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Calcul de l'ouverture de fissure


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Je voudrais savoir  pourquoi est-ce qu'on ne tient pas compte de l'effort normal dans le calcul de la contrainte dans les armatures de béton armé tendu бs , (on met  бs=Mser/(zc*As) meme s'il y'a un effort normal (soit de traction ou compression)

avec εsm-εcm=max[{(бs-kt *(fct , ef/f Ppeff) *(1+alfae*p, eff)}/ Es , 0.6*( бs /Es )]

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