An experimental program that investigated the seismic performance of concrete-filled square steel tube with fiber-reinforced
polymer (FRP)–confined concrete core (FCCC) column (SCFC) was conducted. Fourteen SCFC specimens were fabricated with four
parameters of axial compression ratio, strength grade of concrete, thickness of FRP tube, and thickness of steel tube and tested under constant
axial compression and reversed-cyclic lateral loading. Examinations of the test data resulted a number of significant conclusions with
regard to the influence of the investigated column parameters on the performance of SCFC columns. Of primary importance, SCFC columns
exhibit favorable energy dissipation and ductility, even when the columns were subjected to high axial loads. The results also indicate that
SCFC columns delivered satisfactory lateral moment-bearing capacity and displacement ductility under high axial compression ratio.
In addition, a good level of average stiffness and equivalent viscous damping ratio were examined. Furthermore, the variations of hoop
strains along column height, the relationship of axial displacement–lateral drift ratio, and the plastic hinge length were examined to
evaluate the seismic performance of SCFC columns.