Substructure identification for shear structures II: Controlled substructure identification

摘要

The companion paper proposed a substructure identification method for shear structures and derives the method’snerror analysis, demonstrating that the identification errors are closely related to two important structural responses:n(i) the frequency response of the interstory acceleration of the identified story and (ii) the frequency response rationbetween interstory accelerations of two adjacent stories. The identification accuracy of this substructure methodncan be improved by amplifying the first response and reducing the second response near the substructure naturalnfrequency. Herein, a controlled substructure identification method is proposed, which utilizes two kinds of structuralncontrol systems, an active mass driver system, and a passive interstory brace system, to temporarily shift thensystem dynamics to improve the accuracy of parameter identification. The optimal parameters of two control systemsnare obtained by solving specially designed optimization problems. Because the accuracy of the controllednsubstructure identification does not directly depend on complex modal properties of the closed-loop controllednstructure but only on the controlled structural responses, the controlled substructure identification method is quitenrobust to control system errors. Numerical simulations demonstrate that both control methods did greatly improventhe accuracy of the identification and were robust to fairly large feedback measurement noise. Copyright © 2012 JohnnWiley & Sons, Ltd.