Abstract
In this study, dynamic response analyses using sinusoidal input waves were conducted to investigate the effect of long period ground motions on the dynamic behavior of a long-span suspensnion bridge and the effectiveness of viscous dampers. It was found that resonance of the stiffened girder was generated by the sinusoidal input waves with the same frequencies of certain lower modes. Viscous dampers installed between the stiffened girder and the tower were found to be effective to reduce the resonance response in the longitudinal direction.
