in 1985 under the 1982 UBC. The roof purlins are 12 gage. Is it safe
to assume that these are Fy = 50 ksi? At 33 ksi, they don't meet the
loads in the General Notes. Also, would the columns and frames be A36?
A572 Gr 50 was available then, but I am not sure if that material was
used by the manufacturers. Would it have been cheaper to use thicker
and wider plates of A36 versus some material with Fy = 50 ksi.
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