BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Volumul 62 (66), Numărul 4, 2016 Secţia CONSTRUCŢII. ARHITECTURĂ COMPARATIVE ANALYSIS OF TWO COMPOSITE COLUMNS BY CĂTĂLIN MOGA, RALUCA NERIŞANU * and DELIA DRĂGAN Technical University of Cluj-Napoca, Faculty of Civil Engineering Received: December 08, 2016 Accepted for publication: December 29, 2016 Abstract. The composite steel-concrete compression members can be made in two constructive solutions: members with concrete partially or total encased sections and members with concrete filled rectangular and circular tubes. This paper presents a comparative study concerning the plastic resistance of a concrete-filled rectangular square steel section and a concrete-filled circular hollow steel section, when the composite column is subjected to axial compression. Keywords: composite steel-concrete columns; rectangular section; circular section; comparative analysis. 1. Introduction The composite steel-concrete compression members can be made in two constructive solutions (Fig. 1) (SR EN 1994-1-1/2006; Moga, 2010): – members with concrete partially or total encased sections (Fig. 1a; b; c); – members with concrete filled rectangular and circular tubes (Fig. 1d; e; f). In the case of composite steel-concrete compression members, the mechanism by which shear stresses can be transferred over the interface between the structural steel component and the encased concrete are adhesion, * Corresponding author: e-mail: Raluca.Nerisanu@cfdp.utcluj.ro