Posted by: corne
load cases: using combination of W and WNC to get EXP case - 08/25/10 12:45 PM
Hi all,
I've some experience in load cases, think of hot sustained, all kinds of OCC combinations and EXP cases.
But now the following issue.
I have a system where the highest secondary stresses in the + direction are from a load case with W (for example W+T1+P1+D1). The highest secondary stresses in the - direction are from a load case with WNC (for example WNC+T2+D2).
How to make a good EXP load case to get the full stress range?
Let's assume:
L1 = W+T1+P1+D1 (OPE)
L2 = WNC+T2+D2 (OPE)
L3 = L1-L2 (EXP)
This is not true cause actually L3 = (W-WNC) + P1 + (T1-(T2+D2)), so combining primary and secondary stresses.
How can I best make load combinations to get the actual secondary stress range from L1 to L2?
Thanks in advance for your replies.
Corné
I've some experience in load cases, think of hot sustained, all kinds of OCC combinations and EXP cases.
But now the following issue.
I have a system where the highest secondary stresses in the + direction are from a load case with W (for example W+T1+P1+D1). The highest secondary stresses in the - direction are from a load case with WNC (for example WNC+T2+D2).
How to make a good EXP load case to get the full stress range?
Let's assume:
L1 = W+T1+P1+D1 (OPE)
L2 = WNC+T2+D2 (OPE)
L3 = L1-L2 (EXP)
This is not true cause actually L3 = (W-WNC) + P1 + (T1-(T2+D2)), so combining primary and secondary stresses.
How can I best make load combinations to get the actual secondary stress range from L1 to L2?
Thanks in advance for your replies.
Corné