Application of High-Strength Concrete-Filled Steel Tube Columns in Residential Structures

Abstract

This study aims to investigate and evaluate the efficiency of high-strength concrete-filled steel tube (HSCFST) structures for residential applications. It addresses challenges such as the shortage of skilled labor, rising labor costs, and the need to reduce construction time and expenses. The study examines four three-story residential buildings by modeling their structures using ETABS software to analyze their vertical and seismic load-bearing behavior. The design of the HSCFST columns follows the AISC 360-22 standard and the Load and Resistance Factor Design (LRFD) method. The design results indicate that the column size can be reduced to 125 mm and 150 mm, ensuring that the column dimensions do not exceed the wall thickness by using concrete with a compressive strength exceeding 60 MPa in combination with commercially available steel tubes. The analysis of all four buildings demonstrates that the designed structures exhibit superior load-bearing and seismic performance compared to conventional reinforced concrete structures in all aspects. Furthermore, the findings reveal that HSCFST columns significantly reduce construction costs compared to reinforced concrete columns.