A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also 3 feet) spread footing. The normally consolidated clay has the following engineering properties: γdry = 115.0 pcf φ’=24° c’= 90.0 psf Cc/(1+e0) = 0.15 The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground surface. a) Using the classical piece-wise log-linear method, estimate the total settlement of this footing considering only the allowable bearing pressures using ASD approach. The unit weight of concrete is 150 pcf. State any assumptions made. b) What is the maximum bending moment from the earthquake that this foundation can support? Consider bending moment only about one axis. c) In the case of your estimated maximum bending moment, what would be the total settlement?
A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also
3 feet) spread footing. The normally consolidated clay has the following engineering properties:
γdry = 115.0 pcf
φ’=24°
c’= 90.0 psf
Cc/(1+e0) = 0.15
The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground
surface.
a) Using the classical piece-wise log-linear method, estimate the total settlement of this
footing considering only the allowable bearing pressures using ASD approach. The unit
weight of concrete is 150 pcf. State any assumptions made.
b) What is the maximum bending moment from the earthquake that this foundation can
support? Consider bending moment only about one axis.
c) In the case of your estimated maximum bending moment, what would be the total
settlement?
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