Damper vibration reduction system for restraining vertical vibration of bridge girder

Abstract

The invention belongs to the field of vibration control, and particularly relates to a damper vibration reduction system for restraining vertical vibration of a bridge girder. The damper vibration reduction system comprises a bridge pier tower and the bridge girder, and further comprises a torsional damper connected to the bridge pier tower, the torsional damper is connected with a rotating shaftfor driving the torsional damper to output damping force, a first connecting rod is connected to the rotating shaft, the rotating shaft and the first connecting rod can rotate together, a second connecting rod is hinged to the end, away from the rotating shaft, of the first connecting rod, the second connecting rod is hinged to the bridge girder, and the first connecting rod is longitudinally arranged along the bridge girder. The damper vibration reduction system for restraining the vertical vibration of the bridge girder can be used for controlling the vertical vortex vibration of a stiffening girder of a suspension bridge, and can adapt to longitudinal deformation and torsional motion of the stiffening girder.

Description

technical field [0001] The invention belongs to the field of vibration control, and in particular relates to a damper vibration reduction system for suppressing vertical vibration of a bridge girder. Background technique [0002] At present, the vertical bending modes of long-span suspension bridges are dense, the natural damping ratio is low, and vertical eddy vibrations may occur in the vertical bending modes with natural frequencies of 0.1-0.7 Hz, and the corresponding onset wind speed is 3.5-23 m / s. As the wind speed increases, vortex vibration occurs in multiple modes of the stiffened beam successively, and a specific wind speed corresponds to a vortex vibration in one mode, which is called multi-order vortex vibration phenomenon. For example, in the first half of 2020, my country's Wuhan Yingwuzhou Bridge, Guangdong Humen Bridge and Zhoushan Xihoumen Bridge successively experienced large-amplitude multi-mode vortex vibrations, which affected the normal operation of the...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for suppressing the vertical vibration of the main girder of the bridge in view of the problem that the energy dissipation device used for the vertical vortex vibration control of the stiffened girder of the suspension bridge cannot adapt to the longitudinal deformation and torsional movement of the stiffened girder in the prior art. The damper vibration reduction system

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