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Finite Element Analysis and Theoretical Investigations on Concrete Filled Steel Tubular Columns

This paper presents the behavior and design of axially loaded concrete filled steel tubular (CFST) columns. A numerical investigation on the behavior of concrete filled steel tubular columns loaded in axial compression is presented. Nonlinear finite – element analysis is performed using commercial software ANSYS. The numerical models are used for the computations and the results are validated with the corresponding experimental program from the literature. It is observed that the numerical model is able to map the load deflection response of the CFST specimens. A good agreement is also observed between the experimental and the predicted numerical results. The column strength predicted from the finite element analysis and by using the Lu and Zhao (2008) are compared with the corresponding experimental results obtained from the literature. The comparative results ensured that D/t ratio plays a prominent role on the compressive behavior of the CFST specimens. This paper quantifies the difference between the experimental and numerical results, and the ultimate load of the CFST columns estimated by various International code procedures.