Damage Detection of Tension Pendulums in Cable-Stayed Bridges Using Structural Frequency Variance
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 1
Abstract
Structural health monitoring represents an efficient way to diagnose the condition of cable-stayed bridges. Most studies assessing the condition of cable-stayed bridges and detecting damage to them have been developed to monitor the longitudinal performance of bridge bearings. However, few studies have aimed to detect the damage to tension pendulums, which are usually tie-down cables that resist girder uplift from auxiliary piers. This study aims to develop an effective method for detecting the damage of tension pendulums in cable-stayed bridges using structural modal frequencies. First, the sensitivity of the bridge frequency to tension pendulum damage is derived according to the Rayleigh method. Then, a finite-element simulation of a cable-stayed bridge is conducted to validate the rationality of the frequency index. Finally, a case study on tension pendulum damage is carried out for the cable-stayed Yonghe Bridge. The results indicate that the frequency change is far more sensitive to the damage of the tension pendulums than to the damage of the stay cables. The failure of tie-down cables will result in a substantial decrease in the bridge frequency, up to approximately 35% for the first vertical bending mode of the bridge. In practice, the damage of tension pendulums can be effectively detected by a sudden decrease in the measured frequency of cable-stayed bridges.
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Data Availability Statement
All the data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This research work was jointly supported by the National Natural Science Foundation of China (Grants Nos. 51625802, 51978128, and 51708088), the LiaoNing Revitalization Talents Program (Grant XLYC1802035), and the Foundation for High Level Talent Innovation Support Program of Dalian (Grant No. 2017RD03).
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Published In
Journal of Performance of Constructed Facilities
Volume 35 • Issue 1 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 7, 2020
Accepted: Jul 27, 2020
Published online: Oct 24, 2020
Published in print: Feb 1, 2021
Discussion open until: Mar 24, 2021
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