Fabricated steel reinforced concrete beam-column joint capable of being provided with friction damping component

Abstract

The embodiment of the invention provides an assembly type steel reinforced concrete beam column joint capable of being provided with a friction damping component, and relates to the technical field of civil construction structures. The fabricated steel reinforced concrete beam column joint comprises a prefabricated concrete column, a prefabricated concrete beam, a cross-shaped steel rib, I-shaped steel, a lower end plate, a first plug pin end plate, a high-strength bolt, a second plug pin end plate, a friction damper, an embedded steel pipe, an end plate body, a column steel reinforcement framework and a beam steel reinforcement framework. A cross-shaped steel rib is pre-buried in the precast concrete column, a pre-buried steel pipe penetrates through the cross-shaped steel rib and extends to the outer side of the column, and the two ends of the pre-buried steel pipe are welded to the second plug pin end plate and the end plate body respectively. By arranging the built-in friction dampers and connecting the prefabricated beam columns through the dry type bolts and the high-strength bolts, the fabricated steel reinforced concrete structural system is good in joint anti-seismic performance, high in energy dissipation capacity, convenient to construct, convenient to repair after an earthquake and suitable for high-rise areas and areas where earthquakes occur frequently.

Description

Technical Field

[0001] The present application relates to the technical field of civil engineering and building structures, and in particular to an assembled steel-concrete beam-column node that can be equipped with a friction damping component. Background Art

[0002] In modern construction, prefabricated steel-concrete structures, combining the excellent mechanical properties of steel with the compressive strength of concrete, have been widely used in structures such as high-rise buildings, bridges, and industrial plants. These structures not only possess a high load-bearing capacity, capable of withstanding significant axial pressure and tension, but also effectively reduce component size while maintaining structural strength, leveraging the respective advantages of steel and concrete to enhance overall structural performance.

[0003] However, in actual engineering applications, the key to prefabricated steel-concrete structures lies in the design and construction quality of their connection structures. Nodes are important parts of the structural system that transmit internal forces and coordinate deformations. Their performance directly determines the bearing capacity and seismic performance of the entire frame structure. Traditional prefabricated steel-concrete nodes mostly use a wet connection method, which involves welding steel components on-site and then pouring concrete to form an integral connection. This construction method has many problems: on the one hand, steel welding operations are usually completed on-site, with a large amount of welding and a long construction period. Especially in high-rise buildings, high-altitude welding operations are highly dangerous and construction quality is difficult to effectively control. On the other hand, the amount of wet work on-site is large and is significantly affected by environmental factors, which is not conducive to achieving the goals of green construction and industrialized construction.

[0004] In order to overcome the above problems, dry connection methods have gradually attracted attention in recent years. Dry connection does not rely on on-site welding and concrete pouring. It has the advantages of convenient construction, high assembly efficiency, and detachable replacement. It is especially suitable for engineering projects with high requirements for construction quality and construction period. Among them, the pin connection is a representative dry connection form. It uses the pin end plates on the prefabricated components to achieve rapid docking and uses high-strength bolts to enhance the shear bearing capacity of the nodes, which significantly improves construction efficiency and safety. On this basis, in order to further improve the seismic performance of the nodes, some studies have proposed to build in friction damping devices at the pins to weaken the impact of seismic action on the structure through the friction energy dissipation mechanism, so that the nodes have good energy dissipation capabilities while maintaining a high bearing capacity.

[0005] Although some research results have been achieved, the actual promotion and application process still faces problems such as complex node structure, unstable energy consumption performance, and poor replaceability.

[0006] In view of this, an assembled steel-concrete beam-column joint with friction damping components is proposed to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a prefabricated steel-concrete beam-column node with a friction damping component. In order to solve the problems of complex construction, serious damage, low construction efficiency, poor seismic performance of traditional prefabricated concrete structures, and weak core areas of the nodes in existing concrete beam-column nodes, the node connects precast concrete beams and columns through pins and high-strength bolts, which is convenient for disassembly and replacement after damage; by adjusting the external friction material of the friction damping plate, the fullness of the node hysteresis curve is changed, and the energy consumption capacity of the node is improved. For this purpose, an prefabricated steel-concrete beam-column node with a friction damping component is proposed.

[0008] According to an embodiment of the present application, an assembled steel-concrete beam-column node with a friction damping component includes a precast concrete column, a precast concrete beam, a cross-shaped steel frame, an I-shaped steel, a lower end plate, a first latch end plate, high-strength bolts, a second latch end plate, a friction damper, an embedded steel pipe, an end plate body, a column reinforcement skeleton, and a beam reinforcement skeleton;

[0009] A cross-shaped steel frame is embedded in the precast concrete column, and the embedded steel pipe is passed through the cross-shaped steel frame and extends to the outside of the column, and the two ends are welded to the second latch end plate and the end plate body respectively. An I-shaped steel is embedded in the precast concrete beam, and a part of the I-shaped steel is located in the precast concrete beam, and the other part extends out of the precast concrete beam and is welded to the first latch end plate. A friction damper is arranged inside the second latch end plate, and the first latch end plate is vertically inserted into the second latch end plate, and is connected and fixed by high-strength bolts and the sliding groove on the friction damper. The lower end plate is welded to the lower side of the second latch end plate as a limiting structure.

[0010] Furthermore, a plurality of circular holes are provided on the flange plate of the cross-shaped steel frame at equal intervals, and the embedded steel pipes pass through the circular holes and are welded and fixed to the cross-shaped steel frame.

[0011] Furthermore, the friction damper comprises, from the inside to the outside, a corrugated metal friction damping plate, elastic rubber 1 and friction material 1.

[0012] Furthermore, the contact surfaces of the first latch end plate and the second latch end plate are in mutually matching corrugated structures, which match the corrugated structure of the friction damping plate.

[0013] Furthermore, the high-strength bolts include at least two sets of bolt pairs, the bolt holes are correspondingly opened at the edge positions of the first and second latch end plates, and the friction damping plate is provided with a sliding groove allowing the high-strength bolts to pass through.

[0014] Furthermore, the embedded steel pipe is coated with friction material 2 and elastic rubber 2 from the inside to the outside.

[0015] Furthermore, a column reinforcement skeleton is provided inside the precast concrete column, and the column reinforcement skeleton is arranged around a cross-shaped steel frame.

[0016] Furthermore, a beam reinforcement skeleton is provided inside the precast concrete beam, and the beam reinforcement skeleton is arranged around the I-shaped steel.

[0017] Furthermore, the cross-shaped steel frame and I-shaped steel are both made of Q345 low-alloy high-strength structural steel.

[0018] Furthermore, the concrete strength grade of the precast concrete columns is not less than C40, the concrete strength grade of the precast concrete beams is not less than C35, the longitudinal stress-bearing steel bars of the beams and columns are HRB335 and above grade steel bars, and the stirrups are HPB300 steel bars.

[0019] The beneficial effects of the present application are as follows: by arranging a built-in friction damper in the node and using dry-type latches and high-strength bolts to achieve rapid connection of prefabricated beams and columns, the problems of complex construction of traditional cast-in-place nodes, poor seismic performance of prefabricated nodes, easy damage to the core area of the node, and low construction efficiency are effectively solved. The node has a reasonable structure, and the friction damper consists of a corrugated metal friction plate, elastic rubber and friction material, which can significantly improve the energy consumption capacity and ductility of the node. By adjusting the thickness or type of the friction material, the hysteresis performance of the node can be flexibly controlled, so that it has good self-resetting ability and stable energy dissipation performance under earthquake action; at the same time, the latch end plates are connected by detachable high-strength bolts, which is convenient for replacing damaged components after the earthquake, thereby improving the maintainability and reliability of the node. Sustainability, cross-shaped steel frames and I-shaped steel frames are embedded in prefabricated columns and beams respectively, and a stable force transmission path is formed by welding embedded steel pipes to end plates. Combined with the column reinforcement skeleton and beam reinforcement skeleton arranged around the steel, the overall strength and ductility of the node are further enhanced. All components adopt standardized design, which is convenient for factory prefabrication and on-site assembly, which significantly improves construction efficiency and reduces the risk of high-altitude operations. In addition, the embedded steel pipes are coated with friction materials and elastic rubber, which not only enhances the fatigue resistance of the node, but also improves its adaptability and durability in complex environments; the overall structure has high strength, good seismic performance and convenient construction characteristics, which is suitable for prefabricated concrete structure systems in high-rise buildings, bridges and earthquake-prone areas, and has good engineering application prospects.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic diagram of the overall structure according to an embodiment of the present application;

[0023] Figure 2 According to the embodiment of this application Figure 1 Schematic diagram of the structure from above;

[0024] Figure 3 This is a schematic diagram of the disassembly of the structures of the latch end plate 1 and the latch end plate 2 according to an embodiment of the present application;

[0025] Figure 4 is a schematic structural diagram of a friction damping plate, etc. according to an embodiment of the present application;

[0026] Figure 5 According to the embodiment of this application Figure 4 Schematic diagram of the structure's disassembly;

[0027] Figure 6 This is a schematic diagram of the structure of the embedded steel pipe according to an embodiment of the present application;

[0028] Figure 7 is a schematic cross-sectional view of the structure of the embedded steel pipe, etc. according to an embodiment of the present application;

[0029] Figure 8 This is a schematic diagram of a cross-shaped steel frame structure according to an embodiment of the present application.

[0030] Icons: 1. Precast concrete column; 2. Precast concrete beam; 3. Cross-shaped steel frame; 31. Round hole; 4. I-beam; 5. Lower end plate; 6. Latch end plate 1; 7. High-strength bolt; 8. Latch end plate 2; 9. Friction damping plate; 10. Embedded steel pipe; 11. End plate body; 12. Friction material 1; 13. Elastic rubber 1; 14. Column steel frame; 15. Beam steel frame; 16. Friction material 2; 17. Elastic rubber 2. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0032] An assembled steel-concrete beam-column node with a friction damping component according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0033] like Figures 1-8As shown, according to an embodiment of the present application, an assembled steel-concrete beam-column node with a friction damping component is mainly composed of a precast concrete column 1, a precast concrete beam 2, a cross-shaped steel frame 3, an I-shaped steel 4, a lower end plate 5, a latch end plate 6, a high-strength bolt 7, a latch end plate 2 8, a friction damper, an embedded steel pipe 10, an end plate body 11, a friction material 12, an elastic rubber 13, a column steel frame 14, and a beam steel frame 15. The beams and columns are both cast with steel bars and concrete. The precast concrete column 1 and the precast concrete beam 2 are both prefabricated in the factory and assembled on-site using a dry latch connection method, which significantly improves construction efficiency and reduces the risk of high-altitude welding operations. The node structure is suitable for assembled steel-concrete structural systems of high-rise buildings, bridges and earthquake-prone areas, and has the advantages of convenient construction, excellent seismic performance, and easy post-earthquake repair.

[0034] The precast concrete column 1 is cast with high-performance concrete with a strength grade of no less than C40, and a cross-shaped steel frame 3 is embedded inside it as the main load-bearing component. The cross-shaped steel frame 3 is composed of flanges extending in four directions, forming a spatially stable force-bearing structure, which significantly improves the overall stiffness and load-bearing capacity of the column. To enhance the stability of the force transmission path, a plurality of circular holes 31 are opened at equal intervals on the flange plate of the cross-shaped steel frame 3 for inserting embedded steel pipes 10. The embedded steel pipes 10 pass through the above-mentioned circular holes 31 and are welded to the cross-shaped steel frame 3, further enhancing the overall connection stiffness and node force transmission efficiency.

[0035] Both ends of the embedded steel pipe 10 extend to the outside of the precast concrete column 1 and are welded to the pin end plate 2 8 and the end plate body 11 respectively, forming a stable external connection fulcrum, ensuring that the node can effectively transmit internal force and maintain structural stability during the stress process.

[0036] In addition, inside the precast concrete column 1, a column steel frame 14 is arranged around the cross-shaped steel frame 3, which is composed of longitudinal force-bearing longitudinal bars and transverse stirrups. The longitudinal bars are arranged along the column height, and the stirrups are set at intervals along the column cross-section, which play a role in restraining concrete, enhancing shear resistance and seismic ductility, and further improving the ductility of the column and the overall structural safety.

[0037] Precast concrete beam 2 is made of concrete with a strength grade of at least C35 and features an internal I-beam 4, one portion of which is embedded within the beam body and the other portion of which extends outward and is welded to latch end plate 1 6. Latch end plate 1 6 is provided with bolt holes for subsequent connection with latch end plate 2 8, enabling rapid assembly.

[0038] Inside the precast concrete beam 2, a beam reinforcement skeleton 15 is arranged around the I-shaped steel 4. The skeleton is also composed of longitudinal stress-bearing longitudinal bars and transverse stirrups to improve the overall bearing capacity and seismic performance of the beam.

[0039] Furthermore, the key innovation of this application lies in the use of a dry-type latch connection method, combined with a built-in friction damper to achieve efficient energy consumption and convenient assembly. Replacing traditional wet welding joints with dry-type connections not only significantly reduces on-site wet work and the risks of high-altitude welding, but also improves construction efficiency and assembly precision, making it particularly suitable for large-scale application in industrialized construction models.

[0040] Specifically, latch end plate 1 (6) is vertically inserted into latch end plate 2 (8), forming a stable plug-in structure. Latch end plate 2 (8) has a groove inside, with a depth of 80 to 120 mm, for embedding the friction damper. From the inside out, the friction damper comprises, in order: a corrugated metal friction damping plate (9), elastic rubber (13), and friction material (12), wherein:

[0041] The corrugated metal friction damping plate 9 has good energy dissipation capacity and can generate stable sliding energy dissipation under earthquake or dynamic load;

[0042] The thickness of the elastic rubber 13 is about 1 mm, and it is mainly used for buffering and isolating high-frequency vibrations;

[0043] The thickness of the friction material 12 is controlled between 1 and 2 mm, and the friction coefficient is set to 0.3 to 0.4 to ensure stability during the friction energy consumption process;

[0044] The friction damper is provided with a slide groove with a length of 10 to 20 mm, which is used for the high-strength bolt 7 to pass through and adjust the initial sliding force, thereby achieving flexible regulation of the node hysteresis performance.

[0045] The contact surface between the latch end plate 1 6 and the latch end plate 2 8 is designed as a matching corrugated structure, which is consistent with the corrugated shape of the friction damping plate 9, with a peak height of 20 to 30 mm and a wavelength of 80 to 100 mm. This structural design not only increases the friction contact area, but also enhances the bite force between the interfaces, thereby improving the overall energy consumption capacity and connection reliability of the node.

[0046] A lower end plate 5 is welded to the underside of the second latch end plate 8, acting as a retaining structure to prevent the latch from dislodging and enhance shear resistance. At least two sets of high-strength bolts 7 are installed at the edges of the latch end plates. Bolt holes are located in corresponding locations on the first and second latch end plates 6 and 8, respectively. The friction damping plate 9 is equipped with slots to allow the high-strength bolts 7 to pass through, facilitating on-site assembly and subsequent replacement.

[0047] In addition, in order to further improve the shock absorption performance and fatigue life of the node, the embedded steel pipe 10 is coated with elastic rubber 17 and friction material 16, which are coated from the inside to the outside to form a multi-layer composite buffer structure, effectively reducing stress concentration problems caused by temperature changes, vibrations or earthquakes.

[0048] Among all the steel components, the cross-shaped steel frame 3, I-shaped steel 4, latch end plate 1 6, latch end plate 2 8, end plate body 11 and lower end plate 5 are all made of Q345 low-alloy high-strength structural steel to ensure the overall strength and rigidity of the node; the high-strength bolts 7 use 10.9-grade high-strength bolts to ensure the anti-slip performance and reliability of the connection node under earthquake action; the friction damping plate 9 is made of low-yield point steel, which is convenient for post-earthquake replacement, realizing the replaceable energy-consuming function of the node, and greatly improving the sustainability and maintenance convenience of the structure.

[0049] When the node is subjected to dynamic loads (such as earthquakes), the friction damper begins to play an energy-absorbing role. As the load increases, the relative sliding between the friction materials increases, and the energy-absorbing efficiency gradually increases. Under the action of the ultimate load, the friction damper yields first, causing the plastic hinge to move outward from the core area of the node, effectively reducing damage to the core area and avoiding overall structural failure. Since the friction damper is located outside the node, after the earthquake, the damaged friction damping plate 9 can be replaced by removing the high-strength bolts 7, thereby quickly restoring the node's seismic performance, realizing an assembled steel-concrete beam-column node that is convenient to construct, has excellent seismic performance, and is easy to maintain after an earthquake.

[0050] In summary, the working principle of an assembled steel-concrete beam-column node with friction damping components is as follows: a cross-shaped steel frame 3 is embedded in the precast concrete column 1, a circular hole 31 is provided on the flange plate of the cross-shaped steel frame 3, and a pre-embedded steel pipe 10 passes through the circular hole 31 and is welded to the cross-shaped steel frame 3, and the two ends of the pre-embedded steel pipe 10 are respectively welded to the latch end plate 2 8 and the end plate body 11 to form an external connection fulcrum; an I-shaped steel 4 is provided in the precast concrete beam 2, one end of which extends out of the beam body and is welded to the latch end plate 1 6; during on-site installation, the latch end plate 1 6 is vertically inserted into the latch end plate 2 8, and a groove is provided inside the latch end plate 2 8 for embedding a friction damper, which is composed of a corrugated metal friction damping plate, an elastic rubber 13 and a friction material 12. The contact surface between 1-6 and the latch end plate 2-8 is a matching corrugated structure and has the same shape as the friction damping plate 9. The connection and fixation are achieved by passing through the latch end plate 1-6, the latch end plate 2-8 and the slide groove on the friction damper through the high-strength bolt 7. The lower end plate 5 is welded to the lower side of the latch end plate 2-8 as a limit structure to prevent the latch from falling out. The embedded steel pipe 10 is covered with elastic rubber 2-17 and friction material 2-16 to enhance the shock absorption performance. All steel components are made of Q345 low-alloy high-strength steel, the high-strength bolt 7 is made of 10.9 grade bolt, and the friction damping plate 9 is made of low-yield point steel. When the node is subjected to dynamic load, the friction damper produces interface slip under the action of the pre-tightening force provided by the high-strength bolt 7, thereby realizing energy dissipation and completing the mechanical transmission and energy consumption functions of the node.

[0051] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may be subject to various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0052] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A prefabricated steel-concrete beam-column joint with a friction damping component, characterized in that: It comprises a precast concrete column (1), a precast concrete beam (2), a cross-shaped steel frame (3), an I-shaped steel (4), a lower end plate (5), a first latch end plate (6), high-strength bolts (7), a second latch end plate (8), a friction damper, a pre-buried steel pipe (10), an end plate body (11), a column steel frame (14) and a beam steel frame (15); A cross-shaped steel frame (3) is embedded in the precast concrete column (1), and a pre-embedded steel pipe (10) is passed through the cross-shaped steel frame (3) and extends to the outside of the column, and the two ends are welded to the second latch end plate (8) and the end plate body (11) respectively. The precast concrete beam (2) has an I-shaped steel (4) embedded therein, a part of the I-shaped steel (4) is located in the precast concrete beam (2), and the other part extends out of the precast concrete beam (2) and is welded to the first latch end plate (6). A friction damper is arranged inside the second latch end plate (8), and the first latch end plate (6) is vertically inserted into the second latch end plate (8), and is connected and fixed by high-strength bolts (7) and the sliding groove on the friction damper. The lower end plate (5) is welded to the lower side of the second latch end plate (8) as a limiting structure.

2. The prefabricated steel-concrete beam-column joint with friction damping components according to claim 1 is characterized in that: A plurality of circular holes (31) are provided at equal intervals on the flange plate of the cross-shaped steel frame (3); the embedded steel pipe (10) passes through the circular holes (31) and is welded and fixed to the cross-shaped steel frame (3).

3. The assembled steel-concrete beam-column joint with friction damping components according to claim 2 is characterized in that: The friction damper comprises, from the inside to the outside, a corrugated metal friction damping plate (9), an elastic rubber (13) and a friction material (12).

4. The assembled steel-concrete beam-column joint with friction damping components according to claim 3 is characterized in that: The contact surfaces of the first latch end plate (6) and the second latch end plate (8) are in mutually matching corrugated structures, matching the corrugated structure of the friction damping plate (9).

5. The assembled steel-concrete beam-column joint with friction damping components according to claim 1 is characterized in that: The high-strength bolts (7) include at least two sets of bolt pairs, the bolt holes are correspondingly opened at the edge positions of the first latch end plate (6) and the second latch end plate (8), and the friction damping plate (9) is provided with a sliding groove allowing the high-strength bolts (7) to pass through.

6. The assembled steel-concrete beam-column joint with friction damping components according to claim 5, characterized in that: The embedded steel pipe (10) is coated with friction material (16) and elastic rubber (17) from the inside to the outside.

7. The assembled steel-concrete beam-column joint with friction damping components according to claim 1 is characterized in that: A column reinforcement skeleton (14) is provided inside the precast concrete column (1), and the column reinforcement skeleton (14) is arranged around the cross-shaped steel frame (3).

8. The assembled steel-concrete beam-column joint with friction damping components according to claim 7 is characterized in that: A beam reinforcement skeleton (15) is provided inside the precast concrete beam (2), and the beam reinforcement skeleton (15) is arranged around the I-shaped steel (4).

9. The assembled steel-concrete beam-column joint with friction damping components according to claim 8, characterized in that: The cross-shaped steel frame (3) and the I-shaped steel (4) are both made of Q345 low-alloy high-strength structural steel.

10. The assembled steel-concrete beam-column joint with friction damping components according to claim 9, characterized in that: The concrete strength grade of the precast concrete column (1) is not less than C40, the concrete strength grade of the precast concrete beam (2) is not less than C35, the longitudinal stress-bearing steel bars of the beam and column are HRB335 and above grade steel bars, and the stirrups are HPB300 steel bars.

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