LRFD 2012 - Analysis of Spread Foundations
introduces two types of design coefficients - coefficients modifying the load magnitude (Load factors) and coefficients reducing the soil resistance (Resistance factors).
These coefficients enter the analysis according to the selected.
Partial factors for load are used to multiply the self weight of spread foundation and the weight of soil above foundation (overburden) only. Individual components of load must be multiplied by corresponding partial factors - the input load is not adjusted by the program in any way.
When performing the final verification, the overall resistance of the structure against failure is multiplied by the corresponding resistance factor.
Analysis based on LRFD 2012 - input of partial factors for foundations