Abstract
To investigate the effect of constructional measures (including horizontal and vertical stiffeners, rebar cages, embedded steel tubes, and cavity welded steel plates) under high axial load ratios on the seismic performance of concrete-filled steel tubular (CFST) columns, quasi-static tests for six large-scale CFST columns with various constructional measures are performed. All specimens are subjected to identical axial forces. The failure mode, hysteresis characteristics, bearing capacity, stiffness degradation, ductility, and energy dissipation of specimens are analyzed. The study shows that the horizontal stiffener delays the occurrence and severity of column base buckling, the vertical stiffener improves the bending resistance capacity and initial stiffness of the member, the rebar cage improves the ductility, and the embedded circular steel tube significantly improves the member’s bearing capacity, ductility, and energy dissipation. When an internal circular steel tube and cavity welded steel plate are applied in tandem, the section steel ratio increases by 4.42% and the bearing capacity improves by 42.72%. A finite element model is created to verify test results, and simulation results match the test results well.
Highlights
Concrete-filled steel tubular (CFST) structures have advantages, including its high bearing capacity, excellent ductility, and superior fireproof properties, compared to steel structures, and it has been widely deployed in high-rise and super high-rise buildings
Amir Fam [8] performed seismic performance tests for five circular CFST beam-column specimens with diameters of 152 mm; the axial load ratio was 0.25, and the study focused on the effects of steel tube and concrete bonding strength on the seismic performance of CFST columns
Quasi-static tests are performed for six circular CFST column specimens
Summary
Concrete-filled steel tubular (CFST) structures have advantages, including its high bearing capacity, excellent ductility, and superior fireproof properties, compared to steel structures, and it has been widely deployed in high-rise and super high-rise buildings. Amir Fam [8] performed seismic performance tests for five circular CFST beam-column specimens with diameters of 152 mm; the axial load ratio was 0.25, and the study focused on the effects of steel tube and concrete bonding strength on the seismic performance of CFST columns. (3) Experimental studies on the seismic performance of CFST columns under high axial load ratios are scarce To address these problems, in this paper, based on mega framework circular CFST columns in super high-rise buildings, six large-scale circular CFST column specimens with various cavity constructional measures are designed and prepared. Quasi-static tests under high axial load ratios are performed to investigate the failure mode, bearing capacity, hysteresis characteristics, stiffness degradation, ductility, and energy dissipation of each specimen. The effects of various constructional measures on the seismic performance of CFST columns are compared, which provides reference for an actual project
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