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Historic steel designation 24BL55

Historic steel designation 24BL55

Historic steel designation 24BL55

(OP)
I have drawings of a building from 1968 that show a girder with designation 24BL55.  It is a wide flange beam.  The other beams on the project have designations such as 16WF40 which I can find.  AISC design guide 15 doesn't show this designation either that I can find.  Does anyone have any insight as to where I can find information on this shape?

RE: Historic steel designation 24BL55

CISC handbook has a W24 x 55.  Flange width is 178 mm (7").  Depth is 599 mm (23.6").  If your beam matches those dimensions, you are probably pretty close in using those properties.

BA

RE: Historic steel designation 24BL55

Same as W24 x 55.  One of the lighter sections introduced at that time by Bethlehem Steel, thus the BL.  When it appeared in the AISC manual, it had the same designation as other shapes.

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