Afooting for an existing building column is 6 ft square ( ) and 3 ft below the surface. A proposed building alteration would require this footing to carry a loading of 400 kips. Is the footing of adequate size? Soil investigation indicates that the foundation soils are cohesionless, have an angle of internal friction of 35°, and a unit weight of 120 pcf. The soil rigidity index value is 150. The soil above the base of the footing is well compacted, and the foundation depth factors can be applied. Use a factor of safety of 3 with the extended general bearing capacity equation.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Afooting for an existing building column is 6 ft square ( ) and 3 ft below the surface. A proposed building alteration would require this footing to carry a loading of 400 kips. Is the footing of adequate size? Soil investigation indicates that the foundation soils are cohesionless, have an angle of internal friction of 35°, and a unit weight of 120 pcf. The soil rigidity index value is 150. The soil above the base of the footing is well compacted, and the foundation depth factors can be applied. Use a factor of safety of 3 with the extended general bearing capacity equation.

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