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Calcule feraillage du poteau


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Bonjour a tous j'espére que vs allez b1. je voudrais vous poser une question pour calculer  section acier du poteau

initialement je vs informe que j'ai calculé la surface d'influence d' poteau ;ca me donne 900KN a L'ELU!!!la valeur d section d' poteau 30*40

la question est:comment calculer acier sachant que: Fe=500MPA  et FC28:25MPA  et chargé appliqué a 28jours

auparavant j'ai appliqué l formule ATH<[(NU/alpha)-br*FC28/0,9*yb)]*ys/FE ca me donne u valeur 

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