Parametric analysis on behavior of concrete filled steel (Single and double skin) tube columns under axial loading

Abstract

In recent decades, the application of concrete-filled singleand double skinsteel tube columns in moderate and highrisestructures has expanded rapidly henceunderstanding the influence of various parameters on the axial load characteristics of composite columns has become a top priority. A parametric investigation of the action of concrete-filled single skin and double skin tube columns under the influence of axial load is presented in this research. A numerical finite element analysis with the help of ABAQUS/CAE 6.14 software is carried out considering the various parameters such as varying grade of steel tube and concrete core, steel tube thickness, ratio of diameter-to-thickness of columns and slenderness ratio of column specimens. All of the variables studied have a significant impact on the CFST (single skin and double skin) columns'axial compressive strength, and these factors are addressed in detail in this work. The study revealed that growing ratio of diameter to thickness reduces the ultimate load capacity of both type of composite columns. It is also observed that when there is an increase in the steel and concrete grade, the loading capacity of the columns gets enhanced. Also, reduced length-to-diameter ratio is found to improve the axial loading capacity of columns. The axial strength of concrete filled single skin tube columns (CFST) is found to get highly influenced with the variations of all the different parameters as compared to concrete filled double skin tube columns.