Damping vibration attenuation device for controlling vortex-induced vibration of large-span bridge girder

Abstract

The invention relates to the technical field of bridge engineering, and discloses a damping vibration attenuation device for controlling vortex-induced vibration of a large-span bridge girder, which comprises a rigid arm arranged on a bridge pier column in the transverse direction of a bridge, and one end of the rigid arm is hinged with the bridge pier column; a viscous damper, wherein one end of the viscous damper is hinged to the bridge pier stud, the other end of the viscous damper is hinged to the rigid arm, and the viscous damper and the rigid arm are not collinear; and a connecting device which is arranged between the bridge girder and the rigid arm and is used for connecting the bridge girder with the rigid arm. The device has the following advantages and effects that firstly, vortex-induced vibration of the main beam is controlled by arranging an amplification structure formed by the viscous damper and the rigid arm; and secondly, the amplifying device formed by combining the connecting device, the rigid arm and the viscous damper can adapt to broad-spectrum vibration frequency, so that the device is wide in bridge application range, large in span, reliable in transmission displacement, clear in structural stress and capable of controlling multi-order vortex-induced vibration of the main beam.

Description

technical field [0001] The application relates to the technical field of bridge engineering, in particular to a damping and vibration reduction device for controlling vortex-induced vibration of a main girder of a long-span bridge. Background technique [0002] In recent years, vortex-induced vibrations of long-span bridges have occurred frequently. In only half a year in 2020, wind-induced vortex-induced vibrations have occurred in the Yingwuzhou Yangtze River Bridge, Humen Bridge, and Zhoushan Xihoumen Bridge. Among them, the Humen Bridge lasted 10 days from traffic control to traffic restoration due to vortex induced vibration, which had a great impact on the normal operation of urban traffic. Although vortex-induced resonance is a limited amplitude vibration, it will not cause the collapse of the structure, but if the vibration amplitude is too large, it will cause psychological discomfort to pedestrians and vehicle drivers; in addition, long-term vortex-induced vibratio...

AI Technical Summary

Problems solved by technology

Although this device can transfer and amplify the structural displacement of the bridge to the damper to improve the energy dissipation efficiency of the damper, on the one hand, the damper ball joint is fixed on the beam column, and the column structure is not common in general long-span bridges , so its applicable bridge structure is limited; on the other hand, the displacement amplification function is realized through rigid rods, resulting in too large cross-section of rods and complicated connection structure

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