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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, 45 (4). pp. 463-472. ISSN 0263-8231

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Abstract

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
Keywords: Thin-walled tube; Welded connections; Fatigue; Design; Stress concentration factor; In-plane bending
Journal or Publication Title: Thin-Walled Structures
Publisher: Elsevier
Page Range: pp. 463-472
ISSN: 0263-8231
Identification Number - DOI: 10.1016/j.tws.2007.03.002
Additional Information:

The definitive version is available at http://www.sciencedirect.com

Date Deposited: 07 Apr 2008 14:08
Last Modified: 18 Nov 2014 03:33
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