Novel self-resetting overload protection friction-viscous damper

Abstract

The utility model discloses a novel self-resetting overload protection friction-viscous damper, which is characterized in that an SMA sliding friction damper is connected in series in a traditional viscous damper to serve as a friction self-resetting device, overload protection is performed on the damper and an energy dissipation substructure, and the self-resetting overload protection friction-viscous damper can be used in small and medium earthquakes. The damping medium in the viscous damper interacts with the piston to realize viscous energy dissipation and shock absorption; when a large earthquake occurs, the clamping plates and the cover plates slide to release damping force, two multi-stage energy dissipation and shock absorption mechanisms of friction and viscosity are achieved, meanwhile, the situation that a damper cylinder body and an energy dissipation substructure are damaged due to the fact that the damping force is too large can be avoided, and finally the safety of a building structure is guaranteed under small earthquakes, medium earthquakes and large earthquakes. The multi-level earthquake energy-dissipation device is simple in structure, stable in performance and convenient to produce, can cope with multi-level earthquakes, has the characteristic of self-adjusting energy-dissipation capacity, and is wide in application prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel self-resetting overload protection friction-viscous damper belongs to building engineering energy dissipation and shock reduction technical field. BACKGROUND

[0002] Earthquake is a natural disaster formed by the rapid release of energy of the crust, which has extremely strong destructive. The elastic wave (body wave and surface wave) produced by the earthquake will exert dynamic load on the building structure, which will cause different degrees of damage when the structural resistance is insufficient, and even cause the overall collapse, endangering the safety of people's life and property. Energy dissipation and shock reduction technology can greatly reduce the earthquake effect by increasing the damping of the structural system and consuming a large amount of seismic energy, thereby avoiding the collapse of the building and maximizing the protection of people's life and property.

[0003] At present, viscous dampers, metal dampers and friction dampers are widely used in the field of energy dissipation and shock reduction. Among them, viscous dampers are favored for their high energy dissipation and shock reduction efficiency. However, the damping force of traditional viscous dampers will increase instantaneously when facing a large earthquake, which may even exceed the bearing capacity of the cylinder and the connected substructure, resulting in damage to the cylinder itself or failure of the energy dissipation substructure, loss of protection ability to the structure due to the failure of the damper, and finally causing serious damage or even collapse of the structure. SUMMARY

[0004] To overcome the above problems, the utility model provides a novel self-resetting overload protection friction-viscous damper.

[0005] The utility model adopts the following technical scheme:

[0006] A novel self-resetting overload protection friction-viscous damper, comprising:

[0007] A cylinder, a piston is arranged in the cylinder, the inside of the cylinder is divided into two damping chambers along the axial direction, the damping chambers are filled with damping medium, and a first spherical hinge seat is arranged at the right end of the cylinder;

[0008] A piston rod, one end of the piston rod extends into the cylinder from the left end of the cylinder, the other end of the piston rod extends out of the left end of the cylinder and is connected to the second spherical hinge seat through an SMA sliding friction damper composed of a clamping plate, a cover plate and an SMA bolt, a piston sleeve is arranged on the piston rod, and the piston rod drives the piston to reciprocate along the inner wall of the cylinder in the axial direction;

[0009] The SMA sliding friction damper is integrated on the piston rod extending out of the left end of the cylinder, and the overload protection of the damper is realized through the self-resetting structure.

[0010] The SMA sliding friction damper consists of a clamping plate, a cover plate, and SMA bolts. It divides the piston rod between the second spherical hinge seat and the left end of the cylinder into two sections. A clamping plate is connected to each of the two opposite sections. The cover plate covers the two clamping plates from top to bottom. The SMA bolts serve as prestressing elements and connect the clamping plates and the cover plate through the clamping plates.

[0011] The piston is fitted with a clearance to allow the damping medium to pass through and flow relative to the piston, thereby generating a damping force. The piston rod is also fitted with a clearance to ensure that the damping medium does not pass through and that the piston rod drives the piston to move.

[0012] The cylinder body is provided with a front seal at the left end and a rear seal assembly between the right end of the cylinder body and the first spherical hinge. The piston rod passes through the front seal and the rear seal assembly in sequence to form a horizontal sliding pair. The rear seal assembly includes a rear seal and a connecting chamber. The piston rod passes through the rear seal and then extends into the cavity of the connecting chamber to provide displacement space for the piston rod. The end of the connecting chamber is threadedly connected to the first spherical hinge.

[0013] The damping medium is selected from one of hydraulic oil, silicone oil, silicone adhesive, or special suspension.

[0014] The working principle of this invention is as follows: During minor and moderate earthquakes, the SMA sliding friction damper integrated on the piston rod is not activated. The piston rod drives the piston to move repeatedly. When the piston moves, it squeezes the damping medium to move to another chamber. The damping medium moves through the gap between the piston and the cylinder wall. At this time, the damping medium and the piston generate relative motion. During this stage, the viscous mechanism of the damping medium is used to consume seismic energy, thereby achieving the seismic resistance function.

[0015] During a major earthquake, the damping force continuously increases. When the damping force exceeds the friction force of the self-resetting friction damper (SMA sliding friction damper), the self-resetting friction damper is activated. At this point, the damping force remains constant, preventing the cylinder and energy dissipation substructure from bearing excessive force and causing damage. Simultaneously, it achieves energy dissipation through a dual mechanism of viscous-static friction. After the earthquake's force dissipates, the clamps and cover plates return to their original positions under the action of the SMA bolts, achieving a self-recovery function.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model connects an SMA sliding friction damper in series. As an overload protection device, it can greatly ensure the safety of the building and reduce the maintenance cost of the damper.

[0018] (2) This utility model has multi-stage energy consumption, viscous damping to reduce energy consumption when the earthquake action is small, and viscous-friction to reduce energy consumption when the earthquake action is large, which ensures that the building can be used in small earthquakes and that the building is safe under medium and high intensity earthquake action.

[0019] (3) This utility model perfectly matches the working performance of viscous dampers and friction dampers, has simple mechanical properties, and is not prone to stress concentration.

[0020] (4) This utility model combines two types of dampers, which can improve seismic performance by replacing the damping material with a higher one, increasing the contact area between the clamping plate and the cover plate, and increasing the maximum displacement between the clamping plate and the cover plate. It has a simple structure, is practical and efficient, and has a wide range of applications.

[0021] (5) The installation method of this utility model is no different from that of traditional viscous dampers, which is convenient for installation. Attached Figure Description

[0022] Figure 1 This is a three-dimensional view of the friction-viscosity damper of this utility model;

[0023] Figure 2 This is a two-dimensional plan view of the friction-viscosity damper of this utility model;

[0024] Figure 3 This is a two-dimensional planar view of an SMA sliding friction damper;

[0025] The following are the labels in the diagram: 1. Second spherical hinge seat, 2. Clamping plate, 3. Cover plate, 4. SMA bolt, 5. Piston rod, 6. Damping medium, 7. Piston, 8. Cylinder body, 9. First spherical hinge seat, 10. Front seal, 11. Rear seal, 12. Connecting chamber. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] A novel self-resetting overload protection friction-viscous damper, such as Figure 1 As shown, it includes:

[0028] The cylinder body 8 has a piston 7 inside, which divides the interior of the cylinder body 8 into two damping chambers along the axial direction. The damping chambers are filled with damping medium 6. The right end of the cylinder body 8 is provided with a first spherical hinge seat 9.

[0029] Piston rod 5, one end of piston rod 5 extends into cylinder 8 from the left end of cylinder 8, and the other end of piston rod 5 extends out of cylinder 8 and is connected to the second spherical hinge seat 1 through an SMA sliding friction damper composed of clamping plate 2, cover plate 3 and SMA bolt 4. Piston 7 is sleeved on piston rod 5, and piston rod 5 drives piston 7 to reciprocate axially along the inner wall of cylinder 8.

[0030] The SMA sliding friction damper is integrated on the piston rod 5, which extends out of the left end of the cylinder 8, and achieves overload protection for the damper through a self-resetting structure.

[0031] In this embodiment, an SMA sliding friction damper is connected in series in a traditional viscous damper as a friction self-resetting device to provide overload protection. When the damping force exceeds the limit, the friction self-resetting device starts to activate, realizing the overload protection function of the substructure. After the earthquake dissipates, the device achieves self-resetting under the action of the SMA bolts. This damper uses a viscous mechanism to dissipate energy under minor earthquakes, while it has both friction and viscous energy dissipation mechanisms under moderate and major earthquakes, realizing efficient energy dissipation through multiple stages and different mechanisms, providing full protection for the structure. The damper has a relatively simple structure, a clear energy dissipation principle, is reusable, and is convenient for later design and maintenance.

[0032] Specifically, such as Figure 2 As shown, a front seal 10 is provided at the left end of the cylinder body 8, and a rear seal assembly is provided between the right end of the cylinder body 8 and the first spherical hinge seat 9. The piston rod 5 passes through the front seal 10 and the rear seal assembly in sequence to form a horizontal sliding pair. The rear seal assembly includes a rear seal 11 and a connecting chamber 12. The piston rod 5 passes through the rear seal 11 and extends into the cavity of the connecting chamber 12 to provide displacement space for the piston rod 5. The end of the connecting chamber 12 is threadedly connected to the first spherical hinge seat 9 to form an integral structure.

[0033] The piston 7 and the inner wall of the cylinder 8 maintain a precise clearance fit to allow the damping medium 6 to pass through and flow relative to the piston 7, thereby generating a damping force. The piston rod 5 and the piston 7 also have a small gap to form a dynamic fit, but it is necessary to ensure that the damping medium 6 does not pass through and that the piston rod 5 drives the piston 7 to move.

[0034] Specifically, the damping medium 6 can be selected according to its own seismic resistance requirements. Commonly used materials include hydraulic oil, silicone oil, silicone adhesive, or special suspension.

[0035] Specifically, such as Figure 3 As shown, the SMA sliding friction damper consists of a clamping plate 2, a cover plate 3, and an SMA bolt 4. It divides the piston rod 5 between the second spherical hinge seat 1 and the left end of the cylinder 8 into two sections. A clamping plate 2 is connected to each of the two opposite sections. The cover plate 3 covers the two clamping plates 2 from top to bottom, with a gap between them to allow for sliding under force. The SMA bolt 4, acting as a prestressing element, connects the clamping plate 2 and the cover plate 3, forming an integral structure. The clamping plate 2, cover plate 3, and SMA bolt 4 are all made of high-strength steel. The clamping plate 2 is welded to the piston rod 5, making the piston rod 5 and the SMA sliding friction damper a single integrated structure. This allows the SMA bolt to achieve its self-resetting function due to its superelastic properties; utilizes the sliding energy dissipation mechanism of the high-strength steel friction pair; and maintains the continuity of force transmission in the original piston rod system.

[0036] When an earthquake occurs, the damping structure (piston rod 5, damping medium 6, piston 7) is the first to bear the force, playing a protective role. The reciprocating motion of the piston generates damping force to resist the earthquake. When the damping structure reaches its bearing limit, the damping force also reaches its maximum value. At this time, the SMA sliding friction damper is activated for overload protection, causing the clamping plate 2 to begin to move. The SMA bolt 4 in the SMA sliding friction damper accumulates energy and undergoes slight deformation. The SMA bolt 4 will attempt to return to its original shape, further tightening the clamping plate 2 and the cover plate 3, increasing their contact surface, and activating static friction protection, converting mechanical energy into heat energy, and realizing viscous-static friction loss reduction. If the earthquake continues to increase, the static friction will gradually increase until it becomes dynamic friction, causing the cover plate 2 and the clamping plate 3 to slide. As the structural displacement increases, kinetic energy is converted into heat energy, realizing viscous-dynamic friction loss reduction. When the force decreases, the SMA bolt 4 releases energy and resets the clamping plate 2 and the cover plate 3.

[0037] for Figure 1 Analysis shows that the maximum displacement during self-resetting can be increased by increasing the size of the SMA sliding friction damper, thereby better protecting the structure; in addition, the surface friction coefficient can be increased by changing the surface materials of the clamping plate 2 and the cover plate 3, thereby increasing the upper limit of static friction force; or the materials of the piston rod 5 and the damping medium 6 can be changed to increase the magnitude of the damping force, thereby more effectively protecting the building.

[0038] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A novel self-resetting overload protection friction-viscous damper, characterized in that, include: The cylinder (8) is provided with a piston (7) which divides the interior of the cylinder (8) into two damping chambers along the axial direction. The damping chambers are filled with a damping medium (6). The right end of the cylinder (8) is provided with a first spherical hinge seat (9). One end of the piston rod (5) extends into the cylinder (8) from the left end of the cylinder (8), and the other end of the piston rod (5) extends out of the left end of the cylinder (8) and is connected to the second spherical hinge seat (1) through the SMA sliding friction damper. The piston (7) is sleeved on the piston rod (5), and the piston rod (5) drives the piston (7) to reciprocate axially along the inner wall of the cylinder (8). The SMA sliding friction damper is integrated on the piston rod (5) that extends out of the left end of the cylinder (8) and achieves overload protection of the damper through a self-resetting structure.

2. The novel self-resetting overload protection friction-viscous damper according to claim 1, characterized in that, The SMA sliding friction damper consists of a clamping plate (2), a cover plate (3), and an SMA bolt (4). It divides the piston rod (5) between the second spherical hinge seat (1) and the left end of the cylinder (8) into two sections. A clamping plate (2) is connected to each of the two opposite sections. The cover plate (3) covers the two clamping plates (2) from top to bottom. The SMA bolt (4) serves as a prestressing element and connects the clamping plate (2) and the cover plate (3) through the clamping plate (2) and the cover plate (3).

3. A novel self-resetting overload protection friction-viscous damper according to claim 1, characterized in that, The piston (7) is in clearance fit with the inner wall of the cylinder (8) to allow the damping medium (6) to pass through and flow relative to the piston (7) to generate damping force; the piston rod (5) is also in clearance fit with the piston (7) to ensure that the damping medium (6) does not pass through and the piston rod (5) drives the piston (7) to move.

4. A novel self-resetting overload protection friction-viscous damper according to claim 1 or 3, characterized in that, The cylinder (8) has a front seal (10) at the left end and a rear seal assembly between the right end of the cylinder (8) and the first spherical hinge (9). The piston rod (5) passes through the front seal (10) and the rear seal assembly in sequence to form a horizontal sliding pair. The rear seal assembly includes a rear seal (11) and a connecting chamber (12). The piston rod (5) passes through the rear seal (11) and extends into the cavity of the connecting chamber (12) to provide displacement space for the piston rod (5). The end of the connecting chamber (12) is threadedly connected to the first spherical hinge (9).

5. A novel self-resetting overload protection friction-viscous damper according to claim 1, characterized in that, The damping medium (6) is selected from one of hydraulic oil, silicone oil, silicone adhesive or special suspension.

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