instability type 3 RX direction
Open calculatin Report , find there Max min values on stiffeness matrix diagonal and write here these two values.
Rafal Gaweda
if the difference between these values is greater than 1e11 \ 1e12 program reports instability number 3.
It is related to big differences in stiffenes of elements for example very short elements exist in model = some inaccuracies.
You can check it this way: on dummy model select everything, make intersection, then open Bars table on View tab. Find shortests bars. Then locate nodes \ places on original model and correct location of nodes.
If it is not the case. Send me model. You already know how.
Rafal Gaweda
the first, AUVENT_V2, is calculated without sismic load and is free of instability.
I do not think so :
Rafal Gaweda
Ignore it. Related to solver tolerances.
To check - use Skyline solver -> no instability.
Rafal Gaweda
-> How is it possible to justify that the instability can be ignored?
In this case - change solver onto Skyline ;
Create new case apply nodal load on direction given in warning message, after caclulations check displacement and rotations in this node
-> How is it possible to highlight the calculation node wich is going wrong?
In general this way starting from v 2014:
(In your model there is nothing wrong in this node - see above)
Rafal Gaweda
Had the Same Error, But on verification it doesn't appear.
See attached Screenies
