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What are STORY FORCES in ETABS?

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OnePowers

Civil/Environmental
May 22, 2021
26
Kind regards colleagues.

I have a doubt, which in my opinion it looks simple, but I have not been able to figure it out for long time and it always appears in my way.

What are the Story Forces in ETABS, and more precisely the moments that appear there, i mean, Mx and My?

Why in a purely vertical combination, such as D + L, does ETABS tell me that those moments, Mx and My have large values, even though the floors have zero shear? (I send the image of the results).

Thank you very much in advance.

Eng_tips_ejsjnm.png
 
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There was a similar question here. Cause the vertical load P is eccentric to the origin.
 
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