Behaviour of Concrete Infilled Duplex Stainless Steel Circular Columns and Beams

This paper presents an experimental, theoretical and numerical investigation on the behaviour of concrete in filled duplex stainless steel circular columns and beams. Thebehaviour of columns was investigated using different size of columns calculated based on slenderness ratio varies from 50, 60 to 70 and diameter of 50mm. A series of test was carried out to investigate the mechanical properties of the materials used for this research, concrete cubes, cylinders and beams of grade M20 was casted and tested with conventional concrete and concrete reinforced with steel fibre as part of preliminary test. The parametric study for this research are slenderness ratio, deflection, axial shortening, ultimate load, strain and effect of conventional concrete and concrete reinforced with steel fibre as in filled. Three hollow and six composite duplex stainless steel columns was casted and tested with conventional concrete and concrete reinforced with steel fibre. Finite element analysis was carried out for both hollow and composite duplex stainless steel column using commercial software package ANSYS 12 (ANSYS Mechanical APDL). The material properties obtained from experimental investigation were used to model both duplex stainless steel and concrete. The test strength was compared with the design strength calculated using international standards such as American code(ACI 319–1999), AISC-2005 and BS 5400. The resultsindicate that the use of fibre reinforced concrete as infill material in duplex stainless steel (DSS) columns has a considerable effect on the strength and behaviour of slender composite columns.