Old time steel shape 21 B 49
Old time steel shape 21 B 49
(OP)
I am trying to get information on this steel shape , "21 B 49"
I dont know where to find some info on it? Such as Fy?
Is it unconservative for section capacity just use 21 W 49? What is potential risk?
Anybody can give me moment capacity of the beam for different lateral supports like we have it for 21 W 49 in AISC 9th Edition
Thank you
I dont know where to find some info on it? Such as Fy?
Is it unconservative for section capacity just use 21 W 49? What is potential risk?
Anybody can give me moment capacity of the beam for different lateral supports like we have it for 21 W 49 in AISC 9th Edition
Thank you






RE: Old time steel shape 21 B 49
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
Ix=970.3in^4
Sx=93.2in^3
Depth=20.82"
bf=6.52"
tf=0.532"
tw=0.368"
I'd recommend going to amazon and buying a copy of the 6th edition manual. Likely cheap.
RE: Old time steel shape 21 B 49
Thank you very much for the sectional properties.
Why guessing 36 ksi ? Isn't Fy stated in that code?
SlideRuleEra (Structural),
DWGs are dated 72
boo1 (Mechanical),
Thank you for trying to help. What information I would find there?
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
It's generally treated as a conservative steel to assume if the grade is unknown, but I've seen steel from the 20s and 30s that wouldn't have met A36 (either made to A7 or the designer wrote his own spec).
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
A36 is probably the steel specification which was used in 1972.
BA
RE: Old time steel shape 21 B 49
Mike McCann, PE, SE (WA)
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
Nor in my 1956 AISC Design Manual. All the sections listed there are WF sections
It is interesting to note on page 202 of that same manual that 20,000 psi is the limiting stress here for the beam span tables, implying 33 ksi steel (.6 X 33 = 19.8).
My 1967 copyrighted edition of the 6th edition shows no such beam either (first copyright 1963). 21 WF sections start at 55#/ft and there are no B sections shown above 16" deep.
The beam span tables in the 1967 copyright of the 6th edition were designed for A36 steel.
I am wondering if this was a non-standard beam not shown in the tables. If so, testing would really be required for the Fy unless you assume 33 ksi to be conservative, depending on the year of construction.
Mike McCann, PE, SE (WA)
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
Mike McCann, PE, SE (WA)
RE: Old time steel shape 21 B 49
RE: Old time steel shape 21 B 49
At the bottom of the page is the note:
* Not available from Canadian mills
BA