1930 steel beam
1930 steel beam
(OP)
I am reviewing a building built in 1930 that has some 24" high steel beams. When did the AISC start using the W deesignation? Is there a way to determine what beams match up with the existing profiles and what strength designation was in effect?






RE: 1930 steel beam
You can download a spreadsheet from the AISC website that has all of the shapes from then until now. Using that tool, you can determine which new beam suitably matches the old one.
My first printing, second edition AISC manual, dated 1/1934, calls for A9 steel for buildings and A7 steel for bridges (both 60 to 72ksi UTS). I don't have a first edition at my office, so I can't confirm beyond a shadow of a doubt that this was in effect in 1930.
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RE: 1930 steel beam
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RE: 1930 steel beam
RE: 1930 steel beam
Interestingly, what we would now describe today as a wide flange beam was called a "girder beam" (by Bethlehem, in 1928).
The 1928 catalog notes an allowable bending stress of 18 KSI "when loads are quiescent or nearly so" and 12 KSI for moving loads - even lower for impact loads (no number given). Allowable web shear is stated as 12 KSI.
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