VIBRATION DAMPER FOR TOWER-SHAPED STRUCTURE

PURPOSE: To actively limit by controlling a linear motor based on information from a deformed state detection sensor by providing the linear motor vertically moving by a magnetic coil between engagement pieces projectively provided on an outer peripheral surface of a tower structure. CONSTITUTION: Grille-like engagement pieces 4 are projectively provided in the longitudinal and lateral directions on an outer peripheral surface of a tower structure 1, and linear motors 6 are respectively provided to straddle over and to be engaged with a guide rail 10 vertically arranged on the outer peripheral surface. Ducts 14, 15 to pass light of an optical fiber gyro 2 or an optical fiber sensor 3, an electric wire of the motor 6, etc., are provided on an outer surface of the structure 1, and the other end of the sensor 3 is connected to an optical sensor. Earthquake input is detected by the sensor 3, a displacement position and displacement quantity of the structure are confirmed, the motor 6 to be an object is selected through a control device and driven, and force in the opposite direction of bending stress is applied to the engagement pieces 4. Consequently, it is possible to actively attempt damping.