Gain-scheduled adaptive control for seismically excited hybrid structures

A nonlinear controller is developed using gain-scheduled adaptation for a s ix-story, base-isolated office building subjected to strong earthquakes. Se veral linearized models and a scheduled piecewise linear model of the struc ture are developed using a finite-element nonlinear model. Compensators are designed, based on the H. control design method using the linearized model s. The family of designed compensators is then gain-scheduled. The selected scheduling variable is a combination of the interstory ductility and the m easured earthquake magnitude. The performance and robustness of the gain-sc heduled adaptive controller is extensively studied for a variety of earthqu ake records and uncertainties, ranging from structure parameter variations to controller hardware-related time delays. All controller simulations are performed using the detailed finite-element nonlinear structure model. A ke y advantage of the gain-scheduled adaptive controller, compared to a consta nt-gain controller, is the reduction of up to 40% in the applied control fo rces while maintaining the same closed loop performance.