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Difference entre SigmaBc et Fbu


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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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