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AutoPIPE Wiki 05. Why are SAM results different even though applying the exact same Response Spectrum load cases in AutoPIPE?
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            • 01. How do I know SAM displacements are in phase or out of phase in AutoPIPE?
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            • 03. What the benefit of including different groups in different SAM cases on the Response Spectrum tab of the Dynamic Analysis dialog in AutoPIPE?
            • 04. Why does SAM results appear to be always +ve (positive)?
            • 05. Why are SAM results different even though applying the exact same Response Spectrum load cases in AutoPIPE?
            • 06. Does friction affect SAM analysis results in AutoPIPE?
            • 07. Evaluate the impact of SAM combined with Dynamic analysis in AutoPIPE
            • 08. How are "Sustained + Earthquake + Seismic Displacements" combined in an AutoPIPE model?
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     Questions about this article, topic, or product? Click here. 

    05. Why are SAM results different even though applying the exact same Response Spectrum load cases in AutoPIPE?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Environment: N/A
    Area: Load Case
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Sept. 2016
    10.01.00.09

    Problem:

    Give 2 models with 6 different results. 3 supports have one response spectrum and other 3 supports have a 2nd different response spectrum applied.

    Model #1:  1st 3 supports are assigned to Support Group #1 with Response Spectrum A, 2nd set of 3 supports are assigned to Support Group #2 with Response Spectrum B.

    Model #2:  1st 3 supports are individually assigned to Support Group #1, #2, #3 respectively with Response Spectrum A, 2nd set of 3 supports are again individually assigned to Support Group #4, #5, #6 respectively with Response Spectrum B.

    Should dynamic results for both analysis match exactly, Yes or No?

    Why?

    Solution:

    No, the dynamic results from both models should not match. 

    Why, see AutoPIPE help "Seismic Anchor Movement Analysis":

    The following procedure is used to obtain the SAM results:

    1. The global X seismic movements are applied only to the supports and anchors which are specified with the first phase. The supports and anchors associated with the other groups remain fixed. The response of the piping system (forces and moments, support reactions, etc.) is computed for this condition. .....

    ......

    5. The final response is calculated by combining responses of the global X, Y and Z directions using the SRSS combination method.

    See help for complete details on this feature.

    Again, it's not the response input that's the question, it's the method of application, which is different for the two scenarios. For this reason, the results maybe close but will not exactly match.

    See Also

    "Sam" (Seismic Anchor Analysis)

    Bentley AutoPIPE

    Seismic Anchor Movement Analysis

    • different
    • results
    • AutoPIPE
    • Response Spectrum
    • SAM
    • Difference
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Mon, Sep 26 2016 6:19 PM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Sep 26 2016 6:27 PM
    • Revisions: 4
    • Comments: 0
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