Hi:

I am need some understanding of the extreme displacement stress range. If B31.3 requires you to evaluate the largest displacement stress range (per para 319.2.3), then why is this load case not a recommended /default load case by CAESAR II ? Is the max displacement stress range load case mandatory or not ? Also I would like to confirm: Is the max displacement stress range used to calculate the stress reduction factor "f" which subsequently affects the expansion stress allowable SA? Does that mean if we don't set up the extreme displacement stress range load case, then my allowable is not calculated correctly ?

Thanks