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Issue in mass calculation

Issue in mass calculation

Issue in mass calculation

(OP)
hi there,
I have a problem in my model that the mass calculation for earthquake forces is zero , so there aren't any forces duo to EQs


my mass source is defined well


I can't find any thing refer to that problem and I didn't find any reason for it
I'm using Euro 2004's code for EQ calculations and all sittings are fine , even when i tried to enter EQ forces manually or by a time history the mass still 0 and there no effect for it.
have any idea about that ?

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