Parametric FE Analysis for Fatigue Behavior of Rib-to-Deck Welded Joints in Orthotropic Steel Decks

摘要

In the decades, orthotropic steel bridge decks were experienced a variety of fatigue problems fromrnwheel load cycles and welding quality of welded joints. The crack initiation at the weld rootrnbetween deck plates and U-rib was considered as one of the most serious cracks. In this study,rnfatigue tests and finite element analysis were conducted. In fatigue test results, the failure at thernweld root shown to be easier than weld toe. Increase the penetration rate is better for reduction ofrnstress range and stress concentration at weld root. In addition, the specimen with a changedrnthickness from 12mm to 16mm led to the decrease of stress range. A thicker deck plate would own arnlonger fatigue life before crack initiation, which was agrees with the results of tests.