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(1) EN 1993-1-9 gives methods for the assessment of fatigue resistance of members, connections and joints subjected to fatigue loading.
(2) These methods are derived from fatigue tests with large scale specimens, that include effects of
geometrical and structural imperfections from material production and execution (e.g. the effects of tolerances and residual stresses from welding).
(3) The rules are applicable to structures where execution conforms with EN 1090.
(4) The assessment methods given in this part are applicable to all grades of structural steels, stainless steels and unprotected weathering steels except where noted otherwise in the detail category tables. This part only applies to materials which conform to the toughness requirements of EN 1993-1-10.
(5) Fatigue assessment methods other than the ΔσR-N methods as the notch strain method or fracture mechanics methods are not covered by this part.
(6) Post fabrication treatments to improve the fatigue strength other than stress relief are not covered in this part.
(7) The fatigue strengths given in this part apply to structures operating under normal atmospheric
conditions and with sufficient corrosion protection and regular maintenance. The effect of seawater corrosion is not covered. Microstructural damage from high temperature (> 150 °C) is not covered.

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