Fatigue Strength of Field-welded Joints of U-shaped Trough Rib for Bridge Deck(Welding Mechanics, Strength & Design)

概要

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Thin-walled closed section is very useful for steel bridges deck to do warping rigidity and load distribution. However, there are a kind of thin-walled closed section that is U-shaped trough rib to be easy of misalignment for its field-welded joint. This paper describes experiments relating to the fatigue lives of field welded U-shaped trough rib to deck plate joints in bridge deck, under transverse bending and tensile fatigue strength. The investigation involved fatigue test on full scale specimen and tensile fatigue specimen that were subjected to constant amplitude loading. The main finding is investigation of crack initiation and propagation of trough rib with backing strip under the action of a partial moment by misalignment. The analysis of full scale model and tensile fatigue specimen model were used by Finite-element method. Both the experiment and the analysis of FEM, the stress concentrated weld root of inside corner of U-shaped trough rib.
大阪大学の論文