Capacity of steel CHS X-joints strengthened with external stiffening rings in compression

Lei Zhu, Kai Yang, Yu Bai, Hailin Sun, Miao Wang

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33 Citations (Scopus)


This paper studies steel circular hollow section (CHS) X-joints by conducting experiments on the axial compressive strength of unreinforced and reinforced X-joints with external stiffening rings. Three pairs of unreinforced and reinforced X-joints were tested to compare their compressive load capacity. The diameter ratios (β) between the brace and the chord β were 0.25, 0.51 and 0.73 respectively. The experimental setup, parameters and results are presented. The failure modes and load-displacement curves of the unreinforced and reinforced X-joints were compared. It was shown that external stiffening rings greatly increased the axial compressive load capacity of the X-joints, by 86%, 75%, and 58% respectively. Finite element modelling accurately predicted the structural responses of the X-joints with and without external stiffening rings. © 2017 Elsevier Ltd
Original languageEnglish
Pages (from-to)110-118
Number of pages9
JournalThin-Walled Structures
Publication statusPublished - 1 Jun 2017


  • Axial compressive strength
  • CHS X-joint
  • External stiffening ring
  • Finite element method
  • Tubular joint
  • Compressive strength
  • Reinforcement
  • Axial compressive load
  • Circular hollow section
  • Finite element modelling
  • Load-displacement curve
  • Stiffening rings
  • Structural response
  • Tubular joints

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