Environment-friendly full-bolt modular energy-consuming steel frame structure and building

Abstract

The invention discloses an environment-friendly full-bolt modular energy-consuming steel frame structure and a building. A high-rigidity energy-consuming beam column joint comprises a cold-formed section steel four-limb closed combination column, an open double-limb combination beam and a hot-rolled section steel connecting piece. And the four-limb closed combination columns and the open double-limb combination beams are connected by bolts through hot-rolled section steel connecting pieces. The node rigidity and the ductility energy dissipation capacity of the frame structure are improved, the beam-column unit single-limb component is high in prefabrication assembly degree, large-scale production and transportation are facilitated, construction is facilitated, precision is high, efficiency is high, and the purpose of green construction is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural engineering, and relates to a fully bolted modular cold-formed steel frame structure system for medium and low-rise buildings (1 to 5 floors), which is particularly suitable for areas with high seismic fortification intensity requirements. Background Art

[0002] With the acceleration of the urbanization process and the increasing demand for building industrialization, steel structure buildings have gradually become an important part of the modern building system due to their advantages such as light weight, high strength, efficient construction, and recyclable materials. However, traditional steel frame structures still face many challenges in practical applications: First, as the core part of the structure for force transmission and energy dissipation, traditional welded or bolt-welded hybrid joints have problems such as complex construction, large on-site work volume, and residual stress easily generated in the heat-affected zone, resulting in difficulty in balancing the joint stiffness and ductility. Especially under strong earthquake action, the overall structure may fail due to local brittle failure; Second, although conventional modular steel structures shorten the construction period through prefabricated components, their joint designs mostly rely on complex structures or on-site secondary processing, resulting in low assembly accuracy and high transportation costs, and it is difficult to meet the requirements of large-scale production; Third, the deepening of the global green building concept has put forward higher requirements for the environmental protection, material utilization rate, and carbon emission control during the construction process. The pollution and energy consumption generated by welding in traditional processes have become bottlenecks restricting the sustainable development of the industry.

[0003] In recent years, scholars at home and abroad have carried out a series of explorations on the above problems. For example, using closed-section composite columns to improve the torsional stiffness of components, or optimizing the structural force transmission path through the arrangement of double-limb beams. However, the application of cold-formed steel in existing technologies is mostly limited to walls or secondary components, and there is still a lack of a systematic solution for its efficient connection with hot-rolled steel nodes. In addition, the joint design of modular frames often only focuses on the convenience of assembly, ignoring the energy dissipation capacity and ductility improvement of the joints themselves, resulting in difficulty in breaking through the seismic performance of the structure. In terms of environmental protection, although the fully bolted connection technology has attracted much attention due to no welding pollution, existing bolted joints often increase the material consumption due to redundant structures, which is contrary to the goals of lightweight and intensive design.

[0004] Based on this, the core of the present invention lies in proposing an environmentally friendly modular steel frame system that integrates high-stiffness energy-dissipating joints and efficient assembly technology. Through the innovative combination of cold-formed steel four-limb closed composite columns and open double-limb composite beams, combined with the optimized design of hot-rolled steel connectors, fully bolted joints are constructed. On the one hand, this solution utilizes the lightweight and high-strength characteristics of cold-formed steel to reduce the self-weight of components and improve the prefabrication rate in the factory; on the other hand, through the high-precision machining of the hot-rolled steel joint area, the reliability and construction efficiency of on-site assembly are ensured. More importantly, the coordinated work of the four-limb closed columns and double-limb beams can form multiple energy-dissipating mechanisms, dissipating energy through controllable plastic deformation under strong earthquakes while maintaining the overall stiffness of the joints, realizing the seismic design concept of "strong joints, weak members". Compared with traditional technologies, the present invention not only solves the contradiction between the seismic performance and assembly efficiency of modular steel structures, but also significantly reduces construction waste through standardized component design and detachable connections throughout the life cycle, conforming to the development trend of green buildings and circular economy. This technological breakthrough provides an innovative solution that combines safety, economy, and environmental protection for high-rise buildings, large-span stadiums, and emergency rapid construction fields. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an environmentally friendly fully bolted modular energy-dissipating steel frame structure and building that can achieve higher joint stiffness and ductile energy-dissipating capacity.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: The present invention first provides two environmentally friendly fully bolted modular energy-dissipating steel frame structures, and the solutions are respectively: The first environmentally friendly fully bolted modular energy-dissipating steel frame structure is assembled from high-stiffness energy-dissipating beam-column joints. The high-stiffness energy-dissipating beam-column joints include two upper and lower composite columns, an open double-limb composite beam, and a first hot-rolled steel connector. The upper and lower composite columns and the open double-limb composite beam are bolted together through the first hot-rolled steel connector. Its characteristics are as follows: The first hot-rolled steel connector includes an upper cross plate, a middle cross plate, a lower cross plate, a horizontal end plate, and 12 angle plates. The flat end plates are located at the upper and lower ends of the middle cross plate, and the upper cross plate and the lower cross plate are symmetric about the middle cross plate; one of the angle plates is provided at each of the four corners of the upper cross plate, the middle cross plate, and the lower cross plate; connection holes for connecting the composite columns or connection holes for connecting the open double-limb composite beam are provided on the upper cross plate, the middle cross plate, the lower cross plate, the horizontal end plate, and the 12 angle plates; the upper cross plate and the lower cross plate are used to connect the two upper and lower composite columns, and the middle cross plate is used to connect the open double-limb composite beam; the horizontal end plate includes a central plate and four wing plates, and the connection holes on the horizontal end plate are located on the four wing plates, and the horizontal end plate is used to connect the open double-limb composite beam.

[0007] The second environmentally friendly all-bolt modular energy-dissipating steel frame structure is assembled by high-rigidity energy-dissipating beam-column joints. The high-rigidity energy-dissipating beam-column joints include two upper and lower composite columns, an open double-web composite beam, an inclined brace between the beam and the column, a second hot-rolled steel connector, and a cross-shaped auxiliary plate. The two upper and lower composite columns and the open double-web composite beam are bolted together through the second hot-rolled steel connector. The lower composite column and the inclined brace between the beam and the column are bolted together through the cross-shaped auxiliary plate. The inclined brace between the beam and the column is bolted to the second hot-rolled steel connector. It is characterized in that the second hot-rolled steel connector includes an upper cross plate, a middle cross plate, a horizontal end plate, and a corner-shaped plate; the horizontal end plate is welded to the upper end of the middle cross plate, and 8 corner-shaped plates are symmetrically welded to the upper and lower sides of the horizontal end plate; a connecting portion extending downward is provided at the lower edge of the middle cross plate; the upper cross plate is provided with connecting holes for connecting the upper composite column. Connecting holes for connecting the open double-web composite beam are provided on the horizontal end plate. Connecting holes for connecting the upper composite column are provided on the 4 corner-shaped plates above the horizontal end plate. Connecting holes for connecting the lower composite column are provided on the 4 corner-shaped plates below the horizontal end plate; the horizontal end plate includes a central plate and four wing plates, and the connecting holes on the horizontal end plate are located on the four wing plates. The horizontal end plate is used to connect the open double-web composite beam.

[0008] The present invention also provides a green and environmentally friendly building, including the two environmentally friendly all-bolt modular steel frame structures provided above.

[0009] The present invention has the following beneficial effects: Through systematic structural optimization, the innovative technical solution of the present invention has achieved multiple technical breakthroughs in terms of joint structure, seismic performance, and maintainability, specifically reflected in the following core advantages: 1. Modular joint structure and high-strength connection system Adopt the collaborative design of hot-rolled steel connectors, cold-formed steel four-limbed closed composite columns, and open double-web composite beams, combined with the technology of bolt connection with packing plates. Among them, the cold-formed steel four-limbed closed composite column and the double-web beam are connected by high-strength bolts through the hot-rolled connector, constructing a standardized prefabricated joint system, and realizing the multi-directional rigid connection of the beam and the column at the same time. The hot-rolled joint area adopts the through-type reinforcement technology of corner-shaped plates - by setting continuous corner-shaped reinforcement plates in the four corners of the cross-shaped joint plate, a box-shaped closed force transmission path is formed, significantly improving the shear stiffness of the joint area and realizing the lightweight connection goal of "less bolts and high strength".

[0010] 2. Innovative replaceable seismic ductility control mechanism (1) Plastic hinge outward displacement device: A dog-bone-shaped weakened area is set on the horizontal end plate. By accurately calculating the flange section weakening rate, it is ensured that the plastic hinge migrates directionally from the joint core area to the beam end, forming an ideal failure mode of "strong joint - weak member".

[0011] (2) Web ductility enhancement unit: A gradient dog-bone weakened energy dissipation section is set on the web of the beam-column diagonal brace, combined with the design of a buckling-restrained plate and a high-strength backing plate to achieve ductility control under both axial tension and compression conditions. When subjected to tension, the weakened energy dissipation section enters the plastic stage first to dissipate energy; when compressed, the buckling-restrained plate provides lateral restraint to prevent local buckling of the weakened energy dissipation section, forcing the energy dissipation section to yield under compression and enter the energy dissipation stage.

[0012] (3) Quick replacement interface: All energy dissipation components (such as double-limb beam single-limb, dog-bone end plate, diagonal brace unit, etc.) adopt standardized bolt interfaces, which can be locally replaced after seismic damage, greatly reducing maintenance costs and the structural repair cycle.

[0013] 3. Sustainable design throughout the life cycle Based on the parametric design of components using BIM technology, complete factory prefabrication of beam-column units and node connectors is achieved. On-site construction only requires bolt assembly, completely eliminating environmental pollution and energy consumption caused by welding operations, and all components can be disassembled and reassembled without damage. The material recovery rate after building disassembly far exceeds that of traditional welded assembly steel structures, perfectly meeting the requirements of circular economy development. Brief description of the drawings

[0014] In order to more clearly illustrate the embodiments of the present invention or the solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of a two-story two-span all-bolt modular cold-formed steel building structure for assembling node modules in the embodiment; Figure 2 It is Figure 1 A schematic diagram of a two-story two-span all-bolt modular cold-formed steel frame in Figure 3 It is Figure 1 A schematic diagram of a two-story two-span all-bolt modular cold-formed steel frame (beam-column joint with diagonal brace) in Figure 4 It is a schematic diagram of a beam-column joint structure in the embodiment; Figure 5 It is Figure 4 A schematic diagram of the internal assembly of a beam-column joint; Figure 6 It is a schematic diagram of a beam-column joint (with diagonal brace) structure in the embodiment; Figure 7 It is Figure 6 A schematic diagram of the internal assembly of a beam-column joint (with diagonal brace); Figure 8 It isFigure 4 The first form of hot-rolled steel connectors in beam-column joints; Figure 9 is Figure 6 The second form of hot-rolled steel connectors in beam-column joints; Figure 10 is Figure 6 Cross-shaped auxiliary plate in beam-column joints; Figure 11 is Figure 6 Inclined bracing between beam and column in beam-column joints; Figure 12 is Figure 4 and Figure 6 Composite column in beam-column joints; Figure 13 is Figure 12 Cross-sectional view of the composite column in; Figure 14 is Figure 12 Schematic diagram of a single limb of the composite column in; Figure 15 is Figure 12 Intermediate plate between limbs of the composite column in; Figure 16 is Figure 4 and Figure 6 Open double-limb composite beam in beam-column joints; Figure 17 is Figure 16 Open single-limb beam in; Figure 18 is Figure 16 Filler plate in the composite beam in; In the figure: 1. Interlayer floor; 2. Wall panel; 3. Top floor; 4. Door; 5. Window; 6. Composite column; 6a. Single limb; 6b. Extended flange; 6c. First intermediate plate; 6d. Steel plate corner; 6e. Extended flange groove; 7. Open double-limb composite beam; 7a. Open single-limb beam; 7b. Wide flange of the open single-limb beam; 7c. Flange of the open single-limb beam; 8. First hot-rolled steel connector; 9. Inclined bracing between beam and column; 9a. Single-limb hot-rolled C-shaped steel; 9b. Buckling-restrained plate; 9c. Second intermediate plate; 10. Second hot-rolled steel connector; 11. Horizontal end plate; 12. Bolt; 13. Filler plate; 14. Angle plate; 15. Cross-shaped auxiliary plate. Detailed implementation mode

[0016] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all belong to the scope protected by the present invention.

[0017] In the description of the present invention, it should be noted that, without conflict, the materials used in the structural system of the present invention are not limited to steel. The use of galvanized sheets, stainless steel, aluminum alloy, copper, wooden squares or other feasible materials all fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "opening", "outstretching", "up and down", "longitudinal", "transverse and longitudinal", "corner", "inner", "outer", "between columns", etc. are based on the methods or positional relationships shown in the drawings, and are only for convenience of description, rather than indicating or implying that the indicated positions or elements must have a specific orientation, be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "single limb", "closed mouth", "opening", "outstretched flange", "cross", "square", "filling plate", "auxiliary plate", etc. are only for convenience of description, rather than indicating or implying a specific form that the indicated structure or component must have. All other forms of components that can adopt the novel connection nodes disclosed in the present invention fall within the scope of protection of the present invention.

[0019] The following further describes the embodiments of the present invention in detail with reference to the drawings: Embodiment 1

[0020] This embodiment provides an environmentally friendly all-bolt modular energy-dissipating steel frame structure building, as Figure 1 , Figure 2 shown. The frame structure of the environmentally friendly all-bolt modular energy-dissipating steel frame structure building is constructed by high-rigidity energy-dissipating beam-column joints.

[0021] The high-rigidity energy-dissipating beam-column joint, as Figure 4 and Figure 5 shown, includes two upper and lower composite columns 6, an open double-limb composite beam 7, and a first hot-rolled steel connector 8. The upper and lower composite columns 6 and the open double-limb composite beam 7 are connected by bolts 12 through the first hot-rolled steel connector 8.

[0022] As Figure 8 shown, the first hot-rolled steel connector 8 includes an upper cross plate, a middle cross plate, a lower cross plate, horizontal end plates 11 and 12 angle plates 14. The flat end plates 11 are located at the upper and lower ends of the middle cross plate, and the upper cross plate and the lower cross plate are symmetric about the middle cross plate. An angle plate 14 is respectively arranged at the four corners of the upper cross plate, the middle cross plate, and the lower cross plate. Connection holes for connecting the composite column 6 or connection holes for connecting the open double-limb composite beam 7 are arranged on the upper cross plate, the middle cross plate, the lower cross plate, the horizontal end plates 11 and the 12 angle plates 14. The upper cross plate and the lower cross plate are used to connect the two upper and lower composite columns 6, and the middle cross plate is used to connect the open double-limb composite beam 7.

[0023] The setting method of the angle plate 14 with the upper cross plate, the middle cross plate, and the lower cross plate is welding.

[0024] The horizontal end plate 11 includes a center plate and four wing plates. The connection between the wing plates and the center plate is a necking section, which has a smaller width than other places and is shaped like a dog bone. The connection holes on the horizontal end plate 11 are processed on the four wing plates.

[0025] As Figures 12 - 15 shown, the composite column 6 in this embodiment is a cold-formed steel lipped closed column ( Figure 12 ), which is formed by splicing two pairs of single limb column sheets 6a with the same structure. The single limb column sheet 6a is a cold-formed steel plate with an extended lip 6b, and the cross-section is kept through to form a rectangular section column with an extended lip ( Figure 13 ). Along the longitudinal direction, connection holes are opened at the extended lip grooves 6e of the single limb column sheet 6a at regular intervals, and are connected with bolts 12 through the first backing plate 6c ( Figure 14 ). The first backing plate 6c is a square steel plate ( Figure 15 ), which is placed between adjacent column limbs close to the inner side of the extended lip, and the width is the same as that of the extended lip, and connection holes are opened in the middle. The user first places two lip steel plates symmetrically, and connects them by passing bolts through the corresponding connection holes in the extended lip groove and the first backing plate in turn. The all-bolt connection can avoid on-site welding and ensure the integrity, strength, stiffness and stability of the composite column.

[0026] As Figures 16 - 18 shown, the open double-limb composite beam 7 ( Figure 16 ) in this embodiment is formed by connecting two open single-limb beams 7a ( Figure 17 ) back-to-back with bolts 12 through a filler plate 13 ( Figure 18 ) in the middle.

[0027] The connection method between the composite column 6 and the first hot-rolled steel connector 8 is: the first hot-rolled steel connector 8 is inserted into the splicing seam of the four single limb column sheets 6a and is connected by bolts 12.

[0028] The connection method between the open double-limb composite beam 7 and the first hot-rolled steel connector 8 is: the first hot-rolled steel connector 8 is inserted into the splicing seam of the two open single-limb beams 7a and is connected by bolts 12. Embodiment 2

[0029] This embodiment provides an environment-friendly all-bolt modular energy-dissipating steel frame structure building, as Figure 1 、 Figure 3 shown. The frame structure of the environment-friendly all-bolt modular energy-dissipating steel frame structure building is constructed by high-rigidity energy-dissipating beam-column joints.

[0030] The high-rigidity energy-dissipating beam-column joints, such as Figure 6 and Figure 7As shown in the figure, it includes two upper and lower composite columns 6, an open double-web composite beam 7, a diagonal brace 9 between the beam and column, a second hot-rolled steel connector 10, and a cross-shaped auxiliary plate 15. The two upper and lower composite columns 6 and the open double-web composite beam 7 are connected by bolts 12 using the second hot-rolled steel connector 10. The lower composite column and the diagonal brace 9 between the beam and column are connected by bolts 12 using the cross-shaped auxiliary plate 15. The diagonal brace 9 between the beam and column is connected to the second hot-rolled steel connector 10 by bolts 12.

[0031] As Figure 9 shown in the figure, the second hot-rolled steel connector 10 includes an upper cross plate, a middle cross plate, a horizontal end plate 11, and eight angle plates 14. The horizontal end plate 11 is welded to the upper end of the middle cross plate. The eight angle plates 14 are symmetrically welded on the upper and lower sides of the horizontal end plate 11. A connecting portion extending downward is provided at the lower edge of the middle cross plate. Connecting holes for connecting the upper composite column 6 are provided on the upper cross plate. Connecting holes for connecting the open double-web composite beam 7 are provided on the horizontal end plate 11. Connecting holes for connecting the upper composite column are provided on the four angle plates 14 above the horizontal end plate 11, and connecting holes for connecting the lower composite column are provided on the four angle plates 14 below the horizontal end plate 11.

[0032] The horizontal end plate 11 includes a center plate and four wing plates. The connection between the wing plates and the center plate is a necking section with a smaller width than other places, and its shape is like a dog bone. The connecting holes on the horizontal end plate 11 are processed on the four wing plates.

[0033] As Figure 10 shown in the figure, connecting holes for connecting the lower composite column and connecting holes for connecting the diagonal brace 9 between the beam and column are processed on the cross-shaped auxiliary plate 15. The cross-shaped auxiliary plate 15 can be welded by three steel plates, namely one steel plate and two small steel plates on the midline of the welded large steel plate.

[0034] As Figure 11 shown in the figure, the diagonal brace 9 between the beam and column is formed by connecting two single-leg hot-rolled C-shaped steels 9a and two buckling-restrained plates 9b with bolts 12. The buckling-restrained plates 9b are located inside the single-leg hot-rolled C-shaped steels 9a. The middle of the web of the single-leg hot-rolled C-shaped steel 9a is a necking section with a smaller width than other places, and its shape is like a dog bone. The upper end of the diagonal brace 9 between the beam and column is connected to the downward-extending connecting portion of the second hot-rolled steel connector 10, and the lower end of the diagonal brace 9 between the beam and column is connected to the cross-shaped auxiliary plate 15.

[0035] A second backing plate 9c can also be placed between the two single-leg hot-rolled C-shaped steels 9a, and the single-leg hot-rolled C-shaped steels 9a, the buckling-restrained plates 9b, and the second backing plate 9c are connected together into a whole with bolts 12.

[0036] As Figures 12 - 15 shown in the figure, the composite column 6 in this embodiment is a cold-formed steel lipped closed column ( Figure 12), which is formed by splicing two pairs of single - limb column sheets 6a with the same structure. The single - limb column sheet 6a is a cold - formed steel plate with an extended flange 6b, and the cross - section is kept continuous to form a rectangular - section column with an extended flange ( Figure 13 ). Along the longitudinal direction, at regular intervals, connection holes are opened at the groove 6e of the extended flange of the single - limb column sheet 6a, and are connected to the bolt 12 through the first backing plate 6c ( Figure 14 ). The first backing plate 6c is a square steel plate ( Figure 15 ), which is placed between adjacent column limbs close to the inner side of the extended flange. Its width is the same as that of the extended flange, and connection holes are opened in the middle. The user first places two flange steel plates symmetrically, and uses bolts to pass through the corresponding connection holes in the groove of the extended flange and the backing plate in turn for connection. The all - bolt connection can avoid on - site welding and ensure the integrity, strength, stiffness and stability of the composite column.

[0037] As Figures 16 - 18 shown, in this embodiment, the open double - limb composite beam 7 ( Figure 16 ), is respectively composed of two open single - limb beams 7a ( Figure 17 ), and are connected back - to - back by bolts 12 through the filling plate 13 ( Figure 18 ).

[0038] The connection method between the composite column 6 and the second hot - rolled steel connector 10 is: the second hot - rolled steel connector 10 is inserted into the splicing seam of the four single - limb column sheets and is connected by bolts 12.

[0039] The connection method between the open double - limb composite beam 7 and the second hot - rolled steel connector 10 is: the second hot - rolled steel connector 10 is inserted into the splicing seam of the two open single - limb beams and is connected by bolts 12.

[0040] Finally, it should be noted that: 1. The dimensions in the drawings of the specification are only for reference and do not represent the actual ratio. The dimensions of the actual components may be different, depending on the specific implementation and manufacturing requirements.

[0041] 2. The reference parts in the drawings of the specification do not show key components such as wall panels, floors, and wall stud supports in the unit frame. In actual implementation, the unit frame includes these components and plays an important role in the implementation of the invention. Only a partial schematic of the unit frame is shown in the drawings to more clearly show the core features of the invention. Please refer to this description for a comprehensive understanding of the invention.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An environmentally friendly fully bolted modular energy-absorbing steel frame structure, assembled from high-rigidity energy-absorbing beam-column nodes, wherein the high-rigidity energy-absorbing beam-column nodes include two upper and lower composite columns, an open double-limb composite beam and a hot-rolled steel connector. The upper and lower composite columns and the open double-limb composite beam are connected by bolts through the hot-rolled steel connector, characterized in that: The hot-rolled steel connector includes an upper cross plate, a middle cross plate, a lower cross plate, a horizontal end plate and 12 angle plates, the flat end plates are located at the upper and lower ends of the middle cross plate, and the upper cross plate and the lower cross plate are symmetrical about the middle cross plate; an angle plate is respectively arranged on the four corners of the upper cross plate, the middle cross plate and the lower cross plate; the upper cross plate, the middle cross plate, the lower cross plate, the horizontal end plate and the 12 angle plates are all provided with connection holes for connecting composite columns or connection holes for connecting open double-limb composite beams; the upper cross plate and the lower cross plate are used to connect the upper and lower composite columns, and the middle cross plate is used to connect the open double-limb composite beam; the horizontal end plate includes a center plate and four wing plates, the connection holes on the horizontal end plate are located on the four wing plates, and the horizontal end plate is used to connect the open double-limb composite beam.

2. The environmentally friendly all-bolt modular energy-absorbing steel frame structure according to claim 1 is characterized in that: The connection between the wing plate and the center plate is a necked section, which has a smaller width than other places and is shaped like a dog bone.

3. The environmentally friendly all-bolt modular energy-absorbing steel frame structure according to claim 1 is characterized in that: The angle plate, the upper cross plate, the middle cross plate and the lower cross plate are arranged by welding.

4. The environmentally friendly all-bolt modular energy-absorbing steel frame structure according to claim 1 is characterized in that: The combined column is a cold-formed steel curling closed column, which is formed by splicing four single-leg column pieces of the same structure in pairs; the single-leg column piece is a cold-formed steel plate with an overhanging curling, and the cross section is kept through to form a rectangular cross-section column with an overhanging curling; the single-leg column piece is provided with connection holes at the overhanging curling groove of the single-leg column piece at intervals along the longitudinal direction, and is connected with bolts through a pad; The pad is a square steel plate, which is placed between adjacent column limbs and close to the inner side of the overhanging curling edge. Its width is consistent with the overhanging curling edge, and a connecting hole is provided in the middle.

5. A building, characterized in that: It comprises the environmentally friendly all-bolt modular energy-absorbing steel frame structure as described in any one of claims 1-4.

6. An environmentally friendly fully bolted modular energy-absorbing steel frame structure, assembled from high-rigidity energy-absorbing beam-column nodes, wherein the high-rigidity energy-absorbing beam-column nodes have two upper and lower composite columns, an open double-limb composite beam, a beam-column diagonal brace, two hot-rolled steel connectors, and a cross-shaped auxiliary plate. The upper and lower composite columns and the open double-limb composite beam are connected by bolts through the two hot-rolled steel connectors, the lower composite column and the beam-column diagonal brace are connected by bolts through the cross-shaped auxiliary plate, and the beam-column diagonal brace is connected to the two hot-rolled steel connectors by bolts, characterized in that: The second hot-rolled steel connector includes an upper cross plate, a middle cross plate, a horizontal end plate and an angle plate; the horizontal end plate is welded to the upper end of the middle cross plate, and 8 angle plates are symmetrically welded to the upper and lower sides of the horizontal end plate; the lower edge of the middle cross plate is provided with a connection portion extending downward; the upper cross plate is provided with a connection hole for connecting the upper composite column. The horizontal end plate is provided with a connection hole for connecting the open double-limb composite beam, the 4 angle plates located above the horizontal end plate are provided with a connection hole for connecting the upper composite column, and the 4 angle plates located below the horizontal end plate are provided with a connection hole for connecting the lower composite column; the horizontal end plate includes a center plate and four wing plates, the connection holes on the horizontal end plate are located on the four wing plates, and the horizontal end plate is used to connect the open double-limb composite beam.

7. The environmentally friendly all-bolt modular energy-absorbing steel frame structure according to claim 6 is characterized in that: The connection between the wing plate and the center plate is a necked section, which has a smaller width than other places and is shaped like a dog bone.

8. The environmentally friendly all-bolt modular energy-absorbing steel frame structure according to claim 6 is characterized in that: The beam-column diagonal brace is formed by connecting two single-leg hot-rolled C-shaped steels and two anti-buckling plates by bolts, and the anti-buckling plates are located on the inner side of the single-leg hot-rolled C-shaped steels.

9. The environmentally friendly all-bolt modular energy-absorbing steel frame structure according to claim 6 is characterized in that: The combined column is a cold-formed steel curling closed column, which is formed by splicing four single-leg column pieces of the same structure in pairs; the single-leg column piece is a cold-formed steel plate with an overhanging curling, and the cross section is kept through to form a rectangular cross-section column with an overhanging curling; the single-leg column piece is provided with connection holes at the overhanging curling groove of the single-leg column piece at intervals along the longitudinal direction, and is connected with bolts through a pad; The pad is a square steel plate, which is placed between adjacent column limbs and close to the inner side of the overhanging curling edge. Its width is consistent with the overhanging curling edge, and a connecting hole is provided in the middle.

10. A building, characterized in that: It comprises the environmentally friendly all-bolt modular energy-absorbing steel frame structure as described in any one of claims 6-9.

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