Confinement mechanism of angle steel-corrugated steel plate confined concrete columns under compression

Abstract

To enhance steel efficiency and reduce energy consumption in construction, a novel angle steel-corrugated steel plate confined concrete (A-CSC) column has been developed. This composite column is constructed by welding outward-facing angle steel at the corners to side corrugated steel plates, with the core filled with concrete. The angle steel primarily carries axial loads, whereas the corrugated steel plates offer confinement to the concrete and bear shear forces. This study investigates the axial compression behavior of these composite columns through experiments and finite element method (FEM) analyses. The findings indicate that the corrugated steel plates effectively confine the concrete without experiencing local buckling before the columns reach their peak load, even when the corrugated steel plate has a large width-to-thickness ratio. Based on the experimental data, load-axial strain curves for each component were derived using an internal force decomposition method. Subsequently, a constitutive model was proposed for the concrete confined by the corrugated steel plates in fiber model. Finally, an equivalent cross-section analysis was conducted to develop a load-bearing capacity calculation formula applicable to components with varying sectional depth-width ratios.