Beurteilung des Ermüdungsverhaltens von Krankonstruktionen bei Einsatz hoch‐ und ultrahochfester Stähle

Analysis of fatigue details typically used in crane structures. For joints and attachments in crane structures usually the verification of the fatigue strength governs the design. When using the nominal stress approach some details often used in crane structures, especially welded details, cannot be classified according to the tables of fatigue classes given in the standards. Together with representatives from the crane industry such details have been identified. In the frame of the FOSTA research project P 512 fatigue tests have been carried out, so that proposals for the classification according to Eurocode 3 could be made. In addition, fatigue tests on structural details already covered by the codes have been executed to check the influence of material strength. A general increase of the fatigue strength when using high strength steel could not be observed but details with low notch effects show a better behaviour compared with normal strength steel. This is attributed to higher fabrication qualities. The research project P 512 was funded by the Stiftung Stahlanwendungsforschung, Essen, and has been carried out in behalf of the Forschungsvereinigung Stahlanwendung e.V.