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<p>Orthotropic bridges are mostly used in long-span cable-stayed bridges. To deeply understand the factors that influence fatigue cracking in the welds of orthotropic steel decks (OSDs), a multi-scale finite element model was established using ABAQUS–FRANC3D. The effects of the crack position, crack shape ratio, crack depth, and crack angle on stress intensity factors (SIFs) in different directions were studied. The results show that the SIF value of the rib plate welded joint in the OSD decreases as the shape ratio a/c of the crack depth direction (c) to the crack width direction (a) decreases, and it gradually decreases from both ends towards the center in that direction. The depth at which the maximum value occurs in the central direction decreases as the shape ratio decreases. An increase in crack width (a) results in an elevation of SIF values on both ends as one moves toward the center. When a crack propagates, cracks of different initial shapes will gradually approach a stable value, approximately c/a = 0.45. During the crack propagation process, it gradually tends to a specific shape ratio, which is of great significance for predicting and evaluating the propagation of fatigue cracks.</p>

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Analysis of crack geometry effects on fatigue crack propagation in orthotropic steel bridge decks based on fracture mechanics

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Dongmei Tan,
  • Hao Luo,
  • An Li,
  • Baifeng Ji,
  • Yu Tao

摘要

Orthotropic bridges are mostly used in long-span cable-stayed bridges. To deeply understand the factors that influence fatigue cracking in the welds of orthotropic steel decks (OSDs), a multi-scale finite element model was established using ABAQUS–FRANC3D. The effects of the crack position, crack shape ratio, crack depth, and crack angle on stress intensity factors (SIFs) in different directions were studied. The results show that the SIF value of the rib plate welded joint in the OSD decreases as the shape ratio a/c of the crack depth direction (c) to the crack width direction (a) decreases, and it gradually decreases from both ends towards the center in that direction. The depth at which the maximum value occurs in the central direction decreases as the shape ratio decreases. An increase in crack width (a) results in an elevation of SIF values on both ends as one moves toward the center. When a crack propagates, cracks of different initial shapes will gradually approach a stable value, approximately c/a = 0.45. During the crack propagation process, it gradually tends to a specific shape ratio, which is of great significance for predicting and evaluating the propagation of fatigue cracks.