A measure of strength frequently used in Europe is the Reserve Factor (RF). With the strength and applied loads expressed in the same units, the Reserve Factor can be defined as a funcion of the Proof Strength and the Proof Load as shown.
The applied loads have any factors, including factors of safety applied.Related formulas
|RF||reserve factor (dimensionless)|
|PS||proof strength (dimensionless)|
|PL||proof load (dimensionless)|