Hi,
I am modelling a reinforced concrete floor slab on columns and am getting the following message on running the Load History Deflections:
"An error occurred while trying to calculate load history deflections. Pardiso internal - unstable structure"
The "calc all" analysis runs without problem, moments and shear forces are as expected and the load history deflection has previously been completed successfully on the same model. Nothing has changed in the model but I am now getting this error message!
Any ideas what could be causing the problem and how I can remedy it?
Many thanks,
James.
I suspect that during the iterative analysis performed for load history calculations, the slab in one location is softened o the point that things become instable.
Review the “Load history calc log” for details; it may give you a clue as to where it stops.
Review the manual, section “64.4 Element stiffness adjustments” for details on what some of the potential warnings mean.
You might adjust the convergence tolerance or other Load History settings on the Criteria – Calc Options screen to get it working.