Permanent magnet tuning mass damping device used for bridge expansion joint damage control

Abstract

The invention discloses a permanent magnet tuning mass damping device used for bridge expansion joint damage control. The permanent magnet tuning mass damping device used for bridge expansion joint damage control comprises a mass block, permanent magnets which are distributed on the inner side and the outer side of the mass block and are covered with graphene coatings, an inner copper plate, an outer copper plate and a plurality of springs; the positions of the inner copper plate and the outer copper plate are fixed, the mass block is suspended on an upper fixed plate of the device through the springs, and when a box beam horizontally vibrates, the mass block swings, and the inner copper plate cuts a magnetic induction line generated by the permanent magnet on the inner side of the mass block; when the box beam vertically vibrates, the mass block vertically moves, the outer copper plate cuts a magnetic induction line generated by the permanent magnet on the outer side, and vibration energy is dissipated through the resistance heat effect of the copper plates. The device is simple in structure and convenient to mount, the defect that oil leakage appears in a traditional viscous fluid damping device is overcome, the service life of the damping device is greatly prolonged, the device damping efficiency is improved, in addition, the damping device can control beam end horizontal and vertical displacement at the same time, the expansion joint distorted destruction probability caused by the beam end corners is greatly reduced, and generation and development of the expansion joint damage are controlled.

Description

technical field [0001] The invention specifically relates to a permanent magnet tuning mass damping device used for bridge expansion joint disease control. It relates to the technical field of civil engineering vibration control. Background technique [0002] The expansion joint is an important part of the bridge structure, and its function is to enable the bridge to expand and contract freely under the influence of temperature changes, driving and wind without producing binding force. Due to the direct bearing of repeated vehicle loads and long-term exposure to the atmosphere, the use environment is harsh, making the expansion joint the weakest part of the bridge structure, and its service life is far less than the design value, which directly leads to a large amount of maintenance and replacement costs. [0003] According to statistics from the United States, the average life span of expansion joints in bridges is 10 to 15 years, which is much lower than the design life o...

AI Technical Summary

Problems solved by technology

[0008] Technical problem: In order to solve the problem of premature failure of expansion joints caused by small and rapid vibrations of expansion joints caused by wind and vehicle loads, this invention provides a permanent magnet tuned mass damping device for bridge expansion joint disease control, which overcomes the existing sticky The disadvantage of the hysteresis damper is that the magnetic induction lines can be cut in different directions, thereby effectively reducing the vibration of the bridge expansion joints in all directions, and greatly reducing the probability of distortion and damage of the expansion joints caused by the beam end angle.

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