CN-119332877-B - High-strength high-ductility steel tube concrete column

Abstract

The application provides a high-strength high-ductility steel tube concrete column which comprises a rectangular outer steel tube and arc-shaped inner steel plates connected to each steel tube surface on the inner side of the rectangular outer steel tube, wherein the arc-shaped inner steel plates and the steel tube surfaces on the inner side of the rectangular outer steel tube form four closed and mutually-disjoint cavities, the outer side of the inner cavity of the rectangular outer steel tube is a core area, concrete is filled in the core area, the arc-shaped inner steel plates provide restraint on a concrete column core by a similar round steel tube, so that concrete in all areas inside the outer steel tube can be well restrained, meanwhile, the arc-shaped inner steel plates provide supporting effect for the outer steel tube, local buckling deformation of the rectangular outer steel tube is effectively delayed, and a steel tube concrete column component has high strength and good ductility.

Inventors

• CHEN DEMING
• LI SHUAI
• YANG HUA
• LIU FAQI

Assignees

• 香港理工大学
• 哈尔滨工业大学

Dates

Publication Date

20260508

Application Date

20230719

Claims (10)

1. 1. The utility model provides a steel core concrete column of high strength high ductility, its characterized in that includes the outer steel pipe of rectangle and welds the steel sheet in the arc of every steel pipe face of the outer steel pipe inboard of rectangle, the steel sheet in the arc with the steel pipe face of the outer steel pipe inboard of rectangle forms four confined and each other disjoint cavitys through the welding, just the arc of steel sheet in the arc coincides in the interface of the invalid constraint zone of the outer steel pipe of rectangle and effective constraint zone, is the core area outside the outer steel pipe inner chamber of rectangle, and the core area fills concrete.
2. 2. A high strength high ductility concrete-filled steel tube column according to claim 1, wherein said arcuate inner steel sheet is a semicircular inner steel sheet.
3. 3. A high strength high ductility concrete-filled steel tube column according to claim 1, wherein said arcuate inner steel sheet is a semi-elliptical inner steel sheet.
4. 4. A high strength, high ductility steel tubular concrete column according to claim 1, wherein the cavity is filled with concrete.
5. 5. A high strength, high ductility steel tubular concrete column according to claim 4, wherein said cavity is filled with concrete of the same strength as the core region.
6. 6. A high strength, high ductility steel tubular concrete column according to claim 4, wherein said cavity is filled with a different strength concrete than the core region.
7. 7. A high strength, high ductility steel tubular concrete column according to claim 4 or 6, wherein said cavity is filled with high strength concrete and the core region is filled with normal strength concrete.
8. 8. The high strength high ductility steel core concrete column of claim 1, wherein said rectangular outer steel core and said arcuate inner steel sheet are comprised of high strength steel.
9. 9. A method of constructing a high strength high ductility concrete-filled steel tubular column according to any one of claims 1 to 8, comprising: Welding the arc-shaped inner steel plate to a steel plate with an arc-shaped end part; Welding the steel sheet welded with the arc-shaped inner steel plate through the arc-shaped end part to form a rectangular outer steel pipe, wherein the arc-shaped inner steel plate is positioned at the inner side of the rectangular outer steel pipe, four closed and mutually-disjoint cavities are formed on the steel pipe surfaces at the inner side of the rectangular outer steel pipe, and the outside of the cavity in the rectangular outer steel pipe is a core area; and pouring concrete in the core area.
10. 10. The construction method according to claim 9, characterized in that the construction method further comprises: And filling concrete in the cavity.

Description

High-strength high-ductility steel tube concrete column Technical Field The invention belongs to the field of building construction, and particularly relates to a high-strength high-ductility steel tube concrete column. Background The steel-concrete combined member system is widely applied to modern engineering construction, wherein a steel concrete Column (CFST) is widely used due to superior structural performance, and the use of a temporary mold during concrete pouring is omitted, so that the construction period is shortened and the labor cost is saved. The outer steel tube in the steel tube concrete column delays the transverse expansion and damage of the concrete column core, and meanwhile the concrete column core can effectively prevent the outer steel tube from buckling inwards. Round steel pipe concrete and square steel pipe concrete are currently the two most common cross-sectional forms. The round steel pipe can provide good constraint effect for the concrete column core, but an external annular plate is usually required to be arranged when the beam column connection is carried out due to the existence of an external curved surface of the round steel pipe. In contrast, square steel pipes are used more widely in construction because of the ease with which the external flat surfaces thereof can be connected to the components. But simultaneously, the constraint effect of the square steel tube on the concrete column core is not as good as that of a round steel tube, and local buckling damage is more likely to occur. When high-strength steel and high-strength concrete are used, the problems of poor constraint effect and local buckling of the square steel tube are more remarkable, the ductility of the combined column is greatly reduced, and the application of the high-strength square steel tube concrete column is hindered. In order to improve the structural performance of the square steel tube concrete column, various design modes exist in the prior art, such as welding stiffening ribs in the steel tube, restraining the concrete column core by stirrups, sleeving round steel tubes in the square steel tube and the like, but the problems of local buckling deformation and restraining effect improvement cannot be solved by the methods at the same time, the construction workload is increased, and the construction period is prolonged. Therefore, the research and development of the novel high-strength high-ductility square steel tube concrete column has important engineering practice significance and social and economic values. Disclosure of Invention Based on the above, the invention provides a high-strength high-ductility concrete filled steel tube column, which overcomes various defects of square concrete filled steel tube column components in the prior art. The invention relates to a high-strength high-ductility steel tube concrete column which comprises a rectangular outer steel tube and arc-shaped inner steel plates connected to each steel tube surface on the inner side of the rectangular outer steel tube, wherein the arc-shaped inner steel plates and the steel tube surfaces on the inner side of the rectangular outer steel tube form four closed and mutually-disjoint cavities, the outside of the inner cavity of the rectangular outer steel tube is a core area, and the core area is filled with concrete. Optionally, the arc-shaped inner steel plate is a semicircular inner steel plate. Optionally, the arc-shaped inner steel plate is a semi-elliptical inner steel plate. Optionally, the arcuate surface of the arcuate inner steel sheet coincides with the interface of the non-effective constraining region and the effective constraining region of the rectangular outer steel tube. Optionally, the cavity formed in the rectangular outer steel tube is filled with concrete. Optionally, the cavity is filled with concrete of the same strength as the core area. Optionally, the cavity is filled with concrete of a different strength than the core area. Optionally, the cavity is filled with high-strength concrete, and the core area is filled with common-strength concrete. Alternatively, the rectangular outer steel tube and the arc-shaped inner steel plate are made of high-strength steel. On the other hand, the invention also provides a construction method of the concrete filled steel tubular column, which comprises the following steps: welding the arc-shaped inner steel plate to a steel plate with an arc-shaped end part; Welding the steel sheet welded with the arc-shaped inner steel plate through the arc-shaped end part to form a rectangular outer steel pipe, wherein the arc-shaped inner steel plate is positioned at the inner side of the rectangular outer steel pipe, four closed and mutually-disjoint cavities are formed on the steel pipe surfaces at the inner side of the rectangular outer steel pipe, and the outside of the cavity in the rectangular outer steel pipe is a core area; and filling the core area with concrete. Opti