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Hi All,
I only have one instability warning left in my model: "The instability (3 type) in the Rz direction in the node 191420". But when I zoom in to node 19420 I do not see anything wrong there. See Sketch 5 - Calculation Message in the attached PDF. Model is also attached.
So far I applied only selfweight load on the structure. Load case DL1.
When I checked the reactions, I noticed that Actions and Reactions are not balanced. See attached Sketch 6 - Action -Reaction balance. The difference is about 10600 kN but it should be zero..
I also put few more sketches in the attached PDF:
- Sketch 1 - Deformed Shape
- Sketch 7 - Foundation stress
- Sketch 8 - Foundation settlement.
It seems that the building is tilting towards one side. I now have excessive stresses and settlements in foundations. Note that this is only due to selfweight force that is DL1, at the moment. Things will get worse when I apply wind and seismic horizontal forces.
Could it be that the warning message is due to global instability of the structure, rather than just a simple local modelling issue?
What causes the action reaction imbalance in my model?
Many thanks,
Aleksandar
Solved! Go to Solution.