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AutoPIPE Wiki 08. Why are restraint reactions different after disabling some Spring hangers support "Undesigned " option in AutoPIPE?
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            • 00. How to perform a spring hanger analysis in AutoPIPE?
            • 01. What load cases are use to select a spring hanger in AutoPIPE?
            • 02. How to force Spring Hanger selection to always select a spring instead of a rigid support in AutoPIPE?
            • 03. Hanger design - do we attach a sign to the cold load ie. - or + In AutoPIPE?
            • 04. Difference between a HLP and a CLP with Spring Hanger selection in AutoPIPE?
            • 05. What is AutoPIPE doing when a spring hanger is set for undesigned and ONLY Static analysis is performed.
            • 06. Why is that there is a big discrepancy between the AutoPIPE Hanger Analysis calculated values and the values that are actually on the spring cans that have been in service for many years.
            • 07. Why is that there is a big discrepancy between the AutoPIPE Hanger Analysis reported values and the Static Analysis results ?
            • 08. Why are restraint reactions different after disabling some Spring hangers support "Undesigned " option in AutoPIPE?
            • 09. How to print Spring Hanger Selection report in AutoPIPE?
            • 10. How to consider cut short when performing a Spring Hanger Selection in AutoPIPE?
            • 11. Can load variation be set to a different value, why does AutoPIPE default to 25% in spring hanger selection?
            • 12. What is the hot load on a spring hanger in AutoPIPE?
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    08. Why are restraint reactions different after disabling some Spring hangers support "Undesigned " option in AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL
    Environment: N/A
    Area: analysis
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Apr. 2016
    10.01.00.05

    Problem:

    When analyzing a model, all spring hanger supports were set to "Undesign", forcing AutoPIPE to calculate the correct spring hanger based on analysis settings during a Hanger Selection analysis.  

    Perform a Static Analysis and note the results for all restraints in the model.

    Next, uncheck the "Undesign" check box on a few, not all, of the spring hangers and rerun the Static Analysis again.  

    Compare the results for Restraint reactions to the previous analysis results, note that they are different, why?

    Solution:

    When ever faced with a problem like this, comparing the results of one analysis to another analysis, best to create a complete model input listing report and complete model output report with all sub reports Enabled / checked ON, then compare these reports to be sure that everything is as suspected or if items were inadvertently changed by the user or program. See the following WIKI here to create and compare these reports. 

    In this case, pay special attention to the remaining spring hangers that still have "Undesign" enabled / checked ON. Be sure to compare the results of the Spring Hanger selection reports for these spring supports to the original report values; note the difference, WHY?

    The difference is based on how the Hanger Selection Procedure process is performed, See AutoPIPE help for Hanger Selection Procedure "hot load design method" or "cold load design method".  This will provide detail of how the the Hanger analysis is performed. The results from the hanger analysis is then used in the Static Analysis. In the first go around where all spring hangers were set to "Undesign", the program calculated the correct spring rate at each support. On the second go around after some of the spring supports were removed from the hanger selection, this affected the Hanger Analysis procedure and thus results are different .

    See Also

    Spring Hanger Selection

    Bentley AutoPIPE

    • AutoPIPE
    • Spring Hanger Selection
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Tue, Apr 19 2016 1:04 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Tue, Aug 22 2017 1:09 PM
    • Revisions: 6
    • Comments: 0
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