Abstract
Viscous dampers are used widely to mitigate cable vibrations cable-stayed bridges. A damper attached to a stay cable leads to complex modes. The complexity can highly affect the aeroelastic stability of the cable. A galloping instability analysis of cable with an attached damper will be presented. A numerical example points out errors of conventional galloping analysis. The complexity of the mode shapes leads the cable being more unstable than ignoring it by treating the mode shapes as real.
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