lifting the construction
Some weak springs estabilizing supports on the right places were enough to get good results
Also changed the analysis type in the cross beam model from Large displacements to regular linear analysis.
models attached.
If your crane is tall enough ,on the cross beam model , the best place would be lifting from the beam extremes not in the middle portion of it. It is causing high bending moments on it
Rafael Medeiros
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Hard to tell .This depends on each country code. Each one has its rules. But of course in all of them ,the structure has to be checked OK regarding the forces that appear during the lifting process.
Rafael Medeiros
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Sorry for the delay.
I never have done an analysis like that
Maybe there are some codes that provide how to do this, but none there I know.
If you want to shake the structure using Robot, probably will be using Time history analysis.
Or maybe some sort of "fake" seismic analysis which I also don't know how to do it as there are no earthquakes in Brazil.
I never have done an analysis like that
Maybe there are some codes that provide how to do this, but none there I know.
If you want to shake the structure using Robot, probably will be using Time history analysis.
Or maybe some sort of "fake" seismic analysis which I also don't know how to do it as there are no earthquakes in Brazil.
Rafael Medeiros
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Artur Kosakowski
Answer regards adjusting support node position in attached models steps.zip.
MZ and MY , FZ are reactions (in node 5) , while x and y are support node position correction distance. Both (reactions and distance corrections) are calculated in global system of coordinates (X,Y,Z)
Krzysztof Wasik
To avoid signs analysis in respect to global axes direction(which is of course possible) I would use 2 iterations with +and - sign for calculated offset, then I would apply this sign which reduces reaction moment.
Similar effect can be obtained by adjusting node 5 X and Y coordinates to structure center of gravity available in Analysis >Calculation notes>Full or Simplified note (in few iterations).
Refer to
Krzysztof Wasik