Seismic steel tubular column with internal local restraint and filled with high-strength compound concrete containing normal-strength demolished concrete lumps and construction process of such column

A seismic steel tubular column with internal local restraint and filled with high-strength compound concrete containing demolished concrete lumps, comprising:

• a steel tube;
• horizontal stirrups, wherein the horizontal stirrups are arranged at upper and lower ends inside the steel tube, with the steel tube having a circular or polygonal cross section, and the horizontal stirrups corresponding to the circular cross section are uniformly arranged and more concentrated in one-seventh of a height range from the lower end of the steel tube and in one-seventh of a height range from the upper end of the steel tube respectively than other areas of the steel tube, while the horizontal stirrups corresponding to the polygonal cross section are uniformly arranged and more concentrated in one-fifth of a height range from the lower end of the steel tube and in one-fifth of a height range from the upper end of the steel tube respectively than other areas of the steel tube;
• and
• high-strength fresh concrete, wherein the high-strength fresh concrete and the demolished concrete lumps are mixed and arranged inside the steel tube, with a compressive strength of the high-strength fresh concrete being 30-90 MPa greater than a compressive strength of the demolished concrete lumps,
• wherein the height range is the distance between the lower end of the steel tube and the upper end of the steel tube.