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Designing A Plain Concrete, Spread Footing Foundation To Support A Continuous Wall Using ACI Code

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Design a plain concrete footing to support a wall given the following design parameters:

Width of wall: 16 inches
Wall dead load including self-weight: 15 k/ft
Wall live load: 11 k/ft
Distance from final grade to bottom of footing: 4 ft
Normal weight concrete
Compressive strength of concrete: 3 ksi
Allowable soil pressure: 5 ksf
Unit weight of concrete: 145 lb/ft^3
Unit weight of soil: 100 lb/ft^3

assume a depth for the footing foundation

find the weight of the footing

weight of the soil on top of the footing

calculate the effective soil pressure at the bottom of the footing

compute the required width of the footing per unit length of the wall

determine the factored load, Pu, per ASCE 7 load combinations

calculate the net upward pressure per unit length of the wall

calculate the maximum bending moment, Mu, which occurs at the face of the wall.

check the flexural tensile stress by finding the actual and allowable flexural tensile stress

check shear in the footing by determining the maximum factored shear force at the critical section and the allowable shear force