Seismic performance of reinforced self-compacting concrete-filled circular steel-tube columns

Reinforced self-compacting concrete-filled circular steel-tube (RSCCFST) columns are used globally. The aim of this paper was to analyze the seismic performance of RSCCFST columns. One self-compacting concrete-filled circular steel-tube (SCCFST) column and seven RSCCFST columns were subjected to a low-frequency cyclic load. The experimental results indicated that the hysteretic curves of the RSCCFST columns were plump, and the columns exhibited good seismic performance. Parametric studies were also conducted to reveal the effects of the axial compression ratio, steel tube thickness, and the longitudinal reinforcement ratio on the seismic behavior of the RSCCFST columns. The parameter analysis indicates that increasing the reinforcement ratio and steel tube thickness can improve the load capacity and ductility of RSCCFST columns. Based on the above analysis, the entire process analysis method for RSCCFST columns under low-frequency cyclic loads was proposed using the Fortran language. The calculated results showed high accuracy compared to the experimental results; the average value of the ratio between the calculated and experimental values was 0.942, with a mean square error of 0.034. This proves that the computing programs written in Fortran are efficient for analyzing RSCCFST columns.