Stability investigation of local buckling behavior of tubular polygon columns under concentric compression

Ahmed Godat, Frederic Legeron, Dieudonné Bazonga

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

This paper presents experimental tests conducted to investigate the local buckling behavior of thin-walled tubular polygon steel columns. The experimental program consists of six stub columns with three different cross-sections, octagonal (eight-sided), dodecagonal (twelve-sided) and hexdecagonal (sixteen-sided), tested under concentric compression. For each cross-section, two values of the plate slenderness ratio (plate width-to-thickness ratio) are considered. Accurate measurements of geometrical imperfections are taken prior to the test. The experimental results show that the local buckling mode of failure depends on the type of the cross-section. Moreover, the plate slenderness ratio is the main factor controlling the local buckling capacity. Design equations provided in the ASCE 48-05, the EC3 and Migita and Fukumoto to predict the local buckling capacity of tubular polygons are evaluated against experimental results of 22 polygons tested under concentric compression available in the literature. Based on drawbacks observed in the design equations, the Loovs equation developed on basis of the ultimate stress concept is adjusted with new fitting parameters to fit for tubular polygon columns. The accuracy of the new equation is evaluated through a comparison with the experimental results.

Original languageEnglish
Pages (from-to)131-140
Number of pages10
JournalThin-Walled Structures
Volume53
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

Keywords

  • Design equations
  • Experimental data
  • Local buckling
  • Number of faces
  • Slenderness ratio
  • Thin-walled steel
  • Tubular polygon columns
  • Ultimate stress concept

ASJC Scopus subject areas

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

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