Modal control of seismic structures using augmented state matrix

In conventional methods of modal control, the number of controllable struct ural modes is usually restrained by the number of sensors that feedback the structural signals. In this paper a modal control scheme where the feedbac k gain is formulated in an augmented state space is proposed. The advantage of the proposed method is that it increases the number of the controllable modes without adding extra sensors. The method is verified experimentally by an earthquake simulation test with a full-scale building model. The prop osed modal control was also compared with the conventional ones in the test . For the building model tested, the performance of the proposed control wi th only one feedback signal can be as efficient as that of modal control wi th full state feedback. Copyright (C) 2001 John Wiley & Sons, Ltd.