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设计了16根方钢管混凝土短柱试件,对不同截面尺寸、核心混凝土骨料类型、酸雨腐蚀率的试件进行轴压试验,并对酸雨环境下不同腐蚀程度的方钢管再生混凝土轴压短柱的延性、荷载-纵向应变、组合弹性模量、损伤分析以及承载力验算进行了分析。试验结果表明:酸雨环境下方钢管普通混凝土短柱和方钢管再生混凝土短柱有相似的破坏形态。随着腐蚀程度的加深,方钢管普通混凝土轴压短柱和方钢管再生混凝土轴压短柱后期延性变差,腐蚀程度越深,后期延性下降越大,组合弹性模量下降越明显,试件损伤越严重,承载力下降越大。酸雨环境下的钢管混凝土构件可近似看作均匀腐蚀,采用折减壁厚的方法对钢管混凝土短柱承载力进行验算,结果与试验数据吻合度高。
Sixteen concrete-filled square steel tubular short columns were designed and their axial compression tests were carried out on specimens with different cross-sectional dimensions, types of core concrete aggregate and acid rain rate. The axial compressive strengths of square steel tubular recycled concrete with different degrees of corrosion under acid rain Column ductility, load - longitudinal strain, combined elastic modulus, damage analysis and checking of bearing capacity were analyzed. The experimental results show that the concrete columns with square steel tube and the concrete filled square steel tube have similar failure modes in the acid rain environment. With the deepening of the corrosion, the post ductility of the square steel tubular plain stub columns and the square steel tubular reclaimed concrete columns shorten the post-ductility, the deeper the degree of corrosion, the greater the decline of late ductility, the more obvious drop of combined elastic modulus, the specimen Damage is more serious, the greater the decline in bearing capacity. The concrete-filled steel tubular members in acid rain environment can be regarded as uniform corrosion, and the bearing capacity of CFST short columns is checked by the method of reducing wall thickness. The results are in good agreement with the experimental data.