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Calcul de la fléche d'une poutre béton armé

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j'ai une poutre en béton armé isostatique sur 2 appuis simple 


Donnés : Fc28 = 25 mpa

               b = 22 cm

               h = 45 cm

               Fe = 400 mpa

Mu = moment elu  = 12 tm

Ms = moment a l'els = 7 tm

  Comment calculer la  fleche de cette poutre et si vous vs permeettez de me donner la formule de fleche pour une poutre hyperstatique 


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