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Re: Historical Yield Stress

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My AISC 6th Edition ($7.00), which I apparently obtained in 1963 had W18x60 listed.   About that time I think that A7 steel was being phased out and A36 was coming into the projects that I was working with.

My 5th Edition calls out the steel as W18x7.5, so is apparently when the designations changed.  This manual cost me $3.50 and was purchased from Levinsons in Sacramento.

The 6th Edition has values for steels from 36 ksi through 50 ksi with the allowable unit stresses.

Neil Moore, SE, SECB
neil moore and associates
shingle springs, california

On 2/25/2010 3:43 PM, David Topete wrote:
Assuming 36 ksi isn't that bad of a guess.  I believe AISC have some info about historical steel data.  If you are too confident with these assumptions, then you can have a materials testing firm so some steel coupon tests to determine composition and/or yield and tensile values.
Good luck.

On Thu, Feb 25, 2010 at 3:07 PM, Richard Calvert <RichardC(--nospam--at)> wrote:

I’m working on a build out of an older structure.  There is no information, plans, permits, etc on the original construction, or any of the retrofit work contained in the building…….


I’ve pegged some of the member sizes to ASD Ed. 7 as the last printing that contained their sizes, and one of the members had a W18x60 shop mark, which excludes the possibility of previous editions – as the appropriate designation would have been WF18x7.5 for ASD6

This puts the construction between 1970 and 1980 (maybe 1985 considering many engineers don’t readily update their steel manuals)


With that, I am curious if there were common grades used other/lower than 36ksi for wide flange beams during this period?  And am I correct that the use of 50ksi steel was rare during this period (is 36ksi a safe/conservative assumption)?


Thank you,


Richard Calvert, EIT 

Project Engineer


Lindemann Bentzon Bojack

Architects & Engineers

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