Electromagnetically controlled friction pendulum shock-reducing device and control method

Abstract

The invention discloses an electromagnetically controlled friction pendulum vibration reduction and isolation device and control method. The electromagnetically controlled friction pendulum vibrationreduction and isolation device and control method comprises a horizontal vibration isolation unit and a vertical vibration isolation unit; in the horizontal vibration isolation unit, a lower cover plate of a common friction pendulum supporting seat is connected with a lower column, the lower column is connected with a base, the upper cover plate of the friction pendulum is connected with an uppercolumn; and in the vertical vibration isolation unit, an electromagnet is embedded between the upper and lower columns of the upper and lower cover plates connecting the friction pendulum and is connected with the control system at the same time, and coils in the electromagnet are connected with the control system through wires. According to feedback information of a displacement sensor and a pressure sensor on the control system, a computer can automatically control the electromagnet correspondingly, the structure of the electromagnet can be reset after an earthquake action by the electromagnet through attracting or repelling, the pull-out capacity is improved, and overturning and even collapse of a building are weakened, the collision damage of a sliding block to a limiting ring is alsogreatly weakened, and the problems of the variability and residual displacement of friction coefficients in an existing friction pendulum are solved; and seismic energy can be consumed more effectively, and a superstructure is more stable and safer.

Description

technical field [0001] The invention relates to an earthquake reduction and isolation technology. Background technique [0002] Earthquake is a very destructive natural disaster. According to statistics, there are more than 5 million earthquakes every year on the earth. Earthquakes can cause a large number of casualties and the collapse of buildings will cause huge losses to human life and property. . But the current level of science and technology is still unable to predict the arrival of earthquakes, we can only take some measures, such as installing shock-absorbing and isolation devices, to minimize the damage caused by earthquakes. [0003] Seismic isolation is to reduce or isolate the impact on buildings caused by earthquakes. Seismic control is to change the dynamic characteristics of the structure by configuring some kind of mechanism equipment in a specific part of the structure, and dissipate the seismic energy that has been input into the structural system. Seis...

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Problems solved by technology

[0004] In recent years, with the development of civil engineering, many methods of seismic isolation have been derived. Among them, the friction pendulum isolation bearing is a friction pendulum isolation bearing developed by the US Earthquake Protection Systems Corporation in the 1980s. The main principle of seismic isolation and energy dissipation of the pendulum isolation support is to use the design of the sliding surface to prolong the vibration period of the structure to greatly reduce the amplification effect of the structure caused by the earthquake. In addition, the friction pendulum isolation support can also be used The friction between the sliding surface of the seat and the slider is used to consume seismic energy and reduce the seismic input. However, as the product of the friction pendulum isolation support is put into use, some problems about the product are also exposed. From the actual The problems reflected in the process of use are: (1) When a vertical earthquake occurs or the structure is subjected to a large vertical excitation, the building structure will have a certain vertical upward pull force relative to the ground, thus causing the building's overturned or even collapsed

It is found from the experiment that the friction coefficient between the slider and the slideway is related to factors such as sliding speed, temperature and upper gravity, and the variability of the friction coefficient reduces the effectiveness of the friction pendulum when it is working.

(3) When an earthquake occurs, the residual displacement of the friction pendulum exists, the seismic excitation is small, or when the self-weight of the upper building is insufficient, the friction pendulum support cannot be completely reset

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