Reserve factor as function of the ultimate strength and load


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 Ultimate Strength and the Ultimate Load as shown.

The applied loads have any factors, including factors of safety applied.

Related formulas


RFreserve factor (dimensionless)
USultimate strength (dimensionless)
ULultimate load (dimensionless)