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Beton precontraint (fuseau de passage)


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Bonjour

Je suis entrain de calculer poutre isostatique en beton precontrain

Je remarque lorsque je vien a dessiner le cablage eo(x) : 

Dans exercice 1 ils ont considerer quil est le moyen entre emin(x) et emax(x)

2eme exercice eo(x) depend de M(x) (moment)

3eme exercice eo(x)= emin(x) + 0.02

Pourquoi chaque foix quand je veux trouver eo(x)  la formule se differe 

https://www.scribd.com/document/427217118/339805762-precontraint-poutre-isostatique-pdf

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