Old steel beam classification?
Old steel beam classification?
(OP)
Hi there,
I am trying to determine the section properties and yield strength of an old beam shown in some 1962 drawings.
It was a UK company that did the drawings, which is leading me to believe that it is actually a UK universal beam.
It states 10"x5-3/4" UB x 21# Cross beam (H.Y.S)
The closest UK beam I could find that has similar dimensions is the 254x146x31 universal beam.
I am guessing that HYS stands for high yield steel? If so what kind of yield strength would that have been in the 1960s for a bridge application?
See attached image.
I am trying to determine the section properties and yield strength of an old beam shown in some 1962 drawings.
It was a UK company that did the drawings, which is leading me to believe that it is actually a UK universal beam.
It states 10"x5-3/4" UB x 21# Cross beam (H.Y.S)
The closest UK beam I could find that has similar dimensions is the 254x146x31 universal beam.
I am guessing that HYS stands for high yield steel? If so what kind of yield strength would that have been in the 1960s for a bridge application?
See attached image.






RE: Old steel beam classification?
You can probably find a copy via Google.
RE: Old steel beam classification?
RE: Old steel beam classification?
Look at AISC DG#15 for mechanical properties by year: Part extract:
RE: Old steel beam classification?
I am surprised that the yield strength is so low for the A7-61T and A36-62T. I would've expected H.Y.S. steel to be at least 300 MPa.
RE: Old steel beam classification?
10WF21, 10B21 or B10x21.
Dik
RE: Old steel beam classification?
Yea I can confirm that the physical dimensions are :
10x5.75x21
depth = 9.9 “ = 251.46mm
breadth = 5.75” = 146 mm
web thickness = 0.24” = 6.1mm
flange thickness = 0.34” = 8.6mm
area = 6.2 inch2 = 4000 mm2
second moment = 106.3 inch4 = 44120531.2 mm4
section mod = 21.5 inch3= 352321.9 mm3
RE: Old steel beam classification?
Dik
RE: Old steel beam classification?
From the Manual of Bridge Evaluation (which governs evaluation of existing structures), you'd want to assume A7 (33ksi) steel given a lack of any other information.
In the 30s and 40s, some designers used "Silicon Steel" or other alloys which had higher yield strengths -- but these were out of favor by the 60s due to lack of weldability and ductility among other concerns.
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The name is a long story -- just call me Lo.