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进行了20个方钢管约束钢筋混凝土短柱的轴压力学性能试验研究,试验的主要参数为钢管宽厚比(50,70和100)和混凝土强度(C50,C80)。试验结果表明:方钢管约束钢筋混凝土柱中被分隔钢管的高度对其轴压承载力和延性无明显影响。随钢管宽厚比增大和混凝土强度的提高,轴压短柱的延性降低。采用弹塑性应力分析方法对钢管进行了全过程应力分析,分析结果表明,方钢管约束钢筋混凝土轴压短柱的峰值荷载点并不对应钢管的屈服点,钢管在轴压短柱达到峰值荷载后屈服。根据试验结果和钢管的应力分析结果,建立了方钢管约束钢筋混凝土短柱的轴压承载力计算式,试验结果与计算结果吻合良好。并提出了设计建议。
The axial compressive mechanical properties of 20 square steel tube confined reinforced concrete short columns were studied. The main parameters of the experiment were steel pipe width to thickness ratio (50, 70 and 100) and concrete strength (C50, C80). The experimental results show that the height of the separated steel pipe confined by square steel tube has no obvious effect on the bearing capacity and ductility of the RC column. As ductility ratio of steel increases and the strength of concrete increases, the ductility of short stub columns decreases. The stress analysis of the whole process of the steel tube was carried out by using the elastoplastic stress analysis method. The results show that the peak load point of the square steel tube constrained reinforced concrete axial compression short column does not correspond to the yield point of the steel tube. After the steel tube reaches the peak load yield. According to the test results and the stress analysis results of the steel pipe, the formulas for calculating the axial compressive bearing capacity of square steel tube confined reinforced concrete short columns are established. The experimental results are in good agreement with the calculated results. And put forward the design proposal.