CN-224200140-U - Lightweight high-ductility steel-UHPC hollow combined tubular column

Abstract

The utility model provides a lightweight high-ductility steel-UHPC hollow combined pipe column which comprises a steel pipe, an ultra-high performance concrete layer, shear studs and core micro-expansion concrete. The inner side wall of the steel pipe is uniformly provided with shear studs, the ultra-high performance concrete layer is fixedly connected with the inner side wall of the steel pipe through the shear studs, a hollow structure is arranged in the ultra-high performance concrete layer, core micro-expansion concrete is filled at the upper end part and the lower end part of the hollow structure of the ultra-high performance concrete layer, and the single-end filling height is 1/6-1/3 of the total height of the steel pipe. According to the steel-UHPC hollow combined pipe column, the light weight is realized through the hollow section, meanwhile, the anti-seismic ductility is enhanced by filling concrete at the end part, and the shear stud can ensure that the steel pipe and the ultra-high performance concrete layer are stressed cooperatively, so that interface sliding is avoided. The utility model is suitable for the scenes of rail transit, large-span buildings and the like which need to be light and high in anti-seismic performance, and has the advantages of factory prefabrication, convenience in construction and the like.

Inventors

• Tao Dehuai
• SUN CHANGYU
• ZHENG XINLAN
• SHEN LEI
• PENG JUN
• BAO HUA
• WU KUI
• XIONG XUEWEI
• XIA TAO
• TANG BING
• SHEN YANG

Assignees

• 中铁第四勘察设计院集团有限公司

Dates

Publication Date

20260505

Application Date

20250605

Claims (10)

1. 1. The lightweight high-ductility steel-UHPC hollow combined pipe column is characterized by comprising a steel pipe (1), an ultra-high-performance concrete layer (2), shear pins (3) and core micro-expansion concrete (4); The inner side wall of the steel pipe (1) is uniformly provided with a plurality of shear studs (3); The ultra-high performance concrete layer (2) is fixedly connected with the inner side wall of the steel pipe (1) through shear studs (3), and a hollow structure is arranged in the ultra-high performance concrete layer (2); The core micro-expansion concrete (4) is filled in the upper end part (21) and the lower end part (22) of the hollow structure in the ultra-high performance concrete layer (2), and the single-end filling height is 1/6-1/3 of the total height of the steel pipe (1).
2. 2. The lightweight high-ductility steel-UHPC hollow combined tubular column according to claim 1, wherein the wall thickness of the steel tube (1) is more than or equal to 8mm, and the cross section of the steel tube is round or square.
3. 3. The lightweight high-ductility steel-UHPC hollow combined pipe column according to claim 1, wherein the thickness of the ultra-high-performance concrete layer (2) is 250-350mm, the cross section of a hollow structure in the ultra-high-performance concrete layer (2) is round or square, and the diameter or side length of the hollow structure is more than or equal to 500mm.
4. 4. The lightweight high ductility steel-UHPC hollow composite tubular column of claim 1, wherein the shear studs (3) have a length of 80-120mm, a spacing of 150-200mm in the transverse cross section of the steel pipe (1) and a spacing of 150-200mm in the longitudinal direction of the steel pipe (1).
5. 5. The lightweight high-ductility steel-UHPC hollow composite pipe column of claim 1, wherein the ultra-high performance concrete layer (2) is prepared from cement, silica fume, ground quartz sand, fine sand, metal fibers, a high efficiency water reducing agent and water.
6. 6. The lightweight high-ductility steel-UHPC hollow combined pipe column according to claim 5, wherein the volume percentage of the metal fiber in the ultra-high performance concrete layer (2) is 2-3%, the metal fiber is steel fiber, the length is 12-20mm, and the length-diameter ratio is 50-80.
7. 7. The lightweight high ductility steel-UHPC hollow composite pipe string of claim 1, wherein the core micro-expansive concrete (4) is made of plain concrete with an expansion agent added in a ratio of 35-45kg/m 3 .
8. 8. The lightweight high-ductility steel-UHPC hollow composite pipe column according to claim 1, wherein a gradual transition region (41) is arranged at the joint of the core micro-expansive concrete (4) and the hollow structure, and the included angle between the gradual transition region (41) and the ultra-high-performance concrete layer (2) is 30-60 degrees.
9. 9. The lightweight high-ductility steel-UHPC hollow composite pipe column according to claim 1, wherein the height of the steel pipe (1) is 5-12m, and the single-end filling height of the core micro-expansive concrete (4) is 0.8-3.5m.
10. 10. The lightweight high-ductility steel-UHPC hollow composite pipe column according to claim 1, wherein the steel pipe (1), the ultra-high-performance concrete layer (2) and the shear stud (3) of the steel-UHPC hollow composite pipe column are all transported to the site after being processed and prefabricated into a whole in a factory.

Description

Lightweight high-ductility steel-UHPC hollow combined tubular column Technical Field The utility model relates to the technical field of railway and rail transit engineering building structures and earthquake resistance, in particular to a lightweight high-ductility steel-UHPC hollow combined pipe column. Background In recent years, along with the rapid rise of high-speed rail traffic and urban rail traffic in China, more and more urban underground rail traffic, railway comprehensive transportation hubs and railway upper covers are generated, and the structure generally has the characteristics of large span, large load and complex structural system, and has structural conversion and inter-rail stand columns. The section size of the upright posts among the tracks is strictly controlled by railway limit, if the section size of the upright posts is too large, the line spacing is increased, and further the land scale and investment are increased, which is contrary to the principle of 'saving intensive, low carbon and green' of railway development in China. In order to meet the requirements of structural stress and railway limit, steel reinforced concrete or steel tube concrete columns are usually adopted, but the structural columns often have large axial compression ratio, and the excessive axial compression ratio can cause poor deformation capacity and ductility of the columns, so that the column ends are easy to be crushed and damaged by concrete brittle crush under the action of an earthquake to cause structural collapse. In addition, the existing combined column mostly adopts a full-section solid design, and the column is filled with common concrete, so that the solid design has a large section, wastes materials, contradicts the requirements of light weight and low carbon, and has the problems of low strength and poor toughness. The ultra-high performance concrete (UHPC for short) has high strength, high toughness and high durability, and is particularly suitable for large-span and heavy-duty structures. Currently, UHPC has been applied in some large span bridge structures and military projects. Based on the above, the steel-UHPC combined pipe column with light weight and high ductility is provided, so that the problems of poor toughness and low bearing capacity of the section of the traditional solid pipe column are solved, and the application requirements of the rail traffic engineering in a high-intensity area on the small section and the high ductility are met, so that the technical problem to be solved is needed. Disclosure of utility model The utility model aims to provide a lightweight high-ductility steel-UHPC hollow combined tubular column aiming at the defects of the prior art. The technical scheme is that the lightweight high-ductility steel-UHPC hollow combined pipe column comprises a steel pipe, an ultrahigh-performance concrete layer, shear-resistant studs and core micro-expansion concrete, wherein a plurality of shear-resistant studs are uniformly distributed on the inner side wall of the steel pipe, the ultrahigh-performance concrete layer is fixedly connected with the inner side wall of the steel pipe through the shear-resistant studs, a hollow structure is arranged in the ultrahigh-performance concrete layer, the core micro-expansion concrete is filled in the upper end part and the lower end part of the hollow structure in the ultrahigh-performance concrete layer, and the single-end filling height is 1/6-1/3 of the total height of the steel pipe. The steel-UHPC hollow combined pipe column provided by the utility model utilizes the characteristics of high strength, high toughness and high durability of ultra-high performance concrete (UHPC), and the ultra-high performance concrete is adopted to replace the traditional common concrete on the inner side wall of the steel pipe, so that the bearing capacity and toughness of the combined pipe column are improved. Meanwhile, according to the stress characteristics of the combined column under the earthquake action, a continuous hollow structure is arranged on the column shaft section of the ultra-high performance concrete layer, core micro-expansion concrete is filled at the upper end position and the lower end position of the combined column, which are easy to damage, so that the rigidity of the end part is effectively increased, the earthquake action damage is reduced, and the earthquake resistance toughness of the structural column is greatly improved. The single-end filling height of the core micro-expansion concrete on the combined column is 1/6-1/3 of the total height of the steel pipe, so that column damage in a node core area under the action of an earthquake can be avoided, and the design principle of 'strong-node weak members' is met. On the basis of the technical scheme, the wall thickness of the steel pipe is more than or equal to 8mm, and the cross section of the steel pipe is round or square. On the basis of the technical scheme, th