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为研究螺旋式或焊接式箍筋约束方柱的轴压性能,完成了2根配有绑扎复合箍和4根配有螺旋及焊接圆方组合箍的足尺混凝土方柱的轴心受压试验,测得了试件的极限承载力、轴向变形和箍筋应变,研究了不同箍筋组合形式对足尺混凝土方柱轴心受压承载能力及变形能力的影响,提出方形螺旋式或焊接式箍的间接钢筋面积换算公式.试验结果表明:螺旋焊接组合箍能一定程度提高足尺混凝土方柱的承载能力,但由于方箍肢距较大,试件后期变形能力与复合箍相比略有下降;轴向荷载作用下,配箍率相同的试件的极限承载力与其箍筋应力值的大小直接相关;高强箍筋可延缓试件承载力下降速率,显著提高试件的变形能力.
In order to study the axial compression performance of a square column constrained by a helical or welded stirrup, two axial compression tests of two square concrete columns with a lashing composite hoop and four helical and welded round square composite hoops were completed , The ultimate bearing capacity, axial deformation and stirrup strain of the specimens were measured. The effect of different stirrup combinations on the axial compressive loading capacity and deformation capacity of full-scale concrete square columns was studied. The square spiral or welded Hoop indirect reinforcement area conversion formula.The experimental results show that: spiral welded composite hoop to a certain extent, improve the bearing capacity of square concrete columns, but due to the larger side of the hoop, the specimen late deformation capacity compared with the composite hoop slightly The ultimate bearing capacity of specimens with the same stirrup ratio is directly related to the magnitude of the stirrup stress value. The high-strength stirrups can delay the rate of decline of the bearing capacity of specimens and significantly improve the deformation capacity of specimens.