Novel staged yield damper

Abstract

The invention belongs to the technical field of civil engineering energy dissipation and shock absorption, and particularly relates to a novel staged yield damper. The damper is composed of an upper connecting plate (1), a lower connecting plate (2), a first-order yield energy dissipation steel plate (3), a second-order yield energy dissipation steel plate (4), hoops (5) and triangular stiffening ribs (6). The damper composed of the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) yields in stages under different fortification intensity levels. The reserved space interval at the upper end of the second-order yield energy dissipation steel plate (4) can be self-defined according to the use requirement of a user, it is guaranteed that the second-order yield energy dissipation steel plate (4) has enough deformation space when bending deformation occurs, the energy dissipation performance of the damper under different yield displacements is changed, and the damper has the simple and easy-to-transform performance to meet different requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of energy dissipation and vibration reduction in civil engineering, and in particular relates to a novel staged yield damper. Background Art

[0002] my country is a country with many earthquakes, and most of them are shallow-source earthquakes with strong destructive power on the surface. We should increase the research efforts on earthquake resistance and disaster reduction technologies, vigorously promote and develop new energy dissipation and shock reduction technologies, and promote the development of engineering earthquake resistance and disaster prevention industries and technologies.

[0003] The existing metal yield damper has a simple structure, convenient processing, stable performance and strong energy dissipation capacity. However, its energy dissipation form is single, with only one yield stage, and lacks flexibility, making it difficult to adjust its yield force and yield displacement according to actual earthquake conditions. The existing staged yield damper has problems such as small yield force and small difference between the first-order and second-order yield displacements, making it difficult to apply to actual engineering. Summary of the invention

[0004] In view of the above deficiencies in the prior art, the present invention provides a novel staged yield damper.

[0005] The novel staged yield damper provided by the present invention comprises: an upper connecting plate, a lower connecting plate, a first-order yield energy dissipation steel plate, a second-order yield energy dissipation steel plate, a hoop, and a triangular stiffening rib.

[0006] Preferably, it also includes: the first-order yield energy-absorbing steel plate and the second-order yield energy-absorbing steel plate are arranged between the upper connecting plate and the lower connecting plate, and the hoop and the triangular stiffening rib are located between the upper connecting plate and the second-order yield energy-absorbing steel plate, wherein there is a reserved space gap between the second-order yield energy-absorbing steel plate and the hoop and the upper connecting plate.

[0007] Preferably, the space reserved between the second-order yield energy dissipation steel plate and the hoop and the upper connecting plate can be defined according to usage requirements.

[0008] Preferably, the shapes of the first-order yield energy dissipation steel plate and the second-order yield energy dissipation steel plate include any one of an I-shape, an H-shape, a C-shape, a Z-shape, an X-shape, and a rectangle.

[0009] Preferably, when the first-order yield energy dissipation steel plate and the second-order yield energy dissipation steel plate are in an I-shape, a horizontal stiffening rib and a vertical stiffening rib are respectively provided on both sides of the steel plate.

[0010] Preferably, the upper and lower ends of the first-order yield energy dissipation steel plate and the grooves of the upper connecting plate and the lower connecting plate are connected by full penetration welding.

[0011] Preferably, the lower end of the second-order yield energy dissipation steel plate is connected to the groove of the lower connecting plate by full penetration welding, and the upper end of the second-order yield energy dissipation steel plate is not restricted in displacement within a limited range (with reserved space interval).

[0012] Preferably, the triangular stiffening rib is connected to the second-order yield energy dissipation steel plate by groove penetration welding, the hoop is first connected to the groove of the triangular stiffening rib by groove penetration welding, and the hoop is then connected to the groove of the upper connecting plate by groove penetration welding.

[0013] Preferably, the first-order yield energy dissipation steel plate adopts low yield point steel with a yield strength of 100 to 225 MPa, and the yield strength of the second-order yield energy dissipation steel plate is 205 to 305 MPa.

[0014] The present invention has the following beneficial effects: 1) Yield in stages under different fortification intensity levels. When a frequent earthquake or fortification earthquake occurs, the first-order yield energy dissipation steel plate will undergo the first-stage yield energy dissipation; when a fortification earthquake or a rare earthquake or an extremely rare earthquake occurs, the second-order yield energy dissipation steel plate will begin to participate in energy dissipation and share the second-stage yield energy dissipation with the first-order yield energy dissipation steel plate.

[0015] 2) Easy to process, install and replace.

[0016] 3) Uniform stress distribution: By optimizing the edge shapes of the in-plane deformation energy dissipation sheet and the out-of-plane deformation energy dissipation sheet of the staged yield damper, the stress distribution can be made more uniform.

[0017] 4) The initial working displacement of the second-stage yield energy dissipation steel plate can be set independently, which has strong flexibility. The reserved space interval at the upper end of the second-order yield energy dissipation steel plate solves the problem of a small difference between the first-order and second-order yield displacements. When the horizontal displacement of the hoop (5) is less than the preset gap distance, the second-order yield energy dissipation steel plate (4) does not participate in the work; when the horizontal displacement of the hoop (5) is greater than the preset gap distance, the second-order yield energy dissipation steel plate (4) yields and dissipates energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, purposes and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the structure of a novel staged yield damper provided by the present invention; Figure 2 A left side view of a novel staged yield damper provided by the present invention; Figure 3 A front view of a novel staged yield damper provided by the present invention; Figure 4 A right side view of the novel staged yielding damper provided by the present invention; Figure 5 It is a hysteresis curve simulated in the finite element software ABAQUS according to an embodiment of the present invention; Figure 6 for Figure 5 Skeleton curve of the simulated hysteresis curve; In the figure: 1- Upper connecting plate; 2-Lower connecting plate; 3-First-order yield energy dissipation steel plate; 4-Second-order yield energy dissipation steel plate; 5- Hoop; 6-Triangular stiffening ribs. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0020] Figure 1 to Figure 4 The novel staged yield damper provided by the present invention comprises an upper connecting plate (1), a lower connecting plate (2), a first-order yield energy dissipation steel plate (3), a second-order yield energy dissipation steel plate (4), a hoop (5), and a triangular stiffening rib (6).

[0021] Further, Figure 1 to Figure 4 The novel staged yield damper shown further comprises: the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) are arranged between the upper connecting plate (1) and the lower connecting plate (2); the sleeve (5) and the triangular stiffening rib (6) are located between the upper connecting plate (1) and the second-order yield energy dissipation steel plate (4); and a reserved space is provided between the second-order yield energy dissipation steel plate (4) and the sleeve (5) and the upper connecting plate (1). The reserved space at the upper end of the second-order yield energy dissipation steel plate (4) solves the problem of a small difference between the first-order and second-order yield displacements.

[0022] Preferably, the space interval reserved between the second-order yielding energy dissipation steel plate (4), the hoop (5) and the upper connecting plate (1) can be defined according to the use requirements. The initial working displacement of the second-stage yielding energy dissipation steel plate (4) can be set independently, which has strong flexibility.

[0023] The present invention uses a first-order yielding energy absorbing steel plate (3) and a second-order yielding energy absorbing steel plate (4) to form a damper with different yield degrees in stages under different fortification intensity levels. When a frequent earthquake or a fortification earthquake occurs, the first-order yielding energy absorbing steel plate (3) performs the first-stage yielding energy dissipation; when a fortification earthquake or a rare earthquake or an extremely rare earthquake occurs, the second-order yielding energy dissipation steel plate (4) begins to participate in energy dissipation and shares the second-stage yielding energy dissipation with the first-order yielding energy dissipation steel plate (3). When the horizontal displacement of the hoop (5) is less than the preset gap distance, the second-order yielding energy dissipation steel plate (4) does not participate in the work; when the horizontal displacement of the hoop (5) is greater than the preset gap distance, the second-order yielding energy dissipation steel plate (4) yields and dissipates energy. The new staged yielding damper in the present invention is easy to process, install and replace, and has uniform stress distribution.

[0024] like Figure 2 As shown, the shape of the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) includes any one of an I-shape, an H-shape, a C-shape, a Z-shape, an X-shape, and a rectangle. In the embodiment of the present invention, an I-shape is used as an example for specific description. It should be noted that the present invention does not limit the shape of the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4), and any technical solution using an H-shape, a C-shape, a Z-shape, an X-shape, and a rectangle is substantially the same as the technical solution in the present invention.

[0025] like Figure 1 As shown, when the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) are in an I-shape, a horizontal stiffening rib and a vertical stiffening rib are added on both sides of the steel plate.

[0026] Preferably, the upper and lower ends of the first-order yield energy dissipation steel plate (3) and the grooves of the upper connecting plate (1) and the lower connecting plate (2) are connected by full penetration welding.

[0027] Preferably, the lower end of the second-order yield energy dissipation steel plate (4) is connected to the groove of the lower connecting plate (2) by full penetration welding, and the upper end of the second-order yield energy dissipation steel plate (4) is not restricted in displacement within a limited range (with a reserved space interval).

[0028] Preferably, the triangular stiffening rib (6) is connected to the second-order yield energy dissipation steel plate (4) by groove penetration welding, the hoop (5) is first connected to the triangular stiffening rib (6) by groove penetration welding, and the hoop (5) is then connected to the upper connecting plate (1) by groove penetration welding.

[0029] Preferably, the first-order yield energy dissipation steel plate (3) is made of low yield point steel with a yield strength of 100 to 225 MPa, and the yield strength of the second-order yield energy dissipation steel plate (4) is 205 to 305 MPa.

[0030] The technical solution of the present invention is described in more detail below in conjunction with specific embodiments.

[0031] The first-order yield energy dissipation steel plate (3) is set to be 250 mm wide and 10 mm thick, the second-order yield energy dissipation steel plate (4) is set to be 300 mm wide and 6 mm thick, and the reserved space between the second-order yield energy dissipation steel plate (4) and the hoop (5) is 6 mm. Numerical simulation is performed using finite element software ABAQUS, thereby obtaining the hysteresis curve of the staged yield damper and the skeleton curve under the action of low-cycle reciprocating load as shown in Figure 5 , Figure 6 shown.

[0032] The present invention can define the reserved space interval on the upper end of the second-order yield energy dissipation steel plate according to the user's usage requirements, ensure that the second-order yield energy dissipation steel plate has sufficient deformation space when bending deformation occurs, change the energy dissipation performance of the damper under different yield displacements, and has simple and easy-to-modify performance to meet different needs.

[0033] The above is an explanation of the specific embodiments of the present invention, but does not limit the scope of the present invention. Those skilled in the art may make different forms of equivalent substitutions, adjustments or improvements within the framework of the claims, which will not affect the essence of the present invention and should be included in the scope of the present invention.

Claims

1. A novel staged yield damper, characterized in that: The damper comprises an upper connecting plate (1), a lower connecting plate (2), a first-order yielding energy absorbing steel plate (3), a second-order yielding energy absorbing steel plate (4), a hoop (5), and a triangular stiffening rib (6).

2. The novel staged yield damper according to claim 1 is characterized in that: Also includes: The first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) are arranged between the upper connecting plate (1) and the lower connecting plate (2), and the hoop (5) and the triangular stiffening rib (6) are located between the upper connecting plate (1) and the second-order yield energy dissipation steel plate (4), wherein a reserved space is provided between the second-order yield energy dissipation steel plate (4) and the hoop (5) and the upper connecting plate (1).

3. The novel staged yield damper according to claim 2 is characterized in that: The space interval reserved between the second-order yield energy dissipation steel plate (4), the hoop (5) and the upper connecting plate (1) can be defined according to usage requirements.

4. The novel staged yield damper according to claim 1 or claim 2, characterized in that: The shapes of the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) include any one of an I-shape, an H-shape, a C-shape, a Z-shape, an X-shape, and a rectangle.

5. The novel staged yield damper according to claim 4 is characterized in that: When the first-order yield energy dissipation steel plate (3) and the second-order yield energy dissipation steel plate (4) are in an I-shape, a horizontal stiffening rib and a vertical stiffening rib are respectively provided on both sides of the steel plate.

6. The novel staged yield damper according to claim 1 or claim 2, characterized in that: The upper and lower ends of the first-order yield energy dissipation steel plate (3) are connected to the grooves of the upper connecting plate (1) and the lower connecting plate (2) by full penetration welding.

7. The novel staged yield damper according to claim 1 or claim 2, characterized in that: The lower end of the second-order yield energy dissipation steel plate (4) is connected to the groove of the lower connection plate (2) by full penetration welding, and the upper end of the second-order yield energy dissipation steel plate (4) is not restricted in displacement within a limited range (with a reserved space interval).

8. The novel staged yield damper according to claim 1 or claim 2, characterized in that: The triangular stiffening rib (6) is connected to the second-order yield energy dissipation steel plate (4) by groove penetration welding, the hoop (5) is first connected to the triangular stiffening rib (6) by groove penetration welding, and the hoop (5) is then connected to the upper connecting plate (1) by groove penetration welding.

9. The novel staged yield damper according to claim 1 is characterized in that: The first-order yield energy dissipation steel plate (3) is made of low yield point steel with a yield strength of 100 to 225 MPa, and the second-order yield energy dissipation steel plate (4) has a yield strength of 205 to 305 MPa.

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