Predicted compressive stress–strain model for high-strength stirrup confined concrete

Abstract

Concrete may be successfully contained by high-strength steel bar, increasing its strength and deformation capacity. This research conducts an analytical and experimental investigation to better understand the confining mechanism of high-strength bar on concrete. The impact of concrete strength, stirrup strength, volume-stirrup ratio, and stirrup spacing is explored using regression analysis on test data of stress–strain curves of concrete confined by high-strength stirrup. Stress analysis and regression are used to provide techniques for calculating peak stress and strain, as well as ultimate strain, in confined concrete. Based on current stress–strain curve models, a stress–strain curve model for confined concrete with high-strength stirrup with ascending, descending, and horizontal branches is developed. The findings reveal that the suggested model's stress–strain curves correlate very well with the experimental curves.