Amplified metal composite viscoelastic damper

Abstract

The utility model relates to an enlarged type metal composite viscoelastic damper. The bottom of a metal damper is fixedly connected with an enlarged type viscoelastic damper. The metal damper comprises a T-shaped core plate, L-shaped restraining plates are fixedly connected to the two opposite sides of the T-shaped core plate in the vertical direction, friction areas are arranged between the tops, located on the vertical plane, of the L-shaped restraining plates and the T-shaped core plate, fixing areas are arranged between the bottoms of the L-shaped restraining plates and the T-shaped core plate, and energy dissipation webs are arranged on the portions, between the fixing areas and the friction areas, of the T-shaped core plate. The amplified viscoelastic damper comprises an upper connecting plate, an amplifying lever is hinged to the lower portion of the upper connecting plate, an inner steel plate is hinged to the lower portion of the amplifying lever, the inner steel plate is connected with an outer steel plate through a viscoelastic layer, and the outer steel plate is hinged to the amplifying lever through a fulcrum shaft. The defects of a metal damper can be overcome under small earthquakes, good energy consumption is achieved, the amplifying damper can be protected against excessive displacement and failure under large earthquakes, the damper consumes energy in a multi-stage mode, and the anti-seismic performance of the structure is improved. The components are connected through bolts, are highly assembled and are convenient to replace.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of amplification type metal composite viscoelastic damper. BACKGROUND

[0002] Adding damper in building structure can effectively reduce the influence of seismic load, wind load etc. on the safety of main structure, and improve the strong earthquake resistance of building. Metal damper can consume a large amount of seismic or wind vibration energy due to its good hysteresis energy dissipation characteristics and stable performance, thereby reducing the damage of building under various horizontal loads, and effectively reducing the life and property loss caused by earthquake or wind vibration, which is regarded as the first line of defense of building structure. Developing new materials and designing new energy dissipation mode have become the main direction of metal damper development.

[0003] However, most metal dampers have single energy dissipation mode, which cannot meet the needs of buildings under different earthquake levels, and most dampers are disposable, so that the energy dissipation capacity of the damper is reduced or even lost after the destruction of the energy dissipation component, and the damper cannot be recycled.

[0004] Metal damper can only play a good energy dissipation effect under large interlayer displacement and speed of structure. If the interlayer displacement and speed of structure are relatively small, the metal damper cannot provide sufficient damping force, and the damping effect is not ideal. In engineering practice, in order to increase the damping force of damper, the size of damper is often increased to achieve this, which not only increases the construction cost, but also affects the use function of building. Although the existing patent can solve the problem that damper cannot provide sufficient damping force under small interlayer displacement by adding displacement amplification device, the above amplification device will still amplify the relative displacement of damper when the interlayer displacement is large, so that it exceeds the allowable limit displacement, and the damper is destroyed and lost.

[0005] Therefore, in order to solve the above technical problems, the utility model provides an amplification type metal composite viscoelastic damper. UTILITY MODEL CONTENTS

[0006] In view of the shortcomings of prior art, the utility model solves the technical problem to provide an amplification type metal composite viscoelastic damper.

[0007] In order to solve the above technical problems, the technical scheme of the utility model is as follows: an amplification type metal composite viscoelastic damper, comprising a metal damper, and an amplification type viscoelastic damper fixedly connected to the bottom of the metal damper.

[0008] The metal damper comprises a T-shaped core plate, opposite vertical sides of the T-shaped core plate are fixedly connected with L-shaped constraint plates, the L-shaped constraint plates are provided with friction zones between the top portions in the vertical plane and fixed zones between the bottom portions, and energy dissipation webs are arranged on the T-shaped core plate between the fixed zones and the friction zones;

[0009] The amplification type viscoelastic damper comprises an upper connecting plate, the lower portion of the upper connecting plate is hingedly connected with an amplification lever, the lower portion of the amplification lever is hingedly connected with an inner steel plate, the inner steel plate is connected with an outer steel plate through a viscoelastic layer, and the outer steel plate is hingedly connected with the amplification lever through a fulcrum shaft.

[0010] Preferably, the friction zones are provided with brass friction plates on the opposite vertical sides of the T-shaped core plate, and the brass friction plates are in contact with the vertical planes of the L-shaped constraint plates on the same side.

[0011] Preferably, the brass friction plates are provided with a corresponding slot hole on the vertical plane of the T-shaped core plate, the vertical plane of the L-shaped constraint plate is provided with a mounting through hole at the position of the corresponding slot hole, a high-strength bolt for applying pre-tightening force is mounted in the slot hole and the mounting through hole, and a locking nut is screwed on the high-strength bolt to tightly fasten the vertical plane of the L-shaped constraint plate, the brass friction plate and the vertical plane of the T-shaped core plate.

[0012] Preferably, the fixed zones are provided with filling plates on the opposite vertical sides of the T-shaped core plate, and the filling plates are in contact with the vertical planes of the L-shaped constraint plates on the same side.

[0013] Preferably, the vertical planes of the L-shaped constraint plates, the filling plates and the vertical planes of the T-shaped core plates are provided with a plurality of corresponding mounting through holes, and are tightly fastened together through high-strength bolts and nuts in the mounting through holes.

[0014] Preferably, the horizontal planes of the L-shaped constraint plates are fixedly connected with the upper connecting plate through high-strength bolts and nuts screwed on the high-strength bolts.

[0015] Preferably, the lower portion of the upper connecting plate is hingedly connected with two groups of amplification levers, and the hinge shafts are high-strength bolts with screwed nuts; the lower portion of the amplification lever is hingedly connected with the inner steel plate through a pin shaft.

[0016] Preferably, the outer steel plate is in the shape of a "U"-like character, the inner steel plate is located between the two vertical planes of the outer steel plate, and the viscoelastic layer is distributed on the opposite sides of the inner steel plate and contacts the vertical planes of the outer steel plate, respectively.

[0017] Preferably, the distance between the hinge shaft between the upper connecting plate and the amplification lever and the fulcrum shaft is smaller than the distance between the fulcrum shaft and the pin shaft.

[0018] Preferably, the bottom portion of the outer steel plate is fixedly provided with a horizontal bottom plate.

[0019] Compared with the prior art, the damper has the following beneficial effects: the damper can overcome the shortcomings of the metal damper to realize good energy dissipation under small earthquakes, and can protect the enlarged damper from failure due to excessive displacement under large earthquakes, realize multi-stage energy dissipation of the damper, and improve the seismic performance of the structure. Meanwhile, all the components are connected through bolts, and are highly assembled, so that the damper is convenient to replace after the earthquake.

[0020] The utility model will be further explained in detail in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure of the embodiment of the utility model is shown Figure 1 .

[0022] Figure 2 The structure of the embodiment of the utility model is shown Figure 2 .

[0023] Figure 3 The internal structure of the embodiment of the utility model after removing the L-shaped constraint plate and the outer steel plate is shown.

[0024] Figure 4 The structure of the T-shaped core plate is shown.

[0025] Figure 5 The hysteresis curve of the damper when the slot length is equal is shown.

[0026] Figure 6 The hysteresis curve of the damper when the pre-tightening force is equal is shown.

[0027] In the figure: metal damper 1, enlarged viscoelastic damper 2, T-shaped core plate 3, L-shaped constraint plate 4, energy dissipation web plate 5, upper connecting plate 6, enlarged lever 7, inner steel plate 8, viscoelastic layer 9, outer steel plate 10, fulcrum shaft 11, brass friction plate 12, slot 13, high-strength bolt 14, filling plate 15, pin shaft 16, bottom plate 17, top plate 18. DETAILED DESCRIPTION

[0028] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0029] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0030] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components, and / or combinations thereof.

[0031] As shown in Figures 1-6 The embodiment provides an amplification type metal composite viscoelastic damper, which comprises a metal damper 1, and an amplification type viscoelastic damper 2 is fixedly connected to the bottom of the metal damper.

[0032] The metal damper comprises a T-shaped core plate 3, L-shaped constraint plates 4 are fixedly connected to opposite vertical sides of the T-shaped core plate, the L-shaped constraint plates are provided with a friction zone between the top portions in the vertical plane and a fixed zone between the bottom portions, and a energy dissipation web 5 is arranged on the vertical plane of the T-shaped core plate between the fixed zone and the friction zone; the T-shaped core plate is made of Q235b steel, and the energy dissipation web is composed of a plurality of hourglass-shaped strips; the strips dissipate energy in the process of bending and shearing plastic deformation.

[0033] The amplification type viscoelastic damper comprises an upper connecting plate 6, an amplification lever 7 is hingedly connected below the upper connecting plate, an inner steel plate 8 is hingedly connected below the amplification lever, the inner steel plate is connected with an outer steel plate 10 through a viscoelastic layer 9, and the outer steel plate is hingedly connected with the amplification lever through a fulcrum shaft 11.

[0034] In the embodiment of the utility model, the friction zone is provided with brass friction pieces 12 on the two opposite sides of the vertical plane of the T-shaped core plate, and the brass friction pieces are in contact with the vertical planes of the L-shaped constraint plates on the same side.

[0035] In the embodiment of the utility model, the vertical planes of the T-shaped core plate and the brass friction pieces are both provided with two groups of corresponding slot holes 13, the vertical planes of the L-shaped constraint plates are both provided with mounting through holes at the positions of the corresponding slot holes, high-strength bolts 14 for applying pre-tightening force are mounted in the slot holes and the mounting through holes, and lock nuts are screwed on the high-strength bolts, so that the vertical planes of the L-shaped constraint plates, the brass friction pieces and the vertical planes of the T-shaped core plates are fastened together.

[0036] The high-strength bolts are applied with pre-tightening force to generate normal pressure at the friction piece-core plate interface, realize friction energy dissipation, and control the time when the metal damper starts to work.

[0037] In the embodiment of the utility model, the fixed zone is provided with filling plates 15 on the two opposite sides of the vertical plane of the T-shaped core plate, and the filling plates are in contact with the vertical planes of the L-shaped constraint plates on the same side.

[0038] The filling plate is slightly thinner than the brass friction plate;

[0039] In the embodiment of the utility model, the vertical plane of the L-shaped constraint plate, the filling plate and the vertical plane of the T-shaped core plate are all provided with three groups of one-to-one corresponding mounting through holes, and are fastened together through high-strength bolts and nuts on the mounting through holes, the high-strength bolts here do not apply pre-tightening force, and ensure that the fixing area, the filling plate and the L-shaped constraint plate do not appear relative displacement.

[0040] In the embodiment of the utility model, the horizontal plane of the L-shaped constraint plate is fixedly connected with the upper connecting plate through high-strength bolts and nuts screwed on the high-strength bolts.

[0041] In the embodiment of the utility model, the lower part of the upper connecting plate is hingedly connected with two groups of amplification levers, and the hinge shafts are high-strength bolts with screwed nuts; the lower part of the amplification lever is hingedly connected with the inner steel plate through the pin shaft 16.

[0042] In the embodiment of the utility model, the outer steel plate is in the shape of a "U" letter, the inner steel plate is located between the two vertical planes of the outer steel plate, and the viscoelastic layer is distributed on the two opposite sides of the inner steel plate and contacts the vertical planes of the outer steel plate respectively.

[0043] The viscoelastic layer adopts high-damping viscoelastic material;

[0044] In the embodiment of the utility model, the distance between the hinge shaft between the upper connecting plate and the amplification lever and the fulcrum shaft is smaller than the distance between the fulcrum shaft and the pin shaft.

[0045] In the embodiment of the utility model, the bottom of the outer steel plate is fixedly provided with a horizontal bottom plate 17.

[0046] In the embodiment of the utility model, the top of the T-shaped core plate is fixedly provided with a horizontal top plate 18.

[0047] The upper part of the metal damper is connected with the structure through the top plate, and the lower part of the amplification type viscoelastic damper is connected with the structure through the bottom plate.

[0048] In the embodiment of the utility model, the working principle of the amplification type metal composite viscoelastic damper is:

[0049] After the main body structure of the damper is assembled, the high-strength bolts of the friction area are pre-tightened to generate a normal pressure at the interface between the friction plate and the core plate. When the damping force is less than the limit friction force between the T-shaped core plate and the brass friction plate, the damping force is transmitted to the upper connecting plate through the L-shaped constraint plate, the upper connecting plate is displaced and drives the amplification lever to rotate around the fulcrum shaft, so that the inner steel plate is displaced. Because the distance between the hinged shaft between the upper connecting plate and the amplification lever and the fulcrum shaft is smaller than the distance between the fulcrum shaft and the pin shaft, the displacement of the inner steel plate is greater than that of the upper connecting plate, so that displacement amplification is realized. The viscoelastic layer between the inner steel plate and the outer steel plate starts to shear deformation to provide energy dissipation when the inner steel plate moves, which has good hysteresis characteristics and large damping performance. A certain gap is left between the inner steel plate and the bottom plate to facilitate the movement of the inner steel plate. When the damping force of the damper exceeds the limit friction force, the viscoelastic layer continues to work, but due to the setting of the groove hole on the T-shaped core plate, the relative displacement between the friction area and the L-shaped constraint plate begins to appear, and the pre-tightened high-strength bolt begins to slide in the groove hole. The fixed area of the T-shaped core plate and the L-shaped constraint plate are connected by high-strength bolts without pre-tightening, and will not produce relative displacement, so the upper and lower ends of the energy dissipation web will produce relative displacement, that is, the energy dissipation web starts to deform and dissipate energy. The initial position of the pre-tightened high-strength bolt is in the center of the groove hole to cope with the back and forth displacement, and at the same time, the maximum deformation degree of the energy dissipation web is controlled by the length of the groove hole. When the pre-tightened high-strength bolt slides to the end of the groove hole, the energy dissipation web yields and exits the work, and the damper enters the secondary energy dissipation stage, and the viscoelastic layer continues to work until it yields.

[0050] In actual work, the length of the groove hole, the pre-tightening force of the pre-tightened high-strength bolt and the amplification multiple of the amplification lever should be determined according to the specific situation to control the characteristics of the damper energy dissipation and better achieve the damping effect.

[0051] After the model is established in ABAUQUS and preliminary numerical simulation is carried out, the hysteresis curve of the damper is obtained Figure 5 , in which H is the length of the groove hole and F is the pre-tightening force of the pre-tightened high-strength bolt. It can be observed from the figure that the damper has the characteristics of multi-stage energy dissipation in the theoretical design, and when the length of the groove hole is 25 mm, the pre-tightening force of the pre-tightened high-strength bolt mainly affects the primary energy dissipation of the damper and has little effect on the secondary energy dissipation. Further numerical simulation is carried out on the influence of different lengths of the groove hole on the damper under the condition that the pre-tightening force is 20 KN, and the result of Figure 6 is obtained. It can be observed that the length of the groove hole mainly affects the time when the damper enters the secondary energy dissipation stage, and the smaller the length of the groove hole, the faster the damper enters the secondary energy dissipation stage.

[0052] The damper combines the advantages of metal dampers and amplification viscoelastic dampers, designs two damper grading energy dissipation mechanisms, can play a good energy dissipation effect under different earthquake levels, and has high assembly degree and is easy to replace after the earthquake.

[0053] The above merely describes preferred embodiments of the present application, but does not represent other forms of the present application. Any person skilled in the art can make changes or modifications to the above disclosed technical contents to form equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application and according to the technical essence of the present application still falls within the protection scope of the present application.

Claims

1. A magnified metal composite viscoelastic damper, characterized by: The metal damper is fixedly connected with an amplification type viscoelastic damper at the bottom; The metal damper comprises a T-shaped core plate, and opposite vertical sides of the T-shaped core plate are fixedly connected with L-shaped constraint plates; the L-shaped constraint plates and the T-shaped core plate are provided with a friction zone between the top portions in the vertical plane and a fixed zone between the bottom portions; and an energy dissipation web is arranged on the T-shaped core plate between the fixed zone and the friction zone. The amplification type viscoelastic damper comprises an upper connecting plate, the lower portion of the upper connecting plate is hingedly connected with an amplification lever, the lower portion of the amplification lever is hingedly connected with an inner steel plate, the inner steel plate is connected with an outer steel plate through a viscoelastic layer, and the outer steel plate is hingedly connected with the amplification lever through a fulcrum shaft.

2. The magnifying metal composite viscoelastic damper according to claim 1, wherein: The friction zone is provided with a brass friction plate on each of the opposite vertical sides of the T-shaped core plate, and the brass friction plate is in contact with the vertical plane of the L-shaped constraint plate on the same side.

3. The magnifying metal composite viscoelastic damper according to claim 2, wherein: A corresponding slot hole is formed in the vertical plane of the T-shaped core plate and the vertical plane of the L-shaped constraint plate, and a high-strength bolt for applying pre-tightening force is arranged in the slot hole and the mounting through hole.

4. The magnifying metal composite viscoelastic damper according to claim 1, wherein: The fixed zone is provided with a filling plate on each of the opposite vertical sides of the T-shaped core plate, and the filling plate is in contact with the vertical plane of the L-shaped constraint plate on the same side.

5. The magnifying metal composite viscoelastic damper according to claim 4, wherein: A corresponding mounting through hole is arranged on the vertical plane of the L-shaped constraint plate, the filling plate and the vertical plane of the T-shaped core plate, and the mounting through holes are fastened together through high-strength bolts and nuts.

6. The magnifying metal composite viscoelastic damper according to claim 1, wherein: The horizontal plane of the L-shaped constraint plate is fixedly connected with the upper connecting plate through high-strength bolts and nuts screwed on the high-strength bolts.

7. The magnifying metal composite viscoelastic damper according to claim 1, wherein: The lower portion of the upper connecting plate is hingedly connected with two groups of amplification levers, and the hinge shafts are high-strength bolts with nuts.

8. The magnifying metal composite viscoelastic damper according to claim 1, wherein: The shape of the outer steel plate is similar to a "U" shape, the inner steel plate is located between the two vertical planes of the outer steel plate, and the viscoelastic layer is distributed on the opposite sides of the inner steel plate and contacts the vertical planes of the outer steel plate.

9. The magnifying metal composite viscoelastic damper according to claim 7, wherein: The distance between the hinge shafts between the upper connecting plate and the amplification levers and the fulcrum shafts is smaller than the distance between the fulcrum shafts and the pin shafts.

10. The magnifying metal composite viscoelastic damper according to claim 1, wherein: The bottom portion of the outer steel plate is fixedly provided with a horizontal bottom plate.

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