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.

1 . A seismic control bearing device installed between a ground base and a structure constructed on the ground base to reduce vibration energy applied to the structure, comprising:
 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,   wherein properties of 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.   
   
   
       2 . The seismic control bearing device according to  claim 1 , wherein the magneto-sensitive material comprises a rubber matrix formed of rubber, and metal particles dispersed in the rubber matrix. 
   
   
       3 . The seismic control bearing device according to  claim 2 , wherein the metal particles are iron particles. 
   
   
       4 . The seismic control bearing device according to  claim 3 , wherein the deposition member is formed of a plate-shaped metal material, and the magneto-sensitive member has a plate shape. 
   
   
       5 . The seismic control bearing device according to any one of  claims 1  to  4 , further comprising a core member passing through the deposition members and the magneto-sensitive members and formed of a metal material. 
   
   
       6 . A seismic control system comprising:
 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 comprises 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 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 seismic control force for reducing vibration energy of the structure on the basis of the sensing signal.   
   
   
       7 . The seismic control system according to  claim 6 , wherein the magneto-sensitive material comprises a rubber matrix formed of rubber, and metal particles dispersed in the rubber matrix. 
   
   
       8 . The seismic control system according to  claim 7 , wherein the bearing device further comprises a core member passing through the deposition members and the magneto-sensitive members and formed of a metal material. 
   
   
       9 . The seismic control system according to any one of  claims 6  to  8 , wherein the sensing signal comprises displacement, acceleration, and a vibration cycle of the structure. 
   
   
       10 . The seismic control system according to any one of  claims 6  to  8 , wherein the magnetic field forming unit comprises an annular coil member disposed to surround the seismic control bearing device, and a current supply part for supplying current to the coil member to form a magnetic field around the coil member. 
   
   
       11 . The seismic control system according to  claim 10 , wherein the control unit controls strength of the magnetic field formed by the magnetic field forming unit by controlling an amount of current supplied from the current supply part.