Water damping device and method for controlling vortex-induced vibration and fluttering of sea-crossing or river-crossing bridges

A water damping device for controlling vortex-induced vibration and flutter of sea-crossing or river-crossing bridges, comprising a water damping device, wherein the water damping device is connected under a main girder by wire ropes and immersed in the water;

• the water damping device comprises a steel frame and a water-blocking cup, one end of the water-blocking cup is provided with a blocking ring and a water-blocking cup cover, the water-blocking cup cover is mounted between the water-blocking cup and the blocking ring and is movably connected to the water-blocking cup, the blocking ring is used to prevent the water-blocking cup cover from opening towards the outside of the water-blocking cup;
• an array of water-blocking cups is mounted on the steel frame along the downward direction of the water-blocking cup cover;
• further comprising a displacement stroke amplifier, wherein the displacement stroke amplifier is mounted on the bridge tower adjacent to both ends of the main girder and is connected to the water damping device;
• the displacement stroke amplifier comprises a reinforced rigid arm, a solid steel shaft, a small-radius roller, and a large-radius hub;
• one end of the reinforced rigid arm is connected to the bridge tower, and the other end is connected to the small-radius roller;
• the solid steel shaft is embedded in the small-radius roller through balls;
• the large-radius hub and the small-radius roller are coaxially fixed;
• and
• a groove is provided on the outer side of the small-radius roller;
• one end of the wire ropes is wound in the groove on the outer side of the small-radius roller, and the other end is connected to the main girder;
• a groove is provided on the outer side of the large-radius hub;
• one end of the wire ropes is wound in the groove on the outer side of the large-radius hub and the other end is connected to the water damping device.