A prefabricated concrete frame structure system and construction method

Abstract

This application discloses a prefabricated concrete frame structure system and construction method, including: precast columns, precast beams, foundations, beam-column energy dissipation connections, column-column steel connection components, and column-foundation energy dissipation connections. The precast columns include precast upper columns and precast lower columns, which are connected by the column-column steel connection components and connecting reinforcing bars. The precast columns are connected to the precast beams via beam-column energy dissipation connections, and the precast columns are connected to the foundation via column-foundation energy dissipation connections. The prefabricated concrete frame structure system provided by this application can achieve energy dissipation through relative sliding at the concave-convex interface of the precast upper and lower columns under seismic loading, energy dissipation through compression deformation at the column-foundation energy dissipation connection, and energy dissipation through compression deformation of the horizontal energy dissipation and reset components in the beam-column energy dissipation connection. The hyperelastic behavior of the SMA bolts provides restoring force. All components are prefabricated in the factory, making installation convenient and detachable.

Description

Technical Field

[0001] This disclosure generally relates to the field of prefabricated building technology, and specifically to a prefabricated concrete frame structure system and construction method. Background Technology

[0002] Prefabricated structures can significantly avoid harsh working environments, reduce labor intensity, and decrease pollution at construction sites. They also offer advantages such as rapid construction, high quality stability, and environmental friendliness, leading to their increasing application in practical engineering. However, existing prefabricated concrete frame structures primarily rely on damage to the main structural members to dissipate seismic energy, often resulting in significant residual deformation after an earthquake. Furthermore, the complex construction and high precision requirements of the reinforcement connections in joint areas and between prefabricated components, often necessitating complex on-site processes such as sleeve grouting and grout-anchored lap joints, have become a key bottleneck restricting their application. To address these issues, there is an urgent need to develop a prefabricated concrete frame system that is easy to construct and possesses both energy dissipation and repositioning capabilities, aiming to achieve rapid assembly and improve the seismic performance of the structure.

[0003] The purpose of this invention is to provide a prefabricated concrete frame structure system to overcome the problems existing in the prior art, making the structure easy to assemble and improving the seismic performance of the structure. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a prefabricated concrete frame structure system and construction method that is easy to assemble and has energy-consuming reset capability.

[0005] In a first aspect, a prefabricated concrete frame structure system includes: precast columns, precast beams, foundations, beam-column energy-dissipating connections, column-column steel connection components, and column-foundation energy-dissipating connections; the precast columns include precast upper columns and precast lower columns, the precast upper columns and the precast lower columns are connected by the column-column steel connection components and connecting reinforcing bars, the precast columns are connected to the precast beams by the beam-column energy-dissipating connections, and the precast columns are connected to the foundations by the column-foundation energy-dissipating connections.

[0006] According to the technical solution provided in the embodiments of this application, the precast beam has an I-beam embedded at its beam end, and the energy-dissipating connection between the beam and the column includes a first vertical connecting plate, a second vertical connecting plate, a diagonal web, and a horizontal energy-dissipating reset component; the first vertical connecting plate is welded to the column top steel sleeve of the precast column, and the second vertical connecting plate is welded to the I-beam of the precast beam; the diagonal web is welded to the first vertical connecting plate and the second vertical connecting plate, and the horizontal energy-dissipating reset component is horizontally arranged and welded to the first vertical connecting plate and the second vertical connecting plate.

[0007] According to the technical solution provided in the embodiments of this application, the lower end of the precast upper column is connected to a steel sleeve A, the longitudinal reinforcing bar of the precast upper column extends into the reserved hole A of the steel sleeve A, and the bottom of the steel sleeve A is provided with a concave-convex surface A; the upper end of the precast lower column is connected to a steel sleeve B, the longitudinal reinforcing bar of the precast lower column extends into the reserved hole B of the steel sleeve B, and the bottom of the steel sleeve A is provided with a concave-convex surface B.

[0008] According to the technical solution provided in the embodiments of this application, the column-to-column steel connection assembly includes U-shaped steel A and U-shaped steel B. The end of U-shaped steel A is provided with a protruding lug plate A and a recessed hole A, and the end of U-shaped steel B is provided with a protruding lug plate B and a recessed hole B. U-shaped steel A and U-shaped steel B are placed outside steel sleeve A and steel sleeve B, and U-shaped steel A and U-shaped steel B are butted together. The protruding lug plate A is inserted into the matching recessed hole B, and the protruding lug plate B is inserted into the matching recessed hole A. U-shaped steel A and U-shaped steel B are bolted to steel sleeve A and steel sleeve B by SMA bolts.

[0009] According to the technical solution provided in the embodiments of this application, the protruding portion of the concave-convex surface A is paired with the recessed portion of the concave-convex surface B, and the recessed portion of the concave-convex surface A is paired with the protruding portion of the concave-convex surface B, so that the concave-convex surface A and the concave-convex surface B can be in close contact.

[0010] According to the technical solution provided in the embodiments of this application, the column and foundation energy dissipation connection includes an upper horizontal connecting plate and a lower horizontal connecting plate, a vertical elastic connection, an oblique connection, and a diagonal connection; the upper horizontal connecting plate is welded to the column bottom steel sleeve of the precast lower column, and the lower horizontal connecting plate is pre-embedded in the top of the foundation; the vertical elastic connection, oblique connection, and diagonal connection are connected to the upper horizontal connecting plate and the lower horizontal connecting plate; the diagonal connection has a bending angle in the middle; the oblique connection includes an outer sleeve and a steel frame.

[0011] According to the technical solution provided in the embodiments of this application, the steel frame is disposed inside the outer sleeve, four vertical elastic connections are disposed, perpendicular to the upper horizontal connecting plate and located at the corners; the oblique connections are disposed between two adjacent vertical elastic connections and are obliquely disposed; the diagonal connections are disposed between two opposite vertical elastic connections.

[0012] Secondly, a construction method for a prefabricated concrete frame structure system includes the following steps: S1: Precast columns, precast beams, foundations, beam-column energy-dissipating connections, column-column steel connection components, and column-foundation energy-dissipating connections are prefabricated in the factory. S2: The precast column and the foundation are connected by a welded energy-dissipating connection between the column and the foundation; S3: The connecting steel bar is placed in the reserved hole B of the precast lower column, and after the precast upper column is placed, it is bolted to the column and column steel connection assembly. S4: The precast column and the precast beam are welded together via the energy-dissipating connection between the beam and the column.

[0013] In summary, this application discloses a prefabricated concrete frame structure system. Based on the specific technical solution described above, the prefabricated upper and lower columns of this invention are provided with concave and convex surfaces and are connected by U-shaped steel and SMA bolts. When no earthquake occurs, the prefabricated upper and lower columns are subjected to the preload of the SMA bolts after being snapped together by U-shaped steel A and U-shaped steel B. Under minor earthquakes, the frame does not slip between the prefabricated upper and lower columns under external loads. Under moderate to major earthquakes, the concave and convex interfaces of the prefabricated upper and lower columns slide relative to each other, dissipating earthquake energy through friction. The SMA bolts provide preload, and the hyperelastic behavior of the SMA bolts provides restoring force, which can reduce the residual deformation of the structure. By changing the inclination angle of the concave and convex surfaces, the bending bearing capacity of the prefabricated columns can be improved.

[0014] The precast columns and foundations of this invention are assembled through an energy-dissipating connection between the columns and foundations. Under axial pressure and horizontal seismic action, the combined action of vertical elastic connection, oblique connection and diagonal connection generates compressive deformation to dissipate energy, converting mechanical energy into elastic potential energy. After the seismic action, the elastic potential energy is transferred to the upper horizontal connecting plate and the lower horizontal connecting plate, and the structure returns to its position before deformation.

[0015] The precast columns and beams of this invention are assembled via beam-to-column energy-dissipating connections. The diagonal webs effectively resist shear forces under external loads, and the horizontal energy-dissipating and restoring components effectively dissipate energy during earthquakes through compression deformation, while springs provide restoring force. The precast columns, beams, and foundations of this invention are assembled via column-to-column steel connection components, beam-to-column energy-dissipating connections, and column-to-foundation energy-dissipating connections, respectively, making installation convenient and detachable. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 The diagram shown is a structural schematic of a prefabricated concrete frame structure system. Figure 2 The diagram shown is a schematic of the prefabricated upper column structure; Figure 3 The diagram shown is a structural schematic of the prefabricated lower column; Figure 4 The diagram shown is a structural schematic of the steel connection assembly between columns; Figure 5 The diagram shown is a schematic of the connection structure between the precast upper column and the precast lower column; Figure 6 The diagram shown is a schematic of the energy-dissipating connection between the column and the foundation. Figure 7 The diagram shown is a schematic of the energy-dissipating connection between the beam and the column. Figure 8 The diagram shown is a schematic of the horizontal energy-dissipating reset component.

[0017] The diagram labels are as follows: 10. Precast column; 11. Precast upper column; 111. Steel sleeve A; 112. Reserved hole A; 113. Concave-convex surface A; 12. Precast lower column; 121. Steel sleeve B; 122. Reserved hole B; 123. Concave-convex surface B; 13. Connecting reinforcement; 14. Steel sleeve at the bottom of the column; 15. Steel sleeve at the top of the column; 20. Precast beam; 21. I-beam; 30. Foundation; 40. Energy-dissipating connection between beam and column; 41. First vertical connecting plate; 42. Second vertical connecting plate; 43. Diagonal web; 44. Horizontal energy-dissipating reset assembly. Components; 441, Outer cylinder; 442, Inner cylinder; 443, Spring; 444, Connecting rod; 50, Steel connection assembly between columns; 51, U-shaped steel A; 511, Protruding ear plate A; 512, Recessed hole A; 52, U-shaped steel B; 521, Protruding ear plate B; 522, Recessed hole B; 53, SMA bolt; 60, Energy-dissipating connection between column and foundation; 61, Upper horizontal connecting plate; 62, Lower horizontal connecting plate; 63, Vertical elastic connection; 64, Diagonal connection; 65, Diagonal connection; 641, Outer sleeve; 642, Steel frame. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Please refer to Figures 1-8 This application provides a prefabricated concrete frame structure system, comprising: precast columns 10, precast beams 20, foundations 30, beam-column energy-dissipating connections 40, column-column steel connection components 50, and column-foundation energy-dissipating connections 60; the precast columns 10 include precast upper columns 11 and precast lower columns 12, which are connected by the column-column steel connection components 50 and connecting steel bars 13; the precast columns 10 are connected to the precast beams 20 by the beam-column energy-dissipating connections 40; and the precast columns 10 are connected to the foundations 30 by the column-foundation energy-dissipating connections 60.

[0021] In a prefabricated concrete frame structure system provided in this application, the precast beam 20 has an I-beam 21 embedded at its beam end. The beam-column energy dissipation connection 40 includes a first vertical connecting plate 41, a second vertical connecting plate 42, a diagonal web 43, and a horizontal energy dissipation and reset component 44. The first vertical connecting plate 41 is welded to the column top steel sleeve 15 of the precast column 10, and the second vertical connecting plate 42 is welded to the I-beam 21 of the precast beam 20. The diagonal web 43 is welded to the first vertical connecting plate 41 and the second vertical connecting plate 42. The horizontal energy dissipation and reset component 44 is horizontally arranged and welded to the first vertical connecting plate 41 and the second vertical connecting plate 42. The diagonal web can effectively resist the shear force under external loads, and the horizontal energy dissipation and reset component can effectively dissipate the energy under seismic action through compression deformation, while the spring can provide restoring force. The horizontal energy-dissipating and resetting assembly includes an outer cylinder 441, an inner cylinder 442, a spring 443, and a connecting rod 444. The inner cylinder 442 is welded to the connecting rod 444. The connecting rod 444 is located inside the inner cylinder 442, with one end connected to the spring 443 and the other end connected to the second vertical connecting plate 42. One end of the outer cylinder 441 is welded to the first vertical connecting plate 41. When compressed, the connecting parts and the inner cylinder cause the spring to compress and deform, dissipating energy. After the force is removed, the spring returns to its original shape.

[0022] In a preferred embodiment, please refer to Figure 2 and Figure 3 The lower end of the precast upper column 11 is connected to a steel sleeve A111, and the longitudinal reinforcing bars of the precast upper column 11 extend into the reserved hole A112 of the steel sleeve A111. The bottom of the steel sleeve A111 is provided with a concave-convex surface A113. The upper end of the precast lower column 12 is connected to a steel sleeve B121, and the longitudinal reinforcing bars of the precast lower column 12 extend into the reserved hole B122 of the steel sleeve B121. The bottom of the steel sleeve A121 is provided with a concave-convex surface B123.

[0023] In the column-to-column steel connection assembly of this application, please refer to Figure 4The column-to-column steel connection assembly 50 includes U-shaped steel A51 and U-shaped steel B52. The end of U-shaped steel A51 is provided with a protruding lug plate A511 and a recessed hole A512. The end of U-shaped steel B52 is provided with a protruding lug plate B521 and a recessed hole B522. U-shaped steel A51 and U-shaped steel B52 are positioned outside of steel sleeves A111 and B121, and are joined together. The protruding lug plate A511 is inserted into the matching recessed hole B522, and the protruding lug plate B521 is inserted into the matching recessed hole A512. U-shaped steel A51 and U-shaped steel B52 are bolted to steel sleeves A111 and B121 via SMA bolts 53. This invention features precast upper and lower columns with concave and convex surfaces, connected by U-shaped steel and SMA bolts. In the absence of an earthquake, the precast upper and lower columns are preloaded by the SMA bolts after being engaged by U-shaped steel A and U-shaped steel B. Under minor earthquakes, no slippage occurs between the precast upper and lower columns under external loads. Under moderate to major earthquakes, relative slippage occurs at the concave and convex interfaces of the precast upper and lower columns, dissipating seismic energy through friction. The magnitude of the sliding friction changes in the same direction as the seismic action. The SMA bolts provide preload, and their hyperelastic behavior provides restoring force, reducing residual deformation of the structure. By changing the inclination angle of the concave and convex surfaces, the bending bearing capacity of the precast columns can be improved.

[0024] In a preferred embodiment, please refer to Figure 2 , Figure 3 and Figure 5 The protruding portion of the concave-convex surface A113 is paired with the recessed portion of the concave-convex surface B123, and the concave-convex surface A113 and the concave-convex surface B123 are paired with each other, so that the concave-convex surface A113 and the concave-convex surface B123 can be in close contact.

[0025] In the column-to-foundation energy dissipation connection of this application, please refer to... Figure 6The column-foundation energy-dissipating connection 60 includes an upper horizontal connecting plate 61 and a lower horizontal connecting plate 62, a vertical elastic connection 63, an oblique connection 64, and a diagonal connection 65. The upper horizontal connecting plate 61 is welded to the column base steel sleeve 14 of the precast lower column 12, and the lower horizontal connecting plate 62 is embedded in the top of the foundation 30. The vertical elastic connection 63, the oblique connection 64, and the diagonal connection 65 are connected to the upper horizontal connecting plate 61 and the lower horizontal connecting plate 62. The diagonal connection 65 has a bend in the middle. The oblique connection 64 includes an outer sleeve 641 and a steel frame 642. The steel frame 642 is set inside the outer sleeve 641. Four vertical elastic connections 63 are provided, perpendicular to the upper horizontal connecting plate 61 and located at the corners. The oblique connection 64 is set between two adjacent vertical elastic connections 63 and is obliquely arranged. The diagonal connection 65 is set between two opposite vertical elastic connections 63. Under axial pressure and horizontal seismic action, the combined action of vertical elastic connection, diagonal connection and diagonal connection generates compressive deformation to dissipate energy, converting mechanical energy into elastic potential energy. After the seismic action, the elastic potential energy is transferred to the upper horizontal connection plate and the lower horizontal connection plate, and the structure returns to its position before deformation.

[0026] To obtain the prefabricated concrete frame structure system described in the above embodiments, this application also provides a specific implementation step of a construction method for the prefabricated concrete frame structure system, namely: including the following steps: S1: Prefabricated columns 10, prefabricated beams 20, foundations 30, beam-column energy-dissipating connections 40, column-column steel connection components 50, and column-foundation energy-dissipating connections 60 are prefabricated in the factory. S2: The precast column 10 and the foundation 30 are welded together via the column-foundation energy dissipation connection 60; S3: The connecting steel bar 13 is placed in the reserved hole B122 of the precast lower column 12, and after the precast upper column 11 is placed, it is bolted to the column-to-column steel connection assembly 50. S4: The precast column 10 and the precast beam 20 are welded together via the beam-column energy dissipation connection 40.

[0027] In summary, the structural system of this invention integrates energy dissipation through relative sliding between the concave and convex interfaces of the precast upper and lower columns, energy dissipation through compression deformation of the column-foundation energy dissipation connection, energy dissipation through horizontal compression deformation of the horizontal energy dissipation and reset component in the beam-column energy dissipation connection, and the restoring force provided by the hyperelastic behavior of the SMA screw. All components are prefabricated in the factory, making installation convenient and detachable.

[0028] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A prefabricated concrete frame structure system, characterized in that: include: Precast columns (10), precast beams (20), foundations (30), beam-column energy dissipation connection (40), steel connection components between columns (50), and column-foundation energy dissipation connection (60). The precast column (10) includes a precast upper column (11) and a precast lower column (12). The precast upper column (11) and the precast lower column (12) are connected by the column-to-column steel connection assembly (50) and the connecting steel bar (13). The precast column (10) is connected to the precast beam (20) by the beam-to-column energy dissipation connection (40). The precast column (10) is connected to the foundation (30) by the column-to-foundation energy dissipation connection (60).

2. The prefabricated concrete frame structure system according to claim 1, characterized in that: The precast beam (20) has an I-beam (21) embedded at its beam end. The beam-column energy dissipation connection (40) includes a first vertical connecting plate (41), a second vertical connecting plate (42), a diagonal web plate (43), and a horizontal energy dissipation reset component (44). The first vertical connecting plate (41) is welded to the column top steel sleeve (15) of the precast column (10), and the second vertical connecting plate (42) is welded to the I-beam (21) of the precast beam (20). The diagonal web plate (43) is welded to the first vertical connecting plate (41) and the second vertical connecting plate (42). The horizontal energy dissipation reset component (44) is horizontally arranged and welded to the first vertical connecting plate (41) and the second vertical connecting plate (42).

3. The prefabricated concrete frame structure system according to claim 1, characterized in that: The lower end of the precast upper column (11) is connected to a steel sleeve A (111), and the longitudinal steel bars of the precast upper column (11) extend into the reserved hole A (112) of the steel sleeve A (111). The bottom of the steel sleeve A (111) is provided with a concave-convex surface A (113). The upper end of the precast lower column (12) is connected to a steel sleeve B (121), and the longitudinal steel bars of the precast lower column (12) extend into the reserved hole B (122) of the steel sleeve B (121). The bottom of the steel sleeve A (121) is provided with a concave-convex surface B (123).

4. The prefabricated concrete frame structure system according to claim 1, characterized in that: The column-to-column steel connection assembly (50) includes a U-shaped steel A (51) and a U-shaped steel B (52). The end of the U-shaped steel A (51) is provided with a protruding lug plate A (511) and a recessed hole A (512). The end of the U-shaped steel B (52) is provided with a protruding lug plate B (521) and a recessed hole B (522). The U-shaped steel A (51) and the U-shaped steel B (52) are placed on the steel sleeve A (111) and the steel sleeve B. (121) On the outside, the U-shaped steel A (51) and the U-shaped steel B (52) are joined together, the protruding ear plate A (511) is inserted into the matching recessed hole B (522), and the protruding ear plate B (521) is inserted into the matching recessed hole A (512); the U-shaped steel A (51), U-shaped steel B (52) are bolted to the steel sleeve A (111) and steel sleeve B (121) by SMA screws (53).

5. A prefabricated concrete frame structure system according to claim 3, characterized in that: The raised portion of the concave-convex surface A (113) is paired with the recessed portion of the concave-convex surface B (123), and the recessed portion of the concave-convex surface A (113) is paired with the raised portion of the concave-convex surface B (123). The concave-convex surface A (113) and the concave-convex surface B (123) can be in close contact.

6. A prefabricated concrete frame structure system according to claim 1, characterized in that: The column and foundation energy dissipation connection (60) includes an upper horizontal connecting plate (61) and a lower horizontal connecting plate (62), a vertical elastic connection (63), an oblique connection (64) and a diagonal connection (65); the upper horizontal connecting plate (61) is welded to the column bottom steel sleeve (14) of the precast lower column (12), and the lower horizontal connecting plate (62) is embedded in the top of the foundation (30); the vertical elastic connection (63), the oblique connection (64) and the diagonal connection (65) are connected to the upper horizontal connecting plate (61) and the lower horizontal connecting plate (62); the diagonal connection (65) has a bending angle in the middle; the oblique connection (64) includes an outer sleeve (641) and a steel frame (642).

7. A prefabricated concrete frame structure system according to claim 6, characterized in that: The steel frame (642) is located inside the outer sleeve (641). Four vertical elastic connections (63) are provided, which are perpendicular to the upper horizontal connecting plate (61) and located at the corners. The oblique connection (64) is provided between two adjacent vertical elastic connections (63) and is obliquely provided. The diagonal connection (65) is provided between two opposite vertical elastic connections (63).

8. A prefabricated concrete frame structure system, constructed using the prefabricated concrete frame structure system described in any one of claims 1-7, characterized in that: Includes the following steps: S1: Precast columns (10), precast beams (20), foundations (30), beam-column energy dissipation connections (40), column-column steel connection components (50), and column-foundation energy dissipation connections (60) are prefabricated in the factory. S2: The precast column (10) and the foundation (30) are welded together by the column-foundation energy dissipation connection (60); S3: The connecting steel bar (13) is placed in the reserved hole B (122) of the precast lower column (12), and after the precast upper column (11) is placed, it is bolted to the column and column steel connection assembly (50). S4: The precast column (10) and the precast beam (20) are welded together by the beam-column energy dissipation connection (40).

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