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GEO5

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Standard Approach

The uplift resistance Rt combines the self-weight of the soil overburden and footing + friction along the footing walls + fictitious (substitute) block of soil above the footing.

The soil properties are determined according to overburden type from the "Foundation" frame. If the chosen type is "input shape and soil" or "from geological profile" the angle of internal friction φ and cohesion c are taken from the assigned soils. In case of "input unit weigh" the "Bearing cap." frame in the "Verification on uplift" dialog window allows us to input the angle of internal friction φ and cohesion c of overburden.

Dialog window "Verification on uplift" - standard approach

The vertical bearing capacity check - spread footing in tension (uplift resistance) follows from:

where:

σx

-

earth pressure at rest due to overburden

φd

-

design angle of internal friction of overburden

cd

-

design cohesion of overburden

d

-

depth of the footing bottom

p

-

footing perimeter

Gp

-

self-weight of foundation

Verification on uplift - standard approach

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