新設および大規模改修時における橋梁計画(1)

[CS3-02] Structural evaluation of new and existing orthotropic steel decks by FEM analysis

〇Atsushi Tanabe¹, Katsuo Numa², Masahiro Sakano³ (1.Nikken Sekkei Civil Engineering, 2.Ministry of Land, Infrastructure, Transport and Tourism, Kinki Regional Development Bureau, 3.Kansai University)

Keywords:Orthotropic steel decks, Top of vertical stiffeners, Half circle cut method, Fillet shape, FEM analysis

Many fatigue cracks were found at the top weld of vertical stiffeners in orthotropic steel decks. Few countermeasures were already proposed. However, these methods may reduce vertical stiffness of the stiffeners. This study carried out FEM analyses of vertical stiffeners with modified half circle cut method and with fillet shaping method based on fatigue retrofitting method of beam-to-column connections of frame steel piers. As a result, fillet type with R=30mm was most efficient shape for fatigue strength improvement.