Journal
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
Volume 20, Issue 2, Pages 567-579Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921720941792
Keywords
Nonlinear acoustics; modal analysis; vibration; damage localization; damage detection; concrete; modal curvatures
Funding
- French government's program Investissements d'avenir
- project Dynamique et controle nondestructif (DCND)
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Different methods were investigated to detect and localize damage from linear and nonlinear vibration responses in this study. The variations of linear resonant frequencies, modal assurance criterion values, and nonlinear hysteretic parameters were used for damage detection. Damage localization was achieved by analyzing modal shapes and using outlier identification techniques.
In this study, different alternatives to detect and localize damage from linear and nonlinear vibration responses were investigated. These alternatives were compared on two concrete slabs subjected to different damage extents. Linear and nonlinear modal test configurations were considered. The variations of linear resonant frequencies, modal assurance criterion values, and nonlinear hysteretic parameters were used to detect damage. Then, the modal shapes were used to locate damage positions. The maximum principal curvatures derived from the original modal shape displacements between damaged and undamaged states made it possible to spot the damaged zones. Damage localization was further enhanced by weighting the principal modal shape curvature differences for every mode by their respective variations of the nonlinear hysteretic parameter. Finally, damage localization was achieved using different outlier identification techniques.
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