This log can be accessed from the Study Tasks pane at any time during or after the analysis.
Analysis Progress Table
The following columns are displayed in the Warp analysis log progress table:
- Kstep
The non-linear analysis load step number
- Kstra
Indicates the strategy used for the solution
- Nref
The number of reformations of the stiffness matrix at each step
- Nite
The number of iterations in each step
- Ipos
- Negpv
This is the negative diagonal term in stiffness matrix after LDL decomposition.
- Detk
This is a relative measure of the stiffness of the structure. This value is always one on the first step, so values larger than one indicate increasing stiffness.
- Rfac
The fraction of load applied at a step. It is important to check that the last step is 1.
- Displacement
Indicates the node displacement in the Z-direction at each step.
Convergence Failure
Sometimes the following messages can occur in the progress table:
* CONVERGENCE FAILURE *
or
* DIVERGENCE OCCURRED *
When you see these warnings, look at the second column from the left (Kstra), which shows the different strategies used during the analysis. If the last value of Kstra in the progress table is in the range 0-4, then the solution will be satisfactory. If it is 5, this indicates that the Structural analysis program has given up equilibrium iterations, and the results will probably be unreliable.