Optimum confining effect in steel composite hollow RC column with inner tube under compressive load

An internally confined hollow reinforced concrete (ICH RC) column offers strong and durable confinement by the reinforcement of the inner tube. When the concrete in an ICH RC column experiences axial pressure, an inward radial pressure is produced by the arching action. This radial pressure is resisted by the concrete and the inner tube. Previous research considered the outer pressure and inner pressure to be equal. However, the inner pressure...