| Applies To | |||
| Product(s): | AutoPIPE | ||
| Version(s): | 2004, XM, V8i | ||
| Area: | Code Combinations | ||
| 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?
Solution:
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: