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Re: Control joints in Elevated slabs (Re: Harold)

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Keith,

	Please post them on the server.  I'm sure we would all like to see
them.

				Best regards,

				H. Daryl Richardson

Hyndman, Keith wrote:
> 
> Thanks all for your responses, I spoke with Rick Smith of Structural
> Services Inc. of Dallas, Texas how works for Eldon Tipping (ACI Committees
> Member).  He was very helpful on this issue and also emailed me 2 articles
> (pdf format) on the subject.  If any are interested let me know, I'll
> forward them.
> 
> In any case, there are some cases where control joints are used in elevated
> slabs, I learned something there.
> 
> Harold, could you direct me to resource or formulas for calculating the
> shrinkage crack widths?
> 
> Keith
> 
> -----Original Message-----
> From: Sprague, Harold O. [mailto:SpragueHO(--nospam--at)bv.com]
> Sent: Wednesday, November 28, 2001 7:44 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: Control joints in Elevated slabs
> 
> Hyndman,
> 
> No.  But cracking in concrete slabs on metal deck is an issue.
> 
> Number one, never use polypropylene fibers.  Use mesh or rebar.  This is
> another topic.
> 
> If the slab is covered by carpet, use the minimum SDI recommended steel and
> forget about it.
> 
> If the slab is going to be exposed or covered with a material that could
> reflect cracks, CONTROL the cracks and consider the following.
> *       Add TOP rebars about 5' long perpendicular to beams and girders.
> This is not required for strength.  It is just to CONTROL the cracks that
> WILL form due to negative bending along the center line of steel girders,
> beams, and joists.  The only exception is if the joists or beams are spaced
> at about 6 ft. or less or if you drape the mesh.  You will still need the
> rebars at the girders.  The crack widths can be calculated, and when they
> reach the point of ugly (architectural term), add rebar.
> *       Use the ACI minimum reinforcing steel (as opposed to SDI).
> 
> It is important to note that the tables that we all use for composite steel
> deck design were derived with no consideration for negative bending at the
> supports, and the SDI recommended WWF for crack control was developed
> empirically (SWAG method).  You will not find this information published.  I
> just called the guy who developed the tables one day.
> 
> Regards,
> Harold O. Sprague
> 
> > >From: "Hyndman, Keith" <KHyndman(--nospam--at)engineeringsi.com>
> > >Reply-To: seaint(--nospam--at)seaint.org
> > >To: "Seaint@Seaint. Org (E-mail)" <seaint(--nospam--at)seaint.org>
> > >Subject: Control joints in Elevated slabs
> > >Date: Wed, 28 Nov 2001 14:04:01 -0500
> > >
> > >Anyone ever heard of putting control joints in elevated concrete slabs on
> > >deck?
> > >
> > >Keith Hyndman, P.E.
> > >khyndman(--nospam--at)engineeringsi.com
> > >Engineering Solutions Inc.
> > >436 Creamery Way, Suite 100
> > >Exton, PA 19341
> > >Phone: 610-524-1357
> > >Fax: 610-524-1317
> > >
> 
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