Dear All,
I'd like to hear your opinions on this matter.
If I consider load components - W, P1, T1 and U1, I can establish loadcases considering alterate SUS cases as follows:

L1 W+T1+P1.........OPE
L2 W+P1............SUS ALT.(L1)
L3 W+T1+P1+U1......OPE
L4 W+P1............SUS ALT.(L3)
L5 W+P1............SUS
L6 L1-L2...........EXP
L7 L1-L5...........EXP
L8 L3-L1...........OCC
L9 L8+L2...........OCC
L10 L8+L4...........OCC
L11 L8+L5...........OCC

From the above, my understanding and questions are as below, please let me know if my understaing is incorrect.

1. SUS stress : L2 and L5 shall be checked but not L4
2. EXP stress range : L7 shall be checked rather than L6 so that L6 shall be deleted.
3. OCC stress : I feel L9 and L10 make sense but not L11. But I can't imagine which one(L9 or L10?) should be checked. Please let me know if L4 and L10 are required.

my opinion:

L1 W+T1+P1.........OPE ---OPE restraints and displacements
L2 W+P1............SUS ---SUS stress, restraints and displacements
L3 W+T1+P1+U1......OPE ---OPE(U1) restraints and displacements
L4 L1-L2...........EXP
L5 L3-L1...........OCC
L6 L5+L2...........OCC ---OCC stress

just for reference!

In my opinion...
1. Agree, the stresses from L4 will be handled by the related SUS+OCC evaluation.
2. Agree
3. I might run a MAX combination of all the SUS cases and then just add these MAX SUS to each OCC to evaluate SUS+OCC.

Thank you, Dave,

In OCC case, I agree that max.SUS will be used to evaluate SUS+OCC cases. But, do you think L4 from the above example is necessary to evaluate SUS+OCC? In other words, which one is reasonable for max.SUS, L9 or L9' from the below?
L1 ~ L8 : same as the above example
L9 max(L2, L4, L5).....SUS
L9' max(L2, L5).........SUS
L10 L8+L9(or L9').......OCC

The Codes do not offer direct guidance in this matter. It is the engineer's responsibility.
In my quick opinion, your load case 8, by subtracting L1 from L3, will throw all the nonlinear issue into the occasional load case - both sustained and occasional. Since L8 is added to the maximum sustained, you may be overly conservative in including a higher stress in both the sustained and occasional stress - you may be "double-booking" that higher value. So, L9 or L9'? Because of this "double-booking" I would lean towards L9'. But these observations may be model dependent so I would continue keep a skeptical eye on any general conclusions as we build experience with this approach.

One note on my previous post here, I suggest running a MAX SUS case. This MAX SUS can then be used with the OCC case rather than running OCC with each SUS case (e.g., L9, L10 & L11 in your original post above).

Hi Dave,

I came to have another opinion for SUS and combination of SUS+OCC.
As Sh can be determined at the temperature of operating condition being considered (even though min.Sh is considered as a default by CAESAR II), each SUS cases can be evaluated separately against each corresponding Sh therefore, no max.SUS case is not necessary. In the same manner, L9 in my originbal post above may make sense if OCC load occurs in T1 case.

In summary, I think we can consider the following;

L1 W+T1+P1.........OPE
L2 W+P1............SUS ALT.(L1)
L3 W+T1+P1+U1......OPE
L4 W+P1............SUS ALT.(L3) => DELETE
L5 W+P1............SUS
L6 L1-L2...........EXP => DELETE
L7 L1-L5...........EXP
L8 L3-L1...........OCC
L9 L8+L2...........OCC
L10 L8+L4...........OCC => DELETE
L11 L8+L5...........OCC => DELETE

Would you please let me know if any code violation in the above implementation?

For sustained stress calculations - if you can guarantee that L2 produces the largest sustained stress at all points for all support conditions, then I think you are OK.