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

F. R. Mashiri, X. L. Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)463-472
Number of pages10
JournalThin-Walled Structures
Issue number4
Publication statusPublished - Apr 2007
Externally publishedYes


  • Design
  • Fatigue
  • In-plane bending
  • Stress concentration factor
  • Thin-walled tube
  • Welded connections

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering


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