| 摘要 |
PROBLEM TO BE SOLVED: To provide the seismically isolated structure, in which the horizontal displacement of the outer circumferential section of a vibration isolated building can be brought close to horizontal displacement at the center of the gravity of the building, by translating the vibration isolation building in the torsional-vibration direction in the case of torsional vibrations by utilizing a hydraulic cylinder arranged in the horizontal direction. SOLUTION: A torsional-vibration controller 1 installed to a vibration isolation layer formed by upper and lower structures is composed of a plurality of the hydraulic cylinders 2 arranged in the horizontal direction and pipings 3 connecting the hydraulic cylinders 2, the insides of the hydraulic cylinders 2 and the pipings 3 are filled with oil, the hydraulic cylinders 2 are arranged in the direction that the cylinders are translated to the torsional vibrations of the upper structure at positions effective for controlling the torsional vibrations of the upper structure to the upper structure in which torsional vibrations are easy to occur, the cylinder sections are mounted on either one structure, a rod section is secured to the other structure, and the pipings 3 mutually connect each hydraulic cylinder 2 so that a plurality of the hydraulic cylinders 2 are operated in the direction that the cylinders are translated to the torsional vibrations of the upper structure.
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