Calming Effect: Reducing Cable Vibrations

This article explains the various phenomena and technology surrounding cable vibration, as observed in medium to long-span cable-stayed bridges. The author describes how vibration occurs in bridges, noting such phenomena as galloping, which is caused by aerodynamic instability involving airflow around an unsymmetrical cross-section. The author also discusses the long-term effects of cable vibration. These can include reduced safety in general or even complete cable failure, due to multiple cycles of bending fatigue stress that accumulate at the anchorages. Countermeasures, including the use of a helical rib on the outside of the cable surface, and supplemental damping devices (e.g., hydraulic dampers, mechanical friction dampers) are discussed.

Language

  • English

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Filing Info

  • Accession Number: 01046514
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 15 2007 5:02PM