3- Using the appropriate column interaction diagram below, select the longitudinal reinforcing steel bars for the round spirally-reinforced column shown below if f. 4000 psi, f, = 60,000 psi, Pu = 500 k, and My = 225 ft-k. %3D %3D %3D A 314 in.2 2글 in.-→ -24 in. -15 in.- 20 in.-
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