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对10个矩形钢管混凝土中短柱试件进行弯-剪性能试验研究,考察跨高比、轴压比对其破坏模式、破坏界限、承载力的影响。试验结果表明:对两端作用等值反向弯矩的试件,跨高比为1时发生剪切破坏,跨高比为2时发生剪-弯破坏,跨高比为3时发生弯-剪破坏,跨高比不小于4则发生弯曲破坏;轴压比小于0.36时不会改变试件的破坏模式,但对承载力有一定影响;弯曲、弯-剪破坏的试件钢管翼缘出现鼓曲或拉裂,剪切、剪-弯破坏的试件出现斜压杆效应。基于斜压杆机制提出矩形钢管混凝土中短柱构件受剪承载力计算式,计算结果与试验实测值吻合良好。
The ten specimens of rectangular concrete-filled steel tube (CFST) were tested on the bending-shear behavior. The effects of the ratio of span to height and axial compression ratio on the failure mode, failure limit and bearing capacity were investigated. The test results show that the specimens with opposite bending moments at both ends shear failure when the ratio of span to height is 1, shear-bend failure occurs when the ratio of span to height is 2, When the axial compression ratio is less than 0.36, the failure mode of the specimen will not be changed, but the bearing capacity will be affected to a certain extent. The bending, bending-shear failure of the specimen steel pipe flange appears Drum or pull crack, shear, shear - bending damage specimens appear baroclinic effect. Based on the system of bar cams, the formula of the shear capacity of the short columns in concrete - filled rectangular steel tubes is proposed. The calculated results are in good agreement with the experimental ones.