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

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Yes. I'm interested.

Please e-mail the articles to: djkiss55(--nospam--at)juno.com
I'd also appreciate Rick Smith's phone #

Thank you in advance.

Desi J. Kiss, P.E.





On Thu, 29 Nov 2001 07:54:25 -0500 "Hyndman, Keith"
<KHyndman(--nospam--at)engineeringsi.com> writes:
> 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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