Mechanical Behavior of Circular Concrete Filled Steel Tube Column under Axial Loading for Sustainable Building

Abstract

This paper presents an exploratory evaluation of the CFST columns under axial loading with different thicknesses of outer steel tube and column diameters. 4 mm and 5 mm outer steel tube with 100 mm, 125 mm, 150 mm outer diameter, and concrete of grade M30 was used in this study. The systematic outcomes are validated with the corresponding investigational by comparing its ductility index, secant stiffness, maximum confining pressure, and load-deformation behavior under axial loading on CFST columns. Many schemes were generated to evaluate the best set of parameters under axial loading to get the behavior of CFST columns. After studying the various increments of loading, the concrete began to fail from the center of the longitudinal section. This failure ends up at each end of the longitudinal section. This load transfer can resume from the middle of the longitudinal section. At this time the concrete begins to skinny from the middle and also the tension within the steel tube is targeted within the center of the longitudinal section. The load versus displacement graph is designed to evaluate the performance of the CFST column under axial loading.