Analytical Study on Capacity and Ductility for Composite Column Under Different Areas Loading

Abstract

the main purpose of this research is to study analytically the CFT columns using the finite element method. ANSYS computer program is employed, in order to evaluate the behavior of the CFT short columns. 3-D finite element model is presented and calibrated successfully in order to predict the performance of the CFT columns under axial static loading. This paper presents the results of analytically study on the performance of axially loaded concrete-filled steel box columns subjected to different loading cases. The study investigates the effect of these loads on both axial capacity and ductility of CFT columns for different loading cases. The study investigates the effect of these loads on both axial capacity and ductility of CFT columns for different loading cases. This effect is studied for each type of loading individually. From the results it is obvious that in case CFT columns with load acting on total area of steel and concrete increasing both stiffness and strength can be attributed to the composite action between the steel tube and the concrete infill. Therefore, the composite action between the steel tube and the concrete not only The steel tube work as longitudinal reinforcing bars to resist the loads as ties or spirals to confine the concrete infill but also both strength and ductility of the concrete are enhanced.