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Classification d'une section sous flexion composée


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Je suis sur le point de faire la classification d'un profilé sollicité à la flexion composée, mais je n'ai pas bien saisi comment calculer le alpha ( classe 1 ), j'ai trouvé la formule de ALPHA  mais je veux comprendre comment ils l'ont tiré.

Je serai très ravie de vous lire.


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