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通过8个不同再生粗骨料取代率、轴压比、体积配箍率下的型钢再生混凝土短柱的低周反复加载试验,观察其受力过程及破坏形态,分析了不同设计参数对短柱的荷载-位移滞回曲线、骨架曲线、承载能力、刚度退化、延性及耗能等力学性能的影响。试验结果表明:型钢再生混凝土短柱的主要破坏形态为剪切斜压破坏;试件荷载-位移滞回曲线基本呈梭形;试件达到峰值荷载后,承载力下降较快、变形小、延性较差;再生粗骨料取代率对试件承载力影响不大,延性耗能随着取代率增大而有所减低;随着轴压比的增大,试件承载力提高但延性耗能降低幅度大;随体积配箍率的增大,试件承载力及延性耗能均相应增大。除轴压比较小的短柱外,其余型钢再生混凝土短柱的延性系数均小于3,表明短柱抗震性能较差。因此,在实际工程中应采取相应的措施以改善短柱抗震性能。
Through the low-cycle repeated loading test of the recycled steel reinforced concrete short column with eight different recycled coarse aggregate replacement ratio, axial compression ratio and volumetric stirrup ratio, the force process and failure mode were observed, and the influence of different design parameters on short column Load-displacement hysteresis curve, skeleton curve, bearing capacity, stiffness degradation, ductility and energy dissipation. The test results show that the main failure mode of the short columns of SRCB is shear baroclinic failure. The load-displacement hysteretic curves of the specimens are almost fusiform. After the peak load of the specimens, the bearing capacity decreases rapidly and the deformation is small and the ductility The reusable coarse aggregate substitution rate had little effect on the bearing capacity of the specimens, but the ductility energy loss decreased with the increasing of the substitution rate. With the increase of the axial compression ratio, the bearing capacity of the specimens increased but the ductility energy The rate of decrease is large. With the increase of the volume fractional hoop ratio, the bearing capacity and ductility energy consumption of the specimens increase correspondingly. Except for the short column with small axial compression ratio, the ductility coefficients of the other steel reinforced concrete short columns are all less than 3, which shows that the short columns have poor seismic performance. Therefore, in practical engineering, corresponding measures should be taken to improve the short column seismic performance.