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通过轴压试验研究了不同再生混凝土掺入量的小径厚比钢管再生混凝土短柱在荷载作用下的宏观变形特征、荷载-应变关系和破坏机理,分析了代表目前钢管混凝土三种理论的计算公式的适用性。研究结果表明,取代率对钢管再生混凝土短柱破坏形态影响较小,但对极限承载力影响较大,极限承载力随着取代率的增加而下降,最大降幅约为13%。再生混凝土取代率较高时,目前三种理论计算公式计算结果偏于不安全,从收缩率角度对英国标准协会BS 5400计算公式进行修正,其计算结果与钢管普通混凝土试件计算结果具有相同的安全度。
Through the axial compression test, the macro-deformation, load-strain relationship and failure mechanism of different reclaimed concrete with small diameter-thickness ratio of reclaimed concrete filled steel tubular short columns under load are studied. The formulas that represent the current three kinds of concrete-filled steel tube Applicability. The results show that the substitution rate has little effect on the failure morphology of concrete filled steel tubular short columns, but it has a great effect on the ultimate bearing capacity. The ultimate bearing capacity decreases with the increase of the substitution rate, and the maximum decrease is about 13%. At present, when the replacement rate of recycled concrete is high, the calculation results of the three theoretical formulas are unsafe. The formula of BS 5400 is corrected from the viewpoint of shrinkage rate. The calculation results are the same as those of ordinary concrete specimens Safety.