using ACI318-19

9.1. A 16 in. square column is reinforced with four No. 11 (No. 36) bars, one in each corner, with cover distances 3 in. to the steel center in each direction. Material strengths are f' = 5000 psi and f, = 60,000 psi . Construct the interaction diagram relating axial strength Pn and flexural strength Mn. Bending will be about an axis parallel to one face. Calculate the coordinates for Po, Pb, and at least three other representative points on the curve. 9.3. Plot the design strength curve relating Pn and M, for the column of Problem 9.1. Design and detail the tie steel required by the ACI Code. Is the column a good choice to resist a load Pu = 540 kips applied with an eccentricity e = = 4.44 in