This technology is a cable-supported bridge, such as a cable-stayed or suspension bridge, where multiple pylons are connected to a perpendicular girder by cables. It features dampers installed between the pylons and the girder to attenuate movement when the girder shifts relative to the pylons.
Long-span bridges must control flutter caused by the interaction between bridge vibration and wind. Conventional methods have relied on streamlining the girder cross-section, creating openings, or installing wing-type vibration dampers or TMDs. However, these methods have limitations in increasing the critical flutter wind speed for ultra-long-span bridges exceeding 2km, and they often lead to increased construction costs due to unnecessarily large girder cross-sections.
This technology connects both ends of the damper to rotate around an axis perpendicular to the longitudinal direction of both the pylon and the girder. The dampers are positioned in pairs at the edges of the girder, oriented parallel to the pylon's longitudinal axis. Damping effects can be further enhanced by adding auxiliary dampers between the girder and the piers, as well as elastic stopper members attached to the girder at a distance from the pylons. Applicable to offshore long-span cable-stayed bridges, floating suspension bridges, and bridges in high-wind regions, this solution increases the critical flutter wind speed without modifying the girder cross-section. It also reduces girder end expansion and contraction caused by live and wind loads, thereby extending the service life of expensive components like expansion joints.
N/A
