Long-term mechanical properties test for 864 days were completed on three types column, including plain concrete(PC), reinforced concrete(RC) and concrete-filled steel tube(CFST) columns, the creep performance and ultimate strength were tested and analyzed. Creep test results show that reinforcement can significantly reduce the creep deformation of concrete columns. The creep coefficient of steel pipe surface is larger than that of inner concrete for CFST columns, it would last a long time for the creep of inner concrete to achieve stability. The ultimate strength test results show that loadin...
