In structures of earthquake-prone zones, round-ended concrete-filled steel tubular (RCFST) columns have been utilised. Hysteretic testing on 12 RCFST columns was conducted to investigate the effects of the axial load ratio and height-width ratio on their seismic behaviour. The test results showed that compared to concrete-filled rectangular steel tubular (CFRST) columns, RCFST columns experienced more moderate damage while possessing a plumper cyclic curve with larger ductility, deformation capacities, and energy dissipation capabilities. The strength, stiffness, and energy dissipation capabilities of RCFSTs all increased with the increase of height-width ratio, but the ductility decrease with the increase of the ratio. By contrast, the height-width ratio has a negligible effect on the equivalent damping coefficient and the rate of stiffness degradation. Finite element (FE) models were developed for the tested RCFST columns, and the FE envelope curves are in good agreement with the test results. Based on the FE model, a parametric study of the envelope curve of RCFST columns was carried out. The main parameters included the material strength, steel ratio, slenderness ratio, axial load ratio and height-width ratio. According to the parametric study, the increase of height-to-width ratio leads to an increase in strength and stiffness but a decrease of ductility.When the yield strength of the steel increases from 235 MPa to 700 MPa, the bearing capacity increases by 89.1%. As the steel ratio is enhanced from 0.05 to 0.2, the bearing capacity increase by 146%. When the slenderness ratio is improved from 20 to 100, the bearing capacity decreases by 88.3%. As the axial compression ratio is changed from 0.01 to 0.8, the bearing capacity is reduced by 61.2%. When the height-to-width ratio is increased from 1 to 3, the bearing capacity increases 215.3%.Based on the restoring force model of concrete-filled circular steel tubular columns, a restoring force model of the RCFST columns was proposed. The predicted results using the restoring force model were in good agreement with the test results,with an error less than 10%.
Key words
concrete-filled steel tube /
round-ended section /
hysteretic test /
ductility /
energy dissipation /
finite element analysis /
restoring force model
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