Research on nonlinear full-range analysis methods of z-shaped R.C. Columns

In this paper, a method of nonlinear analysis of Z-shaped R.C. columns is put forward while the full path of stress-strain relation of concrete and the role of hooped reinforcement are all considered. A computer program for a full range of analysis of special-shaped columns is compiled. Based on the analytical results of three cross-sections of Z-shaped R.C. columns, some general principles of ductility and bearing capacity of Z-shaped R.C. columns are given while the ‘M-Φ’ and ‘M-N’ curves are analyzed under the change of angle of load, the limit value of axial compression ratio and ratio of hooped reinforcement,etc.