Structural Damage Detection and Assessment from Modal Response
Publication: Journal of Engineering Mechanics
Volume 129, Issue 2
Abstract
This paper presents a global damage detection and assessment algorithm based on a parameter estimation method using a finite-element model and the measured modal response of a structure. Damage is characterized as a reduction of the member constitutive parameter from a known baseline value. An optimization scheme is proposed to localize damaged parts of the structure. The algorithm accounts for the possibility of multiple solutions to the parameter estimation problem that arises from using spatially sparse measurements. Errors in parameter estimates caused by sensitivity to measurement noise are reduced by selecting a near-optimal measurement set from the data at each stage of the localization algorithm. Damage probability functions are computed upon completion of the localization process for candidate elements. Monte Carlo methods are used to compute the required probabilities based on the statistical distributions of the parameters for the damaged and the associated baseline structure. The algorithm is tested in a numerical simulation environment using a planar bridge truss as a model problem.
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Information
Published In
Journal of Engineering Mechanics
Volume 129 • Issue 2 • February 2003
Pages: 135 - 145
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: May 22, 2001
Accepted: Jul 3, 2002
Published online: Jan 15, 2003
Published in print: Feb 2003
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