The Design Output for the Mat Foundation Design Module of Foundation Advanced presents a cryptic formula for calculating the steel percentage required. The minimum area of steel required is given as 0.0018 for Grade 60 bar per ACI 318-11, Section 7.12.2.1.b. The maximum area of steel is given by limiting the steel to 0.75 times the balanced reinforcement ratio. What is confusing is the formula given for the steel percentage required. Please provide the basis of the formula, including ACI 318-11 equation/code references.
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