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制作4根钢筋加劲的T形截面钢管混凝土柱、1根非加劲T形截面钢管混凝土柱和1根T形截面钢筋混凝土柱试件,对其进行低周往复水平荷载作用下的滞回性能试验,研究其破坏模式和滞回性能,分析钢筋加劲肋的作用机理以及钢管对混凝土的约束作用。结果表明:相比T形截面钢筋混凝土柱,T形截面钢管混凝土柱破坏程度有明显减轻,刚度、承载力以及耗能性能均有明显提高;钢筋加劲肋能有效限制钢板局部屈曲和阴角处钢管与混凝土脱离,保证钢管和混凝土共同工作,对拉钢筋加劲肋相对锯齿形钢筋加劲肋的效果更加显著;含钢率较高的钢管混凝土柱承载力更高,耗能能力更好;轴压比从0.2增加到0.4时,钢筋加劲的T形截面钢管混凝土柱的承载力增大,延性降低。
Four hysteretic T-section CFST columns, one non-stiffened T-section concrete-filled CFST column and one T-section RC column specimen were made, and their hysteretic behavior under low cyclic reciprocating horizontal loading , Study its failure mode and hysteretic behavior, analyze the mechanism of reinforcement rib and the constraint of steel tube on concrete. The results show that compared with T-section reinforced concrete columns, the damage degree of T-section CFST columns is significantly reduced, and the stiffness, load-carrying capacity and energy dissipation performance are obviously improved. Reinforcing ribs can effectively limit the local buckling and the corner of steel Steel pipe and concrete detachment, to ensure that the steel pipe and concrete work together, the effect of the tensile reinforcement rib relative jagged rebar stiffener more significant; higher steel content of the concrete filled steel tube column bearing capacity higher, better energy dissipation; axial pressure When the ratio is increased from 0.2 to 0.4, the bearing capacity of reinforced concrete column with T-shaped CFST increases, and the ductility decreases.