Ten circular steel tube confined reinforced self-stressing steel slag concrete columns and four circular steel tube confined reinforced steel slag concrete columns are tested under low cyclic loading.The effects of axial compression ratio,shear-span ratio,diameter-thickness ratio and expansion rate on moment-curvature skeleton curve of the specimens are analyzed.Test results show that the failure modes of the specimens are flexural buckling,and as the axial compression ratio and the diameter-thickness ratio increase,or the shear span ratio decreases,the flexural bearing capacity of the specimen increase but the section curvature decrease.The slope of the rising section of the bending moment-curvature skeleton curve of the specimen increases.As the increase of the expansion rate of steel slag concrete,the flexural capacities and section curvature of the specimens are increased,and the slope of ascending section of moment-curvature skeleton curve increases.Based on the experimental study and the constitutive relation of the specimens,the nonlinear finite element program is compiled by using MATLAB software.The effects of core concrete strength,axial compression ratio,shear span ratio,diameter thick,initial self-stress of core concrete and width of reserved gap of steel tube on moment-curvature skeleton curve of the specimens are further discussed through parameter analysis.The results indicate that the calculated value of the moment-curvature skeleton curve of circular steel tube confined reinforced self-stressing steel slag concrete column is in good agreement with the experimental value.The influences of the axial compression ratio,shear span ratio and diameter-thickness ratio on moment curvature skeleton curve are basically consistent with the experimental results,and as the strength of core concrete and initial self stress of core concrete increase,the flexural capacities of the specimen is increased.As the strength of core concrete increase,the section curvature of the specimen is decreased.
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