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Dsplacement different from theory

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jneves
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Dsplacement different from theory

I'm a Robot structural user but to design some specific elements, I might need to run some simulations on fusion.

 

I modelled an RHS bar and the displacement is different from that given theoretically (dmax = 5/384 PL^4 / EI) for simply supported elements for a distributed load.

 

What am I missing? Did this happen to someone else?

 

In Robot Structural Analysis (also from Autodesk) the displacement is the same as given by the formula written above.

 

I'll leave the file attached.

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