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Eurocode 8 lateral forces issue

Eurocode 8 lateral forces issue

Eurocode 8 lateral forces issue

(OP)
Dear Users,

Does anybody have any idea why in ETABS and SAP2000 seismic loadings for EUROCODE8 are calculated based on weight and not mass.

The formula in code is (Fb = Sd * m * Lambda) but in lateral force manual which comes with these softwares it is stated as (Fb = Sd * W * Lambda) and by checking the outputs all results are greater than what I expect:

By using mass (which I think is correct):
Fb = Sd(m/s2) * m(kg) * Lambda(unitless) = kg.m/s2 = N

However by using weight (ETABS and SAP2000):
Fb = Sd(m/s2) * W(N) * Lambda(unitless) = N.m/s2 which is not force anymore

Thanks in advance.
Regards,

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