Static cone penetrometer resistance data obtained from a building site underlain by sand show an average qcvalue of 100 kg/cm2. From this information, estimate the size of square footing necessary to support a column load of 250 kips. Assume that the footing will be placed approximately 4 ft deep and that a 1 in. settlement is tolerable. (Refer to and 12; assume DRis 60 pct.)
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