Axial Compressive Test and Capacity Model of Seawater and Sea-sand Concrete Columns Confined by Double-Layered Stainless Steel Tube
The axial compression behavior,failure mode,and axial compression capacity model of seawater and sea-sand concrete columns confined by double-layered stainless steel tube(DSTSCC)are studied to provide experimental and theoretical basis for evaluating the axial compression behavior of such components.24 DSTSCC specimens were subjected to axial compression tests,considering the influence of parameters such as outer tube thickness,core tube thickness,and core tube diameter on their failure mode,stress-strain curve and axial compression capacity.The test results indicate that:The main failure mode of the DSTSCC specimen is waist drum-shaped failure;As there is no obvious yield terrace in the tensile constitutive model of stainless steel,it can continuously restrain the core concrete,and the stress-strain curve of the specimen has no obvious descending part,showing good ductility characteristics;As the thickness of the outer tube increases,the axial compression capacity can be increased by 6％to 25％,and as the thickness of the core tube increases,the axial compression capacity can be increased by 3％to 20％;As the diameter of the core tube increases,the axial compression capacity shows a trend of first increasing and then decreasing;Based on the analysis of experimental failure mechanism and theoretical analysis,a formula for calculating the axial compression capacity of DSTSCC specimens was established.The validation results of experimental data show that the proposed formula has better applicability compared to other calculation models.
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