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Vol. 48 (2007) No. 3 December n. 155


Cable Vibrations Caused by Moving Loads in Cable-Stayed Bridges

< Table of Contents for Vol. 48 (2007) No. 3 December n. 155
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 48 (2007) No. 3 December n. 155
  • Pages: 181-196
  • Title: Cable Vibrations Caused by Moving Loads in Cable-Stayed Bridges
  • Author(s): Y. B. Yang, L. J. Chen and C. W. Lin
  • Keywords: cable-stayed bridge, detuning, flexural rigidity, moving load, tuning, support motion, stay cable
Abstract
This paper investigates the direct link between the cable vibration of a cable-stayed bridge and the vehicle loads moving over the bridge, a problem not thoroughly studied before. The analysis is conducted in two stages. In the first stage, the vibrations of the two anchor points of each cable of the bridge are obtained from the finite element analysis for the entire bridge under the moving loads. In the second stage, the support motions obtained above are used as the input excitations and the vibration of each cable is solved from the associated governing differential equation, considering the effect of initial tension and flexural rigidity. The effect of cable’s tautness is evaluated for justifying the theory used. For the detuned case, i.e., when the cable frequency is separate from the bridge frequencies, the cable response is dominated by both the bridge and cable frequencies. For the tuned case, i.e., when the cable frequency coincides with any bridge frequency, resonance will occur on the cable. The results presented herein are useful for the design of bridge cables aimed at vibration reduction.

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