Effect of the Steel Ring Width Variations as the External Confinement on Load - Moment Interaction Behavior of Reinforced Concrete Column

Abstract

In the present construction world we often require higher capacity and ductility of structural member, particularly in reinforced concrete column. One way to improve the ductility and carrying capacity of concrete is confinement of the concrete. To investigate the effects of external confinement on column capacity an analytical study is carried out. A steel ring external confinement is used in this study. The stress-strain diagrams design for confined concrete are developed by considering different proposed confined models due to width variations of the steel ring. The test results showed that the steel ring effective as external confinement in the concrete confining. Capability of concrete to support load simultaneously increases with the width of the ring. Its effect on column capacity is studied in terms of load - moment interaction diagram of column. The presence of external reinforcement expands the interaction diagram of the column particularly when it is in the compression-controlled region.