Multi-stage energy consumption self-resetting connection node and wind power tower drum

Abstract

The invention provides a multi-stage energy consumption self-resetting connection node and a wind power tower drum, belongs to the technical field of wind power tower drums, and aims to solve the technical problems of fatigue fracture and bolt looseness easily caused by traditional rigid connection under a complex dynamic load. Comprising a first connecting end, a second connecting end, a self-resetting assembly and an energy consumption device, flange plates are arranged at the inner side ends of the first connecting end and the second connecting end, and the first connecting end and the second connecting end are connected into a whole through the self-resetting assembly. The energy dissipation device is arranged at the joint of the outer sides of the first connecting end and the second connecting end and comprises an energy absorption plate, a friction clamping plate, an energy absorption plate bolt and a friction clamping plate bolt, the energy absorption plate covers a joint of the first connecting end and the second connecting end, and the energy absorption plate is connected with the first connecting end through the energy absorption plate bolt. The friction clamping plate presses the energy absorption plate and is connected with the second connecting end through a friction clamping plate bolt, and the energy absorption plate and the friction clamping plate at least comprise a relative fixing state and a relative sliding state. The method has the effects of enhancing the energy consumption and deformation capacity of the structure, absorbing load energy and reducing the failure risk of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine towers, and in particular to a self-resetting connection node with multi-stage energy consumption and a wind turbine tower. Background Art

[0002] As the core supporting structure of a wind turbine, the wind turbine tower lifts key components such as the nacelle and blades to high altitudes, enabling it to efficiently capture wind energy and convert it into electricity at optimal wind speeds. The tower must not only support the immense weight of the turbine itself but also withstand complex and changing natural environments, such as strong winds and earthquakes. Consequently, the tower places extremely high demands on its structural strength, stability, and durability.

[0003] Traditional wind turbine towers are often rigidly joined using high-strength bolts fastened to flanges, offering convenient construction and clear force transmission. However, during wind turbine operation, dynamic loads such as wind and earthquakes are sporadic, short-lived, and heavy. Rigid connections, due to their limited energy dissipation and deformation capacity, are prone to fatigue fracture in connected sections due to excessive loads. Bolts can also loosen due to repeated vibration, leading to gradual structural failure and posing significant safety risks. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention proposes a multi-stage energy-consuming self-resetting connection node and a wind turbine tower to solve the technical problem that traditional rigid connections are prone to fatigue fracture and bolt loosening under complex dynamic loads, leading to structural failure.

[0005] The technical solution adopted by the present invention is a multi-stage energy consumption self-resetting connection node and a wind power tower.

[0006] Among them, the self-resetting connection node with multi-stage energy consumption includes a first connection end, a second connection end, a self-resetting component and an energy consumption device; The inner ends of the first connecting end and the second connecting end are provided with mutually matching flanges, and the self-resetting assembly connects the first connecting end and the second connecting end into one body; The energy dissipation device is arranged at the outer connection of the first connecting end and the second connecting end, and includes an energy absorbing plate, a friction clamping plate, an energy absorbing plate bolt and a friction clamping plate bolt. The energy absorbing plate covers the joint between the first connecting end and the second connecting end. The energy absorbing plate is connected to the first connecting end through the energy absorbing plate bolt. The friction clamping plate presses the energy absorbing plate and is connected to the second connecting end through the friction clamping plate bolt. The energy absorbing plate and the friction clamping plate include at least two states: relative fixed and relative sliding. Energy is squeezed and absorbed during relative sliding.

[0007] Optionally, mutually engaged ridges and grooves are provided between the energy absorbing plate and the friction clamping plate, and can limit relative sliding between the friction clamping plate and the energy absorbing plate along a direction perpendicular to the length of the ridges.

[0008] Optionally, the energy absorbing plate as a whole is made of superelastic material, or the interlocking area between the energy absorbing plate and the friction clamping plate is made of superelastic material, or the non-interlocking area of ​​the energy absorbing plate is made of superelastic material.

[0009] Optionally, circular holes are provided on the second connecting end and the friction cleat, and slotted holes are provided on the energy absorbing plate. The friction cleat bolt passes through the circular holes and slotted holes to tighten the energy absorbing plate and the friction cleat into one.

[0010] Optionally, a circular hole is provided on the friction cleat, and slotted holes are provided on the second connecting end and the energy absorbing plate, and the friction cleat bolt passes through the circular hole and the slotted hole to tighten the energy absorbing plate and the friction cleat into one.

[0011] Optionally, the length direction of the ridges and grooves is perpendicular to the normal direction of the connecting surface of the first connecting end and the second connecting end.

[0012] Optionally, the projection line of the mating surface of the energy absorbing plate and the friction clamping plate conforms to a sine function curve multiplied by an adjustment coefficient: k sinx, where k is the coefficient and x is the extension length of the mating surface.

[0013] Optionally, the self-resetting assembly includes a self-resetting assembly bolt and a disc spring, and the disc spring is placed on both sides of the flange of the first connecting end and the second connecting end and is locked by the self-resetting assembly bolt.

[0014] Optionally, the friction clamping plate bolts and the self-resetting assembly bolts are superelastic bolts, and / or the energy absorbing plate bolts are high-strength bolts.

[0015] The wind turbine tower comprises a plurality of tower sections, and adjacent tower sections are connected by using the multi-stage energy-consuming self-resetting connection nodes as described above.

[0016] It can be seen from the above technical solution that the beneficial technical effects of the present invention are as follows: The self-resetting assembly securely connects the first and second connection ends with a flange, preventing bolt loosening. Within the energy dissipation device, an energy-absorbing plate covers the joint and, in conjunction with the friction plate, can assume both relatively fixed and sliding states. This multi-stage absorption of complex dynamic load energy enhances the structure's energy dissipation and deformation capacity. This not only reduces the risk of fatigue fracture but also significantly lowers the likelihood of structural failure, ensuring safe and stable operation in complex environments. The self-resetting assembly not only provides the self-resetting driving force but also provides shear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0018] Figure 1 It is a three-dimensional schematic diagram.

[0019] Figure 2 This is a schematic diagram of the separation of the first connection end and the second connection end.

[0020] Figure 3 Schematic diagram of the matching connection hole between the second connection end and the friction splint bolt.

[0021] Figure 4 It is a partial schematic diagram of the self-resetting component.

[0022] Figure 5 It is a three-dimensional schematic diagram of the self-resetting component.

[0023] Figure 6 Schematic diagram of energy consumption device.

[0024] Figure markings: first connecting end 1, second connecting end 2, energy dissipation device 3, energy absorbing plate 301, protrusion 3010, slot 3011, friction clamp 302, energy absorbing plate bolt 304, friction clamp bolt 303, sinusoidal function curve 305, self-resetting component 4, self-resetting component bolt 401, disc spring 402. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0027] Among them, the self-reset connection node with multi-stage energy consumption is shown in the attached Figure 1 ,A possible implementation is as follows: It includes a first connection end 1, a second connection end 2, an energy dissipation device 3 and a self-resetting component 4; The first connection end 1 and the second connection end 2 are provided with matching flanges at their inner ends. The flange of the first connection end 1 is marked as a first flange 101, and the flange of the second connection end 2 is marked as a second flange 201. The self-resetting assembly 4 connects the first connection end 1 and the second connection end 2 into one body through the flanges. The energy dissipation device 3 is arranged at the outer connection of the first connecting end 1 and the second connecting end 2, and includes an energy absorbing plate 301, a friction clamping plate 302, an energy absorbing plate bolt 304 and a friction clamping plate bolt 303. The energy absorbing plate 301 covers the joint between the first connecting end 1 and the second connecting end 2. The energy absorbing plate 301 is connected to the first connecting end 1 through the energy absorbing plate bolt 304. The friction clamping plate 302 presses the energy absorbing plate 301 and is connected to the second connecting end 2 through the friction clamping plate bolt 303. The energy absorbing plate 301 and the friction clamping plate 302 include at least two states: relative fixed and relative sliding. When relatively sliding, they squeeze and absorb energy, and when relatively fixed, the whole is rigid.

[0028] In the above embodiment, the energy absorbing plate 301 and the first connecting end 1 are fixedly connected (energy absorbing plate bolts 304), and the friction cleat 302 and the second connecting end 2 are also fixedly connected (friction cleat bolts 303 connection), while the energy absorbing plate 301 and the friction cleat 302 are squeezed against each other and have two states: relatively fixed and relatively sliding. Under normal loads, the energy-absorbing plate 301 and friction plate 302 are relatively fixed, and the entire connection node exhibits rigidity. However, when a large external horizontal load is applied, the connecting surfaces of the first and second connection ends 1 and 2 tend to squeeze or separate from each other. In actual operation, since the two are connected by the energy dissipation device 3 and the self-resetting assembly 4, the primary tendency is separation, that is, a relative separation between the first and second connection ends 1 and 2. Furthermore, since the energy-absorbing plate 301 is connected to the first connection end 1 and the friction plate 302 is connected to the second connection end 2, relative motion between the energy-absorbing plate 301 and the friction plate 302 is also possible. Once this relative motion occurs, friction compression and deformation occur between the friction plate 302 and the energy-absorbing plate 301, absorbing the load and preventing actual relative motion between the first and second connection ends 1 and 2. Once the large external load is removed, the energy-absorbing plate 301 and the friction plate 302 return to their initial shapes, and the node becomes rigid again.

[0029] In one possible implementation, see the attached Figure 5The energy absorbing plate 301 and the friction plate 302 are provided with interlocking ridges 3010 and grooves, which restrict relative sliding between the friction plate 302 and the energy absorbing plate 301 along a direction perpendicular to the length of the ridges 3010. The lengths of the ridges 3010 and grooves are perpendicular to the normal of the connecting surface between the first and second connecting ends 1 and 2, thereby hindering relative movement between the first and second connecting ends 1 and 2. In the above embodiment, when the external load is less than a certain limit, the ridges 3010 and grooves fit tightly together, preventing relative sliding and misalignment between them. The mutual force is insufficient to overcome static friction, thereby ensuring the initial stability of the entire structure and improving the joint stiffness. This increased joint stiffness means that the structure can better maintain its shape and position under normal load, reducing unnecessary deformation. When the external horizontal load is large, the force acting on the structure exceeds the initial restraining force between the ridges 3010 and grooves, prompting the first and second connecting ends 1 and 2 to initiate relative movement. At this point, the ridges 3010 and the grooves begin to squeeze each other. Since the contact surfaces between the two are inclined, the squeezing force causes the friction plate 302 to move away from the energy absorbing plate 301, thereby also causing the friction plate bolts (303) to tensilely deform, and the ridges 3010 themselves to be squeezed and deformed. This deformation process converts the energy of the external load into friction energy dissipation between the ridges 3010 and the grooves, energy dissipation from squeezing deformation between the ridges 3010 and the grooves, and energy dissipation from deformation of the friction plate bolts, thereby achieving the purpose of absorbing the load energy. When the external horizontal load continues to increase, the lower end of the slotted hole in the mating area of ​​the energy absorbing plate 301 is squeezed against the friction plate bolts, and the friction energy dissipation mechanism in the mating area stops working. At this time, the non-mating area above the energy absorbing plate 301 will begin to deform. The energy dissipation in this stage is provided by the deformation energy of the non-mating area above the energy absorbing plate.

[0030] In the above embodiment, the design automatically adjusts its operating state based on the magnitude of the external load. Under normal loads, it remains stable, without affecting the structure's normal functionality. However, under high loads, the deformation of the ridges 3010, the friction of the friction plates, and the deformation of the bolts 303 absorb energy, effectively protecting the structure under varying load conditions and improving its adaptability and robustness. This characteristic ensures that the structure maintains excellent performance and stability in a variety of operating environments and usage scenarios.

[0031] In some possible embodiments, the energy absorption plate 301 may be constructed entirely of a superelastic material, or the mating area between the energy absorption plate 301 and the friction plate 302 may be constructed of a superelastic material, or the non-mating area of ​​the energy absorption plate may be constructed of a superelastic material. When employing a ribbed deformation energy dissipation method, the superelastic material may be used only in the mating area; when employing a friction energy dissipation method, the superelastic material may be used only in the non-mating area; if a combination of the two is employed, the superelastic material may be used throughout the entire structure. In the above embodiments, the superelastic material exhibits unique mechanical properties. After significant deformation under external force, it can quickly return to its original shape once the force weakens or disappears. When subjected to high-load impacts, such as strong collisions or sudden vibrations, the superelastic material can absorb significant amounts of energy through its own large deformation, significantly reducing damage to the overall structure. Furthermore, due to its excellent recovery properties, the structure can quickly return to its original state after the impact, without affecting subsequent use. This significantly improves the reliability and durability of the structure and reduces maintenance costs. This connection node can be widely used in wind turbine towers in special areas, such as those with high wind fluctuations and common seismic activity.

[0032] In the above-mentioned embodiments, superelasticity refers to the property of a material that undergoes significant deformation when subjected to a large external force and then fully recovers its original shape after the force is removed. This property stems from the material's internal entropy elasticity or phase transition mechanism, which fundamentally differs from ordinary elasticity (where strain and stress are linear and the strain range is small). An example of such materials is shape memory alloys (SMAs), which achieve superelasticity through a thermoelastic martensitic transformation and its reversal. When the external force exceeds a critical value, the austenite phase transforms into martensite, resulting in significant deformation. After unloading, the martensite phase reverts to austenite, returning to its original shape. Common examples include nickel-titanium alloys, which can achieve deformation rates of 60%-80% during tension, with no residual deformation after unloading. The memory alloy systems discovered so far include: Au-Cd, Ag-Cd, Cu-Zn, Cu-Zn-Al, Cu-Zn-Sn, Cu-Zn-Si, Cu-Sn, Cu-Zn-Ga, In-Ti, Au-Cu-Zn, NiAl, Fe-Pt, Ti-Ni, Ti-Ni-Pd, Ti-Nb, U-Nb and Fe-Mn-Si, etc. Those skilled in the art can refer to relevant information and make a selection by comprehensively considering factors such as performance differences and cost.

[0033] In one possible implementation, see the attached Figure 5 Circular holes are set on the second connecting end 2 and the friction clamping plate 302, and a slotted hole 3011 is set on the energy absorbing plate 301. The friction clamping plate bolt 303 passes through the circular hole and the slotted hole 3011 to tighten the energy absorbing plate 301 and the friction clamping plate 302 into one.

[0034] In the above embodiment, when the tower is subjected to load, the force and energy consumption process of the entire node is: In the first stage, under normal use load, the static friction force in the interlocking area between the energy absorbing plate 301 and the friction clamping plate 302 is not overcome, and the node exhibits rigid characteristics.

[0035] In the second stage, after the static friction in the mating area between the energy absorbing plate 301 and the friction cleat 302 is overcome by a small earthquake, the plate 301 and the friction cleat 302 begin to slide and rub against each other due to the presence of the slots 3011. The ridges 3010 and grooves in the mating area between the energy absorbing plate 301 and the friction cleat 302 undergo compression deformation and relative displacement. The mating area between the energy absorbing plate 301 and the friction cleat 302 becomes misaligned, and the thickness between the energy absorbing plate 301 and the friction cleat 302 increases. The friction cleat bolts 303 begin to be pulled and provide a reaction force, increasing the load required for relative sliding between the energy absorbing plate 301 and the friction cleat 302. In addition to the energy absorption effect of the deformation of the ridges 3010, the friction of the friction cleat and the deformation of the bolts 303 also absorb energy, thereby fully dissipating energy and improving the structural load-bearing capacity.

[0036] In the third stage, under moderate or severe earthquakes, after the lower end of the slot 3011 of the energy absorbing plate 301 is squeezed by the friction clamp bolt, the friction energy dissipation mechanism stops working. At this time, the non-embedded area on the upper part of the energy absorbing plate 301 will begin to deform. The energy dissipation in this stage is provided by the deformation energy of the non-embedded area on the upper part of the energy absorbing plate.

[0037] As an alternative to the above embodiment, see the attached Figure 3 , a circular hole is provided on the friction clamping plate 302, and a slotted hole 3011 is provided on the second connecting end 2 and the energy absorbing plate 301. The friction clamping plate bolt 303 tightens the energy absorbing plate 301 and the friction clamping plate 302 into one through the circular hole and the slotted hole 3011. In the above embodiment, the slotted hole is provided at the second connecting end 2, which can provide more flexible adjustment space for the bolts during installation, making it easier to align and install the components, reducing the difficulty and time cost of installation. During use, when the tower is loaded, this structure can also ensure the rigidity of the node under normal load. During small earthquakes, energy dissipation is achieved through relative sliding, extrusion deformation of the convex grooves, and stretching of the friction clamping plate bolts 303. In addition, the slotted hole at the second connecting end 2 allows the structure to move more freely, can better adapt to forces in different directions, and improve the overall performance and stability of the node.

[0038] In one possible implementation, see the attached Figure 5The projection line of the mating surface of the energy absorption plate 301 and the friction clamping plate 302 conforms to a sinusoidal function curve 305 multiplied by an adjustment coefficient: k sinx, where k is the coefficient and x is the extended length of the mating surface. The coefficient k is used to adjust the amplitude of the protrusion. When k is a small value, such as 0.5, the mating area has low peaks and valleys, making relative slip more likely. When k is a large value, such as 1, the mating area is deeper, making relative displacement more difficult and increasing the load threshold for energy absorption. Setting different coefficients k at different nodes along the height direction of the tower can enable the tower to achieve a reasonable distribution of the energy absorption starting action gradient according to the force difference at each height. For example, increasing the coefficient k at the bottom and other places with heavy loads can enhance the energy absorption and anti-destruction capabilities, while reducing the coefficient k at the top and other places with light loads to adapt to deformation; enhancing the overall stability, increasing the coefficient k in the middle to improve the ability to resist lateral and torsional forces, and matching the rigidity and flexibility of the upper and lower parts; better adapting to complex loads such as wind, earthquakes, and temperature changes, reducing the probability of damage; reducing the maintenance workload and cost caused by structural problems; at the same time, facilitating the design of precise performance control, and using a modular approach in construction to improve efficiency and quality, to comprehensively ensure the safe, reliable, and economical operation of the tower.

[0039] In addition, the energy absorption plate 301 and the friction splint 302 are designed to fit together using a sinusoidal function curve. The periodically undulating contact surface causes the direction of the friction force to change dynamically along the curve profile. Under load, the normal pressure distribution on the contact surface fluctuates periodically, and the components of the friction force in the transverse and longitudinal directions adjust accordingly, forming a multi-directional energy dissipation mechanism. This design avoids the local stress concentration caused by the single friction direction of traditional linear fitting surfaces. At the same time, the continuous transition characteristics of the sinusoidal curve make the contact pressure gradient smooth, reducing the risk of stress mutations. Under the action of small earthquakes, the synergistic effect of the dynamic friction components significantly improves the energy absorption efficiency and extends the service life of the friction surface.

[0040] The geometric characteristics of the sine curve concentrate deformation at the peaks and troughs, forming a controllable elastic deformation zone. When the load exceeds the static friction threshold, the ridges of the energy-absorbing plate and the grooves of the friction splint preferentially undergo extrusion deformation at the peaks. The troughs, due to their larger radius of curvature and lower deformation resistance, guide the deformation toward the low-stress area. This graded deformation pattern avoids overall structural instability while significantly improving the deformation bearing capacity of the node through local elastic energy dissipation at the peaks. Compared to traditional straight-line interlocking surfaces, the sinusoidal curve design makes the deformation process more orderly and reduces the additional damage caused by disordered buckling.

[0041] The symmetry and periodic arrangement of the sinusoidal curves create a multi-level energy buffering system. During unloading, the elastic restoring force of the contact surface acts in reverse along a sinusoidal path, causing the energy-absorbing plate and friction clamp to rebound in coordination, reducing residual displacement. Simultaneously, the periodic undulating structure disperses the rebound energy across multiple wavelength units, avoiding excessive local rebound caused by concentrated energy. Compared to linear mating surfaces, this design achieves more precise rebound control through geometric nonlinearity, significantly improving the long-term stability and reset accuracy of the node under dynamic loads.

[0042] In one possible implementation, see the attached Figure 6 The self-resetting assembly 4 includes a self-resetting assembly bolt 401 and a disc spring 402. The disc spring 402 is placed on both sides of the flanges of the first and second connecting ends 1 and 2 and is locked by the self-resetting assembly bolt 401. Furthermore, the friction plate bolt 303 is a superelastic bolt, and the third bolt 401 can be either a superelastic bolt or a conventional high-strength bolt. The superelastic bolt can be made of the same material as the energy absorbing plate 301, and / or the energy absorbing plate bolt 304 is a high-strength bolt (with a performance grade of 8.8 or above), ensuring a stable connection.

[0043] In summary, in the above embodiment, the node's force and energy consumption process is divided into three stages: In the first stage, under normal use load, the structure is rigid and has no deformation: the elastic preload of the self-resetting assembly 4 at the inner flange of the first connection end 1 and the second connection end 2 and the mutual limiting force of the energy absorption plate 301 and the friction clamping plate 302 of the outer energy dissipation device 3 of the first connection end 1 and the second connection end 2 are not overcome, and the node presents a rigid characteristic.

[0044] In the second stage, under the action of a small earthquake, the self-resetting component 4 is stretched and elastically deformed, and the fitting area of ​​the energy absorbing plate 301 and the friction clamping plate 302 is elastically deformed and displaced, driving the friction clamping plate bolt 303 to stretch and elastically deform: after the static friction in the fitting area of ​​the energy absorbing plate 301 and the friction clamping plate 302 is overcome, due to the existence of the long slot hole 3011, the energy absorbing plate 301 and the friction clamping plate 302 slide relative to each other, and the ridges 3010 and the grooves in the fitting area of ​​the energy absorbing plate 301 and the friction clamping plate 302 are squeezed and displaced to absorb friction energy. The ridges 3010 themselves are also squeezed and deformed to absorb energy, and the friction clamping plate 302 moves away from the tower wall. The thickness of the energy absorbing plate 301 and the friction clamping plate 302 increases. At this time, the friction clamping plate bolt 303 with prestressed pressure will stretch and absorb energy, and the bolt preload force of the high-rigidity self-resetting component 4 is also overcome and absorbs energy, and the high-strength steel disc spring 402 begins to be compressed and absorb energy. The stiffness and energy dissipation capacity of the node at this stage are mainly provided by the friction mechanism of the friction energy dissipation section, the deformation mechanism of the convex strip 3010, the deformation of the superelastic screw and the high-strength steel disc spring; In the third stage, under the action of medium to large earthquakes, the energy absorbing plate 301 is elastically deformed as a whole, and the self-resetting component 4 is further stretched and elastically deformed: the node undergoes large deformation, and the energy absorbing plate 301 and the friction clamping plate 302 slide relative to each other to the extreme position, that is, the long slot hole 3011 of the friction energy dissipation section of the energy absorbing plate 301 is in extrusion contact with the friction clamping plate bolt 303, and the friction mechanism of the friction energy dissipation section of the energy absorbing plate 301 and the friction clamping plate 302 stops working, but the middle section of the super-elastic energy absorbing plate 301 can still continue to deform by utilizing its elastic capacity, and at the same time, the high-strength steel disc spring 402 also continues to deform under pressure. At this stage, the energy consumption and stiffness of the node are provided by the super-elastic metal energy absorbing plate 301 and the high-strength steel disc spring. Those skilled in the art will understand that high-strength steel disc spring 402 refers to a disc spring made of high-strength steel. High-strength steel is a material with a complex microstructure. The desired chemical composition and complex microstructure are achieved through strictly controlled heating and cooling processes, and various strengthening mechanisms are employed to achieve varying strength, ductility, toughness, and fatigue properties. Generally speaking, high-strength steel refers to steel with a yield strength between 390 and 690 MPa. High-strength steel disc springs can significantly reduce product weight and improve performance while maintaining the same mechanical properties. Friction plate bolts 303 and superelastic bolts can also be made of the same high-strength steel.

[0045] This embodiment provides a wind turbine tower. A possible implementation method is as follows: it includes multiple tower sections, and adjacent tower sections are connected by the self-resetting connection nodes with multi-stage energy dissipation as described above. According to actual conditions, multiple sets of energy dissipation devices 3 and self-resetting components 4 can be set in the circumferential direction of adjacent tower sections. In the height direction of the tower, different coefficients k are used to construct interlocking areas to adapt to the load differences at different height positions. The connection of the tower sections by this node not only realizes the self-resetting performance of the tower structure after the earthquake, reduces or eliminates the residual deformation of the structure after the earthquake, reduces the damage to the structure after the earthquake, but also significantly increases the ductility and safety redundancy of the node. The use of an integrated superelastic metal energy-absorbing plate realizes the multi-stage energy dissipation feature of the node, which can not only effectively increase the energy dissipation capacity of the structure, but also effectively reduce the high-order seismic response of the structure. The node is simple to process and easy to install. All components can be prefabricated in the factory and assembled on site, which effectively improves construction efficiency and contributes to green environmental protection.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A multi-stage energy consumption self-resetting connection node, characterized by: It comprises a first connection end (1), a second connection end (2), an energy dissipation device (3) and a self-resetting component (4); The inner ends of the first connecting end (1) and the second connecting end (2) are provided with mutually matching flanges, and the self-resetting component (4) connects the first connecting end (1) and the second connecting end (2) into one body; The energy dissipation device (3) is arranged at the outer connection between the first connection end (1) and the second connection end (2), and includes an energy absorption plate (301), a friction clamping plate (302), an energy absorption plate bolt (304) and a friction clamping plate bolt (303). The energy absorption plate (301) covers the joint between the first connection end (1) and the second connection end (2). The energy absorption plate (301) is connected to the first connection end (1) through the energy absorption plate bolt (304). The friction clamping plate (302) presses the energy absorption plate (301) and is connected to the second connection end (2) through the friction clamping plate bolt (303). The energy absorption plate (301) and the friction clamping plate (302) include at least two states: relatively fixed and relatively sliding. When relatively sliding, they squeeze and absorb energy.

2. The multi-stage energy consumption self-resetting connection node according to claim 1, characterized in that: Mutually engaged ridges (3010) and grooves are provided between the energy absorbing plate (301) and the friction clamping plate (302), and are capable of limiting relative sliding between the friction clamping plate (302) and the energy absorbing plate (301) along a direction perpendicular to the length of the ridges (3010).

3. The multi-stage energy consumption self-resetting connection node according to claim 2, characterized in that: The energy absorbing plate (301) is entirely made of superelastic material, or the interlocking area between the energy absorbing plate (301) and the friction clamping plate (302) is made of superelastic material, or the non-interlocking area of ​​the energy absorbing plate is made of superelastic material.

4. The multi-stage energy consumption self-resetting connection node according to claim 1, characterized in that: The second connecting end (2) and the friction clamping plate (302) are provided with circular holes, the energy absorbing plate (301) is provided with a slotted hole (3011), and the friction clamping plate bolt (303) passes through the circular hole and the slotted hole (3011) to tighten the energy absorbing plate (301) and the friction clamping plate (302) into one.

5. The multi-stage energy consumption self-resetting connection node according to claim 1, characterized in that: The friction clamping plate (302) is provided with a circular hole, the second connecting end (2) and the energy absorbing plate (301) are provided with a slotted hole (3011), and the friction clamping plate bolt (303) passes through the circular hole and the slotted hole (3011) to tighten the energy absorbing plate (301) and the friction clamping plate (302) into one.

6. The multi-stage energy consumption self-resetting connection node according to claim 2, characterized in that: The length directions of the convex strips (3010) and the grooves are perpendicular to the normal direction of the connection surfaces of the first connection end (1) and the second connection end (2).

7. The multi-stage energy consumption self-resetting connection node according to claim 2, characterized in that: The projection line of the fitting surface of the energy absorbing plate (301) and the friction clamping plate (302) conforms to a sine function curve (305) multiplied by an adjustment coefficient: k sinx, where k is the coefficient and x is the extension length of the fitting surface.

8. The multi-stage energy consumption self-resetting connection node according to claim 1, characterized in that: The self-resetting assembly (4) comprises a self-resetting assembly bolt (401) and a disc spring (402), wherein the disc spring (402) is cushioned on both sides of the flange of the first connecting end (1) and the second connecting end (2) and is locked by the self-resetting assembly bolt (401).

9. The multi-stage energy consumption self-resetting connection node according to claim 7, characterized in that: The friction clamping plate bolts (303) and the self-resetting assembly bolts (401) are superelastic bolts, and / or the energy absorbing plate bolts (304) are high-strength bolts.

10. A wind turbine tower, characterized in that: It comprises a plurality of tower sections, and adjacent tower sections are connected by using the multi-stage energy-consuming self-resetting connection nodes as described in any one of claims 1 to 9.

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