Ermüdungsfestigkeit einseitig geschweißter Stumpfstöße von Kreishohlprofilen

Fatigue performance of girth welded butt weld of circular hollow sections.

Within the research project "FIT", the fatigue behavior of welded joints frequently used in supporting structures for offshore wind energy plants as also bridges was investigated. The research work was focused on the fatigue performance of girth welded circular hollow sections (CHS). For girth welded CHS being welded from one side only, the FAT-classification according to different standards and recommendations was compared, and extensive experimental investigations were performed. Based on the results the fatigue strength of girth welded CHS was determined and a recommendation for FAT-classification was given. Additional studies contribute to identify and evaluate effects which are relevant to fatigue such as the influence of misalignment. These influences have been taken into account within the numerical studies and a recommendation for FAT classification is given. The developed recommendation can serve as a basis for future consideration in standards and guidelines.