| Applies To | |||
| Product(s): | AutoPIPE | ||
| Version(s): | All | ||
| Area: | Results | ||
| Original Author: | Bentley Technical Support Group | ||
| Date Logged & Current Version | June 2015 09.06.02.06 |
Problem:
When reviewing the results of a guide support with gap in the horizontal (global X-dir) and vertical (global Z-dir) set to 0.00 inches during a non-linear analysis, noticed that the support was moving with the pipe.
Deflected shape for T1 load case:
How can this be happening?
How to fix it?
Solution:
There are two main reason why this will happen:
1. The Support Stiffness is 0.00
2. The model is corrupted, but may be able to be fixed.
Reason #1:
Check the Support tab on the Input grids see the "Rate/Stiff" column or open the Support Dialog screen, check the "Stiffness" settings:
Note: A support with a Stiffness = 0.00 (as shown above) will offer no resistance to the pipe movement.
Avoidance: Enter a suitable value or set to "Rigid"
Reason #2:
When reviewing Tools> Model Input listing, Extended Component sub report, the following was found in multiple PipeID's in the model : "NaN"
Note: Something has happen to this model and the results should not be trusted while "NAN" can be found in a complete output report with all applicable sub-reports checked ON or while searching a complete model input listing report.
If you encounter this issue, please try to write down exactly how this was accomplished or provide as much model history as possible (created in what version, how was the model created, import , copy clip, what commands were in use, etc..) then create a Bentley Service Request , and send the details with your model APC file (File> model management> Save Archive> *.APC) for review.
Avoidance:
there are 2 solutions to fixing this issue:
Option #1:
a. Open the model in AutoPIPE
b. Select the Pipe Property Tab from the Input grid
c. Scroll to the the right on this tab until the "Pipe material" column can be seen.
d. Change the material from the original setting to another selected material in the library for each PipeID in the model
e. Change the pipe material back to the original setting for each PipeID in the model.
f. Perform an analysis, search both a complete output and model listing report for NAN.
Option #2:
a. Open the model in AutoPIPE
b. Select the Pipe Property Tab from the Input grid
c. Scroll to the the right on this tab until the "Cladding Density" column can be seen.
d. Change the density value from the original setting to another value for each PipeID in the model
e. Change the density value back to the original setting for each PipeID in the model.
f. Perform an analysis, search both a complete output and model listing report for NAN.
After performing the above avoidance, both the results and deflected shape are corrected.:
The CAE development team is reviewing the program in hopes of preventing this in future versions of the program (AutoPIPE V8i 09.06.01.xx and higher).