CFS lipped channel columns affected by L-D-G interaction. Part I: Experimental investigation

Ben Young, P.B. Dinis, D. Camotim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


© 2017 Elsevier LtdThis work deals with the structural behaviour and ultimate strength of fixed-ended cold-formed steel (CFS) lipped channel columns experiencing various levels of local-distortional-global buckling mode interaction. After briefly addressing the column specimen geometry selection (carefully chosen to ensure more or less closeness between the critical buckling stresses associated with these three buckling mode types), the paper reports the results of an experimental investigation involving a set of 17 columns with several cross-section dimensions, lengths and yield stresses, which is aimed at (i) providing experimental evidence of the occurrence of the triple mode interaction under consideration and (ii) quantifying its effect on the column deformed configuration evolution and failure load erosion (drop). Various aspects concerning the test set-up and procedure are described in some detail before presenting and discussing the obtained column experimental results, which basically consist of (i) measured cross-section dimensions, lengths and initial displacements (geometrical imperfections), (ii) stress-strain curves and yield stresses determined from tensile coupon tests, (iii) recorded non-linear equilibrium paths (applied load vs. various relevant displacements) and ultimate strength values, and (iv) observed deformed configurations and collapse mechanisms. The test results are used, in a companion paper (Part II), (i) to calibrate and validate numerical simulations and (ii) to support the proposal and to assess the merits of design approaches based on the Direct Strength Method (DSM) and intended to handle L-D-G interactive failures.
Original languageEnglish
Pages (from-to)219-232
Number of pages14
JournalComputers and Structures
Publication statusPublished - 1 Sept 2018
Externally publishedYes


  • Buckling mode interaction
  • Cold-formed steel columns
  • Experimental investigation
  • Lipped channel columns
  • Local-distortional-global interaction

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modelling and Simulation
  • General Materials Science
  • Mechanical Engineering
  • Computer Science Applications


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