Theoretical and Experimental Studies on Composite Steel – Concrete Columns

Abstract

This paper presents some results of theoretical and experimental analysis of composite steel-concrete (SC) columns, which are completely or partially concrete-encased steel members. In practice, most composite SC columns are relatively slender. In design the second - order effects will usually need to be included. The main topic of the paper is a theoretical analysis of the second - order theory at composite (SC) columns.According to the results of the experiments, which were made in the Department of Concrete Structures and Bridges, Slovak Technical University of Technology in Bratislava (total of 18 columns were tested in two series), the effects of the second - order theory were analyzed. The experimental results were compared with theoretical from the model developed in the non-linear software Atena 3D.The evaluation of the results is also shown in comparison with the general design method according to Eurocode 4, Design of composite steel and concrete structures - Part 1.1: General rules and rules for buildings (EN 1994-1-1).