Tests on plain and steel fiber concrete-filled stainless steel tubular columns

This paper reports the experimental behavior of plain and steel fiber concrete-filled stainless steel tubular columns under biaxial bending and axial compression. In the experimental study, the length-to-diameter ratios of the stainless steel tubes were 12, 15, and 20. The effects of the main test parameters of concrete compressive strength, cross-section, load eccentricity, steel fiber material and slenderness on the structural behavior of plain and steel fiber concrete-filled stainless steel tubular columns were examined. The ultimate strength capacities, load-deflection relations, and load-axial strain behavior were observed in the tests. The plain and steel fiber concrete-filled tube columns have been analyzed with a theoretical method based on the nonlinear behavior of the materials. The experimental and theoretical biaxial load-deflection diagrams have been obtained and compared in the study. The experimental results have exposed significant knowledge to describe the behavior of plain and steel fiber concrete-filled stainless steel tubular columns.