Abstract
Concrete filled steel tube columns are composite members consisting of steel tube filled with concrete. Due to superior properties CFST columns are preferred for offshore oil platforms and marine structures. In this study, numerical analysis of CFST columns subjected to axial compression is carried out using ABAQUS. The inelastic behaviour of concrete is defined in the model using concrete damaged plasticity (CDP) parameters. CDP values and steel tube properties given as input in the model are obtained from literature.The diameter of CFST columns considered in this study is 152.4 mm. In the present study steel tubes with different thicknesses of 4.5, 4.8 and 5.4 mm are considered as per IS:1161–2014. Length of CFST columns considered for this study are 304.8, 457.2, 609.6 and 762 mm i.e aspect ratio of 2, 3, 4 and 5. The grades of infill concrete used in CFST columns are M 20, M 30 and M 40. Load carrying capacity of CFST columns are calculated using Euro code and compared with FEM results obtained from ABAQUS. Fromthis study, it is observed that with increase in grade of concrete the load carrying capacity increases, whereas stress and deformation decreases. FEM results are observed to be in good coordination with Euro code results.
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