Strength of external-ring-stiffened tubular X-joints subjected to brace axial compressive loading

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

Research output: Contribution to journalArticleResearchpeer-review

18 Citations (Scopus)

Abstract

This paper presents the results of numerical and analytical studies to obtain ultimate strength enhancement coefficient (R e ) equations for external-ring-stiffened circular hollow section (CHS) X-joints under axial compression. The FE modeling approach is validated by the results of axial compressive experiments conducted in the authors’ previous research on six X-joints with and without stiffeners. In all, 160 unstiffened and ring-stiffened FE models of CHS X-joints subjected to brace axial compression were investigated. The effects of the brace-to-chord diameter ratio β the ratio of chord diameter to twice the chord wall thickness γ the stiffening ring width factor β r (i.e. 2b r /d 0 where b r is the ring width and d 0 is the chord diameter), and the stiffening ring thickness factor τ r (i.e. t r /t 0 where t r is the stiffening ring thickness and t 0 is the chord wall thickness) on the structural behavior of external-ring-stiffened CHS X-joints were evaluated. Parametric analysis showed that the ultimate strength enhancement coefficient R e decreased with the increase in the diameter ratio between the brace and the chord β but once β exceeded 0.4, the effect on R e was slight. Furthermore, the ratios of chord diameter to twice the chord wall thickness γ the stiffening ring width factor β r , and the stiffening ring thickness factor τ r were all positively correlated with improvement in the ultimate strength of the external-ring-stiffened CHS X-joints. An analytical formula based on the yield volume model was derived to predict the ultimate strength enhancement of external-ring-stiffened X-joints.

Original languageEnglish
Pages (from-to)17-26
Number of pages10
JournalThin-Walled Structures
Volume133
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Axial compression
  • CHS X-joint
  • External stiffening ring
  • Finite element method
  • Parametric analysis
  • Yield volume model

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