Non-Linear Analysis of Concrete Filled Double Skin Circular Steel Column

Abstract

This paper investigates the behaviour of CONCRETE FILLED DOUBLE SKIN TUBULAR (CFDST) Circular stub columns with steel tubes compressed under concentric axial loads. The CFDST member is a new type of composite construction, which consists of two concentric steel tubes with concrete sandwiched between them. Thus, CFDST columns have a series of advantages, such as high strength, high bending stiffness, good seismic and fire performance, and also having favorable construction ability. The finite element analysis of the CFDST circular column is conducted to validate the finite element model with existing experimental data. The results obtained from the finite element investigation are compared with the strength values predicted using existing formulations in the analytical investigation. A good correlation was found between the values obtained from existing formulations in the analytical investigation.