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Assalam o alaikum, How much important width of column strip is in SAFE? One of my friend told me that his boss (Owner of Arif Associates Lahore) told him that width of column strip assigned in SAFE, should be minimum 1.5h+c (where h= thickness of footing/slab and c=dimention of column parallel to width of strip) and told him that it is critical width. I searched about it and in ACI detailing manual 2004, in article 2.10.10, i found " Two-way slabs without beams-Moderate seismic risk -Reinforcing steel for the fraction of Mu to be trans- ferred by moment (Eq. (13-1), AC1 318 [318M]), but not less than half the total reinforcement required for the column strip, shall be placed in the width of slab between lines 1.5 times slab or drop panel thickness on opposite faces of the column. (This width equals 3h + c2 for edge and interior col- umns or 1.5h + c2 for corner columns.) The AE shall show the reinforcing steel to be concentrated in this critical width. See Fig. 19(d) in Part C for typical detail used for locating other bars in nonseismic areas." I am confused what is link between this critical width and width of design strip in safe? What if i assign 1 ft design column strip and provide the reinforcement upto this said critical width? will it be wrong? Thanks.