Mechanical performance of square high-strength steel and high-strength concrete medium-long columns with built-in reinforcement cages under eccentric compression

Abstract

In this paper, a total of 12 square high-strength steel and high-strength concrete medium-long column specimens were tested and investigated for their mechanical properties under axial and eccentric loading. These specimens were characterized by various parameters, including different cross-sectional width-to-thickness ratios, loading eccentricities and internal reinforcement cage shapes. The results reveals that the built-in reinforcement cage can improve the ultimate load capacity and ductility of the specimens, while altering the cage tensile shape has minimal impact on their mechanical properties. As the width-to-thickness ratio and eccentricity increase, the ultimate load capacity and flexural stiffness of the specimens decrease, and higher eccentricity leads to reduced ductility.