ABSTRACT
SUMMARY The fatigue behavior of plate and box girder structures subjected to repeated loading is presented, based on the results of analyses, laboratory tests and observations of model or actual structures carried out by the authors. First of all, fundamental crack patterns occurring in thin-walled plate girder bridges are discussed, including cracking at the connections of cross-beams to the main girders of highway bridges. Secondly, fatigue cracking of two types of box girder monorail guideways is considered. Finally, the fatigue cracking observed in heavy-duty crane girders, such as welded crane girders in workshops and apron girders of unloaders in harbors, is discussed.
