TY - GEN
T1 - Field test study of bridge scour diagnostic method based on time-varying frequency
AU - Zhang, Z. H.
AU - Li, Y.
AU - Yang, C.
AU - Sun, H.
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024
Y1 - 2024
N2 - Scour is one of the main hidden diseases of bridge substructure, which will lead to the significant loss of foundation stiffness and bearing capacity. A scour diagnostic method of pile foundation based on time-varying frequency was proposed and verified by sev-eral field bridge tests. Firstly, the traffic-induced vibration of the pier were collected, and the instantaneous frequency of the pier was extracted based on Wavelet Synchrosqueezed Trans-form. Secondly, the probability distribution of instantaneous frequency was fitted and the scour indicator was defined based on the confidence interval. Field test results showed that the vibration response of the middle part of the pier contains more high-order modal informa-tion than that of the top part. The scour indicator changed significantly for two tested piers with a height of 7.23m and 8.98m, which indirectly verified its sensitivity to the change of free length of piers. For short and medium-span bridges, effective vibration signals can be col-lected by a short test under open traffic conditions. The proposed method can be used for real-time monitoring or rapid detection of bridge scour.
AB - Scour is one of the main hidden diseases of bridge substructure, which will lead to the significant loss of foundation stiffness and bearing capacity. A scour diagnostic method of pile foundation based on time-varying frequency was proposed and verified by sev-eral field bridge tests. Firstly, the traffic-induced vibration of the pier were collected, and the instantaneous frequency of the pier was extracted based on Wavelet Synchrosqueezed Trans-form. Secondly, the probability distribution of instantaneous frequency was fitted and the scour indicator was defined based on the confidence interval. Field test results showed that the vibration response of the middle part of the pier contains more high-order modal informa-tion than that of the top part. The scour indicator changed significantly for two tested piers with a height of 7.23m and 8.98m, which indirectly verified its sensitivity to the change of free length of piers. For short and medium-span bridges, effective vibration signals can be col-lected by a short test under open traffic conditions. The proposed method can be used for real-time monitoring or rapid detection of bridge scour.
UR - https://www.scopus.com/pages/publications/85200423099
U2 - 10.1201/9781003483755-428
DO - 10.1201/9781003483755-428
M3 - 会议稿件
AN - SCOPUS:85200423099
SN - 9781032770406
T3 - Bridge Maintenance, Safety, Management, Digitalization and Sustainability - Proceedings of the 12th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2024
SP - 3625
EP - 3632
BT - Bridge Maintenance, Safety, Management, Digitalization and Sustainability - Proceedings of the 12th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2024
A2 - Jensen, Jens Sandager
A2 - Frangopol, Dan M.
A2 - Schmidt, Jacob Wittrup
PB - CRC Press/Balkema
T2 - 12th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2024
Y2 - 24 June 2024 through 28 June 2024
ER -