Numerical Investigation on Load-carrying Capacity of Concrete filled steel tubular columns under axial loads

Abstract

The Concrete Filled Steel Tubular (CFST) columns are an interesting option in many modern
structures in recent years due to their exquisite structural performance, with enhanced loadbearing
capacity and energy absorption capacity. This investigation presents a Statistical study,
Experimental study, and Support Vector Machine Technique (SVM) on the axial load carrying
capacity of concrete-filled steel tubular columns. Results of tests conducted by various researchers
on two hundred and thirteen samples on concrete-filled steel tubular columns are reported,
and present authors’ experimental data of ninety specimens self-consolidating fiber-reinforced
concrete-filled steel tube columns are reported. Two companion equations were derived for the
prediction of the ultimate axial load strength of concrete-filled steel tubular columns, and two
more equations were derived using the SVM technique. The main parameters considered in the
Equation One were - Area of Concrete, Compressive Strength of Concrete, Area of Steel, Tensile
strength of Steel and in Equation Two - Non-Dimensional parameter (D/t), Area of Concrete,
Compressive Strength of Concrete, Area of Steel and Tensile strength of Steel. The results from
prediction were compared with the experimental data. Validations to the experimental results were
made. These comparisons show that SVM has strong potential as a feasible tool for predicting
the ultimate axial load carrying capacity of concrete filled tubular columns.