Problem 1. The column cross section shown in Fig. 1 is cast with f: =4,000 psi and reinforced with steel off, = 60,000 p

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Problem 1 The Column Cross Section Shown In Fig 1 Is Cast With F 4 000 Psi And Reinforced With Steel Off 60 000 P 1 (65.93 KiB) Viewed 19 times

Problem 1 The Column Cross Section Shown In Fig 1 Is Cast With F 4 000 Psi And Reinforced With Steel Off 60 000 P 2 (24.67 KiB) Viewed 19 times

Problem 1. The column cross section shown in Fig. 1 is cast with f: =4,000 psi and reinforced with steel off, = 60,000 psi. The total amount of reinforcement, Au = 11.32 in', comprised of 2 No. 11 + 2 No. 10 at each end of the section. The reinforcement ratio, A./A, = 0.03 or =0.03. h = 20 yn = 15" A = 4 No. 11+ 4 No. 10 b = 18" оос No. 4 tie Bending axis E-6-50-0.75 40 7h 0.1 - 60 3.5 0.08 -0.75 -02 -0.00 30 0.03 olh03 25 -0.02 e-04 Pg-0.01 20 05 0.7 15 0.51 10 Como Cont Limit Tons. Cont Limit 0.5 0 0.2 0.4 0.6 12 14 16 0.6 M Fig. A Nondimensional interaction diagram for recaptarted colome with horsies of 000 indy-0.75 . For clearer version of the Interaction diagram, refer to Fig. A-6b in Wight's Reinforced Concrete, Pg. 1095 Fig. 1 - Problem 1.
Problem 1 (cont'd). Determine the following for the column cross section: (a) (10 points) What is nearly the maximum tie spacing (in.) allowed for No. 4 ties, per AC1318. Shear does not govern. (b) (10 points) Determine the maximum allowed service moments for dead and live (i.e., Mo and Mc) of the column, if the following axial forces are present: Po = 152 k P = 228 k Mo = ??k-ft M = ?? k-ft Note that the live-to-dead load ratio of 1.5 is to be maintained (e.g., P://po = 1.5)