Structural System Identification of Buildings by a Wave Method Based on a Nonuniform Timoshenko Beam Model
Publication: Journal of Engineering Mechanics
Volume 141, Issue 8
Abstract
A nonuniform Timoshenko beam model of a building, with piecewise constant properties along the height, is presented, along with an algorithm for structural system identification from earthquake records. The model accounts for shear and flexural deformation, rotatory inertia, and variation of building properties with height. The model stiffness parameters are identified by matching (in the least-squares sense) propagating pulses in impulse response functions. To minimize the effects of soil–structure interaction, the fit is performed on a band excluding the fundamental mode of vibration. This algorithm is a new development in a wave method for structural health monitoring of buildings, intended for use in seismic alert systems to facilitate decision making on evacuation immediately after the earthquake, and for general condition monitoring. The model can also be used with an earthquake early warning system for quick linear response prediction to decide on safe shutdown of sensitive equipment in advance of strong shaking. Identification and response prediction are demonstrated on the north–south response of the Los Angeles 54-story Office Building, a tall, steel-frame building in downtown Los Angeles.
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Acknowledgments
The structural array in this building is operated by the Strong Motion Instrumentation Program of the California Geologic Survey. The data are distributed by the CESMD (〈http://strongmotioncenter.org/〉). The authors are grateful to Gregg Brandow and Mihailo Trifunac for the insightful discussions on the design and response of tall buildings, and to the two anonymous reviewers, whose comments improved this paper.
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Published In
Journal of Engineering Mechanics
Volume 141 • Issue 8 • August 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 14, 2014
Accepted: Jan 20, 2015
Published online: Apr 28, 2015
Published in print: Aug 1, 2015
Discussion open until: Sep 28, 2015
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