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Coefficient Ko ou Ka


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Bonjour tous

je cherche à comprendre comment choisi-t-on d'utiliser le coefficient Ko ou Ka dans un calcul de mur de soutènement ??

est ce qu'il faut évaluer les déplacements? Dans ce cas à partir de quelle valeur de déplacement pet on considérer l'utilisation de Ka?

merci d'avance 

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