Locating and Quantifying Damage in Beam-like Structures Using Modal Flexibility-based Deflection Changes

Le, N. T. and Nguyen, A. and Thambiratnam, D. P. and Chan, T. H. T and Khuc, T. (2020) Locating and Quantifying Damage in Beam-like Structures Using Modal Flexibility-based Deflection Changes. International Journal of Structural Stability and Dynamics, 20 (10):2042008. 2042008-1-2042008-20. ISSN 0219-4554

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Abstract

This paper presents an enhanced method to locate and quantify damage in beam-like structures using changes in deflections estimated from modal flexibility (MF) matrices. The method is developed from explicit relationship between a series of MF-based deflection change vectors and the damage characteristics. Based on this, three damage locating criteria are defined and used to detect and locate damage. Once the damage is located, its severity is estimated conveniently from a closed-form function. The capability of the proposed method is examined through numerical and experimental verifications on a steel beam model. The result shows that the method accurately locates and quantifies damage under various scenarios using a few modes of vibration, with satisfactory or even better results compared to those obtained from traditional static deflection-based method. The performance of the proposed method is also compared with three well-known vibration-based damage detection methods using changes in modal flexibility and modal strain energy. It is found that the proposed method outperformed the other three methods, especially for multiple damage cases. As beams can represent various structural components, the proposed method provides a promising damage identification tool targeting the application to real-life structures.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 23 Nov 2020 04:16
Last Modified: 30 Nov 2020 23:25
Uncontrolled Keywords: Damage detection; In-service monitoring; Modal flexibility change; Modal flexibility-based deflection; Damage quantification; Beam-like structures
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
Identification Number or DOI: https://doi.org/10.1142/S0219455420420080
URI: http://eprints.usq.edu.au/id/eprint/40115

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