Displacement amplification type self-resetting shear damper

Abstract

The present invention discloses a displacement amplification type self-resetting shear damper, including a bearing member, an outer friction plate, an inner friction plate, a lever member, a partition, a prestressed bolt and a disc spring. The bearing members on both sides, the inner friction plate and the lever member constitute a lever system, and the friction slopes of the inner friction plate and the outer friction plate fit each other. When a bearing member undergoes a vertical relative displacement, the inner friction plate is pulled to produce a larger vertical displacement, and the outer friction plate is pushed outward along the friction slope, compressing the disc spring string combination to produce axial compression elastic deformation. After the external shear load of the bearing member is unloaded, the vertical relative displacement between the inner friction plate and the outer friction plate gradually recovers, and the axial compression elasticity of the disc spring string combination automatically recovers, realizing the self-resetting function of the damper. A friction plate or viscoelastic material is used between the inner friction plate and the support plate to realize displacement-related or displacement and speed-related energy dissipation. The hysteresis curve of the damper of the present invention presents a typical flag-shaped shape, and has good self-resetting and energy dissipation capabilities.

Description

Technical Field

[0001] The invention belongs to the technical field of structural engineering, and in particular relates to a displacement amplification type self-resetting shear damper. Background Art

[0002] Traditional concrete structural systems adopt a seismic design concept based on bearing capacity and ensure ductility through structural measures, hoping that the structure will achieve an ideal failure mode under earthquake action and dissipate seismic energy by relying on the plastic deformation of the structure itself. Structures designed with this guiding ideology will produce serious plastic damage and residual deformation after an earthquake, and repairing or rebuilding the structure will cause huge economic losses. Therefore, in recent years, the research and development of earthquake engineering has shown a trend from seismic resistance and seismic isolation to restorable functions. The self-resetting structure is a typical restorable functional structural system. On the basis of the rocking structure, a self-resetting device is added to restore the structure or component to its initial position, thereby reducing the residual deformation and repair difficulty of the structure or component after an earthquake.

[0003] However, there are still some problems with the current self-resetting structure. For example, the constraints between the self-resetting structural components need to be relaxed to realize the swing self-resetting mechanism, so the nonlinear stiffness of the self-resetting structure is smaller than that of the traditional seismic structure; the nodes or joints between the self-resetting structural components are generally connected by prestressed tendons and energy-absorbing elements, the splicing structure is relatively complex, the construction quality control is difficult, and the economy and practicality of the self-resetting technology are greatly reduced; the failure of the prestressed tendons of the self-resetting structure will lead to serious consequences, etc. These problems have limited the development and application of the self-resetting technology to a certain extent. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a displacement amplification type self-resetting shear damper, which realizes the shear displacement amplification effect and variable friction energy dissipation capacity through the ingenious combination of disc spring string combination, bearing member, partition and lever member. The shear deformation of adjacent structural members can be fully and efficiently utilized. Even in a small shear deformation state, the shear damper can also exert excellent self-resetting and energy dissipation capabilities; in combination with friction plates or viscoelastic materials, displacement-related energy dissipation or displacement and speed-related energy dissipation is realized; it has large nonlinear stiffness and bearing capacity, making up for the inherent deficiency of the self-resetting structure that relaxes the component connection constraints due to the swing self-resetting mechanism.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] The invention discloses a displacement amplification type self-resetting shear damper, comprising a bearing member A, a bearing member B, an outer friction plate, an inner friction plate, a lever member, a partition plate, a prestressed bolt and a disc spring string.

[0007] The bearing member A comprises an end plate A and an inner support plate which are perpendicular to each other; a groove is provided between the support plate and the end plate A; the bearing member B comprises an end plate B and two inner force transmission plates which are perpendicular to each other; the outer friction plate and the inner friction plate both have friction slopes which fit each other;

[0008] The lever member is two sets of steel plates, and a first connecting hole, a second connecting hole and a third connecting hole are provided on the lever member, and the first bolt, the second bolt and the third bolt are connected correspondingly;

[0009] The end plate A is arranged vertically and parallel to the end plate B, the support plate is arranged in the middle position, partitions are arranged at the front and rear ends of the support plate, the outer sides of the partitions are inner friction plates and outer friction plates, the lever member is arranged between the outer friction plate and the inner friction plate, the first bolt passes through the groove to connect the lever member and the inner friction plate, the second bolt connects the lever member and the support plate, and the third bolt connects the outer friction plate, the lever member and the force transmission plate; the prestressed bolts connect the outer friction plate, the inner friction plate, the support plate and the partition, and disc spring string combinations are arranged at both ends of the prestressed bolts.

[0010] Ordinary bolts are used to connect the bearing member A and the lever member, the bearing member B and the lever member, and the inner friction plate and the lever member. The bearing member A, the bearing member B and the inner friction plate form a lever system along the lever member. After a vertical relative displacement occurs between the bearing member B and the bearing member A, the inner friction plate is pulled to produce a larger vertical displacement, resulting in a displacement amplification effect.

[0011] The friction slopes of the inner friction plate and the outer friction plate fit each other, and the inner friction plate and the outer friction plate have initial shear bearing capacity under the action of the disc spring string combination under initial preload; when the inner friction plate and the outer friction plate undergo vertical relative displacement, the outer friction plate is pushed outward along the friction slope, further compressing the disc spring string combination to produce axial compression elastic deformation, and after the external shear load of the bearing parts A and the bearing parts B is unloaded, the vertical relative displacement between the inner friction plate and the outer friction plate is gradually restored, and the axial compression elasticity of the disc spring string combination is automatically restored, thereby realizing the self-resetting function of the damper.

[0012] A partition is provided between the inner friction plate and the support plate, and the partition is made of a friction plate or a viscoelastic material. When a friction plate is used, the inner friction plate and the support plate generate relative friction slip with the friction plate under the drive of shear load, thereby realizing displacement-related energy consumption; when a viscoelastic material is used, the two side surfaces of the viscoelastic material are respectively adhered to the inner friction plate and the support plate, and the inner friction plate and the support plate generate vertical relative displacement under the drive of shear load, driving the viscoelastic material to undergo shear deformation, thereby realizing displacement and speed-related energy consumption.

[0013] The prestressed bolts pass through and compress the disc spring string combination, the outer friction plate, the lever member, the inner friction plate, the partition plate and the support plate in sequence, so that the entire damper has greater nonlinear stiffness and bearing capacity, making up for the inherent deficiency of the self-resetting structure that the connection constraints of the components are relaxed due to the swing self-resetting mechanism, resulting in low structural stiffness.

[0014] Parameters such as the elastic stiffness and initial preload of the disc spring string combination, the slope and friction coefficient of the friction slope, and the lever arm length of the lever member can be reasonably designed to achieve the purpose of adjusting the hysteresis curve performance parameters of the damper, so as to realize the shear damper's more ideal self-resetting ability, energy dissipation capacity, and variable nonlinear stiffness capacity.

[0015] The beneficial effects of the present invention are:

[0016] 1. The traditional self-resetting technology uses prestressed tendons to provide the self-resetting ability of the structure, which has low safety redundancy. Failure of the prestressed tendons will lead to the collapse of the seismic structure. The present invention avoids this problem.

[0017] 2. It can fully and efficiently utilize the shear deformation of adjacent structural members. Even in a small shear deformation state, the shear damper can also exert excellent self-reset and energy dissipation capabilities;

[0018] 3. It has large nonlinear stiffness, which makes up for the inherent deficiency of low structural stiffness caused by the self-resetting structure relaxing the connection constraints of components due to the swing self-resetting mechanism, and effectively controls the nonlinear deformation of the seismic structure;

[0019] 4. Combined with the friction plate, it has displacement-related variable friction energy dissipation capacity. The greater the deformation, the stronger the bearing capacity and energy dissipation capacity, which is very beneficial for earthquake-resistant structures to resist large and super earthquakes;

[0020] 5. Combined with viscoelastic materials, it has displacement and velocity-related energy dissipation capabilities, and can effectively control the different seismic response requirements of various structural components, non-structural components and equipment;

[0021] 6. The device has a simple principle and is easy to realize standardized production and application. It has excellent energy dissipation and self-reset capabilities without the need for additional energy dissipation and self-reset devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional view of the displacement amplification type self-resetting shear damper of the present invention.

[0023] Figure 2 It is a top view of the displacement amplification type self-resetting shear damper of the present invention.

[0024] Figure 3 It is a disassembly diagram of the displacement amplification type self-resetting shear damper of the present invention.

[0025] Figure 4 (a) is a three-dimensional view of the bearing member A.

[0026] Figure 4 (b) is a top view of the carrier A.

[0027] Figure 5 (a) is a three-dimensional view of bearing member B.

[0028] Figure 5 (b) is a top view of the carrier B.

[0029] Figure 6 (a) is a three-dimensional view of the outer friction plate.

[0030] Figure 6 (b) is a top view of the outer friction plate.

[0031] Figure 6 (c) is the front view of the outer friction plate.

[0032] Figure 7 (a) is a three-dimensional view of the inner friction plate.

[0033] Figure 7 (b) is a top view of the inner friction plate.

[0034] Figure 7 (c) is the front view of the inner friction plate.

[0035] Figure 8 It is a 3D view of the friction plate or viscoelastic material.

[0036] Fig. 9 is a 3D view of the lever.

[0037] Fig.10 (a) is a three-dimensional view of the disc spring.

[0038] Fig.10 (b) is a top view of the disc spring string assembly.

[0039] Fig.11 (a) is a schematic diagram of the hysteresis curve of the displacement amplification type self-resetting shear damper of the present invention (when the partition is a friction plate).

[0040] Fig.11 (b) is a schematic diagram of the hysteresis curve of the displacement amplification type self-resetting shear damper of the present invention (when the partition is a viscoelastic material).

[0041] List of Figure Symbols:

[0042] 1. Bearing member A; 2. Bearing member B; 3. Outer friction plate; 4. Inner friction plate; 5. Lever member; 6. Partition plate; 7. Ordinary bolt; 7a. First bolt; 7b. Second bolt; 7c. Third bolt; 8. Prestressed bolt; 9. Disc spring string combination; 10. Friction slope; 11. End plate A; 12. Support plate; 13. End plate B; 14. Force transmission plate; 15. Groove. Implementation

[0043] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0044] As attached Figure 1 , Figure 2 , Figure 3 As shown, the displacement amplification type self-resetting shear damper includes a bearing member A1, a bearing member B2, an outer friction plate 3, an inner friction plate 4, a lever member 5, a partition plate 6, ordinary bolts 7, prestressed bolts 8, and a disc spring string combination 9.

[0045] As attached Figure 4 As shown in (a), the bearing member A1 includes mutually perpendicular end plates A11 and an inner support plate 12; a groove 15 is provided between the support plate 12 and the end plate A11, and the bearing member B2 includes mutually perpendicular end plates B13 and two inner force transmission plates 14; as shown in the attached Figure 6 (a) Figure 7 As shown in (a), the outer friction plate 3 and the inner friction plate 4 both have friction slopes 10 that fit each other;

[0046] The lever member 5 is two sets of steel plates, and a first connecting hole, a second connecting hole, and a third connecting hole are provided on the lever member 5, and the first bolt 7a, the second bolt 7b, and the third bolt 7c are connected correspondingly;

[0047] The end plate A11 is arranged vertically and parallel to the end plate B13, the support plate 12 is arranged in the middle position, the support plate 12 is provided with a partition plate 6 at the front and rear ends, the outer side of the partition plate 6 is the inner friction plate 4 and the outer friction plate 3, the lever member is arranged between the outer friction plate and the inner friction plate 4, the first bolt 7a passes through the groove 15 to connect the lever member 5 and the inner friction plate 4, the second bolt 7b connects the lever member 5 and the support plate 12, and the third bolt 7c connects the outer friction plate 3, the lever member 5 and the force transmission plate 14; the prestressed bolt 8 connects the outer friction plate 3, the inner friction plate 4, the support plate 12, and the partition plate 6, and the two ends of the prestressed bolt 8 are provided with a disc spring string combination 9.

[0048] As attached Figure 1 , Figure 2As shown, the bearing member A1 and the lever member 5, the bearing member B2 and the lever member 5, and the inner friction plate 4 and the lever member 5 are all connected by ordinary bolts 7. The bearing member A1, the bearing member B2 and the inner friction plate 4 form a lever system along the lever member 5. After the bearing member B2 and the bearing member A1 undergo vertical relative displacement, the inner friction plate 4 is pulled to produce a larger vertical displacement, resulting in a displacement amplification effect.

[0049] As attached Figure 1 , Figure 2 As shown, the friction slopes 10 of the inner friction plate 4 and the outer friction plate 3 fit each other, and the inner friction plate 4 and the outer friction plate 3 have initial shear bearing capacity under the action of the disc spring string 9 combination with initial pre-pressure; when the inner friction plate 4 and the outer friction plate 3 undergo vertical relative displacement, the outer friction plate 3 is pushed outward along the friction slope 10, further compressing the disc spring string 9 combination, generating axial compression elastic deformation, and after the external shear load of the bearing member A1 and the bearing member B2 is unloaded, the vertical relative displacement between the inner friction plate 4 and the outer friction plate 3 is gradually restored, and the axial compression elasticity of the disc spring string combination 9 is automatically restored, thereby realizing the self-resetting function of the damper.

[0050] As attached Figure 1 , Figure 2 , Figure 8 As shown, a friction plate or viscoelastic material is used as a partition 6 between the inner friction plate 4 and the support plate 12. When the partition 6 is a friction plate, the inner friction plate 4 and the support plate 12 produce relative friction slip with the friction plate under the drive of shear load, thereby realizing displacement-related energy consumption; when the partition 6 is a viscoelastic material, the two side surfaces of the viscoelastic material are respectively adhered to the inner friction plate 4 and the support plate 12, and the inner friction plate 4 and the support plate 12 produce vertical relative displacement under the drive of shear load, driving the viscoelastic material to undergo shear deformation, thereby realizing displacement and speed-related energy consumption.

[0051] As attached Figure 1 , Figure 2 As shown, the prestressed bolt 8 passes through and compresses the disc spring string combination 9, the outer friction plate 3, the lever member 5, the inner friction plate 4, the partition plate 6, and the support plate 12 in sequence, so that the entire damper has a larger nonlinear stiffness and bearing capacity, which makes up for the inherent deficiency of the self-resetting structure that the connection constraints of the components are relaxed due to the swing self-resetting mechanism, resulting in a lower structural stiffness.

[0052] The outer friction plate 3 and the inner friction plate 4 are provided with long holes, which are used to enable the two to slide relative to each other. In addition, a long hole is also provided in the middle of the partition plate 6. When the partition plate 6 is a viscoelastic material, it needs to be double-sidedly pasted between the support plate 12 and the inner friction plate 3 to achieve displacement and speed-related energy consumption, so a long hole is required; when the partition plate 6 is a friction plate, it does not need to be pasted, and it can slide freely between the support plate 12 and the inner friction plate 3 to achieve friction energy consumption, so it can be a long hole or a round hole. Considering the unified form of the two, long holes are used for both.

[0053] As attached Fig.10 (a) Fig.10 As shown in (b), the elastic stiffness and initial preload of the disc spring string combination 9, the slope and friction coefficient of the friction slope 10, the arm length of the lever member 5 and other parameters can be reasonably designed to achieve the purpose of adjusting the hysteresis curve performance parameters of the damper, so as to realize the shear damper's more ideal self-resetting ability, energy dissipation capacity, variable nonlinear stiffness capacity, etc.

[0054] As attached Fig.11 (a) Fig.11 As shown in (b), the structural hysteresis curve presents a typical flag-shaped shape, with good self-reset and energy dissipation capabilities. Fig. 9 As shown, the force arm of the bearing member A1 is recorded as L A , the force arm of the bearing member B2 is recorded as L B ,but n = L A / L B , represents the arm ratio of the lever system formed by the bearing member A1, the bearing member B2 and the inner friction plate 4 along the lever member 5. The vertical relative displacement of the shear damper between the bearing member A1 and the bearing member B2 is D / ( n +1), the vertical relative displacement can be D The corresponding shear bearing capacity and energy dissipation capacity are magnified as n +1 times the effect.

[0055] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. Displacement amplification type self-resetting shear damper, characterized in that: include: A bearing member A, a bearing member B, an outer friction plate, an inner friction plate, a lever member, a partition plate, a prestressed bolt and a disc spring string assembly; The bearing member A comprises an end plate A and an inner support plate which are perpendicular to each other; a groove is provided between the support plate and the end plate A; the bearing member B comprises an end plate B and two inner force transmission plates which are perpendicular to each other; the outer friction plate and the inner friction plate both have friction slopes which fit each other; a partition is provided between the inner friction plate and the support plate, and the partition is made of a friction plate or a viscoelastic material; The lever member is two sets of steel plates, and a first connecting hole, a second connecting hole and a third connecting hole are provided on the lever member, and the first bolt, the second bolt and the third bolt are connected correspondingly; The end plate A and the end plate B are arranged vertically and parallelly, the support plate is arranged in the middle position, the front and rear ends of the support plate are provided with partitions, the outer side of the partition is the inner friction plate and the outer friction plate, the lever member is arranged between the outer friction plate and the inner friction plate, the first bolt passes through the groove to connect the lever member and the inner friction plate, the second bolt connects the lever member and the support plate, and the third bolt connects the outer friction plate, the lever member and the force transmission plate; the prestressed bolt connects the outer friction plate, the inner friction plate, the support plate and the partition, and the two ends of the prestressed bolt are provided with a disc spring string combination; Its working principle is: The bearing member A, bearing member B and inner friction plate form a lever system along the lever member. After a vertical relative displacement occurs between bearing member B and bearing member A, the inner friction plate is pulled to produce a larger vertical displacement, resulting in a displacement amplification effect. Since the friction slopes of the inner friction plate and the outer friction plate fit each other, when the inner friction plate and the outer friction plate undergo a vertical relative displacement, the outer friction plate is pushed outward along the friction slope, compressing the disc spring string combination to produce axial compression elastic deformation. After the external shear load of bearing member A and bearing member B is unloaded, the vertical relative displacement between the inner friction plate and the outer friction plate is gradually restored, and the axial compression elasticity of the disc spring string combination is automatically restored, thereby realizing the self-resetting function of the damper.

2. The displacement amplification type self-resetting shear damper according to claim 1, characterized in that: When the partition adopts a friction plate, the inner friction plate and the support plate produce relative friction slip with the friction plate under the drive of shear load, realizing displacement-related energy dissipation; when the viscoelastic material is adopted, the two sides of the viscoelastic material are respectively pasted on the inner friction plate and the support plate, and the inner friction plate and the support plate produce vertical relative displacement under the drive of shear load, driving the viscoelastic material to undergo shear deformation, thereby realizing displacement and speed-related energy dissipation.

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