仿古建筑方钢管混凝土柱-钢筋混凝土圆柱连接 抗震性能试验研究.

According to the experiments of four imitated ancient building connections between concrete filled square steel tubular columns (CFST) and reinforced concrete circular columns ( RC) under low cyclic reversed loading, the failure modes under different axial compression ratios were obtained. The hysteretic loops, skeleton curves, deformability, energy dissipation capacity, stiffness degradation and strength degradation were analyzed. It is shown that the failure modes of CFST-RC column connections are flexural failure, with some characteristics of shear failure. Plastic hinges are formed at the root of CFST column and RC column, and there are obvious shear oblique cracks in the middle and upper part of RC column. The hysteretic loops are full, and the connections have insignificant stillness degradation and strength degradation. As the connections fail, the ductility factor is between 4. 42 and 5.54, and the equivalent viscous damping ratio is between 0. 233 and 0. 311, showing excellent deformation capacity and energy dissipation capacity. In the range of experimental axial compression ratio, the peak load and ductility of the connections increase with the increase of the axial compression ratio. The peak load and ductility of the connections with the same axial compression ratio decrease with the increase of slenderness ratio. [ABSTRACT FROM AUTHOR]