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A control method is proposed based on frequency shaped LQG and variable gain feedback in order to choose proper control objective and prevent saturation of control force considering intensity of ground motion and level of building response. The controller examines exceedance rate of building response over a threshold and the maximum required control force estimated from ground acceleration in order to reduce response of both a building and elevator rope efficiently preventing saturation. It is demonstrated that the proposed method can suppress unpreferable response of building layers near the top induced by control force.

VARIABLE GAIN FEEDBACK CONTROL OF A HIGH-RISE BUILDING-ELEVATOR SYSTEM ADJUSTED TO GROUND MOTION INTENSITY AND RESPONSE LEVEL