Large-span bridge composite multi-directional wind-resistant and anti-seismic shock absorber and working method thereof

Abstract

The invention discloses a large-span bridge composite multi-directional wind-resistant and anti-seismic shock absorber and a working method thereof. The large-span bridge composite multi-directional wind-resistant and anti-seismic shock absorber comprises a tubular shell, a steel shaft with the length being larger than that of the tubular shell is arranged in the tubular shell, one end of the steel shaft extends out of the end of the tubular shell, and the other end of the steel shaft is provided with a piston plate clamped in the tubular shell; one end of the tubular shell is of a sealed structure, and the end of the sealed structure is provided with a universal hinge for being connected with a bridge pier; the other end of the tubular shell is provided with a cover plate, and a hole allowing the steel shaft to penetrate through is formed in the center of the cover plate; and three or more sections of damping cavities are formed in the tubular shell in the axis direction of the tubular shell, and are the first damping cavity located between the sealed structure of the tubular shell and the piston plate, the second damping cavity located between the piston plate and an annular partition plate and the third damping cavity located between the annular partition plate and the cover plate correspondingly. The shock absorber has an obvious energy consumption effect on vibration, generated by a bridge, with the high and low frequency and the large and small amplitude values, assembly-type connection is adopted, and dismounting, mounting and maintenance are convenient.

Description

technical field [0001] The present invention mainly relates to the field of dampers, in particular to a long-span bridge composite multi-directional wind-resistant and shock-resistant shock absorber and its working method. Pedestrian vibration, temperature expansion and contraction, earthquake excitation, etc. can play a very good inhibitory role. Background technique [0002] The span of bridge structures has become larger and larger with the development of the times, and the service environment has become more harsh. Whether it is common loads such as pedestrian crossing, vehicle operation, vehicle braking, wind and rain-induced vibration, or occasional loads such as hurricanes and earthquakes, they often It causes the main girder to vibrate along the direction of the bridge, and causes a series of engineering problems, such as excessive longitudinal swing of the main girder, excessive bending moment at the bottom of the tower pier, and even tilting of the tower column and...

AI Technical Summary

Problems solved by technology

The damping force of displacement-related shock absorbers is mainly affected by the vibration displacement amplitude. They start to consume vibration energy after breaking through the elastic limit. The common ones are metal or friction shock absorbers, but they are not suitable for certain small displacement amplitudes and high frequencies. The damping effect of the vibration is poor; the damping force of the speed-dependent damper is mainly affected by the vibration speed, they can dissipate energy when the vibration is small, but the performance is often affected by the working temperature, and it is easy to Problems such as leakage or damage to damping materials occur

Moreover, the limit method adopted by the current shock absorber is often that the shock absorber is suddenly locked after the set displacement is exceeded. This hard limit method often has an impact on the upper structure of the bridge.

Finally, the current bridge shock absorbers have problems such as leakage and fatigue damage. They have a short service life and are not easy to disassemble and repair. If the shock absorber is damaged, it often needs to be replaced as a whole, which increases the cost of use and limits the wide range of shock absorbers in the bridge field. application

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