Fatigue resistance of welded steel tubular X-joints |
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| Institution: | 1. School of Computing, Engineering and Mathematics, Western Sydney University, Sydney, NSW 2751, Australia;2. School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia;3. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | High-cycle fatigue experiments are performed on welded tubular steel X-joints, with braces and chord of equal diameter. They are scaled-down joints, used extensively in offshore wind platforms. Three different welding procedures are considered in specimen fabrication: manual, fully-automatic and manual with HFMI post-weld treatment. Τwo possible locations for crack initiation were identified: chord “crown” and “in-between location”, also verified by numerical calculations and fractography of failed specimens. Monotonic loading tests on fatigue-cracked specimens showed good performance in terms of ultimate strength and deformation capacity, despite the presence of through-thickness cracks. The results are compared with predictions from relevant design standards. |
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| Keywords: | Welded tubular joints Fatigue of welds Offshore wind platform Residual structural strength Fatigue testing |
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