Slenderness Effect for The Composite RC Columns with Steel Angles at The Corners; Experimentally and Analytically

Abstract

The study focuses on the application of composite columns, utilizing four steel angles at the corners of the concrete column welded together with a transverse plate, and contrasting the experimental findings with those produced by structural analysis programs using ANSYS. Three square composite columns are included in the experimental test program under axial compression, and the primary variables are the longitudinal reinforcement ratio and steel angle thickness. Investigations are conducted into the axial and horizontal deformations, load capacity, failure mode, and axial and lateral strains of composite columns. In order to review the impact of the slenderness ratio on the behavior of composite columns for parametric study, more numerical models are utilized. The results indicate that there are two primary phases to the failure process. Localized buckling in the longitudinal reinforcement occurs in the second stage, after the concrete cover has been crushed or spalled in the first stage. The impact of steel angle thickness according to experimental results: axial strain, lateral strain, horizontal displacement, and axial displacement decrease with increasing steel angle thickness. The percentage of decrease for axial displacement is between 11% and 20%; for horizontal displacement, it is between 16% and 20%; for axial strain, it is between 4% and 10%; and for lateral strain, it is between 13% and 22%. But the load capacity increases with increasing steel angle thickness