal analysis (OMA) with relatively minimal scattering, damping ratios have shown a high degree of scattering due to analytical uncertainty and in environmental and operational variations (EOV). To examine the damping ratio in context of EOVs, an automated damping estimation framework is applied with minimal user intervention to 2,5 years of long-term data acquired from a sparse continuous monitoring system. Daily and long-term fluctuations of damping ratios are examined. Environmental and operational factors such as temperature, wind environment and level of excitation are examined in context with damping ratios. The probability distribution of the damping ratio is also suggested based on statistical methods.
AB - Damping ratio is a crucial factor in assessing the vibrational serviceability of flexible large-scale structures such as cable-supported bridges. While the natural frequencies of structures have been estimated from operational modal analysis (OMA) with relatively minimal scattering, damping ratios have shown a high degree of scattering due to analytical uncertainty and in environmental and operational variations (EOV). To examine the damping ratio in context of EOVs, an automated damping estimation framework is applied with minimal user intervention to 2,5 years of long-term data acquired from a sparse continuous monitoring system. Daily and long-term fluctuations of damping ratios are examined. Environmental and operational factors such as temperature, wind environment and level of excitation are examined in context with damping ratios. The probability distribution of the damping ratio is also suggested based on statistical methods.
KW - cable-supported bridges
KW - damping
KW - environmental
KW - long-term monitoring
KW - operational modal analysis
KW - operational variations
KW - system identification
UR - http://www.scopus.com/inward/record.url?scp=85142902723&partnerID=8YFLogxK
U2 - 10.2749/nanjing.2022.1273
DO - 10.2749/nanjing.2022.1273
M3 - Conference contribution
AN - SCOPUS:85142902723
T3 - IABSE Congress Nanjing 2022 - Bridges and Structures: Connection, Integration and Harmonisation, Report
SP - 1273
EP - 1279
BT - IABSE Congress Nanjing 2022 - Bridges and Structures
PB - International Association for Bridge and Structural Engineering (IABSE)
T2 - IABSE Congress Nanjing 2022 - Bridges and Structures: Connection, Integration and Harmonisation
Y2 - 21 September 2022 through 23 September 2022
ER -