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Smart Structures and Systems
  Volume 23, Number 6, June 2019 , pages 683-693
DOI: https://doi.org/10.12989/sss.2019.23.6.683
 


Monitoring and control of wind-induced vibrations of hanger ropes of a suspension bridge
Xu G. Hua, Zheng Q. Chen, Xu Lei, Qin Wen and Hua W. Niu

 
Abstract
    In August 2012, during the passage of the typhoon Haikui (1211), large amplitude vibrations were observed on long hangers of the Xihoumen suspension Bridge, which destroyed a few viscoelastic dampers originally installed to connect a pair of hanger ropes transversely. The purpose of this study is to identify the cause of vibration and to develop countermeasures against vibration. Field measurements have been conducted in order to correlate the wind and vibration characteristics of hangers. Furthermore, a replica aeroelastic model of prototype hangers consisting of four parallel ropes was used to study the aeroelastic behavior of hanger ropes and to examine the effect of the rigid spacers on vibration mitigation. It is shown that the downstream hanger rope experiences the most violent elliptical vibration for certain wind direction, and the vibration is mainly attributed to wake interference of parallel hanger ropes. Based on wind tunnel tests and field validation, it is confirmed that four rigid spacers placed vertically at equal intervals are sufficient to suppress the wake-induced vibrations. Since the deployment of spacers on hangers, server hanger vibrations and clash of hanger ropes are never observed.
 
Key Words
    suspension bridge; hangers; wake-induced vibrations; vibration control
 
Address
Xu G. Hua, Zheng Q. Chen, Qin Wen and Hua W. Niu: Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering,
Hunan University, 410082 Changsha, China
Xu Lei: Power Research Science Institute of Guangdong Power Grid, 510000 Guangzhou, China
 

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