Finite element analysis on the flexural behaviour of concrete filled steel tube beams

Concrete-filled steel tube (CFST) beams are studied and verified by the Finite Element program ANSYS against experimental data. In the numerical analysis, the cross sections of the CFST are square steel sections, and sections strengthened by being filled with normal mix concrete and quarry waste concrete. Numerical analyses have shown that for square CFST a good confining effect can be provided. This effect is enhanced especially by the filling.