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On the identification of axial force in stay cables anchored to flexible supports
Foti, Francesco; Geuzaine, Margaux; Denoël, Vincent
2021In Proceedings of the 2nd International Symposium on the Dynamics and Aerodynamics of Cables
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Keywords :
axial force identification; bending stiffness; support flexibility
Abstract :
[en] Identification of the axial force in stay cables is of paramount importance for health moni- toring and safety assessment purposes. Vibration based testing techniques provide the ground for quick and cheap identification strategies, based on the knowledge of (a) a set of identified natural frequencies, and (b) a structural model that relates natural frequencies to the axial force value. Reliability of results, hence, is inherently related to the predictive capabilities of the underlying structural model. Errors may arise, in particular, from the modeling of boundary conditions. Ideal boundary conditions are often introduced, in the form of either perfectly hinged or perfectly clamped cable end sections, to simplify the analytical treatment of the problem. As a first step towards a quantitative assessment of the effect of unknown boundary conditions on the modal properties of stay cables, the present paper focuses on a taut cable with small bending stiffness anchored to flexible supports. Asymptotically accurate closed form equations for the natural frequencies of the cable are firstly obtained, generalizing a well-known result of the literature valid in the particular case of perfectly clamped end sections (Morse and Ingard, 1968; Caetano, 2007). Starting from the theoretical results obtained on this archetypal structural model, a simple but effective procedure to simultaneously identify the axial force,the bending stiffness and a support flexibility parameter of the stay cable is presented and validated through numerical testing. Parametric analyses are then carried out to assess the effects of uncertainties in the definition of the degree-of-fixity of the cable restraints on the accuracy of the identified axial force in the case of frequencies contaminated by measurement errors.
Disciplines :
Civil engineering
Author, co-author :
Foti, Francesco ;  Université de Liège - ULiège > Département ArGEnCo > Analyse sous actions aléatoires en génie civil
Geuzaine, Margaux  ;  Université de Liège - ULiège > Département ArGEnCo > Analyse sous actions aléatoires en génie civil
Denoël, Vincent  ;  Université de Liège - ULiège > Département ArGEnCo > Analyse sous actions aléatoires en génie civil
Language :
English
Title :
On the identification of axial force in stay cables anchored to flexible supports
Publication date :
September 2021
Event name :
International Symposium on the Dynamics and Aerodynamics of Cables
Event organizer :
University of Stavanger
Event place :
Stavanger, Norway
Event date :
16-17 septembre 2021
Audience :
International
Main work title :
Proceedings of the 2nd International Symposium on the Dynamics and Aerodynamics of Cables
Peer reviewed :
Peer reviewed
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
SPW - Service Public de Wallonie. Mobilité et des Voies hydrauliques
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