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AutoPIPE Wiki 02p. "Time History" (M1-M50) - AutoPIPE Load Case
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    02p. "Time History" (M1-M50) - AutoPIPE Load Case

    Comments, Questions, and Answers:

    Note: see additional comments about Time history analysis in AutoPIPE on the following WIKI's:

        • Water Hammer (Time History) Example - Modeling Approach in AutoPIPE

        • Dynamic Analysis - Time History load case in AutoPIPE

    Item #1:

    On the Load> Time History Location dialog screen, change value at node (ex. C14 N) from Dy = -1 to Dy = -10 and there is no change in the results, but if change Dy = 0, there is a change in the results. Why?

    Answer: From the online help:

       DX/DY/DZSpecify the direction cosines or offsets of the time history
                load (i.e., values of 1,0,0 would specify the X-direction as the direction at
                which the time history load is applied.

    Therefore, changing Dx =0, Dy = -1, Dz = 0, to Dx =0, Dy = -10, Dz = 0, has no affect on the direction cosines, the load is still going to be applied in the -ve Dy direction regardless if Dy in this case is any  number -1 to -infinity.

    In addition, by setting Dx =0, Dy = -1, Dz = 0, to Dx =0, Dy = 0, Dz = 0, will have a significant change on the results as there is now no directional cosine specified for the load.

    If there was another direction with a value, Dx =1, Dy = -1, Dz = 0, to Dx =1, Dy = -10, Dz = 0, is a significant change in the directional cosine. Thus changing the results.

    . 

    See Also

    Bentley AutoPIPE

    • Load Case
    • analysis
    • time history
    • AutoPIPE
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Fri, Nov 1 2013 1:31 AM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Tue, Jun 18 2019 6:38 AM
    • Revisions: 16
    • Comments: 0
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