| Applies To | |||
| Product(s): | AutoPIPE | ||
| Version(s): | All | ||
| Area: | Combination | ||
| Original Author: | Bentley Technical Support Group | ||
| Date Logged & Current Version | Nov. 2015 10.00.00.10 |
Suggested procedure to add the effects of movements from sources other than thermal loading in displacement combinations:
Create the combination to cater for the thermal expansion range. For example:
T1 is your cold load
T2 is your operating load
Create the user code combination as under:
Combination name: T1-T2
Combination method: 1 Sum
Category: Expansion
|
Case/Comb |
Factor |
M/S |
|
T1[1] |
1.00 |
M |
|
T2[1] |
-1.00 |
M |
Create the combination to cater for movements from sources other than thermal which needs to be included in the displacement stress range. For example:
U1 for hogging type movement aboard a ship
U2 for sagging type movement aboard a ship
Create the user code combination as under:
Combination name: U1-U2
Combination method: 1 Sum
Category: Expansion
|
Case/Comb |
Factor |
M/S |
|
U1[1] |
1.00 |
M |
|
U2[1] |
-1.00 |
M |
Once there are two different combinations, they can be combined by using Sum or Abs Sum. One could also combine these two at the stress level:
Combine the two user combinations at moment level (moment values from the two combinations would be combined and a single stress value will be calculated using the combined moment values):
T1-T2 is your thermal displacement range
U1-U2 is your non-thermal displacement range
Create the user code combination as under:
Combination name: (T1-T2)+(U1-U2)
Combination method: 1 Sum or 2 Abs Sum
Category: Expansion
|
Case/Comb |
Factor |
M/S |
|
T1-T2 |
1.00 |
M |
|
U1-U2 |
1.00 |
M |
Combine the two user combinations at stress level (stress values from the two combinations would be added together):
T1-T2 is your thermal displacement range
U1-U2 is your non-thermal displacement range
Create the user code combination as under:
Combination name: ST(T1-T2)+ST(U1-U2)
Combination method: 1 Sum
Category: Expansion
|
Case/Comb |
Factor |
M/S |
|
T1-T2 |
1.00 |
S |
|
U1-U2 |
1.00 |
S |
The details of these summation methods are provided. It will be up to the user to decide what they think would work best according to the specific scenario and which method of combining the two effects would be most suitable.