关键词: 土木工程, 高强约束混凝土, Z形柱, 截面延性

Abstract: The cross-section ductility indexes of the confined high-strength concrete Zshaped column were calculated and analyzed under different loading conditions by means of the developed numerical analysis program for the confined highstrength concrete Z-shaped columns.The parameters affecting the cross-section ductility, such as the loading angle, the axial compression ratio, the concrete strength, the longitudinal reinforcement ratio, the hoop reinforcement ratio, and the cross-section size, etc., were investigated. The results show that the main parameters（in descending order）include the loading angle, the axial compression ratio, the concrete strength, and the hoop reinforcement ratio. The regressions were made between the crosssection ductility and the main parameters and calculation expressions were derived, providing a reference for the calculation of the ductility of the confined highstrength concrete Zshaped column cross-sections.

Key words: civil engineering, confined highstrength concrete, Zshaped column, crosssection ductility