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为了定量分析不同因素对方钢管再生混凝土柱在低周反复荷载下抗震性能指标的影响,选择再生骨料取代率、含钢率和轴压比为设计变化参数,开展了4根框架柱的拟静力试验。详细观测了框架柱破坏过程中及破坏后的形态,分析了实测滞回曲线,探究了设计变化参数对框架柱承载力、刚度、位移延性系数及耗能能力等抗震性能指标的影响规律。研究表明,方钢管再生混凝土柱的破坏形态同普通钢管混凝土柱相类似,都是柱底部钢管鼓曲、漆皮脱落及核心混凝土被压碎;随着再生骨料取代率的增大,柱的不同阶段的承载力、刚度、延性性能及耗能能力均有所降低;含钢率的增大对试件的位移延性系数、承载力、刚度、耗能能力起到有益作用;随着轴压比的提高,试件的延性性能及耗能能力有所降低,但其极限承载力、刚度却有所增加。
In order to quantitatively analyze the influence of different factors on the seismic performance of concrete-filled square steel tubular columns under cyclic low cyclic loading, the selection of recycled aggregate replacement ratio, steel inclusion ratio and axial compression ratio were used as design parameters to carry out four quasi-static Force test. The observed hysteresis curve was analyzed in detail during the failure process and the failure mode of the frame column. The influence of design parameters on the seismic performance indexes such as bearing capacity, stiffness, displacement ductility coefficient and energy dissipation capacity of the frame column was investigated. The results show that the failure mode of the square steel tube recycled concrete column is similar to that of ordinary steel tube concrete columns, which is the result of the steel tube buckling at the bottom of the column, the peeling of the patent leather and the crushing of the core concrete. As the replacement ratio of recycled aggregate increases, The bearing capacity, stiffness, ductility and energy dissipation capacity of the specimens decreased. The increase of the steel content played a beneficial role in the displacement ductility coefficient, bearing capacity, stiffness and energy dissipation capacity of the specimens. With the increase of the axial compression ratio The ductility and energy dissipation ability of the test piece decreased, but the ultimate bearing capacity and rigidity increased.