This study investigated a steel patch plate bonding technique on one side for the temporary repair of through-thickness crack in orthotropic steel deck, OSD, at vertical stiffener end. Out-of-plane gusset specimen was used in this study. Fatigue tests were carried out using bending type of fatigue test machine under the stress ratio R=-infinity. Steel plate or Cabon Strand Sheets were adhered on the back surface of specimen after through-thickness crack was found. Then bending fatigue test was continued until crack propagated 50mm away from the weld toe on gusset attached surface. By bonding patch plate on the back surface of the specimen, the remaining fatigue life was extremely extended if the patch plate working. Furthermore, when the impact crack closure retrofit, ICR, treatment was applied at the crack on gusset surface with pach plate bonding on the back surface, the remaining fatigue life was also extended.
