multi-story steel frame structure will be constructed on stiff clay. The clay is uniform and saturated with a water content of 30%, specific gravity of solids 2.7, and average unconfined compressive strength of 250 kPa. in the upper 6 m. Effective cohesion andeffective friction angle have been determined from a triaxial test to be equal to 25 kPa and 20° respectively. The columns will be supported by square footings founded 1m below the groundsurface. The design (allowable) column load is 450 kN. Ground water table is deeper than 2 m.
A multi-story steel frame structure will be constructed on stiff clay.
The clay is uniform and saturated with a water content of 30%, specific gravity of solids 2.7, and average unconfined compressive strength of 250 kPa. in the upper 6 m. Effective cohesion andeffective friction angle have been determined from a triaxial test to be equal to 25 kPa and 20°
respectively. The columns will be supported by square footings founded 1m below the groundsurface. The design (allowable) column load is 450 kN. Ground water table is deeper than 2 m.
Determine the width of the square footing for the factor of safety of 3 against bearingcapacity failure in the short term by using Terzaghi’s equation.
Based on the width that you determined based on the short term analysis check the factorof safety against the bearing capacity failure in the long term. If factor of safety of 3 isrequired in the long term as well what needs to be changed to satisfy this requirement?
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