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共进行了9根无明显屈服台阶的钢管混凝土短柱和2根有明显屈服台阶的钢管混凝土短柱的轴压试验,对两者的破坏形态、极限承载力、荷载—应变曲线及荷载—组合材料的泊松比曲线等进行了研究和分析,研究结果表明前者破坏的形态具有剪切破坏的特征,且有一定的延性破坏特征。若定义无明显屈服台阶钢材拉应变达到2000με时对应的应力为名义屈服应力,应用已有的钢管混凝土轴压短柱承载力计算公式,所得的计算值与实际值吻合较好。
A total of nine specimens of concrete-filled steel tubular short columns with no obvious yielding steps and two concrete-filled steel tubular short columns with obvious yielding steps were investigated. The failure modes, ultimate bearing capacity, load-strain curve and load- Poisson’s ratio curves of the materials are studied and analyzed. The results show that the former destruction has the characteristics of shear failure and some ductile failure characteristics. If the definition does not significantly yield step steel tensile strain reaches 2000με when the corresponding stress nominal yield stress, the application of existing concrete filled steel tubular short columns bearing capacity formula, the calculated value and the actual value of good agreement.