When analyzing a model the following occurs:
--------------------------- Confirm --------------------------- The load case did not converge. Do you wish to continue iterating? --------------------------- Yes No Cancel ---------------------------
What should I do?
Selecting YES: The program will re-run the analysis for more iterations in hopes of converging below the non-linear tolerances specified.
The default number of iterations is 30, If it was determine that 31-99 iterations enabled the analysis to converge, make this a permanent change by changing the Nonlinear analysis> Maximum iterations settings, as shown below
Then each time an analysis is performed it will use the updated number of iteration thus reducing likely hood that the message above will be displayed.
Selecting No: Stops the analysis procedures and presents the following:
--------------------------- Confirm --------------------------- Do you want to see .LOG file for magnitude of unbalance error? --------------------------- Yes No Cancel ---------------------------
Selecting Yes: AutoPIPE Viewer is automatically displayed with the *.LOG for review.
Selecting No: The dialog is closed and user is able to enter the next AutoPIPE command.
Selecting Cancel: The dialog is closed and user is able to enter the next AutoPIPE command.
Some more converging solutions for buried piping are to first try using nonzero K2 values in order to avoid unlimited displacements. Using larger K2 values temporarily (K2=K1/1000 or so) can help you see if P1 values are sufficient by checking displacements. By setting K1, K2, P1 to 0.01 N/m and 0.001 M/mm/mm, the model should converge with no problem
May need to add concentrated or distributed weight to submerged pipe to prevent it from uplifting (in practice concrete mats are added in some cases
Try using V-Stops at a reasonable spacing (that will make it pass the sustained stress check). You may have to use large friction factors (0.5 to 1.0) for these supports
Confirm Messages displayed in AutoPIPE
Bentley AutoPIPE