Abstract
To investigate the axial compressive behavior of marine concrete-filled stainless steel tubular (MCFST) columns with built- in carbon steel, a total of 10 specimens were tested under axial loads. The mechanical failure process and morphology of the specimens were observed, and the axial load-displacement curve and the strain curve of each steel were obtained. Based on the test data, the influence of various variation parameters on the ultimate bearing capacity, axial ductility, energy dissipation capacity and damage development of kinds of specimen was analyzed. The three-dimensional nonlinear finite-element (FE) models were established and verified with the experimental results. The test results indicated that the failure modes of specimens are local buckling and wrinkle of stainless steel tube and oblique shear failure of concrete. The built-in carbon steel can improve the ultimate bearing capacity, axial ductility and energy dissipation capacity of the specimen, and inhibit the damage development of the specimen. Under the condition of increasing the unit carbon steel ratio, MCFST column with built-in circular steel tube achieved the axial compression performance best. Considering the positive effect of the constraints of built-in carbon steel, the calculation methods of bearing capacity were proposed, and the calculated value reflected the measured data well.
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