But 22.6.4.3 specifies that openings only reduce bo if they are within 4h of the column face. To me that seems to suggest that they only affect the unreinforced critical section. Wouldn't openings beyond 4h have the possibility of reducing the larger, reinforced critical section?
I have a 12" slab supported by 16" columns every 18-26'. The slab is reinforced at each column like in ACI 318-19 Fig. R22.6.4, with lines of stirrups projecting out from each face of the column. There are some 6" pipes that puncture the slab near the columns.
Per R22.6.4.3, these small...