Multi‐Dimensional Influence Surface‐Based Analysis on Fatigue Strength of Semi‐Open‐Rib to Deck Welded Joints in OBD

ABSTRACT In this study, the fatigue strength of newly developed semi‐open‐rib‐to‐deck welded joints in orthotropic steel bridge decks (OBD) structures is accurately predicted using the traction structural stress method through comparison with full‐scale experimental results. Three commonly adopted welded joints, i.e., semi‐open‐rib‐to‐deck, double‐sided U‐rib‐to‐deck, and open‐rib‐to‐deck welded joints, are systematically compared to identify the best type. The critical fatigue strengths of semi‐open‐rib‐to‐deck and double‐sided U‐rib‐to‐deck welded joints are found to be nearly identical despite exhibiting distinct fatigue failure modes and significantly superior to open‐rib‐to‐deck welded joints. Furthermore, a concept of the multi‐dimensional influence surface is proposed for determining the critical fatigue failure mode subjected to random vehicular loads.