Problem:

As an example, if an AutoPIPE Model had 3 analysis sets configured, user would only enable 1 of the 3 analysis set to be analyzed at any one time. Then cycle to only running Analysis Set #2 by itself, and finally selecting Analysis Set #3 and analyzing it by itself.

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Next, generate the results from running all 3 Analysis sets at the same time.

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Why are the results from these 2 procedures not exactly the same?

Solution :

To answer questions like this best to start your research using AutoPIPE help, search for "multiple analysis sets". Suggest reviewing the following section headings:

• • Case/Combination List (Standard)
  • Combinations
  • Rules for Creating User Combinations
  • Use min. sustained margin
  • etc..

This will explain when analyzing multiple analysis sets at the same time, certain type of loads takes a conservative approach for category maximums like (SUS), (EXP), (OCC) etc. takes the maximum stress across all analysis sets.

Although there may be some differences in the code compliance results based on multiple vs single analysis sets. As far as the individual load case (not load combination) results (displacement, forces and moment, reactions) are concerned, there should be no differences on how you perform the analysis or how many analysis sets are analyzed.

Lastly, the code allowable will be calculated per information mentioned in AutoPIPE help. These calculations may vary when analyzing 1 analysis set vs multiple analysis sets at the same time.