Modal Strain Energy Decomposition Method for Damage Localization in 3D Frame Structures
Publication: Journal of Engineering Mechanics
Volume 132, Issue 9
Abstract
This article presents a newly developed modal strain energy decomposition method for damage localization that is capable of identifying damage to individual members of three-dimensional (3D) frame structures. This method is based on decomposing the modal strain energy of each structural member (or element) into two parts, one associated with the element’s axial coordinates and the other with its transverse coordinates. In turn, two damage indicators are calculated for each member to perform the damage localization analysis. Implementing this method requires only a small number of mode shapes identified from both the damaged and baseline structures. Numerical studies are conducted of a 3D five-story frame structure and also a complicated offshore template platform, based on synthetic data generated from finite-element models. In addition to providing theoretical insights to illustrate the advantages of using this newly developed method, this article also demonstrates numerically that the new method is capable of localizing various kinds of damaged elements (a vertical pile, horizontal beam, or slanted brace) at a template offshore structure.
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Acknowledgments
This work has been financially supported by the 863-project of China (Program No. 2001-AA602023-1), and also by the National Science Fund for Distinguished Young Scholars under the Grant No. 50325927.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 9 • September 2006
Pages: 941 - 951
Copyright
© 2006 American Society of Civil Engineers.
History
Received: Jun 7, 2004
Accepted: Jan 3, 2006
Published online: Sep 1, 2006
Published in print: Sep 2006
Notes
Note. Associate Editor: Joel P. Conte
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