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AutoPIPE Wiki 09. Support forces for Occasional load (i.e. Earthquake) are not evenly distributed among multiple supports in AutoPIPE model, why?
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                • 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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    09. Support forces for Occasional load (i.e. Earthquake) are not evenly distributed among multiple supports in AutoPIPE model, why?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Area: Results
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    April. 2017
    11.00.00.22

    Problem:

    Support forces for Occasional load (i.e. Earthquake) is not evenly distributed among supports in AutoPIPE model, why?

    Example: 

    For the give model subjected to a static earthquake load:

    Support results are: 

    Why are they not all even?

    Solution:

    AutoPIPE calculates the force on the supports dues to Static Earthquake load as Mass x Acceleration. Because the pipe has Line stop supports at different intervals and pipe size are changing along the pipeline length (12"to 14" to 20" to 36" dia) directly affects the mass / force applied to a particular support. 

    If the modeled pipeline was created with one pipe size and all the supports are evenly spaced so the same mass was applied to all the supports, than, Yes, the support loads would all be the same, see Seg A below:

    See Also

    "Support" sub report using Results> Output Report

    Bentley AutoPIPE

    • Loads on support
    • AutoPIPE
    • support
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Thu, Apr 20 2017 2:56 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Apr 16 2018 12:58 PM
    • Revisions: 2
    • Comments: 0
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