Seismic control bearing device and seismic control system including the same

Abstract

Provided are a seismic control bearing device capable of absorbing and/or blocking vibration energy transmitted to structures due to earthquakes, and so on, as well as actively controlling various dynamic behaviors generated from the structures with low power and without additional equipment, and a seismic control system including the same. The seismic control bearing device is installed between a ground base and a structure constructed on the ground base to reduce vibration energy applied to the structure, and includes a plurality of deposition members spaced apart from each other; and a plurality of magneto-sensitive members disposed between the deposition members and formed of a magneto-sensitive material. The properties including a stiffness coefficient and an damping coefficient of the magneto-sensitive material are varied depending on a variation of a magnetic field formed around the magneto-sensitive member.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Korean Patent Application No. 10-2006-0052880, filed on Jun. 13, 2006, the disclosure of which is hereby incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a seismic control bearing device and a seismic control system including the same, and more particularly, to a seismic control bearing device installed in structures such as buildings, bridges, and so on, and capable of reducing vibration energy transmitted to the structures by seismic load, and a seismic control system including the same.[0004]2. Description of the Related Art[0005]In recent times, research on seismic isolation devices has been widely attempted to protect structures such as buildings, bridges, and so on, by absorbing and / or blocking vibration energy applied to the structures using additional equipment. A base isolation device such as an e...

AI Technical Summary

Benefits of technology

[0011]In another aspect, the invention is directed to a seismic control system including: a sensing unit for sensing dynamic behavior of a structure and outputting a sensing signal corresponding to dynamic vibration of the structure; a seismic control bearing device installed between the structure and a ground base, on which the structure is constructed, to reduce vibration energy applied to the structure, wherein the seismic control bearing device includes a plurality of deposition members spaced apart from each other; and a plurality of magneto-sensitive members disposed between the deposition members and formed of a magneto-sensitive material; a magnetic field forming unit for generating a variation of a magnetic field in the seismic control bearing device such that the properties including a stiffness coefficient and an damping coefficient of the magneto-sensitive material are varied depending on the variation of the magnetic field; and a control unit for receiving a sensing signal from the sensing unit to control the magnetic field forming unit such that the seismic control bearing device generates a seismiccontrol force for reducing vibration energy of the structure on the basis of the sensing signal.

Problems solved by technology

However, a seismic-resistant design using the seismic isolation device increases a natural frequency of a structure system, constituted of a base isolation device and a structure to increase relative displacement response of the structure, thereby causing disadvantages in usability and design of the base isolation device.

In addition, it is known that the above seismic-resistance design is inappropriate for broad input earth movement due to dynamic characteristics having strong non-linearity.

For example, a base isolation device designed for the El Centro Earthquake may not show seismic isolation performance when a predominant frequency of seismic load is varied, a seismic center is near, a wave velocity is fast, and a seismic cycle is large, like the Mexico City earthquake.

However, addition of the active controller can increase costs because of high-capacity external power, and it is difficult to obtain reliability of equipment for a long time.

However, as shown in FIG. 2, since the semi-active controller, for example, the MR fluid damper 2, should be installed with the base isolation device such as the lead rubber bearing 1, it is difficult to adapt the MR fluid damper to an actual structure for economic reasons.

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