Influence of height-to-breadth ratio on the behaviors of high strength concrete-filled RHS tubes

A nonlinear numerical program is produced, which can analyze the behavior of high strength concrete-filled rectangular hollow section tubes subjected to different loading conditions. The numerical results are compared with the experimental results, and they agree well. Based on the above, the influence of height-to-breadth ratio on the axial loading stub column, axial loading slender column, eccentric loading member and pure bending member is discussed. The results show that the height-to-breadth ratio (vary from 1.0 to 1.6) has no evident influence on the bearing capacity of axial loading member, but the ductility will decrease with the increasing of height-to-breadth ratio. When the specimens' slenderness ratio are equal, the height-to-breadth ratio has little influence on the (N/N_u)-(M/M_u) interaction curves. The bending moment capacity and the elastic rigidity along major axis will improve with the increasing of height-to-breadth ratio.