Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group The "Code Compliance" grid displays the combination set defined for piping code compliance (both the default combinations and user-defined sets). Any default code combination may be modified, deleted or reset and any new user combination created and modified in the same grid. User Code Combinations dialog Comments, Questions, & Answers: Item #1 I wish to define the allowable hoop and longitudinal stresses for a user code combination that i have set up. Answer: Per the online help: The Allowable Stress field on the "Code Comb." tab of the Load Combinations dialog enables the user to define the allowable stress for any Code Compliance combination directly. Select Tools Combinations Code Comb. TAB, uncheck and modify the values in the Allowable Stress column. Notes: This field is only enabled when the "Auto Update" check box option is disabled (checked OFF). Item #2: What is the M/S column for? Answer: under construction Item #3: When creating a new User defined combination on the Code Comb tab, is the order of the load cases / combinations of any consequence? Answer: Press the NEW button to create a new user code combination. This will display the following dialog screen: Where the user can add up to 10 load cases and combinations to create a new combination. There is NO consequences to order of load cases like that used with a Non-linear analysis. Item#4: 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: Item #5: Are predefined stress category maximums [i.e. (LONG), (Sus), (exp), (0cc), (hoop) ] calculated across all analysis set regardless of load cases turned ON / OFF in any one analysis set? Answer : The short answer is, YES. It is based on all load cases configured in the model. However, there is a way to force the program to utilize a specific load case for calculating the predefined stress category maximums [i.e. (long) ] for each analysis set. Please see the NOTES written on the following AutoPIPE help section: Help Contents Search Tab enter " Case/Combination List (Standard)" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. Note: A. To become more comfortable with user combinations, create example model(s) with one or more analysis sets with one or more "Number of operating load conditions" in each analysis set. Review the results from the different model s to understand specific user combinations. May need to create a user combination with only 1 load case to see what results are being used by the program. Example, code Combination name = long, see image below: B. If pressure extension analysis is turned on, and the result model option "Include axial, Pcase in Sus" is also turned on, then the forces and moments from pressure case shall be incorporated while calculating sustained stress. Item #6: Advise how to get the range of T1, T2, T3, ...,Tn thermal load cases. The option RANGE is missing from actual AutoPIPE Capabilities (Combination Method). Answer: From the online help: The program will automatically create a special code combination called "Max Range" that stores the results of the maximum thermal range stress case, e.g. T1 to T3, including thermal ranges from ambient temperature, e.g. Amb to T1. This option is useful when the maximum expansion stress due to thermal range loadings only is required rather than generating every thermal range code combinations explicitly. In order to see all the thermal ranges, select "Tools Model Options Results "No. of thermal ranges" option (see image below). In addition see online help for details on these options. After the settings are enabled with the correct number of thermal cases, these load combinations will be available for inclusion into other combinations as required. Item #7: How to automatically find the MAX load case from a group of load cases in an AutoPIPE model Item #8 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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