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Etude de l’effet d’adhérence acier-béton sur la réponse non-linéaire des piles de pont en BA
Abstract
Cet article discute de l’importance d’inclure l’effet de l’adhérence acier-béton dans l’étude du comportement non-linéaire des piles de pont en BA. La sensibilité de la réponse non linéaire à l’adhérence par glissement a été étudiée en considérant un modèle EF multifibre. Des analyses Pushover (cyclique et monotone) ont été conduites et les résultats ont été discutés en considérant différents indicateurs de performances sismiques. L’importance de ce phénomène a été également démontrée en quantifiant les différents états limites de dommages et sa contribution dans le déplacement total de la pile de pont. Les résultats indiquent que l’introduction de l’effet de l’adhérence par glissement des barres d’acier longitudinales peuvent modifier de manière significative les prédictions du comportement non-linéaire des piles de pont en BA où une surestimation de la rigidité initiale et de l’énergie de dissipation des piles de pont ont été observées. De ce fait, la prise en compte de ce phénomène dans la modélisation non linéaire des colonnes en BA est indispensable.
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