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la résultante R du pont roulant


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bonjour ,

en ce qui concerne le dimensionnement de poutre de roulement de pont roulant je voudrais savoir quand on utilise le Q rmax de (pont roulant) dans le calcul et quand on utilise la résultante R= 2 Qrmax

car je sais pas ça sert a quoi la résultante R

et merci de me répondre

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