Vibration of Inclined Sag Cables with Oil Dampers in Cable-Stayed Bridges

Abstract

This paper presents both free and forced vibration analyses of inclined cables, including the effects of cable sag, equipped with oil dampers in cable-stayed bridges by using a hybrid method recently developed by the writers. The hybrid method readily takes into account cable sag and inclination, damper stiffness and direction, and other parameters. The obtained results confirm that the installation of an oil damper to a stayed cable near the support can increase cable modal damping ratio and thus reduce cable vibration in most cases if the parameters of the damper are properly selected. However, it is found that if the sag parameter λ