Multiple Damage Identification in Beams from Full-Field Digital Photogrammetry
Publication: Journal of Engineering Mechanics
Volume 145, Issue 8
Abstract
This paper addresses the identification problem of multiple open cracks in beams based on damage-induced variations in the static deflection of the beam. A two-step non-model-based damage localization and quantification methodology is proposed. First, the damage locations can be identified from the slope discontinuities in the deflection variation using a specific linear-trend filtering function. Then, the crack depths can be assessed from characteristic expressions of rotational spring models. An experimental case study of a simply supported beam with multiple cracks is used to exam the performance of the method. The deflections of the beam were measured with a digital photogrammetric system using partial measurements. The difference between the idealized lumped spring model for the crack and the actual effect of a real crack in the damage identification process and the performance of the method for statically indeterminate beams are illustrated through numerical examples. The paper shows that the proposed method can accurately locate and quantify multiple closely spaced cracks in beams in practical applications.
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Acknowledgments
This work was supported by the Consejería de Economía, Innovación, Ciencia y Empleo of Andalucía (Spain) under Project P12-TEP-2546 and the Spanish Ministry of Economy and Competitiveness (Ministerio de Economía y Competitividad, Secretaría de Estado de Investigación, Desarrollo e Innovación) through Research Project BIA2016-43085-P. The financial support is gratefully acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 145 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 13, 2018
Accepted: Dec 12, 2018
Published online: May 27, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 27, 2019
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