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probléme de mode ??


ab1234

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salam :

j'ai modélisé ma structure avec etabs 9.5 , j'ai proposé des disposition de voile mais tous les modes sont de rotation .

note : 90% de masse modal atteint le 4eme mode .

ma question : est ce que est il obligatoire que le 1er et 2eme mode soit de translation ?

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