The LRFD method (Load Resistance Design Factor) introduces two types of design coefficients: load factors and resistance factors.
Is is a method that gives importance to the Ultimate Limit State of the structure and does not take into account the concept of "characteristic" resistance.
The method is based on the inequality:
where Q is the sum of the nominal loads acting on the structure multiplied by the "load factors" ,ϕ is a “resistance factor” and Rn is the nominal resistance.
Tab. 3.4.1-1 LRFD - Load combinations and load factors
Tab. 3.4.1-2 LRFD - Load factors for permanent loads
Tab. 11.5.6-1 LRFD - Resistance factors for retaining works
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