| Applies To | |||
| Product(s): | AutoPIPE | ||
| Version(s): | 2004, XM, V8i, CONNECT; | ||
| Area: | Analyze | ||
| Original Author: | Bentley Technical Support Group | ||
| Date Logged & Current Version |
Jan. 2016 10.00.00.10 |
Problem:
Review various scenarios below:
Solution:
Scenario #1:
From a specific user's model with only 2400 node points, analysis took 43 min to run:
Load cases analyzed ................... GR T1 T2 W1 W2 W3 W4 P1 P2 SN
This seems a little excessive for this number of node points. Note, this model combines a STAAD file into AutoPIPE using PipeLINK.
Answer:
After reviewing this specific model, AutoPIPE does take a considerable amount of time to perform an analysis. After testing, the multitude number of beams in this model have a much higher effect on the analysis time than the piping nodes.
AutoPIPE is simply requiring a lot of cycles for stiffness decomposition. This exact number of cycles or lines of code required to iteration of a load case for non-linear is in the neighborhood of tens of billions of lines of code per iteration of any one load case. Therefore, the calculations for a model with both pipes and beams is very CPU intensive, which would explain why the analysis take so long.
Another way of saying this; the stiffness matrix reduction driver (subroutine factor) is what takes the most time to compute, and it is iterated many times during analysis of a particular model.
However, every model is different, if you have a model that is taken a considerable amount of time for no apparent reason, log a Bentley Service Request, included an AutoPIPE APC file, and mention this WIKI page
Workaround:
One possible solution would be to increase the force and or displacement tolerance in the nonlinear analysis dialog in an effort to reduce the number of iterations required for each load case.
Scenario #2:
If a model is opened in AutoPIPE from a network drive and analyzed, there is a long pause between analysis sets. This does not happen when the model is opened from a local drive. Any suggestion of a workaround.
Answer:
It is important to clarify that any issues related to a company's network fall beyond the scope of AutoPIPE's responsibility. Such matters must be resolved in collaboration with the company's IT departments.
Meanwhile, know that when AutoPIPE opens a model in the program, the following occurs:
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- New Folder is created in user's profile Temp folder.
- All of the application files generated are temporarily stored here.
- Periodically when the application is running and when the model is closed all files are written to the model's "Save to" location.
- If AutoPIPE closes any other way, the temp files will remain until manually removed.
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2024-12 - Further comments will be posted soon.
Scenario #3: