Analysis According to the Safety Factor (ASD)
The verification methodology of structure safety based on the "Safety factor" is historically the oldest and most widely used approach. The principal advantage is its simplicity and lucidity.
In general, safety is proved using the safety factor:
where: | FS | - | Computed safety factor |
Xpas | - | A variable resisting the failure (resisting force, strength, capacity) | |
Xact | - | A variable causing the failure (sliding force, stress) | |
FSreq | - | A Required factor of safety |
When performing the analysis using the "Safety factor", neither the load nor the soil parameters are reduced by any of the design coefficients.
A more detailed description for individual programs and types of structures can be found in the following chapters (Walls and retaining structures, Slope Stability, Spread Footing, Pile, Rock Stability, Micropile, Pile CPT, Pile Group).