Journal
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
Volume 194, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcsr.2022.107311
Keywords
Steel bridge deck; Diaphragm -to -rib welded joint; Fatigue crack; Crack -growth characteristics; Maintenance occasion
Funding
- National Key Research and Develop- ment Program of China [2017YFE0128700]
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In this study, the crack-growth characteristics at different lengths were investigated through numerical simulation and fatigue tests. Reasonable maintenance occasions and classified maintenance methods for diaphragm-to-rib welded joint cracks were proposed, which are of great significance for maintenance of such joints.
The crack-growth characteristics at different lengths are diverse, while blind maintenance for cracks cannot achieve satisfactory arresting effect. By carrying out numerical simulation and fatigue tests of diaphragm-to-rib welded joint (DU) specimens, the crack-growth rates, morphology and stress state at the crack tip were explored. The crack-growth process was segmented and reasonable maintenance occasions for DU cracks were proposed. The result shows that the oblique DU crack is affected by in-plane shear under out-of-plane deformation of diaphragm, driving the crack to grow to the horizontal. The DU crack presents the three-stage characteristics of fast-slow-rapid growth with the approximate demarcations of 8 mm and 40 mm. It is recommended to carry out maintenance in the first two stages to avoid entering the third rapid-growth stage. Combined with the applicability of maintenance technologies, classified maintenance methods of ICR, drilling and bolt reinforcement were proposed for cracks in three stages, respectively.
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