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Re: z factor for crack control

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Why don't concrete sections using Gr 40 steel need to be checked for crack

Bill Allen

> From: Roger Turk <73527.1356(--nospam--at)CompuServe.COM>
> To: INTERNET:seaoc(--nospam--at)
> 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