Experimental and numerical investigation of cold formed lipped channel profiles behaviour under axial and eccentric loading

Yılmaz Y., Öztürk F., Demir S.

3RD INTERNATIONAL CIVILENGINEERING&ARCHITECTURE CONFERENCE, Trabzon, Turkey, 12 - 14 October 2023, vol.1, pp.862-872

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: Trabzon
  • Country: Turkey
  • Page Numbers: pp.862-872
  • Karadeniz Technical University Affiliated: Yes


Purpose: Previous studies have primarily focused on monotonic loading, but this study explores both monotonic and cyclic loading conditions applied to lipped channel profiles, which are commonly used as load-bearing columns in the cold-formed steel industry. The aim of this investigation is to understand the characteristic behaviors of these profiles, including buckling modes, load-carrying capacities, and energy absorption capacities in axial, uniaxial, and biaxial bending modes. Study design/methodology/approach: The CUFSM program was utilized to assess the bearing capacity of the section, calculating local, distortional, and global buckling modes based on profile length and section shape. Critical lengths and load factors associated with these modes were determined. In the experimental study, 15 cyclic loading tests were conducted on 1500 mm long profiles. Subsequently, Finite Element Analyses were performed using ABAQUS software, incorporating strain hardening parameters from axial tensile and very low cyclic tests. The analysis results were then compared with the experimental findings. The load-bearing capacity, energy dissipation, stiffness, and ductility values of the specimens were all computed and evaluated. Findings: The effects of the change in eccentricities on the buckling behavior of the specimens were determined. The lips of the specimens were loaded under compressive (N) or tensile (P) stresses and the differences in bearing capacity, energy consumed, stiffness and ductility values of P specimens under tensile stresses were evaluated compared to N specimens under compressive stresses. Originality/value: The results of this study are expected to contribute to the wider application of cold-formed steel structures, especially in earthquake-prone regions.