Water body damping device and method for controlling vortex vibration and flutter of cross-sea and cross-river bridge

Abstract

The invention discloses a water body damping device and method for controlling vortex vibration and flutter of a cross-sea and cross-river bridge. The water body damping device comprises a water body damping device, and the water body damping device is connected to the lower portion of a main beam through a steel cable and immersed in water; the water body damping device comprises a steel frame and water resistance cups, one end of each water resistance cup is provided with a blocking ring and a water resistance cup cover, the water resistance cup cover is arranged between the water resistance cup and the blocking ring and movably connected with the water resistance cup, and the blocking ring is used for blocking the water resistance cup cover from being opened towards the outside of the water resistance cup; the multiple water resistance cups are arranged on the steel frame in the direction that the water resistance cup covers face downwards. The action force between the water resource under the bridge and the device is utilized to hinder the movement of the main beam, and the effect of restraining vortex vibration or soft flutter of the bridge is achieved. The control effect of controlling multi-order vortex vibration can be achieved by installing the water damping devices at different bridge span lengths. The underwater device is folded in daily bridge operation, and underwater navigation and the attractiveness of the bridge are not affected.

Description

technical field [0001] The invention relates to the technical field of vibration reduction control of building structures, in particular to a water body damping device and method for controlling eddy vibration and flutter vibration of bridges crossing seas and rivers. Background technique [0002] Long-span bridges are more sensitive to wind due to their large span and low structural soft damping. When the wind flows through the section of the main girder, the vortex shedding will occur on the downstream side of the main girder, and will generate alternating up and down forces on the bridge. As the wind speed increases, the frequency of vortex shedding also increases. When the shedding frequency is close to the natural frequency of the main girder, the vortex induced resonance phenomenon of the main girder structure will be caused. Although the vortex-induced vibration is a limited vibration and does not produce divergent vibration like flutter and galloping, the vortex-ind...

AI Technical Summary

Problems solved by technology

Passive measures are to appropriately change the shape of the bridge or add some devices (such as deflectors, dampers, vortex screens, etc.) without changing the structure and function of the bridge, so as to obtain a bridge with good wind resistance However, due to the complexity of the flow around the bridge section, passive aerodynamic measures do not have the universality of eddy vibration control, and cannot be adjusted in real time according to the movement posture of the main girder and the change of the flow environment, and the control effect cannot reach the best state

In addition, there is a size effect in the scale model test in the wind tunnel test, so the control effect in the real environment needs to be observed and verified

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