All-bolt assembled beam-column joint, steel frame structure and building

Abstract

The application discloses a green and environment-friendly full-bolt modular cold-formed steel frame structure, and relates to a full-bolt modular cold-formed steel frame beam-column connecting joint which comprises two combined columns, a four-limb special-shaped C-shaped combined beam and a node area column inter cross-shaped node plate, a node area column inter cross-shaped auxiliary plate and a beam-column inter inclined brace; the two combined columns and the four-limb special-shaped C-shaped combined beam are connected by bolts through the node area column inter cross-shaped node plate, the column inter cross-shaped auxiliary plate and the beam-column inter inclined brace. The application improves the node stiffness of the frame structure, and the beam-column unit single-limb component has high prefabrication and assembly degree, is convenient for large-scale production and transportation, is convenient for construction, has high precision, high efficiency and the like, meets the green construction purpose, and the modular steel frame structure combines advanced materials and energy-saving and environment-friendly standards due to high prefabrication and recyclability, so as to improve building efficiency, reduce cost and reduce the influence on the environment.

Description

Technical Field

[0001] This invention belongs to the field of structural engineering technology, and particularly relates to a fully bolted modular cold-formed steel frame structure system for mid-to-high-rise buildings (3 to 5 stories), which is suitable for areas with high requirements for seismic fortification intensity and lateral stiffness. Background Technology

[0002] With the rapid development of my country's construction industry, construction demands and technological innovations are constantly increasing. Limited by the high energy consumption of traditional building systems and the trend of industrialization, there is a growing need for standardized, integrated design, production, construction, decoration, and management of buildings. This necessitates the development of energy-saving, environmentally friendly, and efficient building systems to improve the overall performance and construction efficiency of buildings, and to promote the transformation, technological upgrading, and sustainable development of the construction industry. Modular steel structures, as one of the important directions in my country's current construction development, have greatly promoted the application and popularization of steel structures due to their significant advantages such as high efficiency, environmental friendliness, and short construction cycles. Exploring how high-prefabrication-rate frame structure systems can achieve more convenient and rapid installation is of great research value.

[0003] While steel structure buildings have significantly improved upon the shortcomings of traditional buildings, the connection and installation of commonly used hot-rolled steel sections and steel plate composite components still primarily rely on welding. These components are heavy, requiring substantial on-site welding work, demanding advanced welding techniques, and are inconvenient for transportation and on-site installation. In cold-formed steel structure systems, the advantages of high component plasticity, diverse cross-sectional forms, and flexible arrangement have led to their wider application. However, the commonly used light steel keel system is a distributed load-bearing system, with inflexible spatial arrangement and limited stiffness. Therefore, research on the design of new node forms and beam-column cross-sectional forms, as well as the study of fully bolted connections in modular cold-formed steel frames, remains of great research value. In Professor Yin Lingfeng's research group, two novel node connection forms were introduced regarding the application of cold-formed steel in beam-column joints: "A Frame Column, Frame Node and All-Bolt Prefabricated Frame Structure System" (CN112942571 B) and "Frame Column, Frame Node and All-Bolt Prefabricated Frame Structure System" (CN 112942570 A). The former uses two straight-edged corrugated steel plates and two rolled-edged corrugated steel plates as the node columns, resulting in inconsistent column forms. The beam units in the node area also use a combination of double-limb C-type (or double ∑-type) and welded beams. Furthermore, the upper and lower column splices are connected by external reinforcing plates within the column, making the splicing process rather cumbersome. The latter uses a unified beam-column joint form, but due to the limitations of the node form, the node columns are not separated in the node area. Instead, an inner sleeve is used within the column to achieve the splicing of the upper and lower columns. While the two node types mentioned above greatly improve the efficiency of on-site installation of prefabricated frames, they are still somewhat insufficient for modular buildings. They are only suitable for on-site installation and cannot achieve pre-assembly of unit frames. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a green and environmentally friendly all-bolted modular cold-formed steel frame structure and building that achieves higher assembly efficiency, so as to be applied in areas with high seismic fortification intensity and high lateral stiffness requirements.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention first provides a fully bolted assembled beam-column joint, including two composite columns, a four-limb irregular C-shaped composite beam, a cross-shaped node plate between columns in the joint area, a cross-shaped auxiliary plate in the column in the joint area, and diagonal bracing between beam and column; the two composite columns and the four-limb irregular C-shaped composite beam are connected by bolts through the cross-shaped node plate between columns in the joint area, the cross-shaped auxiliary plate in the column, and the diagonal bracing between beam and column. The composite column is made up of four identical single-limb column plates with outward rolled edges spliced ​​together in pairs, maintaining a continuous cross-section to form a rectangular cross-section column with outward rolled edges; the cold-formed steel plate has bolt holes at intervals along the longitudinal direction at the outward rolled edges, and is connected to the bolts by a backing plate; The composite beam is a four-limb irregular C-shaped single-limb beam connection. The four-limb irregular C-shaped composite beam consists of two upper irregular C-shaped single-limb beams and two lower irregular C-shaped single-limb beams. One upper irregular C-shaped single-limb beam and one lower irregular C-shaped single-limb beam are connected to form a single-sided integral component. The two single-sided integral components are connected back to back. The cross-shaped node plate between the nodes is formed by vertically welding two square plates. Bolt holes for connecting the composite columns and bolt holes for connecting the four-limb irregular C-shaped composite beams are machined on the square plates of the cross-shaped node plate between the nodes. The bolt holes for connecting the four-limb irregular C-shaped composite beams include bolt holes for connecting the upper irregular C-shaped single beams and bolt holes for connecting the lower irregular C-shaped single beams. The flat filler plates between composite beams in the node include angled filler plates, square filler plates and straight filler plates; bolt holes for connecting the upper and lower composite beams are machined on each filler plate, and bolt holes for connecting the diagonal braces between beams and columns are also machined on the angled filler plates; The connection method of the cross-shaped gusset plate between the composite column and the node column is as follows: the cross-shaped gusset plate between the node columns is inserted into the splice joint of four cold-formed steel plates and connected by bolts; The cross-shaped auxiliary plates in composite columns and node columns are connected as follows: the cross-shaped auxiliary plates in the node columns are inserted into the splice joint of four cold-formed steel plates and connected by bolts. The connection method between the four-limb irregular C-shaped composite beam and the cross-shaped node plate between the nodes is as follows: the cross-shaped node plate between the nodes is inserted into the splice joint of the two symmetrical single-sided integral components of the four-limb irregular C-shaped composite beam, and is connected by bolts. The connection method between the four-limb irregular C-shaped composite beam and the cross-shaped auxiliary plate in the node column is as follows: the cross-shaped auxiliary plate in the node column is connected to the diagonal filler plate between the splice joints of the two symmetrical single-sided integral components of the four-limb irregular C-shaped composite beam through the beam-column diagonal bracing, and the connection plate at the end of the diagonal bracing is connected to the opening at the bottom flange of the four-limb irregular C-shaped composite beam by bolts. The connection method between the diagonal brace and the composite column and composite beam is as follows: the side plates at both ends of the diagonal brace are connected to the corresponding bolt holes on the outer rolled edge of the composite column and the bottom flange of the composite beam, and then connected to the cross-shaped auxiliary plate in the column and the diagonal filler plate between the beams through the bolt holes on the web of the diagonal brace.

[0006] When the upper and lower composite columns are connected at the node, four external angle steels are set and placed at the four corners of the composite column, and then bolted to the composite column as one unit; the corresponding bolt holes on the cross-shaped node plate between the node columns are bolted to the openings of the four cold-formed steel plates with the extended rolled edges.

[0007] The upper-layer irregular C-shaped single-limb beam is larger than the lower-layer irregular C-shaped single-limb beam, and the upper flange width of the upper-layer irregular C-shaped single-limb beam is greater than the lower flange width; the lower flange width of the lower-layer irregular C-shaped single-limb beam is greater than the upper flange width; the upper and lower flange widths of the upper-layer irregular C-shaped single-limb beam are consistent with the lower and upper flange widths of the lower-layer irregular C-shaped single-limb beam, respectively, and the upper and lower single-limb beams are spliced ​​together by bolts at the narrow flanges, and then the two single-sided integral components are connected back to back by bolts to form a back-to-back open composite beam.

[0008] The present invention also provides a fully bolted assembled steel frame structure, which is assembled from the aforementioned fully bolted assembled beam-column joints.

[0009] The fully bolted prefabricated beam-column joint assembly method includes: Method 1: First, a unit module frame 1 is assembled from six column units, upper and lower beam units connecting the six column units, and cross-shaped node plates and cross-shaped auxiliary plates set on the six column units. The column units are complete composite columns. The upper and lower beam units in the unit module frame 1 correspond to the lower double-limb beam and upper double-limb beam of the four-limb irregular C-shaped composite beam, respectively. The splicing between unit module frames 1 is achieved through the cross-shaped node plates and cross-shaped auxiliary plates in the node areas of adjacent unit module frames 1. The unit module frames 1 are installed sequentially according to the structural requirements of the node areas. This method can realize bidirectional splicing between units.

[0010] The fully bolted prefabricated beam-column joint assembly method includes: Method 2: First, six column units and upper and lower beam units connecting the six column units are assembled into a unit module frame 2; wherein the column unit includes four quarter-combination columns located at the corners and two half-combination columns located in the middle; the upper and lower beam units in unit module frame 2 correspond to the lower single-limb beam and upper single-limb beam of the four-limb irregular C-shaped composite beam respectively; unit module frame 2 does not have pre-installed inter-column cross-shaped node plates and column-mounted cross-shaped auxiliary plates; The second unit module frame is installed sequentially according to the structural requirements of the node area. Each single-limb column and single-limb beam is connected to the single-limb column through the bolt holes of the side plate at the end of the single-limb beam, and further reinforced by the wall keel. This method can also realize free splicing between the unit module frames in both horizontal and vertical directions.

[0011] The present invention also provides a prefabricated building, including the all-bolted prefabricated steel frame structure described above.

[0012] The hoisting method for the first type of fully bolted prefabricated beam-column joint assembly is as follows: the inter-column cross-shaped node plate and the column-in-column cross-shaped auxiliary plate are pre-installed on the first unit module frame. When splicing the upper and lower units, the first unit module frame is directly placed vertically on the corresponding external inter-column cross-shaped node plate in the node area of ​​the first unit module frame. The splicing of the upper and lower units module frames is completed by bolts. When splicing in the plane, adjacent units module frames are respectively connected into one unit by the inter-column cross-shaped node plate, the column-in-column cross-shaped auxiliary plate, the single-layer double-limb composite beam, and the beam-column diagonal bracing on one side of the node area.

[0013] The hoisting method for the second type of fully bolted prefabricated beam-column joint assembly is as follows: When assembling the upper and lower units by hoisting, the upper unit module frame 2 is connected to the lower unit module frame 2 by bolts through the bottom irregular C-shaped single-limb beam and the top irregular C-shaped single-limb beam of the lower unit module frame 2 to form a single-sided integral component. Then, the beam is connected to the other side of the integral component between the adjacent units by bolts through the inter-beam I-shaped filler plate, square filler plate and oblique filler plate. When assembling in the plane, the adjacent unit module frames 2 are respectively spliced ​​into a whole by the centrally placed cross-shaped node plate and the cross-shaped auxiliary plate in the column, and the support is further strengthened by the diagonal bracing between the beam and column and the wall keel.

[0014] The present invention has the following beneficial results: This invention mainly includes a type of composite column, a type of composite beam, a type of inter-column cross-shaped node plate, a type of column-within-a-column cross-shaped auxiliary plate, and a type of beam-column diagonal brace. The beam-column joint provided by this invention adopts a more convenient node column form, with a unified column limb form, making installation more convenient. The upper and lower columns are also assembled in the node area, ensuring the integrity of the unit module frame node columns. The advantage of this design is that the unit module frame can achieve modular splicing and transportation, overcoming the drawbacks of column span connections. It retains the requirement for efficient and convenient long-distance transportation of the original single-limb components, while also meeting the pre-assembly and transportation of the unit module frame. It can be directly hoisted and spliced ​​on-site using the unit module frame to achieve higher assembly efficiency. Furthermore, this invention proposes matching unit module frames and assembly diagrams for each node form, further improving node flexibility, installation efficiency, node strength, and stability, and can further expand market application scenarios.

[0015] The beam-column unit of this invention is assembled from four steel plates, which are bolted together at the extended rolled edges. This facilitates on-site assembly, and the cold-rolled, specifically shaped components can be transported in single-limb stacks, improving transportation efficiency. The column unit adopts a closed-section design with biaxial symmetry for the four-limb combined column, increasing the column's torsional stiffness and improving its anti-distortion performance. The extended rolled edge design reduces the width-to-thickness ratio of the plates, increasing buckling capacity and stability. The columns are connected using inter-column cross-shaped node plates and external angle steel. An additional inter-column cross-shaped auxiliary plate is added, and all node areas are bolted together, making disassembly and replacement more convenient and flexible, and further improving lateral stiffness.

[0016] The beam-column connection of this invention adopts a cross-shaped node plate between columns, a cross-shaped auxiliary plate in the column, and diagonal bracing between beams and columns. The composite beam adopts a four-limb irregular C-shaped composite beam, with filler plates designed between each limb for connection, all of which are spliced ​​by bolts. The components of each limb in the beam, the connectors in the node area, and the nodes can also be replaced at will, making it flexible in use.

[0017] This invention achieves a fully bolt-free, weld-free connection, employs a more convenient beam-column joint design, and boasts higher installation efficiency. It not only facilitates long-distance transportation but also allows for prefabrication or on-site installation, resulting in a higher degree of assembly. It also offers greater flexibility in node types and unit configurations, flexible spatial arrangement, and easier replacement and maintenance of structural components. Secondly, modular steel frame structures are an increasingly popular technology in the construction industry. They combine modern architectural design concepts, advanced materials, and energy-saving and environmental standards to improve construction efficiency, reduce costs, and minimize environmental impact. Modular steel frame structures excel in many aspects due to their high degree of prefabrication and recyclability, as well as the lightweight and strength of steel structures. The introduction of thin-walled cold-formed steel structures further enhances their performance, offering superior performance through lightweight, high strength, and good plasticity, facilitating the manufacture of components of various shapes and sizes to meet diverse architectural design needs. These components, including frames, walls, doors, windows, and interior finishes, can be prefabricated in factories and transported to the site for rapid assembly, significantly shortening the construction cycle and improving building quality and precision. Modular buildings allow for precise control of material usage during design and manufacturing, reducing waste and effectively minimizing energy consumption. By using recyclable materials, reducing on-site construction waste, and improving building energy efficiency, modular steel frame structures contribute to more environmentally friendly and sustainable building projects. Modular design allows buildings to be expanded or modified as needed, providing greater flexibility and adaptability. Furthermore, noise, dust, and waste generated on construction sites are significantly reduced, resulting in a smaller environmental impact. In summary, the promotion of modular steel frame structures in energy conservation and environmental protection has significant practical implications and long-term development prospects. It not only aligns with the development trend of green building but also responds to the requirements of global sustainable development. Attached Figure Description

[0018] To more clearly illustrate the solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a two-story, two-span, fully bolted modular cold-formed steel building structure assembled from node modules in the embodiment. Figure 2 yes Figure 1 Schematic diagram of a single-layer, fully bolted, modular cold-formed steel frame; Figure 3 This is a schematic diagram of the beam-column joint in an embodiment; Figure 4 yes Figure 3Schematic diagram of the internal assembly of beam-column joint; Figure 5 yes Figure 3 Cross-shaped gusset plate between columns in beam-column joints; Figure 6 yes Figure 3 Cross-shaped auxiliary plate in the column of the beam-column joint; Figure 7 yes Figure 3 Diagonal bracing in beam-column joints.

[0020] Figure 8 yes Figure 3 Composite columns in beam-column joints; Figure 9 yes Figure 8 Composite column angle steel; Figure 10 yes Figure 8 The combined column spacer plate; Figure 11 yes Figure 8 Schematic diagram of a single-limb column in a composite column; Figure 12 yes Figure 3 Four-limb irregular C-shaped composite beam in beam-column joint; Figure 13 yes Figure 12 Atypical C-shaped unilimb trabeculae in the upper and middle limbs; Figure 14 yes Figure 12 Atypical C-shaped unilateral limb trabeculae in the middle and lower limbs; Figure 15 yes Figure 12 The oblique filler plate in the composite beam; Figure 16 yes Figure 12 The straight filler plate in the composite beam; Figure 17 yes Figure 12 Square filler plate in composite beam; Figure 18 This is a unit module framework composed of spliced ​​nodes from an embodiment; Figure 19 yes Figure 18 Unit module framework - plan layout - schematic diagram; Figure 20 yes Figure 18 Schematic diagram of the unit module framework: Plan layout 1; Figure 21 yes Figure 20 Parallel overlap between adjacent unit module frames. Figure 22 yes Figure 20 The overlap between a vertical unit module frame and two horizontal unit module frames; Figure 23 yes Figure 20 The overlap between one vertical unit module frame and three horizontal unit module frames; Figure 24 yes Figure 18 A more detailed planar connection diagram of adjacent unit module frames; Figure 25 yes Figure 18 A more detailed diagram showing the vertical splicing of adjacent unit modules in the frame; Figure 26 This is the second unit module framework formed by splicing nodes in the embodiment; Figure 27 yes Figure 26 Schematic diagram of the planar layout of the unit module framework; Figure 28 yes Figure 26 Schematic diagram of the second planar layout of the unit module framework; Figure 29 yes Figure 28 Parallel connections between adjacent unit module frames in the middle; Figure 30 yes Figure 28 The splicing of one vertical unit module frame 2 and two horizontal unit module frames 2; Figure 31 yes Figure 28 The splicing of one vertical unit module frame 2 and three horizontal unit module frames 2; Figure 32 yes Figure 26 A more detailed vertical splicing diagram of two adjacent unit module frames in the middle; Figure 33 yes Figure 26 A more detailed horizontal splicing diagram of two adjacent unit module frames in the middle; Figure 34 yes Figure 33 A more detailed horizontal splicing diagram of the facade of two adjacent unit module frames; Figure 35 yes Figure 26 A more detailed diagram showing the vertical splicing of two adjacent unit modules in the frame; In the diagram: 1. Inter-floor slab; 2. Wall panel; 3. Top floor slab; 4. Door; 5. Window; 6. Composite column; 6a. Single-limb column plate; 6b. Outwardly rolled edge; 6c. Pad plate; 6d. Steel plate corner; 6e. Outwardly rolled edge groove; 6f. Outer angle steel; 7. Four-limb irregular C-shaped composite beam; 7a. Upper limb irregular C-shaped single-limb beam; 7b. Lower limb irregular C-shaped single-limb beam; 7c. End connecting side plate; 7d. Irregular C-shaped single-limb beam with wide flange; 7e. Irregular C-shaped single-limb beam with narrow flange; 8. Cross-shaped node plate between columns; 9. Cross-shaped auxiliary plate in column; 9a. Thickened welded plate at the end of the cross-shaped auxiliary plate in column; 10. Beam-to-beam angled filler plate; 10a. Thickened welded plate at the end of the beam-to-beam angled filler plate; 11. Beam-to-beam straight filler plate; 12. Beam-to-beam square filler plate; 13. Beam-to-column diagonal brace; 14. Bolt; 15. Wall joists. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only some, not all, of the embodiments of the present invention. All embodiments based on the present invention fall within the protection scope of the present invention.

[0022] In the description of this invention, it should be noted that, unless otherwise specified, the materials used in the structural system of this invention are not limited to steel. Galvanized steel, stainless steel, aluminum alloy, copper, wood, or other feasible materials are all within the scope of protection of this invention.

[0023] In the description of this invention, it should be understood that the terms "irregular shape," "extended," "upper and lower," "longitudinal," "horizontal and longitudinal," "corner," "inner," "outer," and "between columns," etc., indicate the orientation or positional relationship based on the methods or positional relationships shown in the accompanying drawings. They are for ease of description only and are not intended to indicate or imply that the indicated position or element must have a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "single limb," "closed," "open," "irregular C-shape," "extended rolled edge," "straight line," "cross," "oblique angle," "filler plate," and "auxiliary plate," etc., are for ease of description only and are not intended to indicate or imply that the indicated structure or component must have a specific form. All other component forms that can adopt the novel connection nodes disclosed in this invention are within the scope of protection of this invention.

[0024] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings: This invention provides a fully bolted modular cold-formed steel frame beam-column connection node in the form of a node, and two frame structure systems constructed from the fully bolted modular cold-formed steel frame beam-column connection node. The beam-column nodes in the node area employ inter-column cross-shaped node plates, column-centered cross-shaped auxiliary plates, and inter-beam diagonal bracing for coordinated connection, enabling faster and more efficient transportation and installation. Based on the node splicing construction requirements, unit module frames can be assembled. Figure 18 and the second unit module framework Figure 26 The diagrams show the splicing of the facade unit module frames at the top and bottom, as well as the splicing between the planar unit module frames, to meet the requirements of a multi-layer, multi-span modular frame structure. Example 1

[0025] Example 1 adopts modular and assembly-type splicing, such as Figure 18 The unit module framework shown is composed of six column units and upper and lower beam units connecting the six column units. The column units are complete composite columns, and the upper and lower beam units correspond to the lower double-limb beam and upper double-limb beam of the four-limb irregular C-shaped composite beam, respectively. Each complete composite column is pre-installed with an inter-column cross-shaped node plate and a column-center cross-shaped auxiliary plate.

[0026] The inter-column cross-shaped node plate and the column-mounted cross-shaped auxiliary plate are pre-installed on the upper layer of unit module frame one. When the upper and lower unit module frames one are spliced, the upper unit module frame one is directly placed vertically on the corresponding external inter-column cross-shaped node plate of the lower unit module frame one, such as... Figure 25 And connected into complete nodes by bolts; when splicing planar parts, such as Figure 19 , Figure 20 Since each unit module frame is equipped with a cross-shaped node plate between columns and a cross-shaped auxiliary plate in the column, adjacent unit module frames are connected by an upper double-limb irregular C-shaped single-limb beam 7a and / or a lower double-limb irregular C-shaped single-limb beam 7b through the cross-shaped node plate 8 and the cross-shaped auxiliary plate 9 on one side of the node area. The beams and columns are then connected together by diagonal bracing 13 between beams and columns. The specific method is as follows: Figure 24 As shown, to achieve coordination between modularity and assembly; the upper unit module frame 1 is connected to the lower unit module frame 1's top double-limb irregular C-shaped single-limb beam 7b via the bottom double-limb irregular C-shaped single-limb beam 7a through bolts 14; the upper and lower double-limb irregular C-shaped single-limb beams are connected together with the corresponding bolt holes on each irregular C-shaped single-limb beam via the beam inter-beam oblique angle filler plate 10, straight filler plate 11 and square filler plate 12; Figure 19 This is a schematic diagram of the splicing of units along the longitudinal direction of the unit module frame in Example 1. Each unit module frame is connected by the cross-shaped node plate between columns and the cross-shaped auxiliary plate in the column shown in the figure. Figure 20 This is a schematic diagram of the splicing of the unit module frame along both the horizontal and vertical directions in Example 1. Figure 21It is a parallel overlap between adjacent unit module frames. Figure 22 and Figure 23 These are respectively the splicing of one longitudinal unit module frame and one of two transverse unit module frames, and the splicing of one longitudinal unit module frame and one of three transverse unit module frames. The splicing method is that the cross-shaped node plate between the columns and the cross-shaped auxiliary plate in the column on one side of the node area between adjacent unit module frames are spliced ​​by composite beams. Through the above splicing method of unit module frame, a multi-story and multi-span frame structure system of unit module frame can be realized.

[0027] like Figure 3 The fully bolted modular cold-formed steel frame beam-column connection node shown includes two upper and lower composite columns 6, four-limb irregular C-shaped composite beams 7, a cross-shaped node plate between columns 8, a cross-shaped auxiliary plate in the column 9, and a beam-column diagonal brace 13. The upper and lower composite columns 6 and the four-limb irregular C-shaped composite beams 7 are connected by bolts through the cross-shaped node plate between columns 8, the cross-shaped auxiliary plate in the column 9, and the beam-column diagonal brace 13.

[0028] In this embodiment, the composite column 6 in the node configuration is a novel cold-formed steel rolled-edge closed column, such as... Figure 8 As shown, the column consists of four identical single-limb column plates 6a joined together in pairs. Each single-limb column plate 6a is a cold-formed steel plate with an outwardly rolled edge 6b, maintaining a continuous cross-section to form a rectangular column with an outwardly rolled edge. Along the longitudinal direction, bolt holes are drilled at intervals at the grooves 6e of the outwardly rolled edge of the single-limb column plate 6a, and these are connected to bolts 14 via washers 6c. The washers 6c are square steel plates placed between adjacent column limbs, tightly against the inner side of the outwardly rolled edge, with a width consistent with the outwardly rolled edge, and bolt holes are drilled in the center. The user first places two rolled-edge steel plates symmetrically, and then connects them by sequentially passing bolts through the grooves of the outwardly rolled edge and the corresponding bolt holes on the washers. This fully bolted connection avoids on-site welding while ensuring the integrity, strength, stiffness, and stability of the composite column.

[0029] like Figure 8 As shown, in this embodiment, when connecting the upper and lower combined columns 6, four outer angle steels 6f and one inter-column cross-shaped node plate 8 are set in each of the upper and lower layers. The four outer angle steels 6f need to be installed at the corners of the four individual column members in advance. After the two column members steel plates of the lower layer are spliced, one side of the inter-column cross-shaped node plate is tightly attached to the junction of the steel plates and fixed with bolts 14. Then, the remaining two steel plates are connected to the cross plate in sequence to form a whole. The bolt holes of the inter-column cross-shaped node plate are respectively connected to the column members steel plates of the upper and lower combined columns. Then, the upper column members are connected to the reserved holes at the top of the inter-column cross-shaped node plate. After the upper column members are connected to each other, the outer angle steels of the upper and lower columns are connected to form a whole with bolts 14.

[0030] In this embodiment, the composite beam is a four-limb irregular C-shaped composite beam 7 (see 12). It is composed of an upper limb irregular C-shaped single beam 7a and a lower limb irregular C-shaped single beam 7b, forming a four-limb open beam. During installation, the two types of irregular C-shaped single beams, the upper limb irregular C-shaped single beam 7a and the lower limb irregular C-shaped single beam 7b, are first connected vertically with bolts 14 to form a single-sided integral component. Then, the connected single-sided integral components are connected back to back, and the middle is connected together with bolts through the oblique filler plate 10, the straight filler plate 11 and the square filler plate 12.

[0031] Structural participation of inter-column cross-shaped gusset plate 8 Figure 5 It is made of two square plates welded vertically, and the structure of the cross-shaped auxiliary plate 9 in the column is as follows. Figure 6 It is formed by vertically welding two square plates, and the ends of the cross-shaped auxiliary plate in the column are thickened with welding plate 9a. Bolt holes for connecting the composite column 6 and bolt holes for connecting the four-limb irregular C-shaped composite beam 7 are machined on the square plate of the cross-shaped node plate 8 between the columns. The bolt holes for connecting the four-limb irregular C-shaped composite beam 7 include bolt holes for connecting the upper limb irregular C-shaped single beam 7a and bolt holes for connecting the lower limb irregular C-shaped single beam 7b; bolt holes for connecting the composite column 6 and bolt holes for connecting the beam-column diagonal brace 13 are machined on the cross-shaped auxiliary plate 9 in the column.

[0032] The connection method between the composite column 6 and the cross-shaped node plate 8 between the node columns is as follows: the cross-shaped node plate between the node columns is inserted into the splice joint of four cold-formed steel plates and connected by bolts. The connection method between the composite column 6 and the cross-shaped auxiliary plate 9 in the node column is as follows: the cross-shaped auxiliary plate in the node column is inserted into the splice joint of four cold-formed steel plates and connected by bolts; The connection method between the four-limb irregular C-shaped composite beam 7 and the cross-shaped node plate 8 between the nodes is as follows: the cross-shaped node plate between the nodes is inserted into the splice joint of the integral components on both sides of the four-limb irregular C-shaped composite beam and connected by bolts. The connection method between the four-limb irregular C-shaped composite beam 7 and the cross-shaped auxiliary plate 9 in the node column is as follows: the cross-shaped auxiliary plate in the node column is connected to the inclined filler plate between the splicing joints of the integral components on both sides of the four-limb irregular C-shaped composite beam through the diagonal bracing between the beam and the column, and the connecting plate at the end of the diagonal bracing is connected to the opening at the bottom flange of the four-limb irregular C-shaped composite beam by bolts. The connection method between the beam-column diagonal brace 13 and the composite column 6 and composite beam 7 is as follows: the side plates at both ends of the diagonal brace are connected to the corresponding bolt holes on the outer rolled edge of the composite column and the bottom flange of the composite beam, and then connected to the cross-shaped auxiliary plate in the column and the diagonal filler plate between the beams through the bolt holes on the web of the beam-column diagonal brace.

[0033] The four-limbed, irregularly shaped C-shaped composite beam is equipped with end connecting side plates 7c, which are connected to the bolt holes on the extended rolled edge 6b of the composite column via bolts 14. Inter-column cross-shaped node plates 8, column-centered cross-shaped auxiliary plates 9, and beam-column diagonal braces 13 are pre-installed on the upper layer of the unit module frame. Figure 18 Adjacent unit module frames are connected by overlapping corresponding upper or lower irregular C-shaped beams, such as... Figure 24 .

[0034] Adjacent column elements at a node are connected by beam elements perpendicular to it, forming an independent unit module frame, such as... Figure 18 The cross-shaped node plate between columns is pre-installed on the top of the unit module frame, and the end connecting side plate 7c, wall keel 15, and beam-column diagonal brace 13 on the combined beam of the unit module frame serve as frame connection support; it should be noted that the unit module frame uses full columns rather than quarter columns, and the upper and lower beams are respectively double-limb lower irregular C-shaped beams and double-limb upper irregular C-shaped beams.

[0035] When splicing the upper and lower parts by hoisting, such as Figure 25 The upper and lower unit module frames are spliced ​​together by the cross-shaped node plate between the columns in the node area of ​​the lower unit module frame. The irregular C-shaped single-limb beams of each layer are connected together by bolts through the inter-beam oblique fill plate 10, straight fill plate 11 and square fill plate 12 and the corresponding bolt holes on each irregular C-shaped single-limb beam. The irregular C-shaped single-limb beams of the upper and lower layers are further reinforced by bolts 14 through the bolt holes on the inner side of the middle narrow flange. This method can meet the requirements of multi-layer splicing.

[0036] When splicing together adjacent unit modules in a planar frame, such as Figure 19 , Figure 20 Multiple adjacent unit module frames are connected to the corresponding single-layer double-limb beams and beam-column diagonal bracing through the cross-shaped node plate 8 and the cross-shaped auxiliary plate 9 on one side of the node area of ​​each unit module frame, so as to realize the connection between the planar unit module frames; this method can meet the requirements of multi-span splicing.

[0037] It should be noted that the splicing of the unit module frame one is achieved by installing them one by one in pairs according to the form of the node area construction. This unit module frame one can not only increase the number of layers and spans in the longitudinal parallel direction, but also increase the number of layers and spans in both the horizontal and longitudinal directions of the plane. The requirements of the unit module frame one in terms of design form, installation sequence and orientation need to be considered. Example 2

[0038] Example 2 uses a fully modular assembly method, such as... Figure 26The second unit module frame shown also includes six column units and upper and lower beam units connecting them. The column units consist of four quarter-composite columns located at the corners and two half-composite columns located in the middle. The upper and lower beam units correspond to the lower and upper single-limb beams of the four-limb irregular C-shaped composite beams, respectively. None of the six column units in unit module frame two have inter-column cross-shaped gusset plates.

[0039] In this embodiment 2, the second unit module frame adopts the same node form as in embodiment 1, the difference being in the construction and splicing method of the second unit module frame; unlike the first unit module frame in embodiment 1, the second unit module frame in embodiment 2 does not have the inter-column cross-shaped node plate and the column-center cross-shaped auxiliary plate pre-installed. Figure 35 When splicing the upper and lower unit module frames, the upper unit module frame 2 and the lower unit module frame 2 are spliced ​​together through the middle column cross-shaped node plate. At the same time, four unit module frames 2 of Example 2 need to be spliced ​​together to form a complete beam-column node, without the need for additional overlapping between unit module frames 2. When splicing in the plane, since the node areas of each unit module frame 2 do not have column cross-shaped node plates installed, adjacent unit module frames 2 are spliced ​​together through the central column cross-shaped node plate and the column cross-shaped auxiliary plate to achieve integrated modular installation. Figure 27 This is a schematic diagram of the splicing of the second unit module frame along the longitudinal direction of the unit in Example 2. Each second unit module frame is spliced ​​together by the cross-shaped node plate between columns and the cross-shaped auxiliary plate in the column shown in the figure. Four adjacent second unit module frames are spliced ​​together by a cross-shaped node plate between columns 8, a cross-shaped auxiliary plate in the column 9 and the diagonal brace between beam and column 13 to form a complete beam-column node. Figure 28 This is a schematic diagram of the planar splicing along the horizontal and vertical directions of the unit module frame in Example 2. Figure 29 It is a parallel overlap between two adjacent unit module frames. Figure 30 and Figure 31 These are respectively the splicing between a vertical unit module frame 2 and two horizontal unit module frames 2, and the splicing between a vertical unit module frame 2 and three horizontal unit module frames 2; Figure 32 , Figure 33 , Figure 34 The planar splicing process between the unit module frames in Example 2 is shown from different perspectives; the multi-layer, multi-span frame structure system of the unit module frames can be realized through the splicing method of the unit module frames.

[0040] like Figure 26As shown, the second unit module frame adopts the same beam-column joint structure as in embodiment 1. The difference is that the second unit module frame in this embodiment uses quarter-composite columns around its perimeter. The upper and lower beams of the second unit module frame are also half of the lower and upper double-limb irregular C-shaped composite beams of the four-limb irregular C-shaped composite beams, respectively. The frame connection is supported by the end connecting plate 7c of the irregular C-shaped single-limb beam in the second unit module frame and the wall keel 15. Adjacent unit columns at a node are connected by beam elements perpendicular to them, forming an independent unit module frame two, such as... Figure 26 When assembling parts vertically using hoisting, such as... Figure 35 Simultaneously, four embodiment 2 unit module frames are needed to form a complete beam-column node. The upper unit module frame 2 is connected to the lower unit module frame's top irregular C-shaped single-limb beam 7b via bolts 14 to form a single-sided integral component. Then, the beam-to-beam angled filler plate 10, straight filler plate 11, and square filler plate 12 are connected to the corresponding bolt holes on both sides of the integral component via bolts. This method can meet the requirements of multi-layer splicing.

[0041] When splicing two adjacent unit modules in a planar frame, such as Figure 27 , Figure 28 Since no cross-shaped node plate is installed between columns in each unit module frame 2, adjacent unit module frames 2 are spliced ​​together by a centrally placed cross-shaped node plate 8 between columns, a cross-shaped auxiliary plate 9 in the column, and a beam-column diagonal brace 13. The unit module frame also needs to be spliced ​​together by four unit module frames 2 of embodiment 2 to form a complete beam-column node around its perimeter. This method can meet the requirements of multi-span splicing.

[0042] It should be noted that the splicing of the unit module frame is achieved by installing them one by one in pairs according to the form of the node area construction. This unit module frame can not only increase the number of layers and spans in the longitudinal parallel direction, but also increase the number of layers and spans in both the horizontal and longitudinal directions of the plane. The requirements of the unit module frame in terms of design form, installation sequence and orientation need to be considered.

[0043] A fully bolted, modular, cold-formed steel frame structure system, such as Figure 1 As shown, taking a two-story, two-span frame system as an example, this paper introduces the unit module frame and splicing method in the form of full columns and half beams, as well as the unit module frame and splicing method in the form of quarter columns and quarter beams.

[0044] The advantages of this invention are: 1. The modular frame can be prefabricated and bolted together on-site, eliminating the need for welding and welding deformation, resulting in high installation accuracy and a short construction period; 2. It is environmentally friendly and can directly use galvanized steel, stainless steel, or even aluminum alloy without the need for anti-corrosion coating; 3. Multi-limb combined single-limb components can be transported in single-limb stacks, and the modular frame can also be transported directly, making on-site assembly convenient; 4. The novel beam-column cross-section and beam-column node design used in this modular system greatly improve the stiffness and load-bearing capacity of the node area, making it suitable for the building requirements of mid-to-high-rise steel structures. The composite columns can also be further strengthened by pouring concrete; 5. It has excellent cross-sectional form and flexible spatial arrangement, facilitating later maintenance and replacement; 6. The modular frame system proposed in this invention can also directly use steel, copper, wood, or other materials without the need for anti-corrosion coating, making it environmentally friendly, offering a wide range of choices and applications.

[0045] The four-limb irregular C-shaped composite beam 7 has an irregular C-shaped single-limb beam with wide flange 7d and narrow flange 7e of narrow flange 7e of narrow flange 7d ...

[0046] Finally, it should be noted that: 1. The dimensions shown in the accompanying drawings are for reference only and do not represent the actual scale. The actual dimensions of the components may vary depending on the specific implementation method and manufacturing requirements.

[0047] 2. The accompanying drawings only show a partial schematic of the wall keel support of the unit frame. The remaining keel structure of the unit frame, not shown, is similar to the portion shown and also exists in actual implementation. For simplicity, only a partial schematic is provided to more clearly demonstrate the key features of the invention. Please refer to this description for a complete understanding of the invention.

[0048] 3. The reference portions in the accompanying drawings do not show key components such as wall panels and floors within the unit frame. In actual implementation, the unit frame includes these components and plays a crucial role in the implementation of the invention. The drawings only show a partial schematic of the unit frame to more clearly illustrate the core features of the invention. Please refer to this description for a full understanding of the invention.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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. A fully bolted precast beam-column joint, characterized in that: It includes two composite columns, four-limb irregular C-shaped composite beams, a cross-shaped node plate between columns in a node area, a cross-shaped auxiliary plate in the column in a node area, and diagonal bracing between beams and columns; the two composite columns and the four-limb irregular C-shaped composite beams are connected by bolts through the cross-shaped node plate between columns in the node area, the cross-shaped auxiliary plate in the column, and the diagonal bracing between beams and columns. The composite column is made up of four identical single-limb column plates with outward rolled edges spliced ​​together in pairs, maintaining a continuous cross-section to form a rectangular cross-section column with outward rolled edges; the cold-formed steel plate has bolt holes at intervals along the longitudinal direction at the outward rolled edges, and is connected to the bolts by a backing plate; The composite beam is a four-limb irregular C-shaped single-limb beam connection. The four-limb irregular C-shaped composite beam consists of two upper irregular C-shaped single-limb beams and two lower irregular C-shaped single-limb beams. One upper irregular C-shaped single-limb beam and one lower irregular C-shaped single-limb beam are connected to form a single-sided integral component. The two single-sided integral components are connected back to back. The cross-shaped node plate between the nodes is formed by vertically welding two square plates. Bolt holes for connecting the composite columns and bolt holes for connecting the four-limb irregular C-shaped composite beams are machined on the square plates of the cross-shaped node plate between the nodes. The bolt holes for connecting the four-limb irregular C-shaped composite beams include bolt holes for connecting the upper irregular C-shaped single beams and bolt holes for connecting the lower irregular C-shaped single beams. The flat filler plates between composite beams in the node include angled filler plates, square filler plates and straight filler plates; bolt holes for connecting the upper and lower composite beams are machined on each filler plate, and bolt holes for connecting the diagonal braces between beams and columns are also machined on the angled filler plates; The connection method of the cross-shaped gusset plate between the composite column and the node column is as follows: the cross-shaped gusset plate between the node columns is inserted into the splice joint of four cold-formed steel plates and connected by bolts; The cross-shaped auxiliary plates in composite columns and node columns are connected as follows: the cross-shaped auxiliary plates in the node columns are inserted into the splice joint of four cold-formed steel plates and connected by bolts. The connection method between the four-limb irregular C-shaped composite beam and the cross-shaped node plate between the nodes is as follows: the cross-shaped node plate between the nodes is inserted into the splice joint of the two symmetrical single-sided integral components of the four-limb irregular C-shaped composite beam, and is connected by bolts. The connection method between the four-limb irregular C-shaped composite beam and the cross-shaped auxiliary plate in the node column is as follows: the cross-shaped auxiliary plate in the node column is connected to the diagonal filler plate between the splice joints of the two symmetrical single-sided integral components of the four-limb irregular C-shaped composite beam through the beam-column diagonal bracing, and the connection plate at the end of the diagonal bracing is connected to the opening at the bottom flange of the four-limb irregular C-shaped composite beam by bolts. The connection method between the diagonal brace and the composite column and composite beam is as follows: the side plates at both ends of the diagonal brace are connected to the corresponding bolt holes on the outer rolled edge of the composite column and the bottom flange of the composite beam, respectively, and then connected to the cross-shaped auxiliary plate in the column and the diagonal filler plate between the beams through the bolt holes on the web of the diagonal brace. When the upper and lower composite columns are connected at the node, four external angle steels are set and placed at the four corners of the composite column, and then bolted to the composite column as one unit; the corresponding bolt holes on the cross-shaped node plate between the node columns are bolted to the openings of the four cold-formed steel plates with the extended rolled edges. The upper-layer irregular C-shaped single-limb beam is larger than the lower-layer irregular C-shaped single-limb beam, and the upper flange width of the upper-layer irregular C-shaped single-limb beam is greater than the lower flange width; the lower flange width of the lower-layer irregular C-shaped single-limb beam is greater than the upper flange width; the upper and lower flange widths of the upper-layer irregular C-shaped single-limb beam are consistent with the lower and upper flange widths of the lower-layer irregular C-shaped single-limb beam, respectively, and the upper and lower single-limb beams are spliced ​​together by bolts at the flanges, and then the two single-sided integral components are connected back to back by bolts to form a back-to-back open composite beam.

2. A fully bolted assembled steel frame structure, characterized in that: It is assembled from the fully bolted prefabricated beam-column joint as described in claim 1.

3. The all-bolted assembled steel frame structure according to claim 2, characterized in that: The fully bolted prefabricated beam-column joint assembly method includes: Method 1: First, a unit module frame 1 is assembled from six column units, upper and lower beam units connecting the six column units, and cross-shaped node plates and cross-shaped auxiliary plates set on the six column units. The column units are complete composite columns. The upper and lower beam units in the unit module frame 1 correspond to the lower double-limb beam and upper double-limb beam of the four-limb irregular C-shaped composite beam, respectively. The splicing between unit module frames 1 is achieved through the cross-shaped node plates and cross-shaped auxiliary plates in the node areas of adjacent unit module frames 1. The unit module frames 1 are installed sequentially according to the structural requirements of the node areas. This method can realize bidirectional splicing between units.

4. The all-bolted assembled steel frame structure according to claim 2, characterized in that: The fully bolted prefabricated beam-column joint assembly method includes: Method 2: First, six column units and upper and lower beam units connecting the six column units are assembled into a unit module frame 2; wherein the column unit includes four quarter-combination columns located at the corners and two half-combination columns located in the middle; the upper and lower beam units in unit module frame 2 correspond to the lower single-limb beam and upper single-limb beam of the four-limb irregular C-shaped composite beam respectively; unit module frame 2 does not have pre-installed inter-column cross-shaped node plates and column-mounted cross-shaped auxiliary plates; The second unit module frame is installed sequentially according to the structural requirements of the node area. Each single-limb column and single-limb beam is connected to the single-limb column through the bolt holes of the side plate at the end of the single-limb beam, and further reinforced by the wall keel. This method can also realize free splicing between the unit module frames in both horizontal and vertical directions.

5. A prefabricated building, characterized in that, Includes the fully bolted steel frame structure as described in any one of claims 2-4.

6. The prefabricated building according to claim 5, characterized in that, The hoisting method for the first type of fully bolted prefabricated beam-column joint assembly is as follows: the inter-column cross-shaped node plate and the column-in-column cross-shaped auxiliary plate are pre-installed on the first unit module frame. When splicing the upper and lower units, the first unit module frame is directly placed vertically on the corresponding external inter-column cross-shaped node plate in the node area of ​​the first unit module frame. The splicing of the upper and lower units module frames is completed by bolts. When splicing in the plane, adjacent units module frames are respectively connected into one unit by the inter-column cross-shaped node plate, the column-in-column cross-shaped auxiliary plate, the single-layer double-limb composite beam, and the beam-column diagonal bracing on one side of the node area.

7. The prefabricated building according to claim 5, characterized in that, The hoisting method for the second type of fully bolted prefabricated beam-column joint assembly is as follows: When assembling the upper and lower units by hoisting, the upper unit module frame 2 is connected to the lower unit module frame 2 by bolts through the bottom irregular C-shaped single-limb beam and the top irregular C-shaped single-limb beam of the lower unit module frame 2 to form a single-sided integral component. Then, the beam is connected to the other side of the integral component between the adjacent units by bolts through the inter-beam I-shaped filler plate, square filler plate and oblique filler plate. When assembling in the plane, the adjacent unit module frames 2 are respectively spliced ​​into a whole by the centrally placed cross-shaped node plate and the cross-shaped auxiliary plate in the column, and the support is further strengthened by the diagonal bracing between the beam and column and the wall keel.

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