Abstract
The purpose of this paper is to investigate the flexural behaviors of active confined concrete columns subjected to especially high axial compression. Primary, off set load tests and cross sectional analysis on the laterally prestressed reinforced concrete columns were performed. Secondary, internal stress conditions on small segmental pieces of such columns in elastic region were examined and analyzed by using 3-D FEM. As a result, laterally prestressing could prevent lateral expansion of the core concrete in the columns, under flexural and compressive stresses, and improve its ultimate flexural strength and deformation capacity. Lateral prestress was acting on same region of the core concrete from internal stress distributions calculated based on the elemental tests.
