DESIGN SPECTRA FOR ACTIVELY CONTROLLED STRUCTURES BASED ON CONVEX MODELS

Preliminary design of an actively controlled structure requires a simp le procedure for analysis and performance evaluation. A response spect rum technique applied to simplified models of complex structures can p rovide such a procedure. The spectra required for preliminary evaluati on of a controlled structure include, besides the usual response param eters (displacement, acceleration, base shear), the control resource p arameters, such as the size and capacity of hydraulic actuators, power requirements and energy consumption. This paper presents an approach for the development of design spectra based on a classical optimal con trol law and convex models of uncertainty. Analytical expressions are derived at each step so that one can obtain the values of basic design parameters of the control system without the need for a response hist ory analysis. Based on these parameter values, preliminary design can be initiated and system cost can be estimated.