Abstract
Concrete filled steel tubular (CFST) members comprise of a hollow steel section of circular or rectangular shape filled with plain or reinforced concrete. Concrete-filled double-skin tubular (CFDST) columns are formed by sandwiching concrete between two concentric hollow steel tubes. When compared to a traditional concrete-filled steel tube (consisting of a single hollow steel tube instead of two), the CFDST column is found to have greater axial, flexural, and torsional strengths as well as improved strength-to-weight ratios. They are widely used in high-rise and multi-story buildings as columns and beam-columns. This paper presents the analytical results obtained by using ANSYS software and to develop various kinds of CFDST columns by varying cross-sections, by providing stiffeners and by changing the position of the reinforcements. And also to plot the load-deformation curve and to evaluate the load-carrying capacity of the different models. From the analysis, it is concluded that the square–squaren CFDST with plain stiffeners attached to the outer steel tube has the best axial load carrying capacity.
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