Superposed Buckling Strength of Concrete filled Steel Tubular Columns Steel Tube with Elastic - Perfectly - Plastic Stress - Strain Relation

Abstract

In a previous paper, authors calculated buckling strength of concrete filled steel tubular columns in two different ways. One is performed using the tangent modulus theory (Nsc), considering steel portion and concrete portion behave as a one body. The second one is the method of superposed strength in which a simple sum of separately computed buckling load of steel and concrete columns is regarded as a buckling strength (Ns+c). Ramberg-Osgood equation was used as the stress-strain relations of a steel tube in the paper. In this paper, elastic-perfectly-plastic stress-strain relations are used. Effect of the analytical parameters on the correspondence between the two strength is examined.