Abstract:In order to analyze the factors affecting the bearing performance of recycled concrete-filled steel tubular short columns, three square hollow sandwich recycled concrete-filled steel tubular short columns with different eccentricities were designed for monotonic loading to verify the applicability of the established finite element model; Using the verified finite element model, seven specimens of recycled concrete-filled steel tubular short columns with three section types (square sleeve, square hollow section, square sleeve circular hollow section and square solid section) are designed.Taking eccentricity and outer steel tube wall thickness as variable parameters, the finite element analysis model was established by using ABAQUS finite element software for static loading analysis. The load axial displacement curves of recycled concrete filled steel tubular columns with different eccentricities and external steel tube wall thickness were obtained, and the influence of eccentricities and external steel tube wall thickness on the bearing capacity of recycled concrete filled steel tubular short columns was analyzed. The results show that the bearing capacity of three types of recycled concrete short columns with hollow intercalation of square steel tube increases with the decrease of eccentricity or the increase of wall thickness of outer steel tube; Among the three cross-section types, the square hollow sandwich specimen has the highest initial stiffness and ultimate bearing capacity.