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Re: z factor for crack control

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Bill Allen, S.E. wrote:
> 
> Why don't concrete sections using Gr 40 steel need to be checked for crack
> control?
> 
> Regards,
> Bill Allen
> 
> ----------
> > From: Roger Turk <73527.1356(--nospam--at)CompuServe.COM>
> > To: INTERNET:seaoc(--nospam--at)seaoc.org
> > Subject: Re: z factor for crack control
> > Date: Sunday, August 10, 1997 12:18 PM
> >
> > I, too, have been frustrated with the z-factor for crack control,
> > particularly with footings where you have 3" clearance.
> >
> > The criteria that I now use is to design these conditions based
> > on using grade 40 steel, even if I am using grade 60 steel.
> > However, I will use the limits for maximum steel based on grade
> > 60.  My reasoning is that if grade 40 steel does not need to be
> > checked for the z-factor, then there is no reason to space steel
> > closer together than that required for grade 40.
> >
> > A. Roger Turk, P.E.(Structural)
> > Tucson, Arizona
> >
> >
> >
> 
I just recently read something about that in the ACI 95 workbook.

James Dancer, EIT
Port of Houston Authority