HI,

I used to combine all my occasionnal load cases with the operating cases:
L1 = OPE+Wind
L2 = L1-OPE
Finaly L3 = L2+SUS

But in my new job, the senior piping engineer doesn't combine Wind with the operating load case :

L1 = WIND
L2 = L1+SUS

I don't know wich one is the correct combination. And i saw on the coade forum that we don't have to combine with operating if we have non linear bondary condition. But I don't know what is non linear bondary condition.

Can anyone help me?

Thanks