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钢管混凝土复合柱由钢管混凝土柱肢和钢筋混凝土联接板组成。以柱肢钢管壁厚和联接板厚度为试验参数,对7个复合短柱试件进行轴压性能试验研究,同时进行了与复合柱试件组成相对应的4个钢管混凝土柱构件和3个钢筋混凝土板构件的轴压试验。研究复合短柱在轴压荷载作用下的破坏模式和荷载-位移曲线,对比分析试件与对应构件的荷载-应变曲线,研究柱肢钢管壁厚和联接板厚度对复合短柱轴压承载力的影响。试验结果表明:轴压复合短柱受力全过程分为弹性阶段、弹塑性阶段和塑性发展阶段;轴压复合短柱的破坏特征为钢筋混凝土联接板混凝土压碎,此时钢管混凝土柱肢的受力状态与对应的钢管混凝土构件的受力状态不同,钢管混凝土柱肢并没有充分发挥其自身的承载能力;在复合短柱的轴压承载力计算中应引入柱肢承载力折减系数,该系数与柱肢套箍系数相关;通过对现有的钢管混凝土轴压短柱的试验数据进行回归分析,拟合得到柱肢承载力折减系数的经验计算公式;按照建议方法计算得到的复合短柱的轴压承载力与试验结果吻合良好。
The concrete-filled steel tube column is composed of concrete-filled steel tubular columns and connecting plates of reinforced concrete. Taking the column wall thickness and the joint plate thickness as the experimental parameters, the axial compression properties of seven composite short column specimens were investigated, and four CFST columns corresponding to the composition of the composite column specimens and three Axial Compression Test of Reinforced Concrete Slabs. The failure modes and load-displacement curves of composite stub columns under axial compression were studied. The load-strain curves of specimens and corresponding members were compared and analyzed. The effects of column wall thickness and thickness on the axial compression bearing capacity Impact. The experimental results show that the whole process of axial compression composite short column is divided into elastic stage, elastoplastic stage and plastic development stage. The failure characteristic of the short axial compression column is the concrete crushing of reinforced concrete coupling plate. The stress state of the concrete-filled steel tubular members is different from that of the corresponding CFST members. The concrete-filled steel tube columns do not give full play to their bearing capacity. In the calculation of the axial compressive load capacity of composite short columns, The coefficient is related to the cuff coefficient of the column limbs. Through the regression analysis of the existing experimental data of concrete filled steel tubular short columns, the empirical formula for calculating the coefficient of reduction of the bearing capacity of the column limbs is obtained by fitting the experimental data. Based on the proposed method, The axial compression bearing capacity of the short column is in good agreement with the experimental results.