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Re: Channel

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Roger Turk wrote:

> Michael,
> The 5th Edition of the AISC Manual was copyright in 1947 and the printing
> that I have is the 20th printing, 1956.  The AISC Specs in it are the AISC
> Specs of 1947, Revised, 1949.  Steel is A7, which typically had a specified
> minimum yield of 33ksi.
> I would not be too worried about a weight difference of 1/10 #/ft in the
> weight designation of the channel, but probably the flange widths should be
> verified as the 12JR C 10.6 was rolled only by the Jones & Laughlin steel
> company and another channel may have been substituted for it.
> Hope this helps.
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
> Michael Zaitz wrote:
> >>Hello
> I have a project built in 1949. The plans show a 12C10.7.  Is this the
> modern day equiv. of the MC12 x 10.6?  The plans I have do not mention
> it being a Junior channel.  The oldest Steel book we have in the office
> is 1963 and it is the 6th edition so I am guessing that this building
> was built using the 4th edition.  Also, what is the best estimate for
> the allowable yield stress of the member?<<