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 given by:
where: | V | - | extreme design vertical force |
Aef | - | effective area of the foundation |
The vertical bearing capacity of the foundation soil Rd is determined for three basic types of foundation conditions:
The above computations are applicable only for the homogeneous soil. If there is a non-homogeneous soil under the footing bottom (or there is groundwater present), then the inserted profile is transformed into a homogeneous one.