A lot of fatigue cracks have been reported in orthotropic steel deck (OSD). Most of them are developed at the intersection between longitudinal ribs and transverse ribs. Large-sized trough ribs were used in the cases of aiming to increase the economic efficiency of fabrication. In the previous study, fatigue cracks were detected at the welded joints between deck and large-sized trough ribs. The purpose of this study is to propose the new OSD structure connecting large-sized trough ribs to deck through finite element analyses and to confirm its fatigue durability through fatigue tests. As a result, no fatigue cracks were detected in the finally proposed OSD structure.
