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| Azevedo, Nuno Monteiro |
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Wu, Weijian
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Publications (4/4 displayed)
- 2024Fatigue behaviour of root crack in stiffener-to-deck plate weld at crossbeam of orthotropic bridge deckscitations
- 2023Hybrid fatigue crack propagation analysis using damage and fracture mechanics methods
- 2022Corrosion Fatigue
- 2019Fatigue crack propagation analysis of rib-to-deck welded joint in OSDs using linear elastic fracture mechanics
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article
Fatigue behaviour of root crack in stiffener-to-deck plate weld at crossbeam of orthotropic bridge decks
Abstract
Steel Orthotropic Bridge Decks (OBDs) are widely used in long-span and movable bridges. Fatigue resistance analysis plays an important role in the design or assessment of OBDs. One possible fatigue failure is the crack initiating from the weld root of stiffener-to-deck plate connections at crossbeams. A full-scale experimental investigation in this study using a 20 mm thick deck plate with a dimension of 9.4 m × 5.1 m, including three crossbeams, represents the modern designed OBDs. The experiments show an arrest of crack propagation with a final crack depth of approximately 75% of the deck plate thickness. On the contrary, through thickness cracks develop in deck plates of 10 or 12 mm. Hot spot stress based fatigue detail categories (DC) using various failure criteria derived from the tests. Analysis with the effective notch stress shows that the DC has low sensitivity to the amount of weld penetration. The results of analyses with the eXtended Finite Element Method (XFEM), employed to analyse the fatigue crack propagation path and crack arrest, are in line with the experimental study.