Self-resetting assembly type beam-column joint provided with self-balancing disc spring assembly easy to disassemble and negative poisson ratio energy consumption cover plate

Abstract

The invention provides a self-resetting assembly type beam-column joint provided with a self-balancing disc spring assembly easy to disassemble and a negative Poisson's ratio energy consumption cover plate, which comprises a steel column provided with a cantilever beam section; the steel beam is in butt joint with the cantilever beam section; the built-in flange negative Poisson's ratio energy consumption cover plates are arranged on the inner sides of upper and lower flanges at the butt joint of the steel beam and the cantilever beam section, and the steel beam and the cantilever beam section are connected and fixed through the built-in flange negative Poisson's ratio energy consumption cover plates; the external flange self-balancing disc spring assembly is arranged on the outer sides of the upper flange and the lower flange at the butt joint of the steel beam and the cantilever beam section, and the steel beam and the cantilever beam section are connected and fixed through the external flange self-balancing disc spring assembly; the built-in web self-balancing disc spring assemblies are arranged on the two sides of the web at the butt joint position of the steel beam and the cantilever beam section, and the steel beam and the cantilever beam section are fixedly connected through the built-in web self-balancing disc spring assemblies. According to the self-resetting assembly type beam column joint, the self-resetting function can be achieved, the high ductility of connecting components is ensured, the damage risk of the joint is reduced, and the assembly technology is optimized.

Description

Technical Field

[0001] The present invention relates to the field of building structural engineering, and in particular to a self-resetting assembled beam-column joint for use in frame structures. Specifically, the present invention proposes a self-resetting assembled beam-column joint equipped with an easily removable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate. The joint is suitable for improving the seismic resistance, energy dissipation, and self-resetting capabilities of building structures under earthquake conditions. Background Art

[0002] Steel beam-column joints are the force transmission hubs of steel structural systems. Their seismic performance and resilience are key to ensuring the functional resilience of buildings. Traditional joints have the following bottlenecks:

[0003] Post-earthquake performance suffers from irreversible defects. Existing seismic joints (such as dogbone weakened joints and beam segment reinforced joints) dissipate energy through plastic deformation, but the residual deformation of beams and columns after an earthquake is irreversible, requiring repairs such as partial demolition or complete replacement. External shape memory alloy (SMA) self-resetting devices are costly and lack synergy with joints, making them difficult to implement on a large scale.

[0004] Insufficient shear resistance and energy dissipation capacity. Conventional cover-plate reinforced joints use ordinary steel plates to cover the beam-column connection area. Although this can delay buckling, the positive Poisson's ratio of steel causes lateral expansion under compression, exacerbating stress concentration in the joint area and reducing energy dissipation efficiency. Cover plate tearing or column web shear failure is still prone to occur under strong earthquakes.

[0005] Single function. Existing modular joints (such as end-plate bolted joints) can speed up construction, but lack integrated energy dissipation and self-resetting mechanisms. High-strength bolted joints rely on frictional slippage to dissipate energy, but their energy dissipation capacity is limited and they are prone to stiffness degradation due to preload loss.

[0006] Lack of multi-level energy dissipation capabilities. Seismic motions have random amplitudes, and existing nodes typically use a single energy dissipation path (such as beam end yielding or frictional energy dissipation). This makes it difficult to adapt to the multi-level fortification goals of being resilient to small earthquakes, repairable to moderate earthquakes, and resistant to large earthquakes. Therefore, the introduction of hierarchical, triggered energy dissipation components is urgently needed.

[0007] In view of this, the present invention is proposed. Summary of the Invention

[0008] In response to the above problems, the present invention proposes a self-resetting assembled beam-column node equipped with an easily detachable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate.

[0009] The present invention provides a self-resetting assembled beam-column node configured with an easily detachable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate. The self-resetting assembled beam-column node mainly includes:

[0010] Steel columns with cantilever beam sections, both of which are H-shaped / I-shaped;

[0011] A steel beam, the steel beam being H-shaped or I-shaped and butted against the cantilever beam section;

[0012] Built-in flange negative Poisson's ratio energy dissipation cover plates, the built-in flange negative Poisson's ratio energy dissipation cover plates are arranged on the inner sides of the upper and lower flanges at the joints between the steel beam and the cantilever beam section, connecting and fixing the steel beam and the cantilever beam section to suppress flange out-of-plane buckling and dissipate energy;

[0013] An external flange self-balancing disc spring assembly is arranged on the outer sides of the upper and lower flanges where the steel beam and the cantilever beam section meet, connecting and fixing the steel beam and the cantilever beam section to achieve self-resetting energy dissipation.

[0014] A built-in web self-balancing disc spring assembly is arranged on both sides of the web at the junction of the steel beam and the cantilever beam section, connecting and fixing the steel beam and the cantilever beam section to perform self-resetting energy dissipation.

[0015] Preferably, the built-in flange negative Poisson's ratio energy dissipation cover plate includes four groups of negative Poisson's ratio small cover plates, and the four groups of negative Poisson's ratio small cover plates are respectively connected to the inner sides of the upper and lower flanges at the junction of the steel beam and the cantilever beam section;

[0016] Preferably, the four groups of negative Poisson's ratio small cover plates are all made of peanut hole steel plates, and peanut holes arranged in a horizontal and vertical array are provided in the middle of the peanut hole steel plates;

[0017] Preferably, circular holes are provided at both ends of the peanut hole steel plate, the upper and lower flanges of the cantilever beam section are provided with circular holes corresponding to one end of the peanut hole steel plate, and the upper and lower flanges of the steel beam are provided with circular holes corresponding to the other end of the peanut hole steel plate, and both ends are connected and fixed by a group of high-strength bolts passing through the circular holes on the peanut hole steel plate and the circular holes on the steel beam and the cantilever beam section.

[0018] Preferably, the external flange self-balancing disc spring assembly includes four groups of flange self-balancing disc spring groups, and the four groups of flange self-balancing disc spring groups are respectively connected to the outer sides of the upper and lower flanges at the junction of the steel beam and the cantilever beam section.

[0019] Preferably, the flange self-balancing disc spring assembly includes:

[0020] Double angle steel, wherein the double angle steel is arranged with two legs facing each other in the longitudinal direction, and the other two legs are in contact with the upper and lower flanges of the steel beam and the cantilever beam section;

[0021] A plurality of disc spring groups, both ends of which are respectively connected to two oppositely arranged limbs of the double angle steel.

[0022] Preferably, the two relatively arranged limbs of the double angle steel are provided with a plurality of through holes for installing a plurality of the disc spring groups; the other two limbs of the double angle steel are provided with a plurality of circular holes, which are connected and fixed by a group of high-strength bolts passing through the circular holes on the peanut hole steel plate, the circular holes on the steel beam and the cantilever beam section, and the circular holes on the double angle steel.

[0023] Preferably, each of the plurality of disc spring groups includes a disc spring unit 1, two disc spring units 2 and a disc spring anchor, wherein the disc spring anchor is passed through the two relatively arranged limbs of the double angle steel, wherein one disc spring unit is set on the disc spring anchor between the two relatively arranged limbs of the double angle steel, and two disc spring units 2 are respectively set on the disc spring anchor outside the two relatively arranged limbs of the double angle steel.

[0024] Preferably, the disc spring anchor is a high-strength steel rod.

[0025] Preferably, the built-in web self-balancing disc spring assembly includes two groups of web self-balancing disc spring groups, and the two groups of web self-balancing disc spring groups are respectively connected to both sides of the web at the junction of the steel beam and the cantilever beam section.

[0026] Preferably, the web self-balancing disc spring assembly includes:

[0027] A double angle steel, wherein two legs of the double angle steel are arranged opposite to each other in the longitudinal direction, and the other two legs are in contact with the webs of the steel beam and the cantilever beam section;

[0028] A plurality of disc spring groups, wherein two ends of the plurality of disc spring groups are respectively connected to two oppositely arranged limbs of the double angle steel;

[0029] The double angle steels are symmetrically arranged on both sides of the web of the steel beam and the cantilever beam section, and the other two limbs are fixed by two tension connections of a high-strength bolt group.

[0030] Preferably, the disc spring groups are provided in three groups, and the three groups of disc spring groups are arranged in an equilateral triangle on the two relatively arranged limbs of the double angle steel.

[0031] The beneficial effects of the present invention relative to the prior art are:

[0032] The self-resetting assembled beam-column node provided by the present invention has a negative Poisson's ratio structure that is resistant to buckling, and has strong compressive stability and energy dissipation capacity. The negative Poisson's ratio energy dissipation cover plate of the flange disperses stress concentration by means of the negative Poisson's ratio effect. Specifically, the topological structure of the negative Poisson's ratio peanut hole optimizes the in-plane shear stiffness of the cover plate, and utilizes the tensile and compressive deformation characteristics of the hole wall to avoid buckling instability caused by lateral expansion in traditional structures, thereby improving the stability of the node. The node can still remain stable under large deformation, avoiding the buckling problem that is prone to occur in traditional nodes, so that the node maintains the elastic working state of the main structure while ensuring high energy dissipation efficiency. This design ensures the reliability of the node in earthquakes and can work normally even under large deformation conditions. In addition, during an earthquake, the deformation of the negative Poisson's ratio cover plate can also dissipate part of the seismic energy. The reinforced cover plate provides additional energy dissipation capacity, which can coordinate and control structural deformation to prevent large concentrated deformation.

[0033] The self-resetting assembled beam-column node provided by the present invention has good self-resetting ability. The assembled node can automatically return to its original position after an earthquake through its unique disc spring self-resetting design. When the beam section is bent, the upper disc springs of the flange self-balancing disc spring group and the web self-balancing disc spring group are subjected to tension, and the lower disc springs are subjected to pressure. The elastic potential energy is stored through the nonlinear elastic deformation of the disc springs. After the earthquake, the elastic potential energy is released to enable the flange and web to achieve self-resetting functions, respectively, and pull the node back to its original position. This self-resetting ability greatly reduces the residual deformation of the structure after the earthquake, making the building easier to repair and even allowing it to continue to be used without repair.

[0034] Although the disc spring groups at the flange and web both play a restoring role, the external flange self-balancing disc spring assembly provides a greater restoring force at the flange, and the internal web self-balancing disc spring assembly provides a relatively small restoring force at the web. When the node rotates, the tensile and compressive deformation of the flange disc spring group and the shear deformation of the web disc spring group cooperate with each other (satisfying the geometric coordination conditions), jointly improving the energy consumption and self-restoring effect of the node.

[0035] The self-resetting assembled beam-column node provided by the present invention dissipates energy in multiple stages to protect the main structure. The assembled node is designed with a multi-stage energy dissipation mechanism, which can absorb earthquake energy in stages. During a small earthquake, the disc spring adjusts the bolt preload through elastic deformation, and uses the friction and slip of the cover plate to dissipate energy, consuming part of the energy (elastic stage); during a medium earthquake, the negative Poisson's ratio cover plate yields and further absorbs energy (yield stage), and the node forms a dual energy dissipation mechanism of friction and slip and plastic deformation of the cover plate; during a large earthquake, the negative Poisson's ratio cover plate expands laterally under pressure, enhancing the local stability of the flange and delaying buckling to prevent a decrease in bearing capacity, and dissipates energy through friction and slip of the connection node between the angle steel and the high-strength bolt to prevent structural collapse (strengthening stage). This design not only protects the main structure, but also ensures that the node can work efficiently under different earthquake intensities.

[0036] The self-resetting prefabricated beam-column joint provided by this invention offers manageable damage and ease of repair. The joint's energy-dissipating components are removable, allowing them to be quickly replaced if damaged by an earthquake, eliminating the need for extensive repairs to the entire joint or structure. This modular design significantly reduces repair costs and time, enabling rapid restoration of the building.

[0037] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0039] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, provided they do not affect the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0040] Figure 1 A three-dimensional diagram of the self-resetting assembled beam-column node of Example 2;

[0041] Figure 2 This is an exploded view of the self-resetting assembled beam-column node of Example 2;

[0042] Figure 3 This is a front view of the self-resetting assembled beam-column node of Example 2;

[0043] Figure 4 A top view of the self-resetting assembled beam-column node of Example 2;

[0044] Figure 5 A three-dimensional diagram of a self-resetting cover plate built into the flange of a self-resetting assembled beam-column node according to Example 2;

[0045] Figure 6 A three-dimensional diagram of the flange external disc spring connector of the self-resetting assembled beam-column node of Example 2;

[0046] Figure 7 A three-dimensional diagram of the disc spring bolt group of the self-resetting assembled beam-column node of Example 1;

[0047] Figure 8 This is a three-dimensional diagram of the web external disc spring connector of the self-resetting assembled beam-column node of Example 2.

[0048] Markings in the figure:

[0049] Steel column 1, steel beam 2, cantilever beam section 3, built-in flange negative Poisson's ratio energy dissipation cover plate 4, negative Poisson's ratio small cover plate 42, external flange self-balancing disc spring assembly 5, flange self-balancing disc spring group 51, double angle steel 511, disc spring group 512, disc spring unit one 5121, disc spring unit two 5122, disc spring anchor 5123, high-strength bolt group one 6, built-in web self-balancing disc spring assembly 7, web self-balancing disc spring group 71, double angle steel 711, disc spring group 712, high-strength bolt group two 8, reinforced short beam 9.

[0050] In the various drawings, the same or corresponding reference numerals denote the same or corresponding parts. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0052] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] It should be understood that the terms "comprises / comprising," "consisting of," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product, apparatus, process, or method that includes a list of elements includes not only those elements but also, if necessary, other elements not explicitly listed, or elements inherent to such product, apparatus, process, or method. In the absence of further limitations, elements defined by the phrases "comprises / comprising," "consisting of," do not preclude the presence of additional identical elements in the product, apparatus, process, or method that includes the elements.

[0054] It should also be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific direction, be constructed or operate in a specific direction, and should not be understood as limiting the present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] As mentioned in the background, traditional joints suffer from the following bottlenecks: irreversible post-seismic performance defects, insufficient shear resistance and energy dissipation capacity, single functionality, and a lack of multi-level energy dissipation capabilities. To address the numerous issues with traditional prefabricated beam-column joints in terms of seismic performance, ease of construction, and joint damage resistance, this paper proposes a self-resetting prefabricated beam-column joint equipped with an easily removable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate. This joint is based on a series of innovative design concepts, including achieving a self-resetting function, ensuring high ductility of the connecting components, reducing the risk of joint damage, and optimizing the assembly process.

[0057] The specific implementation and preferred scheme of the self-resetting assembled beam-column node proposed by the present invention, which is equipped with an easily detachable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate, are described in detail below.

[0058] Overall Figure 1-8 As shown, the present invention proposes a self-resetting assembled beam-column node equipped with an easily removable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate, which mainly includes: a steel column 1, a steel beam 2, a cantilever beam section 3 on steel column 1, both steel column 1 and cantilever beam section 3 being H-shaped / I-shaped, and steel beam 2 also being H-shaped / I-shaped; the cantilever beam section 3 is welded to the steel column 1, and the steel beam 2 is connected and fixed to the steel column 1 by means of the cantilever beam section 3, forming a beam-column frame structure system. To ensure the connection strength and rigidity at the node of steel column 1, two node domain stiffening ribs (four for a total of two on both sides of the web) are welded between the two flanges at the position on steel column 1 corresponding to the cantilever beam section 3, and the two stiffening ribs are aligned with the upper and lower flanges of the cantilever beam section 3.

[0059] The difference of the present invention is that the self-resetting assembled beam-column node is provided with a built-in flange negative Poisson's ratio energy dissipation cover plate 4, an external flange self-balancing disc spring assembly 5 and a built-in web self-balancing disc spring assembly 7. It is easy to understand that the built-in flange negative Poisson's ratio energy dissipation cover plate 4 is connected to the inner sides of the upper and lower flanges in the form of a cover plate, and has a negative Poisson's ratio characteristic. The external flange self-balancing disc spring assembly 5 is also used to connect the upper and lower flanges. The built-in web self-balancing disc spring assembly 7 is used to connect the web and has the self-resetting characteristics of the disc spring. Specifically, the internal flange negative Poisson's ratio energy dissipation cover plate 4 connects and fixes the steel beam 2 and the cantilever beam section 3 on the inner sides of the upper and lower flanges via high-strength bolts, which can prevent buckling and dissipate energy. The external flange self-balancing disc spring assembly 5 connects and fixes the steel beam 2 and the cantilever beam section 3 on the outer sides of the upper and lower flanges via the flange self-balancing disc spring assembly, which achieves energy dissipation and self-reset. The internal web self-balancing disc spring assembly 7 connects and fixes the steel beam 2 and the cantilever beam section 3 on both sides of the web via the web self-balancing disc spring assembly, which achieves energy dissipation and self-reset. By simultaneously arranging the internal web self-balancing disc spring assembly 7 on the web of the H-shaped steel beam, the disc spring generates nonlinear elastic deformation when subjected to tension (compression), converting seismic energy into elastic potential energy storage. After the earthquake, the stored energy is released through elastic rebound, driving the beam-column node to produce a self-reset effect. It should be noted that although the disc spring groups at the flange and web both play a reset role, in fact, the external flange self-balancing disc spring assembly provides a greater reset force at the flange, and the internal web self-balancing disc spring assembly provides a relatively small reset force at the web. When the node rotates, the tensile and compressive deformation of the flange disc spring group and the shear deformation of the web disc spring group cooperate with each other (satisfying the geometric coordination conditions), jointly improving the energy consumption and self-reset effect of the node.

[0060] like Figure 1-8 As shown, first, a self-resetting assembled beam-column node is provided, which is equipped with an easily detachable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate. In this self-resetting assembled beam-column node, the built-in flange negative Poisson's ratio energy dissipation cover plate 4 is connected to the inner sides of the upper and lower flanges of the steel beam 2 and the cantilever beam section 3, and the corresponding external flange self-balancing disc spring assembly 5 is connected to the outer sides of the upper and lower flanges of the steel beam 2 and the cantilever beam section 3.

[0061] With this design, the node is equipped with built-in flange negative Poisson's ratio energy dissipation cover plates 4 on the upper and lower flanges of the H-shaped steel beam. Through the negative Poisson's ratio effect of the material, it exhibits special deformation characteristics when subjected to stress - lateral expansion when stretched and lateral contraction when compressed. This can more effectively disperse external loads and reduce stress concentration, thereby effectively reducing bending deformation damage to the beam under external forces. At the same time, the negative Poisson's ratio characteristic makes the steel plate more ductile, improving the ductility and durability of the steel plate, and maintaining stable performance under seismic loading. At the same time, external flange self-balancing disc spring assemblies 5 are set on the upper and lower flanges of the H-shaped steel beam. The disc springs produce nonlinear elastic deformation when under pressure, converting seismic energy into elastic potential energy storage. After the earthquake, the stored energy is released through elastic rebound, driving the beam-column node to produce a self-resetting effect, significantly improving the seismic performance of the entire structure. The present invention is based on a series of innovative design concepts. It combines the built-in flange negative Poisson's ratio energy dissipation cover plate 4 with the external flange self-balancing disc spring assembly 5, and realizes overall coordinated work through a modular assembly structure, realizing self-resetting function, staged yielding, ensuring high ductility of connecting components, reducing the risk of node damage and optimizing the assembly process.

[0062] In a specific embodiment, if Figure 1 、 Figure 5 The built-in flange negative Poisson's ratio energy dissipation cover plate 4 includes four groups of small negative Poisson's ratio cover plates 42. The four groups of small negative Poisson's ratio cover plates 42 are respectively connected to the inner sides of the upper and lower flanges at the joints of the steel beam 2 and the cantilever beam section 3. The width of the large negative Poisson's ratio cover plate 41 is consistent with the flange width on each side of the web of the steel beam 2 and the cantilever beam section 3. The length is determined according to requirements to completely cover the upper and lower flanges.

[0063] In some embodiments, see Figure 5The four sets of small, negative Poisson's ratio cover plates 42 are constructed using peanut-hole steel plates. A weakened zone is formed by a series of peanut holes arranged in a horizontal and vertical array in the middle of the peanut-hole steel plates. The peanut holes are arranged in a horizontal and vertical array in the weakened zone, alternating horizontally and vertically, and arranged in multiple rows and columns. In the same row, one horizontal peanut hole alternates with a vertical peanut hole, and in the same column, one vertical peanut hole alternates with a horizontal peanut hole. By designing a peanut hole weakening method and a reasonable aperture ratio, a lightweight design is achieved to reduce deadweight. At the same time, the negative Poisson's ratio effect of the component is achieved, causing the component to exhibit lateral contraction characteristics when subjected to stress, thereby avoiding the buckling instability caused by lateral expansion in traditional structures, effectively increasing the critical buckling load, alleviating out-of-plane buckling, and achieving a buckling-free effect. At the same time, the negative Poisson's ratio characteristic gives the component greater ductility, improving its ductility and durability, and enabling it to maintain stable performance under multiple seismic loadings. Furthermore, this characteristic optimizes the energy dissipation mechanism, enhancing the structure's energy absorption and seismic resistance under extreme loads. This design gives the structure better deformation capacity, allowing it to absorb more energy through plastic deformation when facing strong earthquakes, thereby enhancing the structure's seismic resistance and durability.

[0064] The porosity of the peanut hole is determined according to the design requirements. If the porosity is too small, the negative Poisson's ratio effect is difficult to reflect. If the porosity is too large, the structural strength is difficult to ensure. Studies have shown that an opening rate of 40-50% is appropriate, that is, a solid rate of 50-60% is a reasonable range.

[0065] Of course, in addition to peanut holes, elliptical holes, star-shaped holes, etc. can also be used to make the inner core have negative Poisson's ratio characteristics.

[0066] In addition, circular holes are provided at both ends of the peanut-hole steel plate. The figure shows two rows of six circular holes at each end (a total of 12). The upper and lower flanges of cantilever beam section 3 each have six circular holes corresponding to one end of the peanut-hole steel plate, and the upper and lower flanges of the steel beam each have six circular holes corresponding to the other end of the peanut-hole steel plate. Both ends of the peanut-hole steel plate are connected and fixed by a group of high-strength bolts (6) passing through the circular holes in the peanut-hole steel plate and the circular holes in the steel beam 2 and cantilever beam section 3. The upper and lower flanges are connected and fixed here by the circular holes to prevent slippage.

[0067] See also Figures 1 to 3 as well as Figure 6 In some embodiments, the external flange self-balancing disc spring assembly 5 includes four groups of flange self-balancing disc spring groups 51, and the four groups of flange self-balancing disc spring groups 51 are respectively connected to the outer sides of the upper and lower flanges at the junction of the steel beam 2 and the cantilever beam section 3.

[0068] Specifically, the flange self-balancing disc spring group 51 includes: a double angle steel 511, and multiple disc spring groups 512. The double angle steel 511 includes two angle steels, which can be called a first angle steel and a second angle steel. The two angle steels are arranged with two limbs opposite to each other along the longitudinal direction of the steel beam. The figure better shows that the two limbs are arranged back to back, and the other two limbs are in contact with the outer sides of the upper and lower flanges of the steel beam 2 and the cantilever beam section 3; the two ends of the multiple disc spring groups 512 are respectively connected to the two oppositely arranged limbs of the double angle steel 511, connecting the two angle steels into a whole.

[0069] Preferably, the two relatively arranged limbs of the double angle steel 511 are provided with a plurality of through holes for installing a plurality of disc spring groups 512; the other two limbs of the double angle steel 511 are provided with a plurality of circular holes, and the upper and lower flanges of the steel beam 2 and the cantilever beam section 3 are provided with a plurality of circular holes (three holes are shown in the figure) for passing a high-strength bolt group 6.

[0070] Preferably, triangular steel plates are welded to the edges of each angle steel of the double angle steel 511, and multiple triangular steel plates are welded in the middle to divide the interior of the angle steel into multiple spaces. This strengthens the overall strength of the angle steel and prevents deformation during tension pre-tightening. At the same time, the interior is divided into multiple spaces to accommodate a corresponding disc spring group 512. In this embodiment of the present invention, two triangular steel plates are welded inside each angle steel to divide it into three spaces, and three corresponding disc spring groups 512 are provided. The three disc spring groups 512 are arranged in a triangular shape on the two opposite limbs of the double angle steel 511, such as an isosceles triangle or an equilateral triangle.

[0071] like Figure 7 As shown, specifically, each disc spring group 512 includes a disc spring unit 1 5121, two disc spring units 2 5122 and a disc spring anchor 5123. The disc spring anchor 5123 is passed through the two relatively arranged limbs of the double angle steel 511. The two relatively arranged limbs of the double angle steel 511 are correspondingly provided with through holes. The disc spring anchor 5123 adopts a high-strength steel rod and is passed through the through holes of the two limbs. A disc spring unit 1 5121 is sleeved on the rod between the two limbs, one disc spring unit 2 5122 is sleeved on the rod in one of the angle steels, and the other disc spring unit 2 5122 is sleeved on the rod in the other angle steel, and the two ends of the rod are anchored and fixed.

[0072] During installation, the three disc spring groups 512 should first be pre-compressed and anchored to form the flange self-balancing disc spring group 51, and then the two flange self-balancing disc spring groups 51 are installed on the web through the high-strength bolt group 7.

[0073] The number and size of disc spring group 512 are determined according to design requirements. Disc spring unit 1 5121 and disc spring unit 2 5122 can be designed identically or differently. As shown in the figure, disc spring unit 1 5121 is designed to be longer than disc spring unit 2 5122. Furthermore, disc spring group 512 should maintain central symmetry or axial symmetry to prevent the generation of additional bending moments.

[0074] In the present invention, the flange self-balancing disc spring group 51 used first provides self-resetting capability. As is known to all, the reset force that a single disc spring can provide is very limited, and a larger reset force must be provided by overlapping disc springs. However, the overlapping of a large number of disc springs will cause an unpredictable increase in the friction between the disc spring surfaces, which in turn makes the support performance difficult to predict. The present invention adopts three groups of disc spring groups 512, and the friction force of a single group of disc spring groups can be effectively controlled. At the same time, when the disc spring group 512 is pulled, the disc spring unit 2 5122 works, and the disc spring unit 1 5121 does not work, which can further reduce the generation of additional friction. Similarly, when the disc spring group 512 is compressed, the disc spring unit 1 5121 works, and the disc spring unit 2 5122 does not work, which can also achieve the above-mentioned effect.

[0075] The flange self-balancing disc spring assembly 51 employed in the present invention also imparts a certain degree of bending resistance to the node. Because disc spring unit 2 5122 is compressed when disc spring group 512 is tensile, and disc spring unit 1 5121 is compressed when disc spring group 512 is compressed, and given that the node connection is not completely fixed but rather has a certain degree of rotational capability, if the flange self-balancing disc spring assembly 51 is compressed during an earthquake, for example, "bent" by the earthquake force, the ends may rotate, generating a bending moment in the center. At this time, disc spring unit 1 5121 in the middle of the symmetrical disc spring group is compressed, generating a rebound force that effectively resists the additional bending moment.

[0076] In actual use, the disc spring group 512 and the double angle steel 511 are a single, integrated product. The three disc spring units are initially connected by passing a steel rod through the two angle steels. The assembly is then completed by applying a preload to the disc spring units. If replacement is required, the entire assembly can be replaced directly.

[0077] See also Figure 1 、 Figure 2 as well as Figure 8 In some embodiments, the built-in web self-balancing disc spring assembly 7 includes two groups of web self-balancing disc spring groups 71, and the two groups of web self-balancing disc spring groups 71 are respectively connected to both sides of the web at the junction of the steel beam 2 and the cantilever beam section 3.

[0078] Similarly, the web self-balancing disc spring group 71 includes: double angle steel 711, multiple disc spring groups 712, the double angle steel 711 is arranged with two limbs opposite to each other along the longitudinal direction of the steel beam, and the figure better shows that the two limbs are arranged back to back, and the other two limbs are in contact with the web of the steel beam 2 and the cantilever beam section 3; the two ends of the multiple disc spring groups 712 are respectively connected to the two oppositely arranged limbs of the double angle steel 711, connecting the two angle steels into a whole; the double angle steel 711 is symmetrically arranged on both sides of the web of the steel beam 2 and the cantilever beam section 3, that is, two groups of double angle steels 711 and their corresponding disc spring groups 512 are arranged on both sides of the web, and the two groups of double angle steels 711 are fixed to each other on both sides of the web by a high-strength bolt group 8 passing through the other two limbs.

[0079] Preferably, the two relatively arranged limbs of the double angle steel 711 are provided with a plurality of through holes for installing a plurality of disc spring groups 712; the other two limbs of the double angle steel 711 are provided with a plurality of circular holes, and the webs of the steel beam 2 and the cantilever beam section 3 are provided with a plurality of circular holes (3 are shown in the figure) for passing a high-strength bolt group 2 8.

[0080] The specific structure of the double angle steel 711 and the disc spring group 712 is the same as that of the flange self-balancing disc spring group 51. The disc spring group 712 is also provided in three groups, and the three disc spring groups 712 are arranged in an equilateral triangle on the two opposite limbs of the double angle steel 711.

[0081] The embodiment of the present invention provides a self-resetting assembled beam-column joint equipped with an easily removable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate, which exhibits a multi-stage synergistic mechanism under earthquake action:

[0082] During the minor earthquake stage, the disc spring adjusts the bolt preload through elastic deformation, dissipates energy through friction and slip, and maintains the node stiffness.

[0083] During the moderate earthquake stage, the negative Poisson's ratio cover plate expands laterally under pressure, enhancing the local stability of the flange and delaying buckling. At the same time, its own hysteretic deformation absorbs energy, and the double angle steel enters plastic bending to form a second energy dissipation line.

[0084] During a major earthquake, the disc spring compensates for the attenuation of the bolt preload through continuous rebound, preventing node failure. The negative Poisson's ratio cover plate further dissipates energy and disperses stress concentration through large deformation extension, preventing brittle failure of the flange.

[0085] In addition, in actual implementation, the steel beam 2 can be arranged throughout the entire length, that is, directly connected to the cantilever beam section 3 through the built-in flange negative Poisson's ratio energy dissipation cover plate 4, the external flange self-balancing disc spring assembly 5, and the built-in web self-balancing disc spring assembly 7. Figure 2 、 Figure 2 As shown, since the beam ends are subjected to relatively large forces, in this embodiment, a reinforcing short beam 9 is welded to the end of the steel beam 2. The reinforcing short beam 9 is connected to the built-in flange negative Poisson's ratio energy dissipation cover plate 4, the external flange self-balancing disc spring assembly 5, and the built-in web self-balancing disc spring assembly 7, and then connected to the cantilever beam section 3. The cross-section of the reinforcing short beam 9 is larger, that is, the upper and lower flanges and the web are thicker than the steel beam 2, so as to play a local reinforcement role and better control (transfer) plastic damage.

[0086] In summary, the present invention, through the ingenious design of internal (external) flange negative Poisson's ratio covers and flange self-balancing disc spring assemblies to strengthen the joint domain, enables the beam-column joint to undergo a sequential elastic-yielding-strengthening phase under varying earthquake intensities, achieving efficient energy dissipation and absorption. High-strength bolt connections ensure stable force transmission between components, improve on-site assembly efficiency, and facilitate subsequent maintenance and replacement. The negative Poisson's ratio covers, in particular, significantly enhance the joint's shear resistance and energy dissipation capacity through their unique shear deformation and impact resistance. Furthermore, their open-cell and lightweight nature significantly reduces material consumption.

[0087] The prefabricated self-resetting prefabricated beam-column node proposed in the present invention has self-resetting ability, multi-stage energy dissipation characteristics and convenient construction. It is suitable for high-rise buildings and large-span steel structures in high-intensity seismic fortification areas. It can significantly improve the overall seismic performance and damage resistance of the structure, and effectively solves the problems of traditional nodes' difficulty in recovery and insufficient energy dissipation capacity after earthquakes, showing good application potential and promotion value.

[0088] All welding processes in this invention can be completed in a prefabrication plant, which produces standardized "modules." Construction sites simply locate the modules according to the pre-set bolt holes and assemble them using high-strength bolts to complete structural installation. This highly modular construction concept reduces labor and eases construction difficulty, effectively shortening the construction period.

[0089] Although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present invention. Certain features described in the context of separate embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

Claims

1. A self-resetting assembled beam-column joint equipped with an easily detachable self-balancing disc spring assembly and a negative Poisson's ratio energy dissipation cover plate, characterized in that: The self-resetting assembled beam-column node mainly includes: Steel columns with cantilever beam sections, both of which are H-shaped / I-shaped; A steel beam, the steel beam being H-shaped or I-shaped and butted against the cantilever beam section; Built-in flange negative Poisson's ratio energy dissipation cover plates, the built-in flange negative Poisson's ratio energy dissipation cover plates are arranged on the inner sides of the upper and lower flanges at the joints between the steel beam and the cantilever beam section, connecting and fixing the steel beam and the cantilever beam section to suppress flange out-of-plane buckling and dissipate energy; An external flange self-balancing disc spring assembly is arranged on the outer sides of the upper and lower flanges at the joints between the steel beam and the cantilever beam section, connecting and fixing the steel beam and the cantilever beam section to achieve self-resetting energy dissipation; A built-in web self-balancing disc spring assembly is arranged on both sides of the web at the junction of the steel beam and the cantilever beam section, connecting and fixing the steel beam and the cantilever beam section to perform self-resetting energy dissipation.

2. The self-resetting assembled beam-column node according to claim 1, characterized in that: The built-in flange negative Poisson's ratio energy dissipation cover plate includes four groups of negative Poisson's ratio small cover plates, and the four groups of negative Poisson's ratio small cover plates are respectively connected to the inner sides of the upper and lower flanges at the joints between the steel beam and the cantilever beam section; Preferably, the four groups of negative Poisson's ratio small cover plates are all made of peanut hole steel plates, and peanut holes arranged in a horizontal and vertical array are provided in the middle of the peanut hole steel plates; Preferably, circular holes are provided at both ends of the peanut hole steel plate, the upper and lower flanges of the cantilever beam section are provided with circular holes corresponding to one end of the peanut hole steel plate, and the upper and lower flanges of the steel beam are provided with circular holes corresponding to the other end of the peanut hole steel plate, and both ends are connected and fixed by a group of high-strength bolts passing through the circular holes on the peanut hole steel plate and the circular holes on the steel beam and the cantilever beam section.

3. The self-resetting assembled beam-column node according to claim 1, characterized in that: The external flange self-balancing disc spring assembly includes four groups of flange self-balancing disc spring groups, and the four groups of flange self-balancing disc spring groups are respectively connected to the outer sides of the upper and lower flanges at the junction of the steel beam and the cantilever beam section.

4. The self-resetting assembled beam-column node according to claim 3, characterized in that: The flange self-balancing disc spring assembly includes: Double angle steel, wherein the double angle steel is arranged with two legs facing each other in the longitudinal direction, and the other two legs are in contact with the upper and lower flanges of the steel beam and the cantilever beam section; A plurality of disc spring groups, both ends of which are respectively connected to two oppositely arranged limbs of the double angle steel.

5. The self-resetting assembled beam-column node according to claim 4, characterized in that: The two relatively arranged limbs of the double angle steel are provided with a plurality of through holes for installing a plurality of the disc spring groups; the other two limbs of the double angle steel are provided with a plurality of circular holes, which are connected and fixed by a group of high-strength bolts passing through the circular holes on the peanut hole steel plate, the circular holes on the steel beam and the cantilever beam section, and the circular holes on the double angle steel.

6. The self-resetting assembled beam-column node according to claim 4, characterized in that: Each of the multiple disc spring groups includes a disc spring unit 1, two disc spring units 2 and a disc spring anchor, and the disc spring anchor is passed through the two relatively arranged limbs of the double angle steel, wherein one disc spring unit is set on the disc spring anchor between the two relatively arranged limbs of the double angle steel, and two disc spring units 2 are respectively set on the disc spring anchor outside the two relatively arranged limbs of the double angle steel.

7. The self-resetting assembled beam-column node according to claim 6, characterized in that: The disc spring anchor is a high-strength steel rod.

8. The highly self-resetting assembled beam-column node according to claim 1 is characterized in that: The built-in web self-balancing disc spring assembly includes two groups of web self-balancing disc spring groups, and the two groups of web self-balancing disc spring groups are respectively connected to both sides of the web at the junction of the steel beam and the cantilever beam section.

9. The self-resetting assembled beam-column node according to claim 8, characterized in that: The web self-balancing disc spring assembly comprises: A double angle steel, wherein two legs of the double angle steel are arranged opposite to each other in the longitudinal direction, and the other two legs are in contact with the webs of the steel beam and the cantilever beam section; A plurality of disc spring groups, wherein two ends of the plurality of disc spring groups are respectively connected to two oppositely arranged limbs of the double angle steel; The double angle steels are symmetrically arranged on both sides of the web of the steel beam and the cantilever beam section, and the other two limbs are fixed by two tension connections of a high-strength bolt group.

10. The self-resetting assembled beam-column node according to claim 4 or 9, characterized in that: The disc spring groups are provided in three groups, and the three disc spring groups are arranged in an equilateral triangle on the two relatively arranged limbs of the double angle steel.

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