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Calcul de flèches


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Dans le bael il y a un article sur les flèches,notamment deltaft = fgv-fji + fpi - fgi,

fpi-fgi correspond au charges d'exploitation fqi mais pourquoi considère t'on les modules d'élasticité instantanée alors que les durées d'application des charges peuvent etre supérieures à 24h en exploitation, pourquoi ne par t-on pas sur le long terme aussi, avec Ev comme module et Iv.

Merci de vos reponses.

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