Buckling and Post-Buckling Behavior of Lipped-Channel Columns Undergoing Distortional-Global Interaction at Elevated Temperatures

Resumo

This study investigates the behavior of cold-formed steel fixed-ended lipped-channel columns
undergoing distortional-global (D-G) interaction at high temperatures. It extends the scope of previous works by

including columns exposed to temperatures up to 800o C due to fire conditions with a different temperature-
dependent material model. The columns' dimensions and lengths were chosen to provide true D-G interaction.

ABAQUS shell finite element analyses were conducted to obtain elastic-plastic post-buckling equilibrium paths,
failure loads, and collapse modes for these columns. The AZ/NZS 4600 (2018) constitutive model was employed
to account for the steel behavior at high temperatures. Several room-temperature yield stresses were considered to
cover a wide slenderness range. The numerical failure loads provided insights for further studies, including
remarks to be taken into account in the future proposals of DSM-based curves, more specifically in the sense of
considering the effects caused by the variation of the non-linearity of the steel stress-strain curves with temperature.