5. Fatigue actions

5.1 Origins and standards

• Fatigue actions, resulting from stress fluctuations, can come from the following sources:

  • superimposed moving loads, including machine vibrations in fixed structures ;

  • loads due to exposure conditions, such as wind, swell, etc. ;

  • acceleration forces in moving structures ;

  • dynamic response due to resonance effects.

• Fatigue loads are generally defined in the various parts of Eurocode 1 :

  • NF EN 1991-1-4 for wind ;

  • NF EN 1991-2 for bridges ;

  • ...