Evaluation d’indicateurs d’endommagement basés sur le comportement dynamique des structures pour la détection et la localisation de défauts

Mohamed TAHIRI; Julian RAEDERSDORFF; David CLAIR; Abdelhamid BOUCHAIR

doi:10.26168/ajce.41.1.5

Mohamed TAHIRI Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont–Ferrand, France
Julian RAEDERSDORFF Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, CIDECO, F-63000 Clermont–Ferrand, France
David CLAIR Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont–Ferrand, France
Abdelhamid BOUCHAIR Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut Pascal, F-63000 Clermont–Ferrand, France

DOI: https://doi.org/10.26168/ajce.41.1.5

Keywords: Réponse dynamique, Monitoring des Structures, Indicateurs d’endommagement

Abstract

Many damage indicators based on the evolution of modal characteristics (eigenfrequencies and eigenmodes) have been proposed in the literature over the last 20 years. The presented work proposes a comparative analysis of these indicators and their expected performances according to the typology of degradation but also to the number of sensors used for the observation of the dynamic response which is an essential parameter for the practical implementation of monitoring systems on real structures. This approach is based on a theoretical and numerical study in the simple case of a bi-supported beam subjected to different damage scenarios as well as on a numerical model/experimental coupling applied to a laboratory steel frame structure. The synthesis of the results obtained allows to identify simple rules concerning the validity domains of the studied damage indicators.