CE Board PSAD Problem 1 (Footings)

(CE May 2012) A rectangular footing, 0.70 m. thick, 2.4 m. wide along the x-axis, supports concentrically a column 0.4 m. square subjected to the following loads.

Axial load = 1,200 kN
Moment about the y-axis, M_y = 360 kN-m
Height of backfill on top of the footing = 1.5 m
Concrete unit weight , γ_conc = 24 ^kN⁄_m³
Soil unit weight , γ_soil = 17 ^kN⁄_m³

a. Calculate the max. net soil pressure

.q_max = 256 kPa

b. Calculate the min. net soil pressure

.q_min = 64 kPa

c. Calculate the gross safe soil bearing capacity

.q_all = 298.3 kPa