Fatigue Crack Propagation Characteristics of the Deck to Longitudinal Rib Weld in Orthotropic Steel Bridge Deck

In order to investigate the fatigue crack propagation characteristic of the rib-to-deck joint consider- ing welding residual stress, the finite element model of the orthotropic steel bridge deck was estab- lished for the typical box girder of a cable-stayed bridge. Considering the effect coupled with the residual stress field, the initial crack and the fatigue load, the fatigue crack propagation at the rib- to-deck joint was simulated based upon the extended finite element method (XFEM). The simulation result of the residual stress shows that there is a large residual tensile stress in the welding area of the rib-to-deck detail, and the peak value of the Von-Mises stress at the rib-to-deck joint close to the yield stress of Q345 material. The results of fatigue crack propagation behaviour display that the fatigue crack at the weld toe is led by mode I, which could keep in the plane during the crack prop- agation. And the fatigue crack at the weld root is mix mode I-III crack led by mode I, which cannot keep in the plane during the crack propagation, but slightly deflection.

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