Post buckling mechanics and strength of cold-formed steel columns exhibiting Local-Distortional interaction mode failure

Hareesh Muthuraj , S.K. Sekar , Mahen Mahendran , O.P. Deepak

Abstract

This paper reports the numerical investigation conducted to study the influence of Local-Distortional (L-D) interaction mode buckling on post buckling strength erosion in fixed ended lipped channel cold formed steel columns. This investigation comprises of 81 column sections with various geometries and yield stresses that are carefully chosen to cover wide range of strength related parametric ratios like (i) distortional to local critical buckling stress ratio (0.910.91

Key Words

lipped channel columns; Local-Distortional interaction; secondary bifurcation; cold formed steel; Direct Strength Method (DSM); numerical simulation; Finite Element Analysis (FEA); Generalized Beam Theory (GBT)

Address

Hareesh Muthuraj — School of Civil and Chemical Engineering, VIT University, Vellore, TamilNadu-632014, India
S.K. Sekar — School of Civil and Chemical Engineering, VIT University, Vellore, TamilNadu-632014, India
Mahen Mahendran — School of Civil and Built Environment, QUT, Brisbane, Australia
O.P. Deepak — School of Civil and Chemical Engineering, VIT University, Vellore, TamilNadu-632014, India

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