Structural Damage Detection from Modal Strain Energy Change
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VIEW THE REPLYPublication: Journal of Engineering Mechanics
Volume 126, Issue 12
Abstract
A structural damage detection method based on modal strain energy (MSE) change before and after damage is presented in this paper. The localization of damage based on MSE of each structural element is briefly presented, and the sensitivity of the MSE with respect to a damage is derived. The sensitivity is not based on any series expansion and is a function of the analytical mode shape changes and the stiffness matrix. Only incomplete measured mode shapes and analytical system matrices are required in this damage localization and quantification approach. Results from a numerical example and an experiment on a single-bay, two-story portal steel frame structure are investigated. The effects of measurement noise and truncated analytical mode shapes are discussed. Results indicate that the proposed approach is noise sensitive, but it can localize single and multiple damages. Damage quantification of two damages is successful with a maximum of 14% error under a 5% measurement noise.
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Published In
Journal of Engineering Mechanics
Volume 126 • Issue 12 • December 2000
Pages: 1216 - 1223
History
Received: Aug 26, 1998
Published online: Dec 1, 2000
Published in print: Dec 2000
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