Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Load Cases Subarea: Original Author: Bentley Technical Support Group Comments Questions and Answers related to the "Combination Options" button on the Combinations dialog screen in AutoPIPE On the Tools Combinations dialog, pressing the "Combinations Options" displays a list of options: (Per AutoPIPE V8i 09.06.00.19) Add default Non-Code combination Add Negative Occasional Cases Disable Auto Code Combinations Disable Auto Non Code Combinations Do not show set 1 in name Show only HDPE Combinations Generate default non-code descriptions Hide non printed combinations Import Combination File See online AutoPIPE's help for details on each feature. Item #1 We have used seismic E3 (+X), E4 (+Y), E5 (+Z) and W1 (Wind +X N -S), & W2 (+Z, E-W) direction load cases. Calculations were performed an a Linear analysis, On the non-Code Comb. We are also using combination option - "Add negative Occasional cases". We thought this will perform combination like GR+E1 or GR+W1 and GR-E1 or GR-W1. But looking at Restraint reactions it does not show correct results. It gives “-4” for both direct ions in Z direction. Are we doing something wrong? Answer: As mentioned in the online help for "Add Negative Occasional Cases" If this option is selected, the program will generate default Non-Code combinations for negative occasional load cases in addition to the default Non-Code combinations for positive occasional load cases of seismic and wind only, i.e. GRTP1+W1, GRTP1-W1, GRTP1+E1, GRTP1-E1, etc. Additional comments for this particular issue, the model was constructed with small bore piping (i.e. OD = 2.375") over 4 different segments (Seg A-D). In this model, Wind was found to be only applied to segment D (i.e. a very small pipe segment). Model Input Listing report, Load Summary Data Listing sub-report, There is not enough surface area for the wind to really affect the model. Confirm Wind should be applied to the entire model or just this small segment. Make the necessary adjustment to the Wind load case. 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! Combination Options
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