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AutoPIPE Wiki 03. During animation of load-case in AutoPIPE, pipe support moved with pipe freely without any opposition, why?
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              • -"Support" sub report using Results> Output Report in AutoPIPE
                • 01. What is the difference between the support and the restraint output reports in AutoPIPE?
                • 02. Why are Membrane or Local stresses from pipe supports not included in AutoPIPE?
                • 03. During animation of load-case in AutoPIPE, pipe support moved with pipe freely without any opposition, why?
                • 04. Support report indicates a load on a support who's open gaps never closed during an AutoPIPE Analysis, so why is there a load on the support in open gap direction?
                • 05. Support results on a vertical support in an AutoPIPE model does not change, regardless of "Weight of Contents" settings. Appears Weight of Contents is not considered in my model, how to verify?
                • 06. AutoPIPE FAQ Question 116: Why are membrane stresses from pipe support not included in AutoPIPE?
                • 07. AutoPIPE's Support sub-report results indicate little to no displacement at a Support that has large gaps all around, WHY?
                • 09. Support forces for Occasional load (i.e. Earthquake) are not evenly distributed among multiple supports in AutoPIPE model, why?
                • 10. How are a support's axial force due to xxx load case calculated in AutoPIPE's reports?
                • 11. Pipe displacement decreases as gap size increases in AutoPIPE, why?
                • 11. Support forces = 0.00 in AutoPIPE's results, why?
                • 12. Support Forces Report, why do local support forces on a global axis not match global forces in AutoPIPE's output report?
                • 13. Why are spring or rigid hangers on vertical legs showing large reaction loads in the Hydrotest load set case for AutoPIPE's reports?
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    03. During animation of load-case in AutoPIPE, pipe support moved with pipe freely without any opposition, why?

    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).

    See Also

    "Support" sub report

    Bentley AutoPIPE

    • error
    • AutoPIPE
    • support
    • Report
    • displacement
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Tue, Jun 9 2015 6:09 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Apr 16 2018 12:33 PM
    • Revisions: 7
    • Comments: 0
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