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Re: Historical Yield Stress

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Richard,
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)lbbe.com> 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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