| 摘要 |
PURPOSE:To suppress any shaking on vibratory movement in any mode caused by earthquake applied to a structure of which base is isolated. CONSTITUTION:In base isolation device 7 which is interposed between a base 2 and a structure 5 and which can absorb the energy of shaking on oscillation of the ground, a lower flange 9 is connected to the base 2 and an upper flange 9a is connected to the structure 5. A cylinder is composed of doughnut-like steel discs 9d and doughnut-like resilient discs 9e which are alternately stacked one upon another. A damper body 9c charged therein with electric viscous fluid 9i, is provided so that the lower and upper flanges 9b, 9a may be positionally shifted from each other in a horizontal direction, and the electric viscous fluid 9i may be deformed. Further, an energizing device 10 for creating an electric field in the damper body 9c and the electric viscous fluid 9i is connected thereto with a voltage control device 11 for controlling the intensity of the field, which is in turn connected thereto with an oscillation sensor 12 for detecting oscillation. |
