Gain-Scheduled Adaptive Control for Seismically Excited Hybrid Structures

• Published in: Journal of structural engineering (New York, N.Y.) Vol. 127; no. 11; pp. 1286 - 1294
• Main Authors: Parlos, Alexander G, Abraham, Moises A, Morgan, James R
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01.11.2001
• Subjects: Applied sciences; Buildings. Public works; Exact sciences and technology; Geotechnics; Structure-soil interaction; TECHNICAL PAPERS; Metallic structure; Multistorey portal frame; Vibration control; Structure soil interaction; Passive system; Earthquakeproof bearing; Adaptive control
• DOI: 10.1061/(ASCE)0733-9445(2001)127:11(1286)
• ISSN: 0733-9445

A nonlinear controller is developed using gain-scheduled adaptation for a six-story, base-isolated office building subjected to strong earthquakes. Several linearized models and a scheduled piecewise linear model of the structure are developed using a finite-element nonlinear model. Compensators are designed, based on the H∞ control design method using the linearized models. The family of designed compensators is then gain-scheduled. The selected scheduling variable is a combination of the interstory ductility and the measured earthquake magnitude. The performance and robustness of the gain-scheduled adaptive controller is extensively studied for a variety of earthquake 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 key advantage of the gain-scheduled adaptive controller, compared to a constant-gain controller, is the reduction of up to 40% in the applied control forces while maintaining the same closed-loop performance.