Reduction of cable vibrations in a cable stayed bridge under biharmonic excitation

2019 ◽  
Vol 189 ◽  
pp. 1-10 ◽  
Author(s):  
Wojciech Pakos ◽  
Jacek Grosel
Keyword(s):  
Cable Stayed Bridge ◽  
Cable Vibrations

scholarly journals Full-Scale Measurements and System Identification on Sutong Cable-Stayed Bridge during Typhoon Fung-Wong

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Hao Wang ◽  
Tianyou Tao ◽  
Tong Guo ◽  
Jian Li ◽  
Aiqun Li
Keyword(s):  
Damping Ratio ◽  
Wind Tunnel Test ◽  
Full Scale ◽  
Structural Vibration ◽  
Stay Cable ◽  
Characteristic Analysis ◽  
Random Decrement Technique ◽  
Cable Stayed Bridge ◽  
Vibration Responses ◽  
Cable Vibrations

The structural health monitoring system (SHMS) provides an effective tool to conduct full-scale measurements on existing bridges for essential research on bridge wind engineering. In July 2008, Typhoon Fung-Wong lashed China and hit Sutong cable-stayed bridge (SCB) in China. During typhoon period, full-scale measurements were conducted to record the wind data and the structural vibration responses were collected by the SHMS installed on SCB. Based on the statistical method and the spectral analysis technique, the measured data are analyzed to obtain the typical parameters and characteristics. Furthermore, this paper analyzed the measured structural vibration responses and indicated the vibration characteristics of the stay cable and the deck, the relationship between structural vibrations and wind speed, the comparison of upstream and downstream cable vibrations, the effectiveness of cable dampers, and so forth. Considering the significance of damping ratio in vibration mitigation, the modal damping ratios of the SCB are identified based on the Hilbert-Huang transform (HHT) combined with the random decrement technique (RDT). The analysis results can be used to validate the current dynamic characteristic analysis methods, buffeting calculation methods, and wind tunnel test results of the long-span cable-stayed bridges.

scholarly journals Numerical Study of the Active Tendon Control of a Cable-Stayed Bridge in a Construction Phase

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
M. H. El Ouni ◽  
N. Ben Kahla
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Force Feedback ◽  
Numerical Study ◽  
Element Model ◽  
Small Scale ◽  
Cable Stayed Bridge ◽  
Displacement Sensors ◽  
Out Of Plane ◽  
Cable Vibrations

This paper investigates numerically the active tendon control of a cable-stayed bridge in a construction phase. A linear Finite Element model of small scale mock-up of the bridge is first presented. Active damping is added to the structure by using pairs of collocated force actuator-displacement sensors located on each active cable and decentralized first order positive position feedback (PPF) or direct velocity feedback (DVF). A comparison between these two compensators showed that each one has good performance for some modes and performs inadequately with the other modes. A decentralized parallel PPF-DVF is proposed to get the better of the two compensators. The proposed strategy is then compared to the one using decentralized integral force feedback (IFF) and showed better performance. The Finite Element model of the bridge is coupled with a nonlinear cable taking into account sag effect, general support movements, and quadratic and cubic nonlinear couplings between in-plane and out-of-plane motions. Finally, the proposed strategy is used to control both deck and cable vibrations induced by parametric excitation. Both cable and deck vibrations are attractively damped.

scholarly journals A Field Investigation on Vortex-Induced Vibrations of Stay Cables in a Cable-Stayed Bridge

2019 ◽  
Vol 9 (21) ◽  
pp. 4556 ◽  
Author(s):  
Wen-Li Chen ◽  
Donglai Gao ◽  
Shujin Laima ◽  
Hui Li
Keyword(s):  
Estimation Method ◽  
Field Investigation ◽  
Vibration Modes ◽  
Cable Stayed Bridge ◽  
Stay Cables ◽  
Vortex Induced Vibrations ◽  
Mean Wind Speed ◽  
The Mean ◽  
Cable Vibrations ◽  
The Relationship

A field study was conducted to identify the vortex-induced vibrations (VIVs) of stay cables in a cable-stayed bridge. A full-scale health-monitoring system was established to observe the wind effects of the selected cables. The vibration amplitudes in the twenty selected stay cables were first studied. The results indicate that only cable CAC20 has large amplitudes with a multimode and high-frequency vibration in the investigated period. The correlation between the wind and cable vibration was subsequently investigated. The large vibration amplitudes are primarily located in the mean speed scope of 4 to 6 m/s, simultaneously close to the reduced velocity of five when the wind was almost perpendicular to the bridge axis and had a smaller turbulence intensity. Moreover, the relationship between the maximum vibration amplitude with the mean wind speed was fitted by a function that was validated by the measured data. Finally, an estimation method was presented to predict the participative vibration modes that would happen in the VIVs of the stay cables, according to the known wind and cable parameters. The measured cable vibrations were employed to validate this estimation method. The results indicate the estimated vibration modes are close to the measured vibration modes.

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