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Re: Reinforcing for a Metal Building Slab...(Harold)

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Does anyone know if "Metal Building Systems" is still in print?

Dave Adams wrote:

> Harold,
>
> Thanks for the reply. I have a copy of the guideline you mentioned in
> addition to "Metal Building Systems" that Gary mentioned and have been using
> "first principles" as discussed which, as you say, makes the most sense and
> avoids the "code moguls". I suppose my question was intended to see if
> anyone (for whatever reason) was applying Section 1907.12 to a slab-on-grade
> in Seismic Zones 3 & 4 and using a minimum amount of reinforcing specified
> from there, even though analysis of all points may show that reinforcing
> below the minimums in that section would suffice.
>
> I agree with your summary. Again, I was curious to see if anyone felt that
> Section 1907.12 applies (I don't believe it does, as you've also stated).
>
> Regards,
> Dave
>
> -----Original Message-----
> From: Sprague, Harold O. [mailto:SpragueHO(--nospam--at)bv.com]
> Sent: Tuesday, October 03, 2000 9:06 AM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: Reinforcing for a Metal Building System Slab-on-Grade
>
> Dave,
>
> There was a guideline that was developed for Butler Manufacturing called
> "Foundation Design and Construction Manual".  It was developed by the people
> at Computerized Structural Design, Inc. They developed a methodology that
> given a thrust magnitude calculates the length of hairpin required for a
> given mesh.  You have to transfer the forces from the hairpins into the
> mesh.  The mesh then either uses the slab in friction to resist the thrust
> or ties the 3 hinged arch together.
>
> The UBC 1907.12 values are for slab shrinkage only, and have nothing to do
> with the applied lateral thrust.
>
> There is no real code guidance here.  You will just have to use first
> principles.  You will have to develop the reinforcing required based on
> acceptable performance (crack acceptability), and calculate the flexural
> reinforcing, the temperature / shrinkage reinforcing, and the reinforcing
> required to develop the thrust in the hairpins.
>
> Engineering unencumbered by the whims of code moguls.
>
> Regards,
> Harold Sprague
>
>         -----Original Message-----
>         From:   Dave Adams [SMTP:davea(--nospam--at)laneengineers.com]
>         Sent:   Friday, September 29, 2000 5:55 PM
>         To:     seaint(--nospam--at)seaint.org
>         Subject:        Reinforcing for a Metal Building System
> Slab-on-Grade
>
>         Hello all,
>
>         I apologize if this is a discussion that has been brought up before.
>
>         What minimum amount of reinforcing meets Code requirements when
> hairpins are
>         present in a slab-on-grade with, perhaps, fork lift traffic but no
> heavy
>         storage rack leg loads? It seems that it would be appropriate to at
> least
>         provide enough steel required to transfer the hairpin forces and tie
>         everything together (possible unequal distribution of support for
> forklift
>         loads, etc.), but is there a need to consider the minimums per
> Section
>         1907.12 as applicable?
>
>         This may be one of those "bonehead" questions, but I'd like to know
> what the
>         consensus is (if there is one).
>
>         TIA,
>         Dave K. Adams, S.E.
>         Lane Engineers, Inc.
>
>