Hieng Ho Lau
Curtin University Sarawak, Malaysia
Title: Non-linear behavior of back-to-back built-up cold-formed steel columns under compression: Finite element modeling and parametric study
Biography
Biography: Hieng Ho Lau
Abstract
This paper presents a numerical investigation on the behavior and design of back-to-back built-up cold-formed steel channel columns subjected to axial compression. Numerical models were developed using general purpose ï¬nite element (FE) package ABAQUS and have been veriï¬ed using experimental data reported by the authors recently (ting. et. al (2017). Developed finite element models included material nonlinearities as well as initial geo- metric imperfections. Axial strength of columns, failure modes, deformed shapes at failure, load-displacements were predicted from the finite element analyses and obtained comparisons with test results showed considerable match. A comprehensive parametric study has been carried out covering a wide range of slenderness for the considered back-to-back built-up columns. Axial capacities obtained from the numerical study were used to assess the performance of the current North American standards(NAS) and Australian and New Zealand Standards when applied for cold-formed back-to-back built up columns; obtained comparisons showed that NAS and the Australian and New Zealand Standards are un-conservative for stub and short columns sections which were failed by local buckling whereas standards were over-conservative for the strength of columns which were failed mainly by overall member buckling.