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eurocode 3 flambement flexion calcul de βm sans risque de déversement

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j'ai un problème avec le coefficient βm

ex: un poteau biencastré soumis à une charge axiale et à ue charge transversale léinique

noremalemet βm = βm,Ψ+ MQ/ΔM(1,3 - βm,Ψ)

βm,Ψ = 1,8 - 0,7Ψ

ΔM = |Max M|+|Min M|

MQ = Max M due au charge latérale seulement

noremalement βm = 1,3 mais moi j'ai trouvé 1,4

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