Seismic test of modal control with direct output teedback for building structures

In this paper, modal control with direct output feedback is formulated in a systematic manner<br />for easy implementation. Its application to the seismic protection of structural systems is verified by a<br />shaking table test, which involves a full-scale building model and an active bracing system as the control<br />device. Two modal control cases, namely, one full-state feedback and one direct output feedback control<br />were tested and compared. The experimental result shows that in mitigating the seismic response of<br />building structures, modal control with direct output feedback can be as effective and efficient as that with<br />full-state feedback control. For practical concerns, the control performance of the proposed method in the<br />presence of sensor noise and stiffness modeling error was also investigated. The numerical result shows<br />that although the control force may be increased, the maximum floor displacements of the controlled<br />structure are very insensitive to sensor noise and modeling error.