Automatic Identification and Characteristic Analysis of Vortex-induced Vibration of Stay Cables based on Structural Health Monitoring Data
Vortex-induced vibration(VIV)is one of the typical abnormal vibrations of stay cables.In order to explore the characteristics of vortex-induced vibration of stay cables,the monitoring data of 12 stay cables of a cable-stayed bridge for one month are analyzed.The correlation between VIV and environmental factors are analyzed,and the characteristics of service status of stay cables are discussed through the spatio-temporal distribution characteristics of vortex-induced vibration.Firstly,an automatic identification method for VIV of stay cables is used to identify three vibration status,which are random vibration,forming of VIV and stable VIV.Then,the correlation between VIV of stay cables and wind speed and wind direction are analyzed,and the evolution of vibration amplitude of VIV are also analyzed.Finally,the spatio-temporal distribution characteristics of VIV of 12 stay cables are compared,and the possible condition evaluation of 12 stay cables are presented based on the statistical results.The results show that VIV has a strong correlation with wind speed and direction,but the wind with specific speed and direction does not certainly lead to VIV of stay cables.The amplitude distribution of VIV of stay cables is wide,and small amplitude VIV and large amplitude VIV are both observed.Using indices such as specific wind speed,wind direction and root mean square of acceleration do not lead to correct identification results.The spatiotemporal distribution characteristics of VIV of cables in symmetric locations of the analyzed bridge are different,which indicates that the service condition of the stay cables(damping systems)in symmetric locations are different.The analysis results provide a reference for monitoring and maintenance of stay cables.
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