Prefabricated section steel UHPC-NC composite column

Abstract

The utility model relates to a prefabricated section steel UHPC-NC combination column which comprises ultra-high performance concrete, common concrete, H-shaped steel, longitudinal bars, stirrups and studs. The section steel concrete column is provided with an ultra-high performance concrete rectangular-ambulatory-plane column and a common concrete square column embedded with the H-shaped steel. The end part of the H-shaped steel is provided with a hook-shaped component, the middle part of a web plate is provided with a plurality of rows of holes and flanges, the web plate is welded with a plurality of rows of studs, and the common concrete square column is wrapped by an ultra-high performance concrete hollow square column which is internally provided with longitudinal bars and closed stirrups. Compared with the prior art, the structure is simple in construction, convenient to machine and construct, reasonable in design division, capable of fully utilizing resources, good in economic reliability, good in stress performance, large in rigidity and good in ductility, the problems of anti-seismic performance, stability and the like can be solved, and in addition, the fluidity of the internal structure is improved through the circular or regular polygon holes.

Description

Technical Field

[0001] The utility model relates to the technical field of structural engineering of high-rise buildings, industrial buildings and bridge structures, in particular to a prefabricated steel UHPC-NC composite column. Background Art

[0002] At present, the most common structures used in super high-rise buildings and large-span structures are steel structures, concrete structures and steel-concrete composite structures. Since the reform and opening up, economic construction has developed rapidly and the level of science and technology has been increasing. With the rise of a large number of construction projects, composite structures have been widely used in engineering construction as the fifth structural system after the traditional four major structures. Single concrete structures or steel structures cannot meet the requirements of mechanical performance. In addition, with the increasing diversity of engineering structural forms, the upper loads borne by columns have increased, the problem of axial compression ratio exceeding the limit has become increasingly prominent, the requirements for structural ductility levels in seismic design have increased, the demand for resistance in the face of accidental events such as natural disasters has increased, and the emphasis on structural durability has increased, making steel-concrete composite structures one of the more reasonable methods to solve the above contradictions.

[0003] Concrete structures have good plasticity, easy access to materials, and high economic benefits, but they have many processes and long construction periods, and are heavy and difficult to repair. Although steel structures have high strength, good toughness, low weight, good corrosion resistance, and good seismic performance, they have poor fire resistance, low economic benefits, poor corrosion resistance, and easy fracture at low temperatures. At this time, the steel-concrete composite structure can make full use of the advantages of both, and the overall working performance is significantly increased, which not only avoids the shortcomings of steel structures such as poor fire resistance and corrosion resistance and overall or local instability, but also avoids the shortcomings of concrete structures such as limited effective use space, poor seismic performance, and long construction period. The steel-concrete composite structure has the advantages of high strength, high stiffness, good seismic performance, and convenient construction.

[0004] Steel-concrete composite structures can generally be divided into steel-concrete composite structures, steel tube concrete structures, and steel-steel tube high-strength concrete composite structures. The steel cross-section of the steel-concrete column is H-shaped steel or cross-shaped steel. These two types of steel are buried in concrete to form a combination of steel and concrete, which is called a steel-concrete structure. There is a constraint between concrete and steel. On the one hand, because the steel is wrapped in concrete, the steel generally will not lose stability as a whole or buckle locally and is not easily corroded in the internal area. On the other hand, the steel constrains the core concrete, and the stiffness is greatly improved. Steel-concrete composite structures can be divided into steel-concrete structures with solid steel and steel-concrete structures with hollow steel. The steel-concrete structure with solid steel has the advantages of simple production, large bearing capacity, and good seismic performance, while the steel-concrete structure with hollow steel has the advantages of saving steel and good adhesion, but both have the disadvantages of on-site casting, long construction period, and high construction cost. In addition, there are disadvantages such as low bonding strength between steel sections and concrete, low tensile strength and high brittleness. At this time, a series of measures need to be taken to restrain the cracking of concrete and solve problems such as poor fluidity in concrete. Utility Model Content

[0005] The purpose of the utility model is to provide a prefabricated steel UHPC-NC composite column in order to overcome the defects of the prior art, so as to enhance the bonding strength between the steel and concrete, effectively improve the stress performance of ordinary concrete and the problems of easy cracking and poor fluidity.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A prefabricated steel UHPC-NC composite column comprises ultra-high performance concrete, ordinary concrete, H-shaped steel, longitudinal reinforcement, stirrups and studs. The steel concrete column is provided with an ultra-high performance concrete U-shaped column and an ordinary concrete square column with embedded H-shaped steel. The H-shaped steel is an H-shaped steel with a hook-shaped member at the end, a plurality of rows of holes in the middle of the web, and a plurality of rows of studs welded to the flange and the web. The ordinary concrete square column is wrapped by an ultra-high performance concrete U-shaped column with longitudinal reinforcement and closed stirrups inside.

[0008] The prefabricated steel UHPC-NC composite column is characterized in that the core area of ​​the steel concrete column is an ordinary concrete square column with embedded H-shaped steel, and the outer core area is an ultra-high performance concrete U-shaped column with longitudinal reinforcement and stirrups arranged inside.

[0009] The prefabricated steel UHPC-NC composite column is characterized in that the hook-shaped components at both ends of the upper flange of the H-shaped steel and the hook-shaped components at both ends of the lower flange are both rectangular.

[0010] The prefabricated steel UHPC-NC composite column is characterized in that the upper flange, the lower flange and the web of the H-shaped steel are all arranged with a plurality of rows of studs, and the studs are welded to the outer surfaces of the flanges and the web.

[0011] The prefabricated steel UHPC-NC composite column is characterized in that a plurality of rows of circular or regular polygonal holes with equal spacing and the same diameter are arranged in the middle of the H-shaped steel web.

[0012] The prefabricated steel UHPC-NC composite column is characterized in that the longitudinal reinforcement is evenly arranged along the four sides of the square column.

[0013] The prefabricated steel UHPC-NC composite column is characterized in that the closed stirrups are evenly arranged along the column height.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The steel used in the present invention is an H-shaped steel of solid web type, not a standard H-shaped steel. Instead, the bonding strength between the steel and concrete is enhanced by welding studs on the web, upper flange and lower flange and welding hook-shaped components made of the same material as the H-shaped steel on the upper and lower flanges.

[0016] (2) The circular or regular polygonal holes provided in the middle of the web of the H-shaped steel used in the present invention facilitate better flow of concrete between the ordinary concrete areas located on both sides of the steel, effectively improving the problem of poor fluidity in the concrete.

[0017] (3) The utility model is an effective combination of steel sections, longitudinal reinforcement and stirrups, which perfectly brings into play the restraining effect among steel sections, reinforcement and concrete, limiting the overall instability and local buckling of the steel sections, and improving the overall strength and stiffness. At the same time, the configuration relationship among the three is reasonably designed to maximize the utilization of resources.

[0018] (4) The utility model is an effective combination of ordinary concrete and ultra-high performance concrete. The ultra-high performance concrete square column with better performance is used to wrap the ordinary concrete square column with average performance, and then the H-shaped steel with welded hook-shaped components and bolts is wrapped, so as to protect the ordinary concrete square column to restrain concrete cracking, inhibit the development of concrete cracks and enhance the overall elastic-plastic properties of the steel-concrete column structure. In addition, the reasonable division of ordinary concrete and ultra-high performance concrete areas is a reasonable utilization of resources. Compared with UHPC columns, the construction cost is greatly reduced.

[0019] To sum up, the utility model is a manifestation of a steel-concrete composite structure, which overcomes the shortcomings of steel structures and concrete structures, combines the respective advantages of the two, rather than simply superimposing the performance of the two, greatly improves its strength, rigidity and ductility, significantly improves the seismic performance of the structure, reduces the cross-sectional size of the column, increases the utilization of the effective height, and can be used in engineering structures of super-high-rise, large spans and harsh environments, with significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the improved H-shaped steel structure of the utility model;

[0022] Figure 3 This is a schematic structural diagram of a common concrete square column with embedded H-shaped steel in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the ultra-high performance concrete U-shaped column of the utility model.

[0024] Description of the numbers in the figure:

[0025] 1. UHP concrete square column, 2. Ordinary concrete square column, 3. Hook-shaped member, 4. H-shaped steel, 5. Stirrups, 6. Longitudinal reinforcement, 7. Studs, 8. Circular or regular polygonal holes. DETAILED DESCRIPTION

[0026] The utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that this embodiment is implemented based on the structural schematic diagram of the utility model and the modern scientific and technological implementation plan. The implementation method description only involves some substantial examples in a relatively broad range, and does not involve the relevant data of specific cross-sectional dimensions and cross-sectional areas. The utility model does not limit the cross-sectional dimensions in order to be applicable to structures such as large-span structures and super-high-rise structures, so that it can be used in various buildings or structures and play different practical uses, but the protection scope of the utility model is not limited to this embodiment.

[0027] Example:

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a prefabricated steel UHPC-NC composite column includes ultra-high performance concrete, ordinary concrete, H-shaped steel 4, longitudinal reinforcement 6, stirrups 5 and studs 7. The steel concrete column is provided with an ultra-high performance concrete U-shaped column 1 and an ordinary concrete square column 2 with an embedded H-shaped steel 4. The H-shaped steel 4 is an H-shaped steel 4 with a hook-shaped component 3 at the end, a plurality of rows of holes 8 in the middle of the web, and a plurality of rows of studs 7 welded to the flange and the web. The ordinary concrete square column 2 is wrapped by an ultra-high performance concrete U-shaped column 1 with longitudinal reinforcement 6 and closed stirrups 5 inside.

[0029] Among them, the two ends of the upper flange and the lower flange of the H-shaped steel 4 are welded with a hook-shaped component 3 of the same material as the H-shaped steel 4 and in a rectangular shape. There are several rows of welded studs 7 on the upper flange, the lower flange and the web of the H-shaped steel 4. The hook-shaped component 3 and the stud 7 can be made by a mold, which can save a lot of manpower and time and improve economic benefits. The reason why the hook-shaped component 3 and the stud 7 need to be configured separately is that the surface of the H-shaped steel 4 is smooth, and the bonding strength between the steel and the concrete is small, which will have an adverse effect. The addition of the hook-shaped component 3 and the stud 7 significantly enhances the overall mechanical properties. Several rows of circular or regular polygonal holes 8 with equal spacing and the same diameter are set in the middle of the web of the H-shaped steel 4. This design is to enhance the fluidity inside the concrete or between two types of concrete.

[0030] The steel-concrete column is provided with an ultra-high performance concrete U-shaped column 1 and an ordinary concrete square column 2 with an embedded H-shaped steel 4. The U-shaped column is made of ultra-high performance concrete, while the square column with embedded H-shaped steel 4 is made of ordinary concrete. Ultra-high performance concrete can protect the ordinary concrete area in the square column area and the H-shaped steel 4 area. Ordinary concrete has the disadvantages of low tensile strength and high brittleness, and is easy to fall off the shell and produce cracks. The presence of ultra-high performance concrete delays the occurrence of cracks, reduces the degree of concrete damage, and enables the internal structure of the column to perform its corresponding functions to reach the expected level, thereby improving the durability of the steel-concrete column. The longitudinal reinforcement 6 is evenly arranged along the four sides of the square column, and the closed stirrups 5 are arranged along the height of the column. It has the advantages of easy configuration of steel bars and the presence of stirrups 5 and longitudinal reinforcement 6 to improve the overall performance of the core concrete.

[0031] In actual processing and construction, the H-shaped steel 4 with a more complex structure is first configured, and the relevant line dimensions are determined according to the structural schematic diagram of the hook-shaped member 3 and the stud 7. The molds of the hook-shaped member 3 and the stud 7 are first formulated, and they are processed and manufactured in the factory through the moldability of the two, and then the selected standard H-shaped steel 4 with the same overall length and width is processed and polished. The stud 7 is welded to the selected positions on the upper flange, lower flange and web of the H-shaped steel 4. In addition, the hook-shaped member 3 is welded to the upper and lower flange ends of the H-shaped steel 4 to make them fit perfectly, and a number of rows of circular or regular polygonal holes 8 with equal spacing and the same diameter are set from the center position to the upper flange and lower flange direction on the web of the H-shaped steel 4. After the H-shaped steel 4 is configured in the factory, it is poured together with ordinary concrete to form a steel-shaped ordinary concrete square column 2. At the same time, the longitudinal reinforcement 6, closed stirrups 5 and ultra-high performance concrete that have been successfully configured in the factory are poured on the outer layer, so that the longitudinal reinforcement 6 and stirrups 5 are configured in the ultra-high performance concrete U-shaped column 1, and the ultra-high performance concrete U-shaped column 1 can perfectly wrap the steel-shaped ordinary concrete square column 2, and the two can be seamlessly connected. At this time, a standard preparation of the utility model is completed.

[0032] The above detailed implementation methods describe the preferred specific embodiments of the utility model, but this is only for example and does not mean that the utility model is limited to this. The above implementation methods can be modified and implemented through different design concepts. All personnel in this technical field, based on the design concept of the utility model and the use of modern advanced technology, obtain the implementation method through logical reasoning and related experiments. The implementation method must be within the protection scope specified by the relevant text content and meet all current national laws and regulations.

Claims

1. A prefabricated steel UHPC-NC composite column, characterized by: The invention comprises ultra-high performance concrete, ordinary concrete, H-shaped steel (4), longitudinal reinforcement (6), stirrups (5) and studs (7); the steel-concrete column is provided with an ultra-high performance concrete U-shaped column (1) and an ordinary concrete square column (2) with an embedded H-shaped steel (4); the H-shaped steel (4) is an H-shaped steel (4) having a hook-shaped component (3) at the end, a plurality of rows of holes (8) in the middle of the web, and a plurality of rows of studs (7) welded to the flange and the web; the ordinary concrete square column (2) is wrapped by an ultra-high performance concrete U-shaped column (1) with longitudinal reinforcement (6) and closed stirrups (5) inside.

2. The prefabricated steel UHPC-NC composite column according to claim 1, characterized in that The core area of ​​the steel-concrete column is an ordinary concrete square column (2) with embedded H-shaped steel (4), and the outer core area is an ultra-high performance concrete U-shaped column (1) with longitudinal reinforcement (6) and stirrups (5) arranged inside.

3. The prefabricated steel UHPC-NC composite column according to claim 1, characterized in that The hook-shaped components (3) at both ends of the upper flange and the hook-shaped components (3) at both ends of the lower flange of the H-shaped steel (4) are both rectangular.

4. The prefabricated steel UHPC-NC composite column according to claim 1, characterized in that A plurality of rows of studs (7) are arranged on the upper flange, the lower flange and the web of the H-shaped steel (4), and the studs (7) are welded to the outer surfaces of the flange and the web.

5. The prefabricated steel UHPC-NC composite column according to claim 1, characterized in that A plurality of rows of circular or regular polygonal holes (8) with equal spacing and the same diameter are arranged in the middle of the web of the H-shaped steel (4).

6. The prefabricated steel UHPC-NC composite column according to claim 2, characterized in that The longitudinal reinforcement (6) is evenly distributed along the four sides of the square column.

7. The prefabricated steel UHPC-NC composite column according to claim 2, characterized in that Closed stirrups (5) are evenly arranged along the column height.

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