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Difference entre SigmaBc et Fbu


warrior0
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Bonjour.

J'aimerai comprendre la différence entre SigmaBc = 0.6fc(28) et Fbu = 0.85Fc(28)/Gammab

 

pour SigmaBc normalement c'est la limite auquel au delà le béton comprimé se fissure si j'ai bien compris

 

et pour Fbu alors il signifie quoi s'il vous plait?

 

merci beaucoup

 

a bientôt.

 

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