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为研究型钢再生混凝土短柱的抗震性能,对8个型钢再生混凝土短柱试件,采用悬臂柱式加载装置进行低周反复荷载试验,观察其受力过程和破坏形态。试验表明,剪跨比为1.4的型钢再生混凝土短柱以剪切斜压破坏形态为主;分别研究了轴压比、配箍率和再生粗骨料取代率对试件抗剪承载力的影响;分析了型钢再生混凝土短柱的受力特点和破坏机理;推导出型钢再生混凝土短柱发生剪切斜压破坏时的抗剪承载力计算公式。最后,为便于工程应用,在试验与理论分析的基础上,提出了型钢再生混凝土短柱抗剪承载力简化计算公式,计算结果与试验结果符合较好。
In order to study the seismic behavior of SRC columns, eight columns of recycled concrete short column specimens were subjected to low cycle repeated loading test with cantilever column loading device to observe the stress process and failure mode. The test results show that the short columns of steel reinforced concrete with shear ratio of 1.4 have the characteristics of shear baroclinic failure. The effects of axial compression ratio, stirrup ratio and recycled coarse aggregate substitution rate on the shear strength of specimens are studied respectively The mechanical characteristics and failure mechanism of SRC stub columns were analyzed. The formulas for calculating the shear strength of SRC stub columns under shear baroclinic failure were deduced. Finally, for the convenience of engineering application, based on experimental and theoretical analysis, a simplified formula for calculating the shear strength of SRC columns is proposed. The calculation results are in good agreement with the experimental results.