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Force vs. RemoteMass, completely different results

Question asked by Kevin De Smet on Mar 12, 2011
Latest reply on Mar 20, 2011 by Jerry Steiger

I have a mass of 500kg, or a force of 4900N, pulling these structural beams down. I would expect both of these to yield similar (but not exact) results. However, there is about a 3x difference. The mass load pushes the problem even beyond the small displacement assumption I'm taking here. The force load does not. Both ends of the model are bonded to a small additional portion that is fixed. Is the mass load generating large reaction moments?

 

What am I missing here?

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