1998 Volume 5 Issue 18 Pages 11-19
Butt welds with a backing strip are widely used in the joints of longitudinal trough ribs of orthotropic bridge decks. Fatigue strength of transverse butt welded trough joints with a tack welded backing strips in steel deck panels was examined by bending fatigue tests and fatigue failure surface observations. Also local stress behaviour was examined by applying finite element method analysis. A total of 26 specimens with 5 different tack weld details were tested. The results of the fatigue tests show that there is almost no difference in the fatigue strength of butt welded trough joints made using the different details. The study indicates that the most influential factor regarding the fatigue strength performance of butt welded joints having a backing strip is the presence of defects in the weld root.