ABSTRACT
An improved control algorithm based on the theory of variable structural control or sliding mode control is presented. A method for determining the sliding surface by pole assignment algorithm using complex Fourier coefficients of the incoming earthquake signal applied to the structure is proposed. The design response spectrum is used for estimation of maximum control force for saturated control. Furthermore, a more general theoretical description of the sliding surface of the system is presented. The potential applications and the effectiveness of the proposed control algorithm are demonstrated by numerical examples. The simulation results indicate that a trade–off between the control forces and the structural response is possible.