A fully built-in engineering bamboo structure friction energy dissipation beam-column joint

Abstract

This invention relates to a fully integrated engineering bamboo structure friction energy-dissipating beam-column joint. The engineering bamboo column has a through groove along the X direction and grooves on its two sides along the Y direction. The ends of the engineering bamboo beams have slots, and grooves with smaller areas are formed on both sides of the slots. Insert plates pass through the through grooves of the engineering bamboo column and are accommodated at both ends in the slots of the engineering bamboo beams on both sides. Friction plates are fixedly located in grooves. T-shaped plates are embedded in grooves and are fixedly connected to the insert plates and engineering bamboo columns by through bolts. The engineering bamboo beams are connected to the T-shaped plates by bolts. Corresponding parts of the T-shaped plates and insert plates inserted into the slots are provided with an array of centrally symmetrical oval bolt holes, and a circular bolt hole is located at the center of the oval bolt holes. A rotation gap is reserved between the engineering bamboo beams and the engineering bamboo columns. Guided by the oval bolt holes and positioned by the circular bolt holes, the engineering bamboo beams, together with the friction plates, can rotate controllably relative to the engineering bamboo columns around the fixing bolts.

Description

Technical Field

[0001] This invention relates to an engineering bamboo structure node, specifically a fully built-in engineering bamboo structure friction energy dissipation beam-column node, belonging to the field of civil engineering technology. Background Technology

[0002] Engineered bamboo structures, as a green, renewable, and low-carbon building structure, have been increasingly applied in the construction engineering field in recent years. Engineered bamboo possesses advantages such as high strength, high stiffness, and light weight, but there are still areas for improvement in joint connections, fire resistance, and seismic performance. Beam-column joints are critical components of engineered bamboo structures, and their connection performance directly affects the overall structural safety, durability, and seismic performance. With the current shift in structural seismic design concepts towards resilience design, joints not only need sufficient load-bearing capacity but also good deformation and energy dissipation capabilities to ensure the structure has a good safety reserve under extreme conditions such as earthquakes and fires.

[0003] Traditional bamboo structural beam-column joints in engineering often use metal connectors such as angle steel, T-shaped steel, and connecting steel plates, which are bolted together to form a single unit. While these joints are simple in construction and convenient to install, the metal connectors are usually exposed on the outside of the bamboo components. This affects the overall aesthetics of the bamboo structure, and the exposed metal parts are prone to corrosion in humid environments, impacting the durability of the joint. More problematic is that metal connectors have good thermal conductivity, allowing them to heat up rapidly under fire and form heat conduction channels. This heat is transferred to the bamboo in the joint area, accelerating the bamboo carbonization process and causing the joint to experience premature degradation of its load-bearing capacity in a fire. Furthermore, traditional joints are mostly semi-rigid connections, with limited rotational capacity. Under seismic loads, they cannot effectively dissipate seismic energy through joint deformation, failing to meet the requirements of structural toughness design.

[0004] To improve the seismic performance of bamboo structural joints, existing research has introduced friction dampers into engineering bamboo structural joints, dissipating seismic energy through the frictional slippage of the dampers. However, existing friction energy dissipation joints still have certain limitations. First, friction dampers are usually placed on the outside of the joint or at the support location, occupying building space, and the exposed dampers have poor aesthetic coordination with the bamboo structure. Second, existing friction energy dissipation joints often do not fully consider safety performance under fire conditions; the dampers and connecting bolts are exposed, and during a fire, heat conduction accelerates the charring of the surrounding bamboo. On the other hand, to meet the rotation requirements of the joint, a rotation gap is usually required at the joint, but this gap may become a channel for flames and high-temperature gases to enter the interior of the joint (causing deformation of the joint's metal components at high temperatures). Current technology lacks a structural solution that can both meet the requirements of joint rotation and energy dissipation and effectively achieve fireproof sealing.

[0005] In recent years, some existing technologies have attempted to conceal joints by embedding metal connectors within bamboo components. For example, this involves slotting the ends of bamboo beams, embedding steel plates, and then connecting them with bolts. While these embedded joints can improve the structural appearance to some extent and provide some protection for the metal connectors, they are typically only used for conventional load-bearing connections. They lack friction energy dissipation capabilities and do not consider fireproofing and fire protection under joint rotation clearance conditions, making it difficult to simultaneously meet the requirements of structural seismic toughness and fire resistance design.

[0006] In summary, existing bamboo structure beam-column joints still suffer from problems such as exposed metal components, insufficient fire resistance, limited energy dissipation capacity, and difficulty in achieving structural toughness design. How to achieve integrated joint connection components, maintain the overall aesthetics of the structure, while ensuring good energy dissipation capacity and fire resistance, and meeting structural toughness design and fire safety requirements, is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0007] This invention aims to overcome the problems of exposed metal parts, insufficient fire resistance, and limited energy dissipation capacity in existing engineering bamboo structure beam-column joints. It provides a fully built-in engineering bamboo structure friction energy dissipation beam-column joint. This joint completely integrates metal connectors and friction energy dissipation components inside the bamboo component, achieving both aesthetic appeal and excellent seismic energy dissipation and fire resistance, thus meeting the requirements of structural toughness design.

[0008] The present invention adopts the following technical solution:

[0009] A fully integrated engineering bamboo structure friction energy-dissipating beam-column joint includes an engineering bamboo column 1, an engineering beam 2, and also includes an insert plate 3, a friction plate 4, and a T-shaped plate 5. The engineering bamboo column 1 is a rectangular column, with the direction perpendicular to one pair of sides in a virtual three-dimensional space being the X-direction and the direction perpendicular to the other pair of sides being the Y-direction. The engineering bamboo column 1 has a through groove 11 along the X-direction and grooves 12 on its two sides along the Y-direction. The engineering bamboo beam 2 has a slot 21 at its end, and grooves 22 with a smaller area than the slot 21 are formed on both sides from the slot 21. The insert plate 3 passes through the through groove 11 of the engineering bamboo column 1 and is accommodated at both ends in the slots 21 of the engineering bamboo beams on both sides. The friction plate 4 is fixedly located in the grooves 22. The T-shaped plate 5 is embedded in the groove 12 and is fixedly connected to the insert plate 3 and the engineering bamboo column 1 by through bolts; the engineering bamboo beam 2 is connected to the T-shaped plate 5 by bolts; the corresponding parts of the T-shaped plate 5 and the insert plate 3 inserted into the groove 21 are provided with an array of centrally symmetrical sliding oval bolt holes 54 and 31, and the center of the sliding oval bolt holes 54 and 31 is provided with circular bolt holes 55 and 32; a rotation gap 6 is reserved between the engineering bamboo beam 2 and the engineering bamboo column 1; under the guidance of the sliding arc bolt holes 54 and 31 and the positioning of the circular bolt holes 55 and 32, the engineering column beam 2 together with the friction plate 4 can rotate controllably relative to the engineering bamboo column 1, and the rotation angle is limited by the length of the oval holes 54 and 31.

[0010] Preferably, the rotation gap 6 is filled with graphite-expanded flexible fireproof filler.

[0011] Preferably, the surface of the engineering bamboo beam 2 is provided with countersunk bolt holes 23, and the engineering bamboo beam 2, the insert plate 3 and the friction plate 4 are connected by bolts passing through the countersunk bolt holes 23.

[0012] Furthermore, the countersunk bolt hole 23 is sealed with organic fireproof sealant.

[0013] Furthermore, the root of the bolt is provided with an elastic compensation member for adjusting the preload.

[0014] Furthermore, the elastic compensation component is a spring washer, a disc spring, or an elastic washer, used to provide continuous preload in the bolted connection, so that a stable normal pressure is formed between the friction plate 4 and the insert plate 3, thereby avoiding insufficient clamping of the friction pair due to the excessive size of the groove 22 or processing errors, which would affect the energy dissipation performance.

[0015] Furthermore, an assembly allowance is provided between the size of the second groove 22 and the thickness of the friction plate 4, and adaptive adjustment is achieved through bolt pre-tightening and the deformation of the elastic compensation component to ensure that the friction pair can form reliable contact under different machining accuracy conditions.

[0016] Preferably, the insert plate 3 is a steel plate with three rows of bolt holes: the first row has three sliding oval bolt holes 31; the second row has a centrally located circular bolt hole 32 and two symmetrically arranged sliding oval bolt holes 31; and the third row has three sliding oval bolt holes 31 symmetrically arranged with the first row. A fixed bolt passes through the circular bolt hole 32, serving as the center of node rotation. The sliding oval bolt hole 31 is an oval hole centered on the fixed bolt, with the sliding bolt passing through it. When the beam and column rotate relative to each other, the insert plate 3 and the T-shaped plate 5 generate relative displacement through the friction plate 4, and the sliding bolt slides along the sliding oval bolt hole 31, achieving frictional energy dissipation. The length L of the sliding oval bolt hole 31 satisfies: L = R × θ + d + Δ, where R is the distance from the sliding bolt to the fixed bolt, θ is the target rotation angle, d is the diameter of the sliding bolt, and Δ is the reserved gap at both ends of the sliding oval bolt hole 31.

[0017] Preferably, the insert plate 3 has a set of bolt holes 33 in the middle, which are fixedly connected to the engineering bamboo column 1 by bolts. The height of the insert plate 3 is slightly less than the height of the slot 21, so that when the beam end rotates, the insert plate 3 will not protrude from the surface of the engineering bamboo beam 2, and will always remain fully embedded.

[0018] Preferably, the friction plate 4 is a copper-based powder metallurgy friction material, disposed on both sides of the insert plate 3, and accommodated in the groove 22 of the engineering bamboo beam 2, and connected to the engineering bamboo beam 2 and the insert plate 3 through the bolt holes 41 thereon; the T-shaped plate 5 is a steel plate, which is welded from a first steel plate 51 embedded in the engineering bamboo column 1 and a second steel plate 53 inserted into the engineering bamboo beam 2; the first steel plate 51 has countersunk bolt holes 52 for fixed connection with the engineering bamboo column 1, and the countersunk bolt holes 52 are filled with organic fireproof sealant for sealing; the second steel plate 53 has the same structure as the insert plate 3, and has sliding oval bolt holes 54 and circular bolt holes 55 respectively. To ensure symmetry and consistency between the rotation and energy dissipation mechanisms on both sides of the node; the rotation gap 6 between the engineering bamboo column 1 and the engineering bamboo beam 2 is filled with graphite-expanded flexible fireproof filler; the graphite-expanded flexible fireproof filler is pre-compressed and embedded, and its thickness before compression is greater than the width of the rotation gap 6, relying on the compression and rebound force of the material itself to tightly adhere to the bamboo surface on both sides of the gap; at room temperature, the filler remains flexible, allowing the node to deform during rotation without hindering the relative movement of the beam and column; when exposed to fire, the filler expands in volume, forming a dense carbonized layer, sealing the rotation gap 6, preventing flames and high-temperature gases from entering the interior of the node, and providing effective fire protection for the built-in metal parts.

[0019] Compared with existing technologies, this invention achieves full integration of metal connectors and energy-dissipating components, maintaining the overall appearance and aesthetics of the bamboo structure. When the beams and columns rotate relative to each other, the nodes can be stabilized and dissipate energy through the sliding friction plates, transforming the brittle splitting failure of bamboo in traditional nodes into the ductile slippage of the friction plates. After an earthquake, only the friction plates and sliding bolts need to be replaced to restore the node function, significantly improving the post-earthquake repairability and toughness design level of engineering bamboo structures. The graphite-expanded flexible fireproof filler filling the rotation gap expands and seals the gap when exposed to fire, significantly improving the fire resistance limit of the node. At the same time, the parameters of the oval bolt holes (arc holes) can be flexibly designed according to seismic requirements, and each component adopts modular assembly, which is convenient for construction and suitable for industrial production. Attached Figure Description

[0020] Figure 1 This is an assembly diagram of the fully built-in engineering bamboo structure friction energy dissipation beam-column joint of the present invention;

[0021] Figure 2 This is an exploded schematic diagram of the friction energy dissipation beam-column joint of the fully built-in engineering bamboo structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the bamboo pillars used in the project.

[0023] Figure 4 This is a schematic diagram of the bamboo beams used in the project.

[0024] Figure 5 This is a schematic diagram of the insert plate;

[0025] Figure 6 This is a schematic diagram of the friction plate;

[0026] Figure 7 This is a schematic diagram of a T-shaped plate;

[0027] Figure 8 Schematic diagram of the rotational clearance of the beam-column joint Figure 1 ;

[0028] Figure 9 Schematic diagram of the rotational clearance of the beam-column joint Figure 2 ;

[0029] Figure 10 This is a schematic diagram of the beam-column joint before rotation, viewed from the first perspective.

[0030] Figure 11 This is a schematic diagram of the beam-column joint after rotation from a first-person perspective.

[0031] Figure 12 This is a schematic diagram of the beam-column joint before rotation, viewed from a second perspective.

[0032] Figure 13 This is a schematic diagram of the beam-column joint after rotation from a second-view perspective.

[0033] In the diagram: 1. Engineering bamboo column; 11. Through groove; 12. Groove I; 2. Engineering bamboo beam; 21. Slot; 22. Groove II; 23. Countersunk bolt hole; 3. Insert plate; 31. Sliding oval bolt hole I; 32. Fixed circular bolt hole I; 33. Bolt hole; 4. Friction plate; 41. Bolt hole; 5. T-shaped plate; 51. First steel plate; 52. Countersunk bolt hole; 53. Second steel plate; 54. Sliding oval bolt hole II; 55. Fixed circular bolt hole II; 6. Rotation clearance. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-9 As shown, this embodiment provides a fully built-in engineering bamboo structure friction energy dissipation beam-column joint, including an engineering bamboo column 1 and an engineering bamboo beam 2.

[0036] The engineering bamboo 1 has a through groove 11 and a first groove 12, and the end of the engineering bamboo beam 2 has a slot 21 and a second groove 22. The insert plate 3 passes through the through groove 11 of the engineering bamboo column 1, and the two ends of the insert plate 3 are respectively accommodated in the slots 21 of the engineering bamboo beams on both sides.

[0037] Two copper-based powder metallurgy friction plates 4 are respectively disposed on both sides of the insert plate 3 and accommodated in the groove 22 of the engineering bamboo beam 2.

[0038] T-shaped plate 5 is embedded in groove 12 of the engineering bamboo column 1 and is fixedly connected to insert plate 3 and engineering bamboo column 1 by through bolts. Engineering bamboo beam 2 is connected to T-shaped plate 5 by bolts. A rotation gap 6 is reserved between engineering bamboo beam 2 and engineering bamboo column 1, and the gap is filled with graphite-expanded flexible fireproof filler.

[0039] Specifically, the end of the engineering bamboo beam 2 is provided with a through slot 21 to accommodate the insert plate 3, and the two sides of the slot 21 are provided with grooves 22 to accommodate the friction plate 4.

[0040] The surface of the engineering bamboo beam 2 is provided with countersunk bolt holes 23. The engineering bamboo beam 2, the insert plate 3 and the friction plate 4 are fixedly connected by bolts. The countersunk bolt holes 23 are filled with organic fireproof sealant for sealing.

[0041] Furthermore, an elastic compensation component is provided at the bolt connection. The elastic compensation component is located between the contact surface of the nut and the engineering bamboo beam 2. It is used to generate elastic deformation and provide continuous preload during the bolt tightening process, so that a stable normal pressure is formed between the friction plate 4 and the insert plate 3. This ensures that the friction energy dissipation mechanism can still be effectively implemented even when there are processing errors or assembly gaps.

[0042] Preferably, the elastic compensation component is a disc spring, which can be set individually or in multiple stacked pieces to adapt to different preload requirements and compensate for the size deviation of the groove 22 or the thickness error of the friction plate 4.

[0043] like Figure 5 As shown, the core structure for achieving frictional energy dissipation is the insert plate 3, which is a steel plate with three rows of bolt holes. The first row has three sliding oval bolt holes 31, the second row has one fixed circular bolt hole 32 in the center and two symmetrically arranged sliding oval bolt holes 31, and the third row has three sliding oval bolt holes 31 symmetrically arranged with the first row.

[0044] A fixed bolt is inserted into the fixed circular bolt hole 32, serving as the center for node rotation; the sliding oval bolt hole 31 is an oval hole with the fixed bolt as its center, and the sliding bolt is inserted into the sliding oval bolt hole 31.

[0045] To ensure that the bolt can slide smoothly during rotation, the length L of the sliding oval bolt hole 31 satisfies: L=R×θ+d+Δ, where R is the distance from the sliding bolt to the fixed bolt, θ is the target rotation angle, d is the diameter of the sliding bolt, and Δ is the reserved gap at both ends of the arc-shaped hole 31.

[0046] To further ensure the stability of the node during rotation, the insert plate 3 has a bolt hole 33 in the middle, which is fixedly connected to the engineering bamboo column 1 by bolts. The height of the insert plate 3 is slightly less than the height of the slot 21, so that when the beam end rotates, the insert plate 3 will not protrude from the surface of the engineering bamboo beam 2, and will always remain completely embedded.

[0047] The T-shaped plate 5 is a steel plate, welded together from a first steel plate 51 embedded in the engineering bamboo column 1 and a second steel plate 53 inserted into the engineering bamboo beam 2. The first steel plate 51 has countersunk bolt holes 52 for fixed connection with the engineering bamboo column 1, and the countersunk bolt holes 52 are sealed with organic fireproof sealant. The second steel plate 53 has the same structure as the insert plate 3, and has sliding oval bolt holes 54 and fixed circular bolt holes 55 to ensure symmetrical rotation and energy dissipation mechanisms on both sides of the node.

[0048] Combining 10-13, when the beam and column rotate relative to each other, the fixed bolt acts as the center of rotation, and the sliding bolt slides along an arc-shaped trajectory within the sliding oval bolt hole 31, causing relative displacement between the insert plate 3 and the friction plate 4. The sliding stability of the friction plate 4 dissipates seismic energy. Simultaneously, the graphite-expanded flexible fireproof filler filling the rotation gap 6 compresses or rebounds as the gap changes during node rotation, maintaining a tight fit with the bamboo surface. When exposed to fire, the filler expands, forming a dense carbonized layer that seals the rotation gap 6, preventing flames and high-temperature gases from entering the node and providing effective fire protection for the internal metal components.

[0049] During assembly, first, insert plate 3 is inserted through the through groove 11 of the engineering bamboo column 1 and initially fixed. Then, T-shaped plate 5 is embedded in the groove 12 of the engineering bamboo column 1. The T-shaped plate 5, insert plate 3, and engineering bamboo column 1 are fixedly connected by through bolts. The countersunk bolt holes 52 are filled with organic fireproof sealant. Then, friction plate 4 is placed into the groove 22 of the engineering bamboo beam 2. The end of insert plate 3 is inserted into the slot 21 of the engineering bamboo beam 2. The engineering bamboo beam 2, friction plate 4, and insert plate 3 are fixedly connected by bolts through the countersunk bolt holes 23. During the bolt connection process, the nuts and bolts are used to fix the friction plate 4 and the engineering bamboo beam 2. An elastic compensation component is set between the contact surfaces of the engineering bamboo beam 2, and the elastic compensation component is compressed when the bolt is tightened to generate elastic deformation to provide a continuous preload force, thereby ensuring that a stable normal pressure is formed between the friction plate 4 and the insert plate 3; the countersunk bolt hole 23 is filled with organic fireproof sealant, and then the engineering bamboo beam 2 and the second steel plate 53 of the T-shaped plate 5 are fixedly connected; finally, pre-compressed graphite-expanded flexible fireproof filler is embedded in the rotation gap 6 between the engineering bamboo beam 2 and the engineering bamboo column 1, and its rebound force is used to adhere tightly to the surface of the bamboo material to complete the node assembly.

[0050] In this embodiment, the insert plate 3, friction plate 4, T-shaped plate 5, and all connecting bolts and other metal parts are completely embedded inside the engineering bamboo column 1 and engineering bamboo beam 2 through the above-described structure, maintaining the overall appearance and aesthetics of the bamboo structure, while avoiding the corrosion problem of exposed metal parts in humid environments. Through the cooperation of the fixing bolts and the arc-shaped holes, the node can stably dissipate energy through the friction plate 4 when the beam and column rotate relative to each other, meeting the requirements of structural toughness design. Through the graphite-expanded flexible fireproof filler in the rotation gap 6, the node rotation and fireproof function are coordinated. Moreover, each component adopts a modular design, and assembly can be completed by fixing with bolts. The construction precision requirements are controllable, making it suitable for industrial production and on-site assembly.

[0051] In this embodiment, specifically, one side of the engineering bamboo column 1 is connected to the engineering bamboo beam 2 through the through slot 11 via the insert plate 3, and the other side is connected to the engineering bamboo beam 2 by placing a T-shaped plate 5 in the groove 12, forming a symmetrical force system.

[0052] In addition, it should be noted that the "fire resistance performance" of a node refers to its ability to maintain load-bearing capacity and stiffness at high temperatures, not its flame-retardant performance.

[0053] The engineered bamboo in this embodiment includes two types: glued bamboo and reconstituted bamboo.

[0054] Compared with existing technologies, this invention achieves full integration of metal connectors and energy-dissipating components, maintaining the overall appearance and aesthetics of the bamboo structure. When the beams and columns rotate relative to each other, the nodes can be stabilized and dissipate energy through the sliding friction plates, transforming the brittle splitting failure of bamboo in traditional nodes into the ductile slippage of the friction plates. After an earthquake, only the friction plates and sliding bolts need to be replaced to restore the node function, significantly improving the post-earthquake repairability and toughness design level of engineering bamboo structures. The graphite-expanded flexible fireproof filler filling the rotation gap expands and seals the gap when exposed to fire, significantly improving the fire resistance limit of the node. At the same time, the parameters of the oval bolt holes (arc holes) can be flexibly designed according to seismic requirements, and each component adopts modular assembly, which is convenient for construction and suitable for industrial production.

[0055] The above are preferred embodiments of the present invention. Those skilled in the art can make various modifications or improvements based on these embodiments. Without departing from the overall concept of the present invention, such modifications or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A fully built-in engineering bamboo structure friction energy dissipation beam-column joint, comprising engineering bamboo columns (1) and engineering column-beam (2), characterized in that... : It also includes insert plate (3), friction plate (4), and T-shaped plate (5); The engineering bamboo column (1) is a rectangular column. In the virtual three-dimensional space, the direction perpendicular to one pair of sides is the X direction, and the direction perpendicular to the other pair of sides is the Y direction. The engineering bamboo column (1) has a through groove (11) along the X direction and a groove (12) on the two sides along the Y direction. The end of the engineering bamboo beam (2) is provided with a slot (21), and a groove (22) with a smaller area than the slot (21) is provided on both sides from the slot (21). The insert plate (3) passes through the through groove (11) of the engineering bamboo column (1), and its two ends are accommodated in the slots (21) of the engineering bamboo beams (2) on both sides; the friction plate (4) is fixedly located in the second groove (22); The T-shaped plate (5) is embedded in the groove (12) and is fixedly connected to the insert plate (3) and the engineering bamboo column (1) by through bolts; The engineering bamboo beam (2) is connected to the T-shaped plate (5) by bolts; The corresponding parts of the T-shaped plate (5) and the insertion slot (21) of the insert plate (3) are provided with an array of oval bolt holes (54, 31) that are centrally symmetrical, and a circular bolt hole (55, 32) is provided at the center of the oval bolt holes (54, 31). A rotation gap (6) is reserved between the engineering bamboo beam (2) and the engineering bamboo column (1); Guided by the oval bolt holes (54, 31) and positioned by the round bolt holes (55, 32), the entire engineering column beam (2) together with the friction plate (4) can rotate controllably relative to the engineering bamboo column (1), with the rotation angle limited by the length of the oval bolt holes (54, 31).

2. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 1, characterized in that: The rotation gap (6) is filled with graphite-expanded flexible fireproof filler.

3. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 1, characterized in that... The surface of the engineering bamboo beam (2) is provided with countersunk bolt holes (23), and the engineering bamboo beam (2), insert plate (3) and friction plate (4) are connected by bolts passing through the countersunk bolt holes (23).

4. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 3, characterized in that... : The countersunk bolt hole (23) is sealed with organic fireproof sealant.

5. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 3, characterized in that: The root of the bolt is provided with an elastic compensation member for adjusting the preload.

6. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 5, characterized in that... The elastic compensation component is a spring washer, a disc spring or an elastic washer, used to provide continuous preload in bolted connections, so that a stable normal pressure is formed between the friction plate (4) and the insert plate (3), thereby avoiding insufficient clamping of the friction pair due to the excessive size of the groove (22) or processing error, which would affect the energy dissipation performance.

7. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 6, characterized in that: The size of the second groove (22) is provided with an assembly allowance between the size of the groove and the thickness of the friction plate (4), and adaptive adjustment is achieved by bolt pre-tightening and deformation of the elastic compensation component, so as to ensure that the friction pair can form reliable contact under different machining accuracy conditions.

8. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 1, characterized in that: The insert plate (3) is a steel plate with three rows of bolt holes: the first row has three sliding oval bolt holes (31), the second row has a central circular bolt hole (32) and two symmetrically arranged sliding oval bolt holes (31), and the third row has three sliding oval bolt holes (31) symmetrically arranged with the first row; a fixed bolt is inserted into the circular bolt hole (32) as the center of the node rotation; the sliding oval bolt hole (31) is an arc-shaped hole with the fixed bolt as the center, and the sliding bolt is inserted into the sliding oval bolt hole (31); when the beam and column rotate relative to each other, the insert plate (3) and the T-shaped plate (5) generate relative displacement through the friction plate (4), and the sliding bolt slides along the sliding oval bolt hole (31) to realize friction energy dissipation; The length L of the sliding oval bolt hole (31) satisfies: L=R×θ+d+Δ, where R is the distance from the sliding bolt to the fixed bolt, θ is the target rotation angle, d is the diameter of the sliding bolt, and Δ is the reserved gap at both ends of the sliding oval bolt hole (31).

9. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 1, characterized in that: The insert plate (3) has a set of bolt holes (33) in the middle, which are fixedly connected to the engineering bamboo column (1) by bolts. The height of the insert plate (3) is slightly less than the height of the slot (21), so that when the beam end rotates, the insert plate (3) will not protrude from the surface of the engineering bamboo beam (2) and will always remain fully embedded.

10. The fully built-in engineering bamboo structure friction energy dissipation beam-column joint as described in claim 1, characterized in that: The friction plate (4) is a copper-based powder metallurgy friction material, which is set on both sides of the insert plate (3) and accommodated in the groove two (22) of the engineering bamboo beam (2). It is connected to the engineering bamboo beam (2) and the insert plate (3) through the bolt hole (41) on it. The T-shaped plate (5) is a steel plate, which is welded together by a first steel plate (51) embedded in the engineering bamboo column (1) and a second steel plate (53) inserted into the engineering bamboo beam (2); the first steel plate (51) has countersunk bolt holes (52) for fixed connection with the engineering bamboo column (1), and the countersunk bolt holes (52) are filled with organic fireproof sealant for sealing; the second steel plate (53) has the same structure as the insert plate (3), and has sliding oval bolt holes (54) and circular bolt holes (55) respectively to ensure that the rotation and energy consumption mechanism on both sides of the node are symmetrical and consistent; The rotation gap (6) between the engineering bamboo column (1) and the engineering bamboo beam (2) is filled with graphite-expanded flexible fireproof filler. The graphite-expanded flexible fireproof filler is pre-compressed and embedded. Its thickness before compression is greater than the width of the rotation gap (6). It relies on the compression and rebound force of the material itself to stick tightly to the bamboo surface on both sides of the gap. At room temperature, the filler remains flexible, allowing the node to deform when rotating without hindering the relative movement of the beam and column. When exposed to fire, the filler expands in volume to form a dense carbonized layer, sealing the rotation gap (6) and preventing flames and high-temperature gases from entering the node, thus providing effective fire protection for the built-in metal parts.

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