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Yes, better help find some books or examples.IDC said:I'm not familiar with ACI 224R, but a common model for calculation of crack widths assumes that between cracks the tensile strain in the bar is transferred to a block of concrete extending from the tension face to a depth twice the distance from the centroid of the tension reinforcement to the tensile face, i.e. "an area of concrete symmetric with the reinforcing steel". A is the area of this block assigned to each bar.