Calming effect

This article looks at causes of cable vibration in cable-stayed bridges and some countermeasures currently available. Vibration can be caused by vortices shed off the cable; "galloping" where airflow hits the cable to produce an elliptical cross section as the aerodynamic shape; parametric excitation from interactions between the bridge deck or pylons and the cables; and wind- or rain-induced vibrations. Countermeasures include fitting a helical rib, dimples, or longitudinal grooves to the cable surface to reduce effects of wind and rain; the use of cross-ties to shift the natural frequencies of the cable stays and avoid interactions, and the addition of damping devices, typical devices being rubber internal dampers, hydraulic and electromagnetic types, and mechanical friction dampers. Mechanical dampers have long life expectancy and require minimal maintenance.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01051126
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jun 11 2007 1:28PM