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RE: ACI  Z cracking
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 Subject: RE: ACI  Z cracking
 From: <William.Sherman(nospamat)CH2M.com>
 Date: Mon, 19 May 2008 12:20:12 0600
Title: Message
I believe that ACI 318 replaced the zfactor in the
1999 code. There is still a requirement related to spacing of bars to
control cracking, but it is less stringent and is based on aesthetics rather
than durability.
The ACI 35001 code retained the zfactor equations to
control cracking for durability. The ACI 35006 code modified the crack
control equations, replacing the zfactor equations. The modified
equations are based on research by "Frosch" rather than the previous
research by "GergelyLutz". The equations in ACI 35006, Section
10.6.4, were reformatted to calculate an allowable steel stress based on bar
size and spacing in lieu of the quantity 'z'.
Bill
Sherman
CH2M HILL /
DEN
7202862792

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