Indian Journal of Science and Technology

Abstract

Background/Objectives: Concrete Filled Steel Tube is an emerging construction technique in India. Due to lack of the data available there is no prescribed design code for the same. Methods/Statistical Analysis: Models were created in order to study the behavior of CFST specimen on ABAQUS V6.14. Its validation is done by comparing its deflected shape and axial load capacity with experimental results. After validation of model a specimen was selected and thickness of steel tube was varied keeping diameter of concrete core constant. Effect on axial load capacity due to friction coefficient between concrete and steel was observed. Findings: It was found that plastic hardening using plastic hardening equations gave best results for the confined concrete composite and friction coefficient between concrete and steel tube has no significant effect on axial load capacity. Local buckling was the most common failure in short CFST however in case of long columns buckling failure is also noticed. Axial load capacity of specimen changes linearly with steel tube thickness keeping diameter of concrete core constant. Improvements/Applications: The stresses in individual components of composite at various stages of loading was found which helps in understanding of composite and in creation of design code for the same.

Keywords: Analytical Analysis, Composite, Concrete Filled Steel Tube Columns, Finite Element Method