Abstract
Given the field-observed surface cracks and poor surface flatness of the deck to U-rib welds, this study aims to quantify the effect of weld profiles on the fatigue performance of the deck to U-rib welds. Frist, typical geometric characteristics of the weld profile were obtained through statistical sampling. Second, a parametric study on the influence of the typical characteristics was performed, and the local surface mutation was indicated as the main factor contributing to stress concentration from the analysis results. Third, the power spectrum density method was proposed to extract the local surface mutation, which was quantified by the defined mutation value (M), and the relationship between M and the fatigue life was derived utilising FE and theoretical method. Finally, the process for fatigue assessment of the weld surface was proposed. The results show that (1) in the simplified modelling of the welds in OSDs, a combination of the quadratic function and the transition radius can be used to describe the weld profiles; (2) the local geometric mutation, such as surface defects, should be paid much attention to during the field inspection; (3) the derived functional relationship between the mutation value and the fatigue life can be used to evaluate the fatigue performance of welds with different weld profiles. Overall, this study contributes to our understanding of fatigue cracking at the deck to U-rib welds and establishes a quantitative framework for evaluating the fatigue performance of the welds considering the effect of the weld profile.
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The authors appreciate the support of the National Key Research and Development Project (Grant No. 2017YFE0128700).
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This research is supported by the National Key Research and Development Project (Grant No. 2017YFE0128700).
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Jiang, F., Ji, B., Fu, Z. et al. Effect of Weld Profiles on Fatigue Performance of Deck to U-Rib Weld in Orthotropic Steel Deck. Iran J Sci Technol Trans Civ Eng 46, 901–915 (2022). https://doi.org/10.1007/s40996-021-00664-1
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DOI: https://doi.org/10.1007/s40996-021-00664-1