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# Re: Channel

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Channel
• From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
• Date: Mon, 23 Oct 2000 13:05:30 -0400

```Michael,

A 12M11.8 does appear in my AISC manual, but it is *not* a channel.  It is a
flanged H-style section and is Junior Beam (12JR11.8).  Flange width is
3.063".

S = 12.0 in^3
I = 72.2 in^4
A = 3.45 in^2
r = 0.53 in

Allowable bending stress = 20,000 psi
Allowable shear stress = 13,000 psi
If l*d/(b*t) > 600, allowable bending stress = 12,000,000/[l*d/(b*t)]

where l = unsupported length of compression flange
d = depth of section
b = width of compression flange
t = thickness of compression flange

Hope this helps.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Michael Zaitz wrote:

>>Roger,

I think it is a M12 x 11.8 or at least the 1949 equivalent.  This is a
different member from the channel I asked about earlier (12L&J11.8).  I am
using the properties for a M12 x 11.8 and using a yield stress of 33 ksi for a
quick check.  I wanted to make sure that they are sim.  or if there has been a
major change in the member properties since then.

Thanks,

Mike<<

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