STRUCTURAL PERFORMANCE AND AXIAL LOAD LIMIT OF CONCRETE FILLED STEEL SQUARE TUBULAR COLUMNS

Abstract

The objectives is to study the strength and behavior of concrete filled steel square tubular columns subjected to constant compressive load and repeated bending. As the test parameter, width-thickness ratio of steel tube, axial load ratio on a column and existence of filled concrete are selected. Total thirty-six concrete filled steel tubular columns are tested. From the test results, inelastic behavior, maximum strength, energy dissipation capacity and deformation capacity are discussed. We have shown relations between axial load ratio and critical rotation angle of a column.