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AutoPIPE Wiki 06. Gravity + Thermal + User load cases added together give incorrect Restraint Report results in AutoPIPE, why?
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    06. Gravity + Thermal + User load cases added together give incorrect Restraint Report results in AutoPIPE, why?

    Applies To
    Product(s): AutoPIPE,
    Version(s): ALL
    Environment: N/A
    Area: Reports
    Original Author: Bentley Technical Support Group

    Dec 2014, AutoPIPE V8i 09.06.01.10

    Problem:

    To summarize, I have a gravity case, a thermal case, and a user case. My gravity case, for example, shows a -1224 pound force acting on my v-stop (compression only) support. Both my thermal and my user case actually cause the valve that is being supported to lift up. If I look at the Thermal case, I observe a "fake" reaction load of +1224 pounds at the v-stop. I understand the purpose of this is so that when Gravity + Thermal are actually added together, the net reaction force is 0 pounds. The same situation occurs with my User case (a fake reaction load of +1000 pounds).

    The problem that results from this is when I combine Gravity + Thermal + User 1. Th e resulting reaction force at the v-stop is a +1000 pound force. Thus, this turns my compression only support into a tension support as well, but only up to the magnitude of the gravity reaction. I don't foresee this drastically changing my analysis, but it does present inaccurate loading in my supporting frame.

    Solution:

     There is no indication if this model is being run as a Linear analysis or Non-Linear analysis. 

    Assuming non-Linear analysis as the pipe is clearly moving off the support, suggest that you modify the "Initial case for Occ. loads" from Gr to OP1...OPn.

    Under Load> Static Analysis results> See column labled "Initial State Occasional", set this value to OP1 - OPn (select a value other than GR). Re-run your analysis and review your results.


    See AutoPIPE Help for details on this command.

    See Also

    "Forces & Moments" sub-report

    Bentley AutoPIPE

    • Forces and moments
    • AutoPIPE
    • support
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Dec 15 2014 7:10 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Apr 16 2018 12:22 PM
    • Revisions: 9
    • Comments: 0
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