Torsion type negative stiffness damper

Abstract

The invention discloses a torsion type negative stiffness damper, and belongs to the field of civil engineering. The device is composed of a torsion energy dissipation device, a negative stiffness device and a rotary connecting device, wherein the torsion energy dissipation device comprises a constraint plate, an energy dissipation steel pipe, a rotary shaft and a high-strength bolt; the negative stiffness device comprises a spiral spring, a guide rail, a fixed plate, a sliding plate and a sliding connecting rod; the rotating connecting device comprises a rotating plate, a hinged plate, a baffle and a rotating shaft. The whole damper is made of steel materials, the three devices can be independently disassembled and assembled, and the construction modes of factory prefabrication and on-site installation can be achieved. The damper has the characteristic of negative stiffness, and can provide energy consumption and reduce the internal force response and acceleration response of the structure under the action of an earthquake. In addition, the deformation of the energy dissipation device is not equal to that of the negative stiffness device, it can be guaranteed that the spiral spring is always in an elastic state, and the purpose that only the energy dissipation steel pipe is replaced without damaging other components can be achieved after earthquake damage.

Description

Technical Field

[0001] This invention relates to the field of vibration dampers, and specifically to a torsional energy-dissipating damper with negative stiffness characteristics. Background Technology

[0002] The application of vibration dampers in bridge structures is becoming increasingly widespread, as their excellent deformation energy dissipation capacity can reduce damage to the main bridge structure under seismic motion. However, this design has several drawbacks: First, because positive stiffness dampers improve seismic performance by increasing the overall strength and stiffness of the structure, they increase the natural frequency of the structure, leading to increased internal force and acceleration responses. Second, coupling positive stiffness dampers with seismic isolation bearings in the bridge structure can result in the disadvantage of seismic isolation cancellation. Third, most dampers are costly to replace and maintain after an earthquake; for example, metal dampers need to be completely removed and replaced after earthquake damage, and viscous dampers often experience problems such as liquid leakage during use. Therefore, the concept of negative stiffness has been introduced into the field of structural vibration control. However, current designs for negative stiffness dampers typically suffer from complex structural forms, difficult on-site installation, and high post-earthquake replacement costs. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a torsional negative stiffness damper, which has good energy dissipation capacity and reduces structural internal force response and acceleration response.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A torsional negative stiffness damper includes an energy dissipation device, a rotating connection device, and a negative stiffness device. The energy dissipation device is connected to the corresponding negative stiffness device on both the left and right sides of its middle section through a rotating connection device. The two rotating connection devices and the two negative stiffness devices are symmetrically arranged with respect to the left and right sides of the energy dissipation device. The energy-consuming device includes a first rotating shaft, an upper constraint plate, an upper energy-consuming steel pipe, a lower energy-consuming steel pipe, and a lower constraint plate. Two sets of upper and lower energy-consuming steel pipes are installed between the upper and lower constraint plates, and the upper constraint plate is connected to the upper energy-consuming steel pipe, the upper energy-consuming steel pipe is connected to the lower energy-consuming steel pipe, and the lower energy-consuming steel pipe is connected to the lower constraint plate by bolts. The first rotating shaft passes through the upper constraint plate, the upper energy-consuming steel pipe, the lower energy-consuming steel pipe, and the lower constraint plate in sequence. The rotating connection device includes a rotating plate and a connecting piece. One end of the rotating plate is bolted between the upper energy-consuming steel pipe and the lower energy-consuming steel pipe, and the other end is rotatably connected to the connecting piece. The negative stiffness device consists of a helical spring, a guide rail, a connecting rod, a sliding plate, and a fixed plate. The sliding plate is fixed to the connecting member via the connecting rod, and the sliding plate is connected to the fixed plate via the helical spring. The guide rail is fitted over the threaded spring, with one end fixed to the fixed plate and the other end open, allowing the sliding plate to slide inside it.

[0005] This invention combines a negative stiffness device and a torsional energy dissipation device, ensuring the damper has good deformation energy dissipation capability while possessing negative stiffness characteristics. Two sets of negative stiffness devices are symmetrically arranged according to predetermined dimensions, and a fixing plate is fixed to the target structure using high-strength bolts. Subsequently, the ends of the connecting rods are welded to the corresponding positions on the baffle, so that the negative stiffness devices, rotating connection devices, and energy dissipation devices are horizontally distributed in the initial state. Furthermore, the rotation direction of the rotating plate is consistent with the translational direction of the energy dissipation device. In the energy dissipation device, energy-dissipating steel pipes are arranged above and below the rotating plate along the rotation axis, with the central axis of the energy-dissipating steel pipes coinciding with the rotation axis of the rotating plate. Upper and lower constraint plates are arranged at the ends of the upper and lower energy-dissipating steel pipes, and high-strength bolts are used to fasten the constraint plates to the end plates of the energy-dissipating steel pipes. A suitable distance and corresponding bolt holes are reserved between the two energy-dissipating steel pipes along the central axis. One end of the rotating plate has only a pre-set rotation hole, connecting to the hinge plate via a rotation shaft; the other end has pre-set rotation holes and corresponding bolt holes, inserting itself between the upper and lower energy-dissipating steel pipes. Secure the end plates of the upper and lower energy-dissipating steel pipes to the rotating plate using high-strength bolts. Connect the energy-dissipating device and the rotating plate into a single unit using the first rotating shaft. The component sequence from top to bottom is: constraint plate - energy-dissipating steel pipe - rotating plate - energy-dissipating steel pipe - constraint plate. Secure the entire energy-dissipating device with nuts. Apply lubricating oil to the first rotating shaft to allow the components to rotate circumferentially. The diameter of the sliding plate is equal to the inner diameter of the guide rail, ensuring that the helical spring moves only along the horizontal axis during operation. Before installing the negative stiffness device, preload the helical spring.

[0006] As a further technical solution, the central axis of the upper and lower energy-consuming steel pipes coincides with the rotation axis of the rotating plate.

[0007] As a further technical solution, a force-bearing plate is set in the vertical direction of the energy-consuming device. The edge of the force-bearing plate is welded to the edges of the upper constraint plate and the lower constraint plate. By applying an external load perpendicular to the center to the force-bearing plate, the energy-consuming device moves along the direction of the external load.

[0008] As a further technical solution, the diameters at both ends of the first rotating shaft are larger than the diameter of its middle part, so that its two ends are positioned relative to the upper constraint plate and the lower constraint plate.

[0009] As a further technical solution, flanges are provided at both ends of the upper and lower energy-consuming steel pipes, and bolt holes and rotation holes are provided on the flanges.

[0010] As a further technical solution, a rotating hole is provided at each end of the constraint plate, and bolt holes are provided around both rotating holes.

[0011] As a further technical solution, a rotating hole is provided at each of the left and right ends of the rotating plate, and a bolt hole is provided on the outer ring of one of the rotating holes.

[0012] As a further technical solution, the connecting component includes two hinge plates and a baffle. One end of the two hinge plates is fixed to the baffle, and a rotating plate is inserted between the two hinge plates. The three are connected by a second rotating shaft.

[0013] As a further technical solution, the baffle is connected to the sliding plate via the connecting rod.

[0014] As a further technical solution, lubricating oil is applied to the first rotating shaft.

[0015] As a further technical solution, the guide rail is cylindrical, with several sets of holes pre-drilled on its side, each set of holes arranged along its diameter. Before installing the negative stiffness device, the helical spring is pre-compressed. When the spring is compressed to a predetermined length, a special stop is inserted into the opening of the guide rail to restrict the movement of the sliding plate, ensuring that the spring remains in a pre-compressed state during the installation of the damper. After the entire damper is installed, the special stop is removed from the opening of the guide rail.

[0016] As a further technical solution, the energy-consuming device, the negative stiffness device, and the rotating connection device are all prefabricated components that can be prefabricated in the factory and then assembled on site.

[0017] Compared with traditional positive stiffness dampers and existing negative stiffness dampers, this invention has the following outstanding advantages; The negative stiffness damper proposed in this invention has a horizontal structural arrangement consisting of a left-side negative stiffness device, a left-side rotating connection device, an energy dissipation device, a right-side rotating connection device, and a right-side negative stiffness device. Initially, the rotating plate forms a 180° horizontal angle with both the negative stiffness device and the energy dissipation device, and the helical springs at both ends are pre-compressed. A load-bearing plate is positioned vertically to the energy dissipation device, with its edge welded to the edge of the constraint plate. By applying an external load perpendicular to the center to the load-bearing plate, the energy dissipation device moves along the direction of the external load. By connecting the negative stiffness device and the torsional energy dissipation device in parallel, the damper possesses good energy dissipation capacity and negative stiffness characteristics. Under seismic loading, this avoids the drawbacks of increased internal forces and acceleration response in the structure. The rotating plate connects the energy dissipation device and the negative stiffness device, ensuring that the translational displacement of the energy dissipation device is unequal to the axial displacement of the helical springs in the negative stiffness damper. This guarantees that while the damper has sufficient energy dissipation deformation, the helical springs remain in an elastically compressed state. By setting the inner diameter of the sliding plate and the guide rail to be the same, the helical spring moves only axially, avoiding the drawbacks of complex force transmission and easy instability caused by changes in the direction of spring force. The torsional energy dissipation device and the negative stiffness device are connected in parallel, making these two components have an out-of-plane relationship in the direction of force, avoiding potential force coupling and mutual influence between the two devices. This simplifies the force mechanism of the damper. After an earthquake, because the helical spring remains in an elastic state, it is possible to replace only the energy dissipation steel pipe after the earthquake, without damaging other components, thus solving the problem of high post-earthquake replacement costs for dampers.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a front view of a torsional negative stiffness damper. Figure 2 For torsional negative stiffness dampers x Diagram showing axis rotation of 45°; Figure 3 For torsional negative stiffness dampers x Diagram showing axis rotation of 90°; Figure 4 This is a schematic diagram of an energy-consuming device; Figure 5 This is a schematic diagram of an energy-consuming steel pipe. Figure 6 This is a schematic diagram of the constraint plate; Figure 7 This is a schematic diagram of the disassembled negative stiffness device. Figure 8 This is a schematic diagram of the disassembled rotating connection device; Figure 9 This is a schematic diagram of the rotating plate; Figure 10 This is a schematic diagram of the rotating shaft; Figure 11 Finite element model diagram of a torsional negative stiffness damper Figure 12 A schematic diagram of the hysteresis curve of a torsional negative stiffness damper; In the diagram, 1. Rotating plate, 2. Constraint plate, 3. Energy-consuming steel pipe, 4. Guide rail, 5. First rotating shaft, 6. Hinge plate, 7. Force-bearing plate, 8. Baffle, 9. High-strength bolt, 10. Helical spring, 11. Connecting rod, 12. Sliding plate, 13. Fixed plate, 14. Second rotating shaft, 1-1. Rotating hole of the rotating plate, 1-2. Bolt hole of the rotating plate, 2-1. Rotating hole of the constraint plate, 2-2. Bolt hole of the constraint plate, 3-1. Rotating hole of the energy-consuming steel pipe, 3-2. Bolt hole at the end of the energy-consuming steel pipe, 4-1. Opening of the guide rail. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves. They do not limit the structure and are merely for the purpose of facilitating the description of this invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] As described in the background section, existing technologies have shortcomings. To address these technical problems, this invention proposes a torsional negative stiffness damper. In terms of construction, this damper can be disassembled into multiple independent modules, enabling factory prefabrication and on-site assembly. Mechanically, direct application to the energy-dissipating device ensures good energy dissipation capacity. The rotating connection device allows for unequal deformation between the energy-dissipating device and the negative stiffness device, resulting in more stable output force from the negative stiffness device, which remains in an elastic state. A piston-like device formed by guide rails and sliding plates ensures the helical spring always moves axially. By applying preload to the spring and ensuring it remains compressed throughout the movement, a force is generated that is always parallel to the rotating plate, creating a pressure release effect, i.e., a negative stiffness force. Furthermore, all components of the damper are coated with anti-corrosion material to ensure its durability.

[0023] like Figures 1-3 As shown, this embodiment discloses a torsional negative stiffness damper, which can achieve both energy dissipation capacity and reduction of structural natural frequency under seismic action, and can also achieve modular prefabrication and easy replacement after earthquake; it includes an energy dissipation device, a rotating connection device and a negative stiffness device. The left and right sides of the middle of the energy dissipation device are each connected to the corresponding negative stiffness device through a rotating connection device, and the two rotating connection devices and the two negative stiffness devices are symmetrically arranged with respect to the left and right sides of the energy dissipation device. Specifically, it includes a rotating plate 1, a constraint plate 2, an energy-consuming steel pipe 3, a guide rail 4, a first rotating shaft 5, a hinge plate 6, a force-bearing plate 7, a baffle 8, a high-strength bolt 9, a helical spring 10, a connecting rod 11, a sliding plate 12, and a fixed plate 13; like Figure 4As shown, the energy-consuming device consists of four energy-consuming steel pipes 3, two constraint plates 2, two first rotating shafts 5, and several high-strength bolts 9. The installation sequence of the energy-consuming device from top to bottom is: upper constraint plate 2, upper energy-consuming steel pipe 3, rotating plate 1, lower energy-consuming steel pipe 3, and lower constraint plate 2. All components are fixedly connected with high-strength bolts 9. Two energy-consuming steel pipes 3 are placed symmetrically on the left and right sides of the constraint plate 2, and a certain distance is reserved between the upper and lower energy-consuming steel pipes 3 for connection with the rotating plate 1. The rotating shafts pass through each component, and the entire energy-consuming device is clamped with nuts on the outside of the constraint plates 2 at both ends. Specifically, the two ends of the upper constraint plate 2 are respectively connected to the upper ends of their corresponding upper energy-consuming steel pipes 3 by bolts. The lower ends of the two upper energy-consuming steel pipes 3 are respectively connected to the upper ends of the rotating plate 1 and the lower energy-consuming steel pipe 3 corresponding to the rotating plate 1 by bolts. The lower ends of the two lower energy-consuming steel pipes 3 are respectively connected to the two ends of the lower constraint plate 2 by bolts. The rotating plate 1 is connected between the lower ends of the upper energy-consuming steel pipes 3 and the upper ends of the lower energy-consuming steel pipes 3. The bolts pass through the upper energy-consuming steel pipes 3, the rotating plate 1 and the lower energy-consuming steel pipes 3 in sequence to connect the three. The two ends of the upper constraint plate 2 are also provided with holes that cooperate with the first rotating shaft 5. The first rotating shaft 5 passes through the upper constraint plate 2, the upper energy-consuming steel pipe 3, the rotating plate 1, the lower energy-consuming steel pipe 3 and the lower constraint plate 2 respectively. The diameter of the two ends of the first rotating shaft 5 is larger than the diameter of its middle part, so that its two ends are positioned relative to the upper constraint plate 2 and the lower constraint plate 2.

[0024] Furthermore, the structure of the constraint plate 2 is as follows: Figure 6 As shown, a rotating hole 2-1 is provided at each of its left and right ends, and bolt holes 2-2 are provided around the two rotating holes 2-1. The rotating holes 2-1 are engaged with the first rotating shaft 5, and the bolt holes 2-2 are connected to the upper energy-consuming steel pipe 3 or the lower energy-consuming steel pipe 3.

[0025] Furthermore, the structure of the energy-consuming steel pipe 3 is as follows: Figure 5 As shown, flanges are provided at both ends of the energy-consuming steel pipe 3. The diameter of the flanges is larger than the diameter of the body of the energy-consuming steel pipe 3. Bolt holes 3-2 and rotating holes 3-1 are provided on the flanges. The rotating holes 3-1 are for the first rotating shaft 5 to pass through. The bolt holes 3-2 are engaged with bolts to realize the connection between the bolts and the constraint plate 2 or the rotating plate 1.

[0026] Furthermore, the rotating connection device consists of a rotating plate 1, a hinge plate 6, a baffle 8, and a second rotating shaft 14. The rotating device is symmetrically arranged on the left and right sides of the energy-consuming device. Taking one side as an example, its connection relationship is explained. One end of the rotating plate 1 is reserved with a rotating hole and a bolt hole, and the other end is reserved with only a rotating hole. One end of the rotating plate 1 is inserted into the reserved position between the upper and lower energy-consuming steel pipes 3. The rotating device and the energy-consuming device are connected as a whole by high-strength bolts 9 and the second rotating shaft 14. The other end of the rotating plate 1 is aligned with the opening between the two hinge plates 6. The second rotating shaft 14 is set to pass through and fasten the rotating plate 1 and the two hinge plates 6. The tails of the two hinge plates 6 are welded to the center position of the baffle 8.

[0027] Specifically, such as Figure 9 As shown, a rotating hole 1-1 is provided at each of the left and right ends of the rotating plate 1. Four bolt holes 1-2 are provided on the outer ring of the rotating hole 1-1 at the right end. The rotating hole 1-1 at the left end is connected to the hinge plate 6. The rotating hole 1-1 at the right end is used for the passage of the first rotating shaft 5. The bolt holes 1-2 are connected to the upper energy-consuming steel pipe 3 and the lower energy-consuming steel pipe 3. Furthermore, the negative stiffness device consists of a helical spring 10, a guide rail 4, a connecting rod 11, a sliding plate 12, and a fixed plate 13. The negative stiffness device is symmetrically arranged on both sides of the energy-consuming device. Specifically, the baffle 8 of the rotating connecting device on both sides is welded to the end of the sliding connecting rod 11, and the other end of the connecting rod 11 is welded to the sliding plate 12. A spring hole slot is provided at the center of the fixed plate 13 and the sliding plate 12, and the two ends of the helical spring 10 are fixed between the fixed plate 13 and the sliding plate 12 by spring bolts. The guide rail 4 is a hollow cylinder, with one end welded to the fixed plate 13. The inner diameter of the guide rail 4 is the same as the diameter of the sliding plate 12, allowing the sliding plate 12 to move only axially within the guide rail 4. The fixed plates 13 on both sides are fixed to the external structure.

[0028] Furthermore, high-strength bolts are used to connect the entire energy-consuming device into a whole, and lubricating oil is applied to the first rotating shaft 5 so that the component can rotate along the axis.

[0029] Furthermore, the guide rail 4 is cylindrical, with several sets of holes pre-drilled on its side, each set of holes arranged along its diameter. Before installing the negative stiffness device, the helical spring is pre-compressed. When the spring is compressed to a predetermined length, a special stop is inserted into the opening of the guide rail to restrict the movement of the sliding plate, ensuring that the spring remains in a pre-compressed state during the installation of the damper. After the entire damper is installed, the special stop is removed from the opening of the guide rail 4.

[0030] The overall structure of the negative stiffness damper of this invention, along the horizontal direction, is as follows: negative stiffness device on the left, rotating connection device on the left, energy dissipation device on the right, rotating connection device on the right, and negative stiffness device on the right. In the initial state, the rotating plate 1 forms a horizontal angle with both the negative stiffness device and the energy dissipation device, and the helical springs 10 at both ends are in a pre-compressed state. Furthermore, a force-bearing plate 7 is provided in the vertical direction of the energy dissipation device. The upper and lower edges of the force-bearing plate 7 are welded to the edges of the upper and lower constraint plates 2. By applying an external load perpendicular to the center to the force-bearing plate 7, the energy dissipation device moves along the direction of the external load.

[0031] Furthermore, energy-consuming devices, negative stiffness devices, and rotating connection devices can all be prefabricated in the factory and then assembled on-site.

[0032] Furthermore, this invention uses Abaqus software to establish a damper model of a certain size, and applies reciprocating loading to the damper to obtain, as shown... Figure 11 As shown in the hysteresis curve, the damper has good energy dissipation capacity and negative stiffness effect.

[0033] This invention combines a negative stiffness device and a torsional energy dissipation device, ensuring that the damper has good deformation energy dissipation capability while possessing the characteristics of negative stiffness.

[0034] This invention uses high-strength bolts to fix the fixing plate to the target structure. Then, the end of the connecting rod is welded to the corresponding position on the baffle, so that the negative stiffness device, rotating connection device, and energy dissipation device are initially arranged horizontally at 180°. Energy dissipation steel pipes are arranged along the left and right opposite sides of the rectangle, with the central axis of the steel pipes coinciding with the left and right opposite sides. Constraint plates are arranged along the top and bottom opposite sides of the rectangle. The end plates of the constraint plates and energy dissipation steel pipes are provided with corresponding bolt holes and rotating holes. High-strength bolts are used to fasten the constraint plates to the energy dissipation steel pipes. A distance equal to the thickness of the rotating plate is reserved between the two energy dissipation steel pipes along the central axis, and bolt holes are reserved at corresponding positions on the end plates of the energy dissipation steel pipes. One end of the rotating plate has only a pre-set rotating hole, connecting to the hinge plate via a rotating shaft; the other end has pre-set rotating holes and bolt holes, inserting it between the upper and lower energy dissipation steel pipes. High-strength bolts are used to fasten the end plates of the upper and lower energy dissipation steel pipes to the rotating plate. The energy-consuming device and the rotating plate are connected as a whole by a rotating shaft. The components from top to bottom are: constraint plate - energy-consuming steel pipe - rotating plate - energy-consuming steel pipe - constraint plate.

[0035] When the energy-dissipating device moves perpendicular to the load-bearing plate, the rotating plate causes one end of the energy-dissipating steel pipe to twist, while the constraint plate fixes the other end of the energy-dissipating steel pipe, thus generating a large torque in the energy-dissipating steel pipe. Under seismic action, energy is dissipated through the torsional deformation of the energy-dissipating steel pipe. The diameter of the sliding plate is equal to the inner diameter of the guide rail. During horizontal sliding, the side surface of the sliding plate remains in contact with the inner surface of the guide rail, ensuring that the helical spring moves only axially during operation.

[0036] Furthermore, before installing the negative stiffness device, the helical spring is pre-compressed. Several openings are pre-set along the circumference of the guide rail at corresponding positions, with every two openings aligned with the diameter of the cross-section. When the spring is compressed to a predetermined length, a special stop is inserted into the openings in the guide rail to restrict the movement of the sliding plate, ensuring that the spring remains pre-compressed throughout the damper's installation process. After the entire damper is installed, the stop is removed from the guide rail openings. Therefore, the helical spring will consistently generate an elastic force pointing towards the energy-dissipating device, thus achieving a negative stiffness effect.

[0037] In summary, this invention proposes a torsional negative stiffness damper, comprising a rotating plate, a constraint plate, an energy-dissipating steel pipe, a guide rail, a rotating shaft, a hinge plate, a force-bearing plate, a baffle, high-strength bolts, a helical spring, a connecting rod, a sliding plate, and a fixed plate. Firstly, it innovatively combines a negative stiffness device and a torsional energy-dissipating device, ensuring the damper possesses both good deformation energy dissipation capacity and negative stiffness characteristics. The energy-dissipating device, negative stiffness device, and rotating connection device can all be prefabricated in the factory and then assembled on-site. Two sets of negative stiffness devices are symmetrically arranged according to predetermined dimensions, and the fixed plate is fixed to the target structure with high-strength bolts. Subsequently, the ends of the connecting rods are welded to the corresponding positions on the baffle, so that the negative stiffness device, rotating connection device, and energy-dissipating device are horizontally distributed in the initial state. Furthermore, the rotation direction of the rotating plate is consistent with the movement direction of the energy-dissipating device. In the energy-dissipating device, the energy-dissipating steel pipe is arranged above and below the rotating plate along the rotation axis, with the central axis of the steel pipe coinciding with the rotation axis of the rotating plate. Constraint plates are placed at the ends of the upper and lower energy-consuming steel pipes, and high-strength bolts are used to fasten the constraint plates to the end plates of the energy-consuming steel pipes. A suitable distance and corresponding bolt holes are reserved between the two energy-consuming steel pipes along the central axis. One end of the rotating plate has only a pre-set rotating hole, which is connected to the hinge plate via a rotating shaft; the other end has a pre-set rotating hole and corresponding bolt holes, and is inserted between the upper and lower energy-consuming steel pipes. High-strength bolts are used to fasten the end plates of the upper and lower energy-consuming steel pipes to the rotating plate. The energy-consuming device and the rotating plate are connected as a whole by a rotating shaft. The component sequence from top to bottom is constraint plate - energy-consuming steel pipe - rotating plate - energy-consuming steel pipe - constraint plate. Nuts are used to tighten the entire energy-consuming system, and lubricating oil is applied to the rotating shaft to allow the components to rotate axially. The diameter of the sliding plate is equal to the inner diameter of the guide rail, ensuring that the helical spring moves only axially during operation. Before installing the negative stiffness device, the helical spring is pre-compressed. Several holes are pre-drilled along the circumference at corresponding positions on the guide rail, with every two holes aligned with the cross-sectional diameter. When the spring is compressed to the predetermined length, a special stop is inserted into the opening in the guide rail to restrict the movement of the sliding plate, ensuring that the spring remains in a pre-compressed state throughout the installation process. Once the entire damper is installed, the special stop is removed from the guide rail opening.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A torsional negative stiffness damper characterized by, The energy dissipation device, the rotating connection device and the negative stiffness device, the middle part of the energy dissipation device is connected with the corresponding negative stiffness device through a rotating connection device on the left and right sides respectively, and the two rotating connection devices and the two negative stiffness devices are symmetrically arranged relative to the left and right sides of the energy dissipation device; The energy dissipation device comprises a first rotating shaft, an upper constraint plate, upper energy dissipation steel pipes, lower energy dissipation steel pipes and a lower constraint plate, two groups of upper energy dissipation steel pipes and lower energy dissipation steel pipes are installed between the upper constraint plate and the lower constraint plate, and the upper constraint plate, the upper energy dissipation steel pipes, the lower energy dissipation steel pipes and the lower constraint plate are connected through bolts; The rotating connection device comprises a rotating plate and a connecting piece, one end of the rotating plate is installed between the upper energy dissipation steel pipes and the lower energy dissipation steel pipes through a bolt, and the other end is rotatably connected with the connecting piece; The negative stiffness device comprises a spiral spring, a guide rail, a connecting rod, a sliding plate and a fixed plate; the sliding plate is fixedly connected with the connecting piece through the connecting rod, and the sliding plate is connected with the fixed plate through the spiral spring; the guide rail is sleeved outside the spiral spring, one end of the guide rail is fixed with the fixed plate, and the other end is open, so that the sliding plate can slide in the guide rail.

2. The torsional negative stiffness damper of claim 1, wherein, The central axis of the upper energy dissipation steel pipes and the lower energy dissipation steel pipes coincides with the rotating axis of the rotating plate.

3. The torsional negative stiffness damper of claim 1, wherein, A stress plate is arranged in the vertical direction of the energy dissipation device, and the edges of the stress plate are welded with the edges of the upper constraint plate and the lower constraint plate.

4. The torsional negative stiffness damper of claim 1, wherein, The diameters of the two ends of the first rotating shaft are greater than the diameter of the middle part, so that the two ends are positioned relative to the upper constraint plate and the lower constraint plate.

5. The torsional negative stiffness damper of claim 1, wherein, The upper energy dissipation steel pipes and the lower energy dissipation steel pipes are provided with flanges at the two ends, and the flanges are provided with bolt holes and rotating holes.

6. The torsional negative stiffness damper of claim 1, wherein, The two ends of the constraint plate are respectively provided with a rotating hole, and the rotating holes are provided with bolt holes around the rotating holes.

7. The torsional negative stiffness damper of claim 1, wherein, The rotating plate is provided with a rotating hole at the left and right ends, and the outer circle of one of the rotating holes is provided with a bolt hole.

8. The torsional negative stiffness damper of claim 1, wherein, The connecting piece comprises two hinge plates and a baffle, one end of the two hinge plates is fixed with the baffle, the rotating plate is inserted between the two hinge plates, and the three are connected through a second rotating shaft, and the baffle is connected with the sliding plate through the connecting rod.

9. The torsional negative stiffness damper of claim 1, wherein, The first rotating shaft is coated with lubricating oil.

10. The torsional negative stiffness damper of claim 1, wherein, The guide rail is in a cylindrical shape, and a plurality of groups of holes are pre-formed on the side surface of the guide rail, and each group of holes is arranged along the diameter direction of the guide rail.

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