Built-up axial loaded column FE modelling and design according to STR and EC3

Abstract

The paper reviews behaviour and calculations of axially loaded built-up columns. Calculations were performed according to Lithuanian national code STR 2.05.08:2005 [1] and EC3 [2]. FEM modelling was made as well. Build-up columns with different slenderness ratios of axes y-y and z-z were investigated. The paper deals with two different modes of buckling. The results of performed numerical experiments have suggested correction factors and appropriate buckling modes of the built-up columns. The obtained modelling results were compared with data on analytical calculations made according to STR and EC 3. The FEM analysis of the built-up column has showed that both codes (STR and EC3) are giving safe enough results (except one case) for a considered type of conditions for column support.