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Fatigue Strength of Steel Plate Girders with Notched Dapped End

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This study examines numerically the stress concentrations and the fatigue strength of steel plate girders with notched ends. The geometric discontinuity of the notch gives rise to the stress concentrations in the web plate and makes it vulnerable to the formation of fatigue cracks under cyclic loading. The finite element analysis and the hot spot stress method have been employed. The implemented approach has been verified against experimental results in literature. The effects of using notched end have been studied considering the girder strength, the failure mode, the deflection and the cross section distortion. Two areas of stress concentrations and three hot spots have been detected. The dimensions of the notch details have been found to have significant effects on the magnitude of stress concentrations and fatigue strength. For future works, the obtained conclusions provide guidance for the design of notched ends details in steel plate girders against fatigue and they can be considered as a basis for design standards. For already existing girders, a strengthening method has been proposed against fatigue. This study applies as far as no out of plane deformation and/or buckling occurred in the web plate.
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Fatigue Life; Hot Spot Stress; Notched Dapped End; Plate Girder; Strengthening

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