Avaliação experimental e numérica de colunas tubulares mistas CFDST (aço inoxidável, concreto, aço carbono)

Abstract

This work studies the structural behaviour of composite concrete filled double-skin tubular columns made of an inner carbon steel tube and an outer stainless steel. This structural system is widely used in Asian countries and combines the advantages of all three types of materials, also having additional advantages of aesthetics, corrosion resistance and durability that outer stainless steel offers. Experiments were performed on circular stub columns under axial compression. The experimental results were after compared with those obtained by a nonlinear computational analysis using the ABAQUS finite element program and by a design methodology from the technical literature for this type of column. After the numerical model validation, a parametric analysis was also developed focusing on the influence of the hollow ratio between the columns and the outer and inner thickness of the tubes. These results were also compared to the design formulae present in the literature. It was verified the efficacy of the design methodology from the technical literature for this structural element. Also conclusions were obtained regarding the deformed configuration and the influence of geometric parameters on the strength of these columns.