I want to check the capacity of some existing steel columns that are TS7x7x3/8. The building was constructed in 1982. Does anyone have a reference that would specify the minimum yield stress of this shape for this time period?
No problem. If your company is a member of AISC, I strongly suggest you download all of the design guides. Even if you don't think you need them now, they are very valuable to have around. And just knowing what they have is helpful.