Application of H.INF. Controlled Hybrid Mass Damper to an Actual High-rise Building.

Abstract

Robust control based on the H∞ control theory has been applied to the control of hybrid mass damper system installed on an actual 23-story building known by the name of J-City Tower in Tokyo, with the view of reducing simultaneously bending in two horizontal directions and torsional oscillations induced by strong winds and moderate earthquakes. Identification modal parameters resulted from building excitation tests, conducted by using mass damper system as excitation device, were adopted for the control system design, to ensure both damping effect of the 1st bending/torsional mode and robust stability for higher modes over the 2nd. After installation of the H∞ controller, excitation test results confirmed that this system has provided control effect satisfying largely what was aimed in design, and that good agreement has been obtained between measured and calculated results. Furthermore, system performance has been recorded continually, and analysis of observation data during earthquake has proved that this system has been actuated effectively.