An eddy current energy dissipation and vibration reduction type bridge expansion joint device

Abstract

The invention discloses an eddy current energy dissipation and vibration reduction type bridge expansion joint device, which comprises a pre-embedded steel plate, a metal comb plate, an eddy current energy dissipation and vibration reduction mechanism and a magnetic shielding mechanism. The eddy current energy dissipation and vibration reduction mechanism includes a permanent magnet assembly and a conductor plate; a permanent magnet assembly is installed at the bottom of each comb of the metal comb plate; each permanent magnet assembly includes several permanent magnets with alternating polarities; The conductor plate is installed in the expansion joint directly below the permanent magnet assembly; the magnetic shielding mechanism is used for magnetic isolation. The invention is based on the eddy current effect. The permanent magnets are interlaced and fixed on the bottom of the metal comb plate, and when the relative displacement occurs with the vibration of the bridge, the conductor plate will generate an eddy current due to cutting the magnetic induction line, and an opposite damping force will be generated in the conductor plate to weaken The vibration response of the main girder can consume the energy of the bridge vibration through the resistance thermal effect, and finally achieve the effect of energy dissipation and vibration reduction. At the same time, it can also effectively control bridge vibration and in-plane deflection caused by dynamic loads such as vehicles, strong winds, and earthquakes.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to an eddy current energy dissipation and vibration reduction type bridge expansion joint device. Background technique [0002] Expansion joints are one of the important connection structures of bridges, and their main function is to realize the connection between bridges or bridges and abutments, and to ensure the integrity and smoothness of the bridge along the direction of the bridge. At the same time, expansion joints can effectively adapt to the deformation of the bridge structure under the influence of external environment such as temperature and vehicles, and effectively guarantee the basic functions of the bridge during long-term service and the stability and safety of vehicles passing through the bridge junction. However, since expansion joints are exposed to the natural environment for a long time and directly bear the impact of vehicle loads, they are extremely prone to ...

AI Technical Summary

Problems solved by technology

However, due to the viscous liquid encapsulated in the damper, it has higher requirements on sealing and ambient temperature

In addition, the start-up of the viscous damper needs to overcome the large frictional resistance first, which restricts the control effect of the viscous damper on the longitudinal displacement of the bridge.

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