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RE: Non-SJI STD. Steel Joist

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Roger,
I just noticed:
> 20DH9 (below)
should be 26DH9.
Thanks, again.

Ed

> These appear to be Armco Deep High Strength Shortspan joists.
>
> 20DH8  Capacity 280#/ft based on strength (38' span)
>        Capacity 145#/ft based on deflection L/360
>
> 20DH9  Capacity 372#/ft based on strength (36' span)
>        Capacity 197#/ft based on deflection L/360
>
> I can fax you the pages from Armco's booklet if you would like.
>
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
>
> Ed Fasula wrote:
>
> >>I'm looking at a '72 built school for re-roof, they intend
> to remove the
> existing built-up roofing system and replace it with a new ballasted
> membrane roofing system.
>
> In order to check the capacity of the steel joists, I looked into the
> 50-Year Steel Joist Digest by the SJI.  Unfortunately, the
> joists shown on
> the original building plans are not listed.  First of all,
> can anything be
> learned from these non-standard spec numbers - second if so,
> what or how??
> Obviously, the alternative is to analyze the joists, but the
> ceiling finish
> would have to go.
>
> Here are the numbers listed (they are shown clearly on the plans):
> 20DH8 (6'-6" o.c. & span 37'-8")
> 26DH9 (6'-6" o.c. & span 35'-8")
>
>
> Regards,
> Ed<<
>