Abstract
A thorough analysis of slender columns under axial force and bending moment requires second order effects assessment. Concretes creep is one of the factors that increase lateral displacements of the bar in the long run. This phenomenon propitiates the instability and reduces its bearing capacity. This paper shows a procedure for assessing rheological effects based on Eurocode 2 method. This procedure will be added to structural analysis software which takes into consideration geometrical and mechanical non-linearity. As an example interaction diagrams for concrete-encased composite columns with different slenderness values are obtained. These diagrams will demonstrate that rheological effects have a greater influence as axial force eccentricity and slenderness values increase.
