Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: results Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers about dynamic support forces in AutoPIPE Items #1 Question: AutoPIPE: Dynamic Results Interpretation A. My question is how come the code compliance section does not include both the positive and negative dynamic results (ie GRTP# +/- R#)? Is there a way to do that? OR B. Also, I am confused about how to interpret the local and global forces for the combinations which contain the dynamic support load. Why are the local forces for the dynamic load given as +ve? TR Number: None Product: AutoPIPE Version: n/a Area: General Problem ID#: 74535 Keywords: R1 - R50 Response spectrum cases 1 to 50 H1 - H10 Harmonic cases 1 to 10 M1 - M50 Time history cases 1 to 50 F1 - F10 Force spectrum cases 1 to 10 S1 - S10 Seismic Anchor Movement cases 1 to 10 Answer : All dynamic results in AutoPIPE are positive. Since it is the maximum absolute value of the oscillating response. By reviewing All AutoPIPE dynamic results for the following are reported as positive numbers: ...R1 - R50 Response spectrum cases 1 to 50 ...H1 - H10 Harmonic cases 1 to 10 ...M1 - M50 Time history cases 1 to 50 ...F1 - F10 Force spectrum cases 1 to 10 ...S1 - S10 Seismic Anchor Movement cases 1 to 10 For more details on this subject please see the following AutoPIPE help section: A. Help Contents Contents Tab Reference Information Results Interpretation Select the "Results Interpretation Overview" link, at the bottom of the listing select "Dynamic Support Forces" link, read the entire section for complete details and workaround. B. Help Contents Contents Tab Reference Information Analysis Considerations Modal Analysis Modal Analysis. Workaround: Crate additional User combinations using -1.0 Factor with the Dynamic load case. For example R1 is defined as shown below with respective displacement of vertical pipe anchored at the bottom: Create a new user combination as followed, NOTE: the -1.0 factor with respective displacement of same vertical pipe anchored at the bottom: Item #2 See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
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