Abstract
Even though the aerodynamic derivatives associated to lateral motion is much smaller than the other derivatives associated to vertical and torsional motion, the results of Akashi Strait Bridge full scale model tests show better fitting to the results of 3DOF (vertical, lateral and torsional motion) flutter analysis than those of 2DOF (vertical and torsional motion) flutter analysis. In this study, the effects of lateral motion is investigated by using 3DOF or multi-mode step-by-step analysis. In consequence, the flutter of Akashi Strait Bridge can be characterized by aerodynamically 2DOF coupling and structural coupling between lateral and torsional motion, and can be described by 2DOF aerodynamic forces.
