The long term fatigue behaviour of plate girders with longitudinal out-of-plane attachments on the bottom flange was investigated. Fatigue cracks were initiated at the attachment-side fillet weld toe and propagated through the fillet weld to break out the bottom flange. Fatigue strength of plate girder flanges with longitudinal out - of - plane attachments was found to be lower than the lowest Category IH of JSSC Fatigue Design Recommendations.
