Buckling strengths of Cold-Formed Built-up Cruciform Section Columns under axial compression

Jelena Dobrić*, Nina Gluhović, Nenad Fric, Xiongfeng Ruan, Marina Bock, Barbara Rossi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This paper describes experiments addressing the buckling and collapse behaviour of cold-formed stainless steel cruciform section columns. Doubly symmetrical flanged cruciform section columns were built using six individual press-braked plain channels made of austenitic grade EN 1.4307 assembled back-to-back. Three different column lengths were tested – namely, short (600 mm), intermediate (1200 mm) and long (2400 mm) lengths, and two channel geometries were used in all tests – with cross-section depths of 200 mm and 100 mm. Tests were carried out under pure axial compression and with fixed end support conditions. Tests were repeated two times for each length. It was observed that the buckling patterns were affected both by the global slenderness and by the spacing between the fasteners. Stocky columns experienced local buckling of the individual channel sections. The plastic failure mechanism was dependent on the fasteners spacing. Intermediate slenderness columns were characterised by interaction between global torsional buckling and local buckling whereas more slender columns failed predominantly through torsional buckling. For the latter, the spacing between the fasteners had a minor influence on the ultimate capacity.
Original languageEnglish
Article number111879
Number of pages38
JournalThin-Walled Structures
Volume200
Early online date8 Apr 2024
DOIs
Publication statusE-pub ahead of print - 8 Apr 2024

Bibliographical note

Copyright © 2024 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

Data Access Statement

Supplementary materials available via article.

Keywords

  • Built-up columns
  • Discrete fasteners
  • Local buckling
  • Shear stiffness
  • Stainless steel
  • Torsional buckling

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