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Spread Footing
Analysis of bearing capacity of foundation
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 frame "Settings") | |
| FS | - | inputted factor of safety |
Extreme design contact stress at the footing bottom is assumed the form:
| where: | Vde | - | 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.
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