Galloping analysis of a stay cable with an attached viscous damper considering complex modes

Cung H Nguyen*, John H G Macdonald

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
235 Downloads (Pure)

Abstract

The use of viscous dampers to mitigate cable vibrations on cable-stayed bridges is very popular. A viscous damper attached to a stay cable results in complex mode shapes. Such complexity could affect the dynamic stability of the cable under wind action, yet it is neglected in conventional galloping analysis. A general framework to investigate the problem of galloping of a stay cable with an attached viscous damper is therefore developed. Aerodynamic forces on the complex modes are considered, including aeroelastic coupling between the modes. A numerical example for an ice-accreted stay cable with a damper shows that conventional galloping analysis overestimates the critical wind speed for galloping occurrence. The complexity of the mode shapes gives rise to the cable being more unstable than ignoring it by treating the mode shapes as real.

Original languageEnglish
Article number04017175
Number of pages9
JournalJournal of Engineering Mechanics
Volume144
Issue number2
Early online date7 Dec 2017
DOIs
Publication statusPublished - 1 Feb 2018

Keywords

  • Galloping
  • Complex mode
  • Viscous damper
  • Cable dynamics
  • Cable-stayed bridges
  • Quasi-steady theory
  • Aeroelasticity
  • Dynamic stability

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