Abstract：Research purposes:For the purpose of improving seismic behaviors of the cantilever columns, which are usually used in single-row column structures such as platform canopy and urban metro, the paper proposed a concrete core separation column composed of an inner column and an outer ring column, and put forward two types of connection columns with connectors and without connectors between the inner column and the outer ring column. We conducted the low-cycle reversed loading test of two large scale dimension specimens and numerical analysis with multi-parameters. The stiffness degradation, bearing capacity, ductility and energy dissipation of two columns were investigated, and the optimal design parameters such as the diameter ratio of inner and outer columns and the area ratio of longitudinal reinforcement were obtained. Research conclusions:(1) The bearing capacity, energy consumption and elastic stiffness of the two core-separation composite columns are slightly lower than those of solid columns with the same reinforcement. However, when the concrete at the bottom of the column is broken, the damage of the inner column is less, and the yield of longitudinal reinforcement is significantly later than that of the outer column. The inner column can serves as the second seismic line of defense effectively. (2) Most of the concrete connectors in the column with connectors are in the plastic stress state and the initial stiffness is larger than that of the column without concrete connectors, but the energy dissipation capacity is slightly poor. (3) When the radius ratio of inner and outer circular columns is 0.4 and the reinforcement area ratio is 1 ∶2~1 ∶3, the two types of concrete core separation composite columns have better seismic behavior. (4) The relevant results can provide reference for the design of single column cantilever structure such as platform canopy.
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2022, Vol. 39 
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