Fatigue design of welded very thin-walled SHS-to-plate joints under in-plane bending

F. R. Mashiri, X. L. Zhao, P. Grundy, L. Tong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)


The existing fatigue design S-N curve for SHS-to-plate T-joints under in-plane bending is given in the Canadian Standard, CAN/CSA-S16.1-M89, in terms of the classification method. That S-N curve is however based on the class of longitudinally loaded plates with welded non-load carrying attachments, which are different from the SHS-to-plate T-joints. The increased use of welded thin-walled (t<4 mm) tubular joints in the road transport and agricultura industry for applications such as lighting poles, traffic sign supports, truck trailers, swing ploughs, haymakers and linkage graders, means that there is a need to develop fatigue design curves for tubular joints where the tube wall thickness is less than 4 mm. This paper aims to determine fatigue design curves for SHS-to-plate T-joints where the thin-walled tubes have a thickness of less than 4 mm. Tube-to-plate T-joints, made up by welding a square hollow section tube to a plate, are tested under fatigue loading. Constant stress-amplitude cyclic loading is applied to these connections as in-plane bending load. Stress concentration factors (SCFs) have been determined from strain distributions obtained using strain gauge measurements. Analysis of the fatigue test data using least squares method is carried out to determine the design curves of the tube-to-plate T-joints under in-plane bending, for both the classification method and the hot spot stress method. A class of 44 is recommended for the classification method. An Sr.hs-N curve is proposed, with a recommended SCF of 2.0 for the hot spot stress method.

Original languageEnglish
Pages (from-to)125-151
Number of pages27
JournalThin-Walled Structures
Issue number2
Publication statusPublished - Feb 2002
Externally publishedYes


  • Classification method
  • Fatigue design
  • Hot spot stress method
  • S-N curve
  • Stress concentration factor
  • Thin-walled section
  • Tubular joint
  • Welded connectionA

ASJC Scopus subject areas

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


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