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Distribution of base shear forces in ETABS

Distribution of base shear forces in ETABS

Distribution of base shear forces in ETABS

(OP)
Hello,
I have a question that may sound trivial! If I modelled a wall in ETABS as a shell thin and applied on shear forces at different levels, and I defined the restraints at the base on the two edges as pin-pin, shouldn't the two reactions at the base be equal?
I see a difference in reactions, of course the total sum is correct, but why wouldn't I get equal reaction? See attached.

RE: Distribution of base shear forces in ETABS

No they shouldn't bacause there is in-plane stress in the elements.

RE: Distribution of base shear forces in ETABS

(OP)
Can you elaborate please?

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