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Acoustic emission monitoring and numerical modeling of FRP delamination in RC beams with non-rectangular cross-section

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Abstract

A case study concerning both numerical modeling and in-situ monitoring of a retrofitted RC beam with non-rectangular cross-section is presented. Before retrofitting, non-destructive techniques, such as pull-out and impact tests, were used to estimate the mechanical parameters of concrete. At the same time, a long-term monitoring with the Acoustic Emission (AE) technique was carried out in order to investigate on creep effects and microcracking phenomena. Then, after a complete removal of the overload and retrofitting with FRP sheets, an in-situ loading test was performed. At that stage, the AE technique was again profitably used for the analysis of the cracking progression leading to FRP debonding. A numerical model of the structure is then proposed in the framework of the FE discretization with mechanical parameters estimated according to an inverse analysis on the monitored mechanical behavior of the structure before retrofitting. According to this model it is shown that, when the flexural inertia of the retrofitted beam is considerably higher than that of the unrepaired beam, snap-back instabilities can take place. Finally, considering the self-similarity between the acoustic emission phenomenon and seismicity, an analogy between the snap-back instability of the FRP delamination and that occurring during fault growth is proposed.

Résumé

Une étude de cas au sujet de modeler numérique et de surveiller in-situ d’un faisceau monté en rattrapage de RC avec la section transversale non-rectangulaire est présentée. Avant l’adaptation d’un faisceau, des techniques non destructives, telles que des essais à dégagement et à choc, ont été employées pour estimer les paramètres mécaniques du béton. En même temps, une surveillance à long terme avec la technique d’émission acoustique (AE) a été effectuée afin d’étudier sur des effets de fluage et des phénomènes de microfissuration. Puis, après un déplacement complet de la surcharge et l’adaptation ultérieure avec des feuilles de FRP, un essai in-situ de chargement a été réalisé. Á cette étape, la technique d’AE a été encore profitablement employée pour l’analyse de la progression de fissures menant au décollement du FRP. On propose alors un modèle numérique de la structure dans le cadre de la discrétisation FE avec des paramètres mécaniques estimés selon une analyse inverse sur le comportement mécanique surveillé de la structure avant l’adaptation ultérieure. Selon ce modèle, on le démontre que, quand l’inertie flexural␣du faisceau monté en rattrapage est considérablement plus haute que cela de la structure non réparé, les instabilités de snap-back peuvent avoir lieu. En conclusion, vu l’auto similarité entre le phénomène d’émission et la séismicité acoustiques, on propose une analogie entre l’instabilité de snap-back du décollement de FRP et cela qui se produit pendant la croissance de défaut.

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Acknowledgements

Support of the Ministry of University and Research (MIUR) is gratefully acknowledged. The Authors would like to thank the Ph.D. student Gianni Niccolini for the elaboration of the AE sources location and the Architects Massimo Aprile and Luigi Bacco for the technical support provided in the structural monitoring.

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  1. Department of Structural Engineering and Geotechnics, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy

    A. Carpinteri, G. Lacidogna & M. Paggi

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  1. A. Carpinteri
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  2. G. Lacidogna
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  3. M. Paggi
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Correspondence to A. Carpinteri.

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Carpinteri, A., Lacidogna, G. & Paggi, M. Acoustic emission monitoring and numerical modeling of FRP delamination in RC beams with non-rectangular cross-section. Mater Struct 40, 553–566 (2007). https://doi.org/10.1617/s11527-006-9162-4

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