Abstract
The long period oscillations during long period earthquake have been considered in the high-rise building since Mid Niigata Prefecture Earthquake in 2004 and its countermeasure is required. The application of the active mass damper to the seismic responses has been studied. The active mass damper is constituted of moving mass and controller, and is controlled based on the oscillation signal detected by the sensor. This system has been mainly used for the wind-induced vibrations and most of the systems installed into the real buildings before have seemed to be locked in the moving mass movements even in the relatively small earthquakes. This paper deals with the activity concerning the seismic response control using the active control mass dampers. The full-active type needless of spring and damping mechanism is proposed. At first, the full-active mass damper is described in the general idea and the linear motor driven system is introduced as a real system suitable for the seismic response control. Next, after the control method of the seismic response is briefly described, the real system monitored data during the 2011 off the Pacific coast of Tohoku Earthquake is introduced and the mass damper performance is evaluated.
