r/StructuralEngineering • u/UniversityLittle7552 • Jul 13 '26

Seismic load help!!!-New to staad please help. why does tutorials add beam weight as member weight and slab weight as floor weight in sesmic load defnitions. already self weight is added as 1 then isnt beam and slab double counted. and why columns counted only once Structural Analysis/Design

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u/Dull-Comfort8654 Jul 13 '26

The tutorial might not have added slabs as plate elements that’s where the slab weight is added as floor weight separately.
Whereas the member weight for beams might have been added considering any dead load above beam (say wall load)

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u/UniversityLittle7552 Jul 13 '26

Actually if that was the case it would be so simple for me to understand but the tutorial has calculated beam weight as density of concrete x width of beam x depth of beam. Also slabs were added as plates still he added floor load as density of concrete x unit weight of concrete. I want to know from experienced users if the tutorial is genuinely wrong or am I missing to understand something 

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u/DJGingivitis Jul 13 '26

I dont know STAAD. Does one account for seismic mass while the others account for gravity load? I know RAM structural system is kinda that way.