Damage quantification in beam-like structures from modal flexibility change

Le, N. T. and Thambiratnam, D. P. and Chan, T. H. T and Nguyen, A. (2018) Damage quantification in beam-like structures from modal flexibility change. In: 8th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII 2017): Structural Health Monitoring in Real-World Application, 5-8 Dec 2017, Brisbane, Australia.

Abstract

An approach to quantify the severity of damage in Euler-Bernoulli beams from changes in modal flexibility is presented. The approach is built on two pillars. The first is the connection between flexibility relative change (RFC) and the damage-induced relative deflection (DI-RD). This connection allows one to estimate the DI-RD under arbitrary static point loads from the dynamically measured RFC matrix. The second pillar is the theoretical relationship between (i) the elemental damage severity and (ii) the DI-RD under unit point loads. For statically determinate beams, the scalar function relating these two parameters can be conveniently formulated from the principle of Virtual Work method. It reveals that the scalar function contains only the geometrical information including location of the identified damaged element. Therefore, once the damaged element is located, the damage severity can be calculated. Numerical investigations show that the approach accurately quantifies damage in cantilever and simply supported beams. A merit of this approach is that it has a clear theoretical base and it can be expanded to any statically determinate and indeterminate beam-type structures whose deformation function under point loads can be formulated. As beams can represent various structural components, the proposed approach provides a promising platform targeting the application to real structures


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher. This conference is the largest conference in the field of Structural Health Monitoring. Its proceedings are indexed by Scopus and ranked in Scimago: https://www.scimagojr.com/journalsearch.php?q=International+Conference+on+Structural+Health+Monitoring+of+Intelligent+Infrastructure
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Date Deposited: 05 Jul 2019 02:01
Last Modified: 05 Jul 2019 05:02
Uncontrolled Keywords: structures (built objects); damage detection; structural health monitoring; modal strain
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
URI: http://eprints.usq.edu.au/id/eprint/36674

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