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Foundation Bearing Capacity

The vertical bearing capacity of the foundation soil is verified according to the theory of limit states using the following inequality:

or based on the factor of safety as:

where:

σ

-

extreme design contact stress at the footing bottom

Rd

-

design bearing capacity of foundation soil

γRV

-

coefficient of vertical bearing capacity of foundation (for input use the "Spread Footing" tab)

SFv

-

safety factor for vertical bearing capacity

Extreme design contact stress at the footing bottom is assumed the form:

where:

V

-

extreme design vertical force

Aef

-

effective area of foundation

The vertical bearing capacity of the foundation soil Rd is determined for three basic types of foundation conditions:

  • Drained subsoil
  • Undrained subsoil
  • Bedrock

The above computations are applicable only for the homogeneous soil. If there is a non-homogeneous soil under the footing bottom (or there is ground water present), then the inserted profile is transformed into a homogeneous one.