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quistion action vent

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bnj, voila mon prblm, pour le calcul d l charge du vent sur un hangar en charpente metallique selon RNV2013, pour cela  on considéré les 4 direction, l'hangar est bi-symétrique donc on considéré juste 2 direction, dans la direction d vent parallèle au long-pan (perpendiculaire au pignon), pour le calcule de Cr (coeff de rugosité) on prend  le cas 1 ou cas 2 dans l figure ci-dessus

Sans titre.png

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