Whenever you have a nonlinear analysis with gaps and/or friction, the sequence in which loads are analyzed affect analysis results because the "initial state" position is dependent on which loads were analyzed before.

For example, Earthquake or Wind loads analyzed after T1 (wind hitting the operating position of the piping) may calculate different support loads than earthquake or wind loads calculated just after GR (wind hitting the ambient position of piping). When doing a nonlinear analysis, first select Loads > Static Analysis Sets and check the option "Non-Linear".

HINT: Also refer to Load_Sequencing.pdf in the AutoPIPE XM program folder

To define all non-linear options, modify the analysis set, and check the option "Gaps/Friction/Soil", Click OK and the next screen appears, select the operating case to use for occasional loads like wind or seismic.

For more complicated load sequences uncheck the "Use Default Sequence" box to modify the Load sequence and Enter or click OK. See following screen shot:

 Attention:

Please see the following AutoPIPE help section:
Help > Contents> Search Tab> enter "Understanding Load Sequencing" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information select the hyper link for "Understanding Load Sequencing".

See Also

Bentley AutoPIPE

External Links

Bentley Technical Support KnowledgeBase

Bentley LEARN Server

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