An interior column foi a tall concrete strocrure carries total service loads D =

ID: 1828081 • Letter: A

Question

500 kips and L = 514 kips. The column is 22 X 22 in. in cross section and is

reinforced with twelve No. 11 (No. 36) bar; centered 3 in. from the column

faces (equal number of bars each face). For the column, f'c = 4000 psi and

fy = 60,000 psi. The column will be supported on a square footing, with the

bottom of the footing 6 ft below grade. Design the footing, determining all

concrete dimensions and amount and placement of all reinforcement, including length and placement of dowel steel. No shear reinforcement is permiued

Material strengths for the footing are f'c = 3000 psi and fy = 60,000 psi.

Load = 1.5*(D+L) = 1521 kips ;

Area = 1521*10^3/3000 = 507

side ^2 = 507

side = 22.5166 inches ;

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