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Re: Sanitary Structures

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A couple of things to consider relative to checking "z" for sanitary 
structures: 
 
1. ACI 350 requires checking "z" for one-way slabs and beams but not for 
two-way flexural members.  Thus you don't always have to check "z", such as 
for designs using PCA's two-way plate tables. 
 
2. If you consider fs=0.60Fy, with grade 60 bars and 2-inches of cover, for 
typical bars a 6-inch bar spacing will meet "normal sanitary exposure"
(z=115) 
and a 12-inch spacing will meet non-sanitary exterior exposure (z=145).   
 
Thus you can limit your "z" checking at walls and slabs to "severe sanitary 
exposures" if you use the above spacings.