Experimental investigation on the seismic behavior of self‐stressing steel slag CFST column

Abstract

AbstractTo fully use the expansion property of steel slag, an experiment on 10 self‐stressing steel slag concrete‐filled steel tube (SSSCFST) columns and four steel slag concrete‐filled steel tube (SSCFST) columns subjected to low cyclic loading are implemented, the effects of the expansion ratio of the steel slag concrete, axial compression ratio, diameter‐thickness ratio, and shear span ratio on the seismic properties of SSSCFST components are analyzed. The outcomes present that the failure mode of specimens changes from bending failure to bending‐shear failure as the shear span ratio reduces. With the improvement of the axial compression ratio, the initial stiffness, strength degradation degree, and the growth rate of energy dissipation capacity increase, while the ductility decreases. With the decrease in diameter‐thickness ratio, there is no significant change in other seismic performance except for the increase in initial stiffness. Compared with the SSCFST columns, the seismic performance indexes of SSSCFST columns are advanced. The study on the seismic behavior of SSSCFST columns can provide the basis for engineering application.