圆钢管约束高强混凝土短柱的轴压力学性能研究

he behavior of 18 circular tube confined HSC stub columns was investigated experimentally under cyclic or monotonic axial compression. The parameters in the study include the compressive strength of concrete (fcu=88.14~94.17) and diameter-to-thickness ratio of the steel tube (D/t=21.62~43.01). The experimental results indicate that the axial load strength of a steel tube confined concrete stub column is greater than that of a CFT column with the same parameters, while there is little difference on the ductility of the two kinds of columns. The axial load strength of the columns increases as the longitudinal stress of the steel tube decreases. The results of the elastic-plastic analysis on the steel tube indicate that the steel yields at the peak load point. A design equation to calculate the axial load strength of circular tube confined concrete columns is proposed in this paper.