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通过4个1/8比例试件的低周反复加载试验,研究轴压比、壁径比与配筋率对大尺寸薄壁钢筋混凝土管柱抗震性能的影响。分析了试件的滞回曲线、骨架曲线及其特征点、位移延性以及破坏模式。按照现行混凝土结构设计规范计算了试件的弯曲承载力,试验结果大于计算结果。建议了配置双排纵筋钢筋混凝土管柱的抗弯承载力计算公式。采用ANSYS进行有限元计算,计算结果与试验结果基本吻合。研究表明:弯曲破坏是大尺寸薄壁钢筋混凝土管柱的主要破坏模式,轴压比是影响其延性的主要因素。
The influence of axial compression ratio, wall diameter ratio and reinforcement ratio on the seismic behavior of large-size thin-walled reinforced concrete columns was investigated by low cycle loading test of four 1/8 specimens. Hysteresis curves, skeleton curves and their characteristic points, displacement ductility and failure modes of the specimens were analyzed. According to the current design code of concrete structure, the bending capacity of the specimen is calculated, and the test result is larger than the calculated result. The formula for calculating the flexural capacity of double-row longitudinal reinforced concrete columns is proposed. ANSYS finite element calculation, the calculation results and experimental results are basically consistent. The results show that bending failure is the main failure mode of large-size thin-walled reinforced concrete columns. The axial compression ratio is the main factor affecting the ductility.