Design a square column footing for a 18-in square tied interior column that supports a dead load D= 220 k and a live load L=180 k. The column isreinforced with eight bars, the base of the footing is 4 ft below grade, the soil weight is 110 lb/ft3, qa= 5500 psf, f'c= 4000 psi and fy= 60,000 psi.