TWO design techniques are proposed to improve disturbance attenuation
of seismic-excited buildings with bounded actuators. The first techniq
ue is based strictly on the quadratic stabilization with a disturbance
attenuation technique and the second relies on a multiobjective appro
ach that combines the first technique with constraints on the inputs.
The second technique makes use of the available information regarding
actuator capacity and peak magnitude of disturbance; hence, its result
s are less conservative. The sufficient conditions for feasibility of
a full-state feedback controller are expressed in terms of linear matr
ix inequalities (LMIs). For the output feedback design, it is assumed
that ground acceleration is available for measurement and the controll
er is assumed to have an observer-based structure. The validity and ap
plicability of the two proposed techniques are illustrated using simul
ations of a six-story building subjected to earthquake.