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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 "Bearing cap." frame in the "Verification on uplift" dialog window allows to input the design angle of friction of overburden φd and the design cohesion of overburden cd.

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 footing bottom

p

-

footing perimeter

Gp

-

self weight of foundation

Verification on uplift - standard approach