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8"-18.4# I.B.-----steel beam, 1950

8"-18.4# I.B.-----steel beam, 1950

8"-18.4# I.B.-----steel beam, 1950

(OP)
Working off of 1950 drawings. A roof steel beam is marked as "8"-18.4# I.B". I don't have a copy of the historical shapes in my office and a look thru AISC website did not produce any productive results.

Would anyone know if this beam is same as W8x18 and what grade steel would it be?

Thanks,

RE: 8"-18.4# I.B.-----steel beam, 1950

Pretty sure you want to look at the S8x18.4 with tapered flanges, etc..

RE: 8"-18.4# I.B.-----steel beam, 1950

(OP)
Teguci,

thanks, that makes sense. Any idea what would have been the grade for S & W shapes in 1950?

RE: 8"-18.4# I.B.-----steel beam, 1950

33 - ASCE 7
4th Edition to AISC - 1945  - Allowable Tension and Bending = 20ksi

RE: 8"-18.4# I.B.-----steel beam, 1950

Paddington-
Your link mentions "A6" being used in early 1900's....is that supposed to be A7?  

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