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Fatigue tests and design of thin CHS-plate T-joints under cyclic in-plane bending


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Mashiri, FR and Zhao, XL 2007 , 'Fatigue tests and design of thin CHS-plate T-joints under cyclic in-plane bending' , Thin-Walled Structures, vol. 45, no. 4 , pp. 463-472 , doi: 10.1016/j.tws.2007.03.002.

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A review of existing fatigue design guidelines has been undertaken and shows that there are no fatigue design recommendations for circular hollow section-to-plate T-joints subjected to in-plane bending. This paper therefore reports on the high cycle fatigue behaviour of welded thin-walled circular hollow section (CHS) tubes of thicknesses less than 4 mm that are fillet-welded onto a plate to form a base plate moment connection. The resultant thin CHS-Plate T-joints are subjected to cyclic in-plane bending load to determine their fatigue strength at different stress ranges. The S–N data from the failed thin CHS-Plate T-joints is analysed using the least-squares method of statistical analysis to obtain a design S–N curve. The derived design S–N curve for the thin CHS-Plate T-joints is compared to existing design S–N curves and also that of square hollow section (SHS)-to-plate T-joints under in-plane bending in current fatigue design guidelines. The thin CHS-Plate T-joints are found to have a better fatigue strength compared to the existing S–N curve for SHS-Plate T-joints under in-plane bending. An appropriate design S–N curve from the group of existing design S–N curves is adopted for the design of thin CHS-Plate T-joints.

Item Type: Article
Authors/Creators:Mashiri, FR and Zhao, XL
Keywords: Thin-walled tube; Welded connections; Fatigue; Design; Stress concentration factor; In-plane bending
Journal or Publication Title: Thin-Walled Structures
Publisher: Elsevier
ISSN: 0263-8231
DOI / ID Number: 10.1016/j.tws.2007.03.002
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