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通过16个薄壁方钢管再生混合短柱的轴压试验,研究废弃混凝土取代率、新旧混凝土强度差、钢管壁厚等因素对试件轴压性能的影响;基于新、旧混凝土的组合强度,对比分析国内外相关公式预测试件轴压承载力的有效性。研究结果表明:与全现浇薄壁方钢管混凝土短柱相比,薄壁方钢管再生混合短柱的钢管屈服较早,废弃混凝土取代率越大钢管屈服越早;薄壁方钢管再生混合短柱的轴压承载力总体呈现出随废弃混凝土取代率增加逐渐降低的趋势,降低幅度大于薄壁圆钢管再生混合短柱;当新、旧混凝土抗压强度相近时,取代率在20%～33%范围内变化对薄壁方钢管再生混合短柱的轴压承载力影响有限;为使再生混合短柱具有与全现浇短柱相近的安全性,建议对根据现行设计标准计算得到的薄壁方钢管再生混合短柱的轴压承载力乘以调整系数0.9。
Based on the axial compression tests of 16 thin-walled square steel tube hybrid stub columns, the effects of the replacement ratio of waste concrete, the difference of new and old concrete strength and the wall thickness of steel tube on the axial compressive properties of the specimens were studied. Based on the combined strength of new and old concrete, Effectiveness of Prediction of Axial Bearing Capacity of Test Species by Correlation Formulas at Home and Abroad. The results show that compared with short cast-in-situ concrete-filled square steel tube short columns, the yield of steel tube with short-walled square steel tube mixed short stub columns is earlier and the yield of abandoned concrete is higher, Overall, the replacement ratio of waste concrete gradually decreases with the reduction rate being larger than that of thin-walled rectangular steel tube. When the compressive strength of new and old concrete is similar, the substitution rate varies from 20% to 33% It is suggested that the axial compression bearing capacity of thin-walled square steel tube mixed short columns calculated according to the current design standards is multiplied by To adjust the coefficient of 0.9.