To study the effects of the replacement rate of recycled coarse aggregate(RCA)and eccentrici-ty on the mechanical properties of recycled aggregate concrete with ferronickel slag filled circular steel tube columns,13 specimens were designed for axial and eccentric compression tests,and load-mid-span deflection curve,lateral deflection curve,stiffness degradation and energy dissipation were analyzed.Based on the research results of ordinary concrete filled steel tube(CFST)column,the prediction formula for the compression-bending capacity of recycled CFST is regressed.Results show that the deflection shape of the biased specimen conforms to the sinusoidal half wave curve.The position of the neutral axis of the cross section deviates to the compression zone during loading.When the replacement rate exceeds 30％,with the increase of RCA replacement rate,the ultimate bearing capacity of the specimen decreases,the stiffness degrades more,and the energy dissipation coefficient of the specimen decreases.With the increase of ec-centricity,the ultimate bearing capacity of the specimen decreases,the envelops area of the lateral deflec-tion curve increases gradually,and the stiffness degenerates more.The values calculated by the fitting for-mulas are in good agreement with the experimental results.
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