The effect of structural parameters on seismic behavior of concrete-filled steel tubular frames with buckling-restrained brace

In order to study the parameters influence on seismic behavior of concrete filled steel tubular (CFST) frame with bucking-restrained brace (BRB), the finite element analysis for CFST frame with BRB is studied in this paper, which is performed under low cyclic loading using the software of ABAQUS. Failure model and skeleton curve are comparative analyzed with the related experiment components, verifying that the finite element simulation of the CFST frame with BRB is effective. By changing the axial compression ratio of the column(n) and the steel ratio(alpha) of the column section respectively, the effect of the structural parameters on the seismic behavior of the CFST frames with BRB had been studied. The results shows that: with the increase of steel ratio of the column section, the lateral ultimate strength and the initial stiffness of the frame get higher, the lateral load(P) versus lateral displacement (Delta) hysteresis curves of the frame get plumper, and the energy dissipation of BRB remain basically unchanged; With the increase of axial compression ratio of the column, the lateral ultimate strength and the hysteretic behavior of the frame become low, whilst the energy dissipated by the BRB get higher.