Applies To Product(s): AutoPIPE Version(s): 2004, XM, V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Date Logged & Current Version May 2015 09.06.02.06 Problem: Per AutoPIPE's online help for ASME B31.3 - 2008, Stresses Due to Occasional Loads, equation I.4-4 indicates that AutoPIPE first calculates the SRSS of the occasional load moments, and adds the result to SL . How does AutoPIPE know which of the loads in the “User Code Combination” window is to be considered an Occasional Load(s)? as I want to combine the effects of (SUS) + Wind + Ice load in a new user combination where "U1" load case is a Sustained Load and I only want "W1" load case to be an Occasional Load used in the calculation of Mio and Moo in the equation. How can I control this? Answer: As mentioned above, all basic load cases, e.g. GR, T1, W1, U1 etc have only moment results and hence (S) does not apply. Suggest creating a new combinations where the ice load (U1) is added to the SUS load case: Then create a combination combining the effects of (SUS+Ice) + Wind: Where the stresses (Sus and Ice) are added into the equation under S and the occasional W1 moments are summed by SRSS in the code equations: 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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