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AutoPIPE Wiki 05. If the Harmonic imposed displacement forcing function is applied to an anchor, why is that anchor not displaced the amount in the Displacement report for that AutoPIPE Harmonic load case?
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              • 05. If the Harmonic imposed displacement forcing function is applied to an anchor, why is that anchor not displaced the amount in the Displacement report for that AutoPIPE Harmonic load case?
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    05. If the Harmonic imposed displacement forcing function is applied to an anchor, why is that anchor not displaced the amount in the Displacement report for that AutoPIPE Harmonic load case?

    Applies To
    Product(s): AutoPIPE
    Version(s): All
    Environment: N/A
    Area: Analysis
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Nov. 2015
    10.00.00.10

    Problem:

    If the Harmonic imposed displacement forcing function is applied to an anchor, why is that anchor not displaced the amount in the Displacement report for that Harmonic load case?

    Example:

    A10 is an anchor, on the Harmonic Load dialog screen, set Input = Impost displacement, Dy = 5.0 inch

    Analyze, and Review results displacement report

    why is movement at A10 = 0.00 for all directions.

    Solution:

    Harmonic loads applied to a support (i.e. anchor) may not present the correct restraint reactions without ZPA and / or missing mass enabled.

    Additional information:

    1. All non-force harmonic inputs are converted to displacements, then to forces using the stiffness matrix of the anchor. It is this force that is then applied to the structure.

    2. AutoPIPE's missing mass is applied to the structure based on the theory of Old Edvard Hansteen in his article titled "On the accuracy of mode superposition analysis in structural dynamics".

    See Also

    Dynamic "Harmonic" Analysis

    Bentley AutoPIPE

    • Load Case
    • harmonic
    • AutoPIPE
    • Impose Displacement
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Wed, Dec 2 2015 3:52 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Jan 9 2017 5:01 PM
    • Revisions: 3
    • Comments: 0
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