Controllable strain amplitude energy dissipation steel damper

Abstract

The application relates to a controllable strain amplitude energy dissipation steel damper, which comprises a first flat plate and a second flat plate arranged in parallel, the first flat plate is connected with a main beam, the second flat plate is connected with a pier or a bent cap, a plastic energy dissipation component is arranged between the first flat plate and the second flat plate, the plastic energy dissipation component comprises plastic energy dissipation strips alternately wound on the first flat plate and the second flat plate, and the two ends of the plastic energy dissipation strips are fixedly connected with the second flat plate; when an earthquake occurs, the first flat plate and the second flat plate relatively dislocate, the plastic energy dissipation strips plastically deform and limit the relative dislocation of the first flat plate and the second flat plate. Compared with the prior art, the damper has the advantages of controllable strain amplitude, adjustable maximum stroke, good fatigue performance, simple structure, strong economy, convenient maintenance and repair after the earthquake, only the bolts of the first flat plate and the second flat plate need to be screwed off, and the plastic energy dissipation strips need to be replaced, and the damper is suitable for promotion and application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of civil engineering, and relates to a controllable strain amplitude energy dissipation steel damper. BACKGROUND

[0002] Increasing structural damping is an important means of structural seismic mitigation design. Currently, commonly used dampers include hydraulic viscous dampers, steel dampers and friction dampers. Among them, steel dampers are widely used due to their low cost and stable performance. According to structural characteristics, construction conditions and engineering environment, researchers and engineering designers at home and abroad have proposed various steel dampers, such as rectangular plate steel dampers, triangular plate steel dampers, X-shaped steel dampers and rod-shaped steel dampers. The working principle is to dissipate energy through the yield of steel after entering the plastic state. However, the current steel dampers generally have insufficient low-cycle fatigue performance. Under strong earthquakes, the displacement of the damper is large, which causes the steel to be in a high strain amplitude (the difference between the maximum strain and the minimum strain) state, and the failure cycle number of the damper is correspondingly reduced. Therefore, it is necessary to increase the size of the damper to reduce the strain amplitude of the steel under earthquakes. This method is obviously not economical and is limited by the installation space of the damper, and it is difficult to maintain after an earthquake. SUMMARY

[0003] The purpose of the present application is to provide a controllable strain amplitude energy dissipation steel damper to overcome the defects of high strain amplitude, insufficient low-cycle fatigue performance, poor economy or difficulty in maintenance after an earthquake of the steel damper in the prior art. The present application provides a damper with controllable strain amplitude, adjustable maximum stroke, suitable for large displacement under earthquakes, and convenient maintenance after an earthquake, namely a controllable strain amplitude energy dissipation steel damper.

[0004] The purpose of the present application can be achieved by the following technical solutions:

[0005] A controllable strain amplitude energy dissipation steel damper, comprising a first flat plate and a second flat plate arranged in parallel, the first flat plate is connected with a main beam, the second flat plate is connected with a pier or a bent cap, a plastic energy dissipation component is arranged between the first flat plate and the second flat plate, the plastic energy dissipation component comprises plastic energy dissipation strips alternately wound on the first flat plate and the second flat plate, and both ends of the plastic energy dissipation strips are fixedly connected with the second flat plate, when an earthquake occurs, the first flat plate and the second flat plate move relatively, the plastic energy dissipation strips are plastically deformed and limit the relative movement of the first flat plate and the second flat plate.

[0006] Further, the first flat plate and the second flat plate each comprise a flat section and a circular arc section located at the longitudinal ends of the flat section, the circular arc section protrudes outward, and the plastic energy dissipation strips are wound along the transverse direction of the flat section.

[0007] Further, the plastic energy dissipation strip is provided with one or several strips, and when the plastic energy dissipation strip is provided with several strips, each plastic energy dissipation strip is alternately wound on the first plate and the second plate along the length direction of the first plate and the second plate.

[0008] Further, a cable is further provided between the first plate and the second plate, and the winding mode and the fixing mode of the cable are the same as those of the plastic energy dissipation strip. When an extremely rare earthquake occurs and the displacement of the damper exceeds the maximum stroke, the high-strength flexible cable can provide additional limiting action.

[0009] Further, a fourth plate connected with the main beam is arranged above the first plate, the lower surface of the fourth plate is provided with a groove, and the two ends of the first plate are provided with limiting plates, the upper end of the limiting plate is clamped into the groove and can move in the vertical direction inside the groove.

[0010] Further, the limiting plate is in the shape of an I-beam, and the edge of the groove extends inward and abuts against the vertical section of the limiting plate.

[0011] Further, the limiting plate is bolted with the first plate.

[0012] Further, the fourth plate is bolted with the main beam.

[0013] Further, a roller body is arranged at the longitudinal two ends of the first plate, the central axis of the roller body is parallel to the transverse direction of the first plate, and the plastic energy dissipation strip is wound on the first plate around the roller body.

[0014] Further, the first fixed plate is bolted with the main beam, and the roller body is connected with the first fixed plate.

[0015] Further, the longitudinal two ends of the first plate are adapted to the shape of the roller body.

[0016] Further, the first plate is bolted with the first fixed plate.

[0017] Further, the lower surface of the second plate is provided with several grooves, and the plastic energy dissipation strip is wound on the second plate along the grooves.

[0018] Further, the lower surface of the second plate is connected with a third plate, and the third plate is provided with a bolt assembly for fixing the plastic energy dissipation strip on the second plate.

[0019] Further, the third plate is bolted with the second plate.

[0020] Further, the second flat plate is connected with a second fixing plate, and the second fixing plate is bolted with the pier or the bent cap.

[0021] Further, the second flat plate is bolted with the second fixing plate.

[0022] Further, the plastic energy dissipation strip is in a cylindrical strip shape or a cuboid strip shape.

[0023] Further, the width of the first flat plate can be designed according to the relative displacement of the first flat plate and the second flat plate under the earthquake.

[0024] Further, the plastic energy dissipation strip can be made of energy dissipation metal materials such as steel, aluminum, copper and shape memory alloy, or can be a combination structure of an energy dissipation core material and a fiber reinforced polymer (FRP) outer package.

[0025] The strain amplitude of the plastic energy dissipation strip of the damper can be designed by adjusting the radius of the circular arc segment of the first flat plate and the second flat plate, and the maximum stroke of the damper can be adjusted by changing the width of the first flat plate and the second flat plate.

[0026] When the earthquake occurs, the first flat plate and the second flat plate are relatively dislocated, driving the plastic energy dissipation strip to deform and dissipate energy, and maintaining the stability of the bridge. Since the two ends of the first flat plate contacting the plastic energy dissipation strip are in a circular arc shape, the curvature of the plastic energy dissipation strip in the circular arc segment is the inverse of the radius of the circular arc segment, and the curvature of the plastic energy dissipation strip in the flat segment is 0. When the first flat plate and the second flat plate are relatively dislocated, the plastic energy dissipation strip originally in the flat segment moves to the circular arc segment, at this time, the plastic energy dissipation strip will be plastically deformed, and the maximum strain of the plastic energy dissipation strip is only related to the curvature radius of the plastic energy dissipation strip. The maximum stroke of the damper is half of the sum of the width of the first flat plate and the width of the second flat plate. The damper can be used as a transverse damper of a long bridge, and the plastic energy dissipation strip arranged can dissipate energy in the transverse direction and freely move in the longitudinal direction, allowing the temperature deformation of the bridge in the longitudinal direction under normal use conditions.

[0027] The damper can further be provided with a fourth plate connected with the main beam above the first plate, the lower surface of the fourth plate is provided with a groove, and the upper end of the limiting plate at the two ends of the first plate is clamped into the groove and can move in the vertical direction inside the groove. This design has certain constraint effect on the vertical displacement of the first plate of the damper, and the constraint stiffness increases with the increase of the vertical displacement, and when used in combination with the support, the disengagement of the support can be prevented. In addition, when an extremely rare earthquake occurs and the displacement of the damper exceeds the designed maximum stroke, the high-strength cable arranged can limit the first plate and the second plate. In post-earthquake maintenance and repair, only the bolts of the first plate and the second plate need to be unscrewed, and the plastic energy dissipation strip can be replaced.

[0028] Compared with the prior art, the damper has the following advantages:

[0029] (1) The strain amplitude of the plastic energy dissipation strip of the damper can be designed by adjusting the radius of the circular arc segment of the first plate and the second plate, and the maximum stroke of the damper can be adjusted by the width of the first plate and the second plate, so that the strain amplitude can be controlled, the maximum stroke can be adjusted, and the low-cycle fatigue performance is improved;

[0030] (2) The plastic energy dissipation strip arranged in the damper can dissipate energy in the transverse direction of the bridge and freely move in the longitudinal direction of the bridge, so as to adapt to the temperature deformation of the longitudinal direction of the bridge;

[0031] (3) The damper further comprises a high-strength cable arranged between the first plate and the second plate, the winding mode and the fixing mode of the cable are the same as those of the plastic energy dissipation strip, and when an extremely rare earthquake occurs and the displacement of the damper exceeds the maximum stroke, the high-strength cable can provide additional limiting effect;

[0032] (4) The damper has simple structure, strong economy, convenient post-earthquake maintenance and repair, only the bolts of the first plate and the second plate need to be unscrewed, and the plastic energy dissipation strip can be replaced, so it is suitable for promotion and application. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structure schematic view of the controlled strain amplitude energy dissipation steel damper of Example 1;

[0034] Figure 2 It is a structure schematic view of the plastic energy dissipation strip;

[0035] Figure 3 It is a structure schematic view of the second plate;

[0036] Figure 4 It is a structure schematic view of the third plate;

[0037] Figure 5Structure diagram of the controlled strain amplitude energy dissipation steel damper of Example 2;

[0038] Figure 6 Structure diagram of the first flat plate of Example 2;

[0039] Figure 7 Structure diagram of the controlled strain amplitude energy dissipation steel damper of Example 3;

[0040] Figure 8 Structure diagram of the limiting plate of Example 3;

[0041] Figure 9 Structure diagram of the fourth flat plate of Example 3;

[0042] Figure 10 The schematic diagram of the damper of the application when the relative displacement displacement of the first flat plate and the second flat plate reaches the maximum in the earthquake.

[0043] Marking description in the figure:

[0044] 1-first fixing bolt, 2-first fixing plate, 3-first flat plate, 4-second fixing bolt, 5-second fixing plate, 6-second flat plate, 7-third bolt, 8-plastic energy dissipation strip, 9-third flat plate, 10-first bolt hole, 11-second bolt hole, 12-limiting plate, 13-fourth flat plate, 14-roller body. DETAILED DESCRIPTION

[0045] The application will be described in detail below with reference to the drawings and specific embodiments. The embodiments are implemented on the premise of the technical scheme of the application, and detailed implementation modes and specific operation processes are given, but the protection scope of the application is not limited to the following embodiments.

[0046] In the following embodiments or examples, if there is no special description of the function components or structures, it means that they are all conventional components or conventional structures adopted in the field to realize the corresponding functions.

[0047] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0048] In the description of the application, unless otherwise specified, the terms "first", "second", "third" and the like are only for description purpose, and cannot be understood as indicating or implying relative importance.

[0049] In order to overcome the defects of high strain amplitude, insufficient low-cycle fatigue performance, poor economy and difficult post-earthquake maintenance of the steel damper in the prior art, the present application provides a damper with controllable strain amplitude, adjustable maximum stroke, adaptability to large displacement under earthquake and convenient post-earthquake maintenance, namely a controllable strain amplitude energy dissipation steel damper, please refer to Figure 1 、 Figure 5 and Figure 7 The damper comprises a first flat plate 3 and a second flat plate 6 arranged in parallel, the first flat plate 3 is connected with a main beam, the second flat plate 6 is connected with a pier or a bent cap, a plastic energy dissipation component is arranged between the first flat plate 3 and the second flat plate 6, the plastic energy dissipation component comprises plastic energy dissipation strips 8 wound alternately on the first flat plate 3 and the second flat plate 6, and both ends of the plastic energy dissipation strips 8 are fixedly connected with the second flat plate 6, when an earthquake occurs, the first flat plate 3 and the second flat plate 6 relatively dislocate, the plastic energy dissipation strips 8 plastically deform and limit the relative dislocation of the first flat plate 3 and the second flat plate 6.

[0050] In some specific embodiments, please refer to Figure 1 、 Figure 3 The first flat plate 3 and the second flat plate 6 each comprise a flat section and a circular arc section located at both longitudinal ends of the flat section, the circular arc section protrudes outward, and the plastic energy dissipation strips 8 are wound along the transverse direction of the flat section.

[0051] In some specific embodiments, the plastic energy dissipation strips 8 are provided in one or several strips, and when the plastic energy dissipation strips 8 are provided in several strips, each plastic energy dissipation strip 8 is wound alternately on the first flat plate 3 and the second flat plate 6 along the length direction of the first flat plate 3 and the second flat plate 6.

[0052] In some specific embodiments, a cable is further arranged between the first flat plate 3 and the second flat plate 6, and the winding mode and the fixing mode of the cable are the same as those of the plastic energy dissipation strips 8. When an extremely rare earthquake occurs and the displacement of the damper exceeds the maximum stroke, the high-strength cable can provide additional limiting action.

[0053] In some specific embodiments, please refer to Figure 7 and Figure 9 A fourth flat plate 13 connected with the main beam is arranged above the first flat plate 3, a recess is arranged on the lower surface of the fourth flat plate 13, limit plates 12 are arranged at both ends of the first flat plate 3, and the upper ends of the limit plates 12 are clamped into the recess and can move in the vertical direction inside the recess.

[0054] In more specific embodiments, please refer to Figure 8The limiting plate 12 is in the shape of an I-beam, and the edges of the groove extend inward and abut against the vertical section of the limiting plate 12.

[0055] In a more specific embodiment, the limiting plate 12 is bolted to the first flat plate 3.

[0056] In a more specific embodiment, the fourth flat plate 13 is bolted to the main beam.

[0057] In some specific embodiments, as shown in Figure 5 The first flat plate 3 is provided with a roller body 14 at both longitudinal ends, the central axis of the roller body 14 is parallel to the transverse direction of the first flat plate 3, and the plastic energy dissipation strip 8 is wound around the roller body 14 on the first flat plate 3.

[0058] In a more specific embodiment, the first flat plate 3 is provided with a first fixed plate 2 at both transverse ends, the first fixed plate 2 is connected to the main beam by a first fixed bolt 1, and the roller body 14 is connected to the first fixed plate 2.

[0059] In a more specific embodiment, as shown in Figure 6 The longitudinal ends of the first flat plate 3 are adapted to the shape of the roller body 14.

[0060] In a more specific embodiment, as shown in Figure 1 and Figure 7 The first flat plate 3 is connected to the first fixed plate 2 by a second fixed bolt 4.

[0061] In some specific embodiments, as shown in Figure 3 The lower surface of the second flat plate 6 is provided with a plurality of grooves, and the plastic energy dissipation strip 8 is wound around the second flat plate 6 along the grooves.

[0062] In some specific embodiments, as shown in Figure 1 , Figure 4 , Figure 5 , Figure 7 The lower surface of the second flat plate 6 is connected to a third flat plate 9, the third flat plate 9 is provided with a bolt assembly for fixing the plastic energy dissipation strip 8 on the second flat plate 6, and the third flat plate 9 is provided with a corresponding second bolt hole 11.

[0063] In a more specific embodiment, the third flat plate 9 is bolted to the second flat plate 6, and the third flat plate 9 is provided with a corresponding first bolt hole 10.

[0064] In some specific embodiments, as shown in Figure 1 , Figure 5 , Figure 7The second flat plate 6 is connected to a second fixing plate 5, which is connected to the bridge pier or cap beam.

[0065] In a more specific embodiment, the second flat plate 6 is connected to the second fixing plate 5 by a third bolt 7, and the second fixing plate 5 is bolted to the bridge pier or cap beam.

[0066] In some specific embodiments, the plastic energy-dissipating strip 8 is a cylindrical strip or a cuboid strip.

[0067] In some specific implementations, the width of the first plate 3 can be designed based on the relative displacement between the first plate 3 and the second plate 6 under an earthquake.

[0068] In some specific embodiments, the plastic energy-dissipating strip 8 can be made of energy-dissipating metal materials such as steel, aluminum, copper, and shape memory alloys, or it can be a combination structure of energy-dissipating core material wrapped with fiber-reinforced polymer (FRP).

[0069] Example 1:

[0070] This embodiment provides a controllable strain amplitude energy-dissipating steel damper, such as... Figure 1 As shown, the damper includes a first fixing bolt 1, a first fixing plate 2, a first plate 3, a second fixing bolt 4, a second fixing plate 5, a second plate 6, a third bolt 7, a plastic energy dissipation strip 8, and a third plate 9.

[0071] The first plate 3 and the second plate 6 are placed parallel to each other vertically. The first plate 3 is connected to the first fixed plate 2 by the second fixed bolt 4, and the first fixed plate 2 is connected to the main beam by the first fixed bolt 1. The second plate 6 is connected to the second fixed plate 5 by the third bolt 7, and the second fixed plate 5 is bolted to the pier or cap beam. Figure 1 and Figure 3 As shown, both the first plate 3 and the second plate 6 include a straight section and arc sections located at both ends of the longitudinal direction of the straight section, with the arc sections protruding outward.

[0072] like Figure 1 and Figure 2 As shown, a single plastic energy-dissipating strip 8 is alternately wound around the first plate 3 and the second plate 6, as follows: Figure 3 As shown, the lower surface of the second plate 6 is provided with several grooves, and the plastic energy-dissipating strip 8 is wound around the second plate 6 along the grooves. In this embodiment, the plastic energy-dissipating strip 8 is a cylindrical strip made of aluminum.

[0073] like Figure 1 As shown, a third plate 9 is connected to the lower surface of the second plate 6, and the third plate 9 is bolted to the second plate 6, as shown. Figure 4As shown, the third flat plate 9 is provided with a corresponding first bolt hole 10; the third flat plate 9 is provided with a bolt assembly for fixing the two ends of the plastic energy dissipation strip 8 on the second flat plate 6, such as Figure 4 As shown, the third flat plate 9 is provided with a corresponding second bolt hole 11.

[0074] In the post-earthquake maintenance and repair of the damper of the embodiment, only the bolts of the first flat plate 3 and the second flat plate 6 need to be unscrewed, and the plastic energy dissipation strip 8 can be replaced.

[0075] The strain amplitude of the plastic energy dissipation strip 8 of the embodiment can be designed by adjusting the radius of the circular arc segment of the first flat plate 3 and the second flat plate 6, and the maximum stroke of the damper can be adjusted by changing the width of the first flat plate 3 and the second flat plate 6. During an earthquake, the first flat plate 3 and the second flat plate 6 move relatively and drive the plastic energy dissipation strip 8 to deform and dissipate energy, thereby maintaining the stability of the bridge. Since the two ends of the first flat plate 3 that contact the plastic energy dissipation strip 8 are circular arc-shaped, the curvature of the plastic energy dissipation strip 8 located in the circular arc segment is the inverse of the radius of the circular arc segment, and the curvature of the plastic energy dissipation strip 8 located in the flat segment is 0. When the first flat plate 3 and the second flat plate 6 move relatively, the plastic energy dissipation strip 8 originally located in the flat segment moves to the circular arc segment, at which time the plastic energy dissipation strip 8 will undergo plastic deformation, and the maximum strain of the plastic energy dissipation strip 8 is only related to the curvature radius of the plastic energy dissipation strip 8, such as Figure 10 As shown, the maximum stroke of the damper of the embodiment is half the sum of the width of the first flat plate 3 and the width of the second flat plate 6.

[0076] The width of the first flat plate 3 of the embodiment can be designed according to the relative displacement of the first flat plate 3 and the second flat plate 6 under an earthquake.

[0077] The damper of the embodiment can be used as a transverse bridge damper for a long and large bridge, and the plastic energy dissipation strip 8 provided can dissipate energy in the transverse bridge direction and freely move in the longitudinal bridge direction, thereby allowing temperature deformation to occur under normal use conditions of the bridge in the longitudinal bridge direction.

[0078] Embodiment 2:

[0079] Compared with Embodiment 1, most of them are the same, except that in the embodiment, as shown in Figure 5 A roller body 14 is arranged at the longitudinal two ends of the first flat plate 3, the roller body 14 is connected with the first fixed plate 2, the central axis of the roller body 14 is parallel to the transverse direction of the first flat plate 3, and the plastic energy dissipation strip 8 is wound around the roller body 14 on the first flat plate 3. As shown in Figure 6 The longitudinal two ends of the first flat plate 3 are adapted to the shape of the roller body 14.

[0080] When the first plate 3 and the second plate 6 are relatively dislocated in the embodiment 1, the plastic energy dissipation strip 8 and the first plate 3 will slide and rub. In the embodiment, the roller body 14 is arranged to make the plastic energy dissipation strip 8 and the roller body 14 roll and rub, reduce the friction, make the energy dissipation of the damper only provided by the yield of the plastic energy dissipation strip 8, and facilitate the design.

[0081] Embodiment 3

[0082] Compared with the embodiment 1, most of them are the same, except that in the embodiment, as shown in Figure 7 , the first fixed plate 2 is not arranged, and the limiting plate 12 and the fourth plate 13 are additionally arranged. The fourth plate 13 is arranged above the first plate 3, and the fourth plate 13 is connected with the main beam through the first fixed bolt 1. As shown in Figure 9 , the lower surface of the fourth plate 13 is provided with a groove. As shown in Figure 8 , the transverse two ends of the first plate 3 are provided with the limiting plate 12 in the shape of an I-beam. The lower end of the limiting plate 12 is connected with the first plate 3 through the second fixed bolt 4. The groove edge of the fourth plate 13 extends to the inner side and abuts against the vertical section of the limiting plate 12. The upper end of the limiting plate 12 is clamped into the groove, and the upper end of the limiting plate 12 can move in the vertical direction inside the groove.

[0083] The design has a certain constraint effect on the vertical displacement of the first plate 3. The constraint stiffness increases with the increase of the vertical displacement. When the damper is used with the support, the damper can prevent the support from being empty. In addition, the design allows the damper to have a small vertical displacement, which can improve the applicability and practicability of the damper.

[0084] Embodiment 4

[0085] The same as the embodiment 1, most of them are the same, except that in the embodiment, the high-strength cable is arranged between the first plate 3 and the second plate 6. The winding mode and the fixing mode of the cable are the same as those of the plastic energy dissipation strip 8. When the damper displacement exceeds the maximum stroke in the extremely rare earthquake, the high-strength cable can provide additional limiting effect.

[0086] Embodiment 5

[0087] The same as the embodiment 1, most of them are the same, except that in the embodiment, a plurality of plastic energy dissipation strips 8 are arranged. Each plastic energy dissipation strip 8 is alternately wound on the first plate 3 and the second plate 6 along the length direction of the first plate 3 and the second plate 6.

[0088] The foregoing description of the embodiments has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the application to the precise form disclosed. Modifications and variations are possible in light of the above teachings or can be acquired from practice of the application. As well, the description is presented in the context of the preferred embodiments as a number of alternatives. It is not intended to limit the application to the precise form described.

Claims

1. A controllable strain amplitude energy-dissipating steel damper, characterized in that, It includes a first plate (3) and a second plate (6) placed parallel to each other. The first plate (3) is connected to the main beam, and the second plate (6) is connected to the pier or cap beam. A plastic energy dissipation component is provided between the first plate (3) and the second plate (6). The plastic energy dissipation component includes plastic energy dissipation strips (8) alternately wound on the first plate (3) and the second plate (6). The two ends of the plastic energy dissipation strips (8) are fixedly connected to the second plate (6). When an earthquake occurs, the first plate (3) and the second plate (6) move relative to each other. The plastic energy dissipation strips (8) undergo plastic deformation and restrict the relative movement of the first plate (3) and the second plate (6). Both the first plate (3) and the second plate (6) include a straight section and arc sections located at both ends of the longitudinal direction of the straight section. The arc sections protrude outwards, and the plastic energy-dissipating strip (8) is wound transversely along the straight section. The plastic energy-dissipating strip (8) is provided as a single strip or several strips. When the plastic energy-dissipating strip (8) is provided as several strips, each plastic energy-dissipating strip (8) is alternately wound around the first plate (3) and the second plate (6) in sequence along the length direction of the first plate (3) and the second plate (6). The strain amplitude of the plastic energy dissipation strip (8) can be designed by adjusting the radius of the arc segment of the first plate (3) and the second plate (6), and the maximum stroke of the damper can be adjusted by changing the width of the first plate (3) and the second plate (6).

2. The controllable strain amplitude energy-dissipating steel damper according to claim 1, characterized in that, A cable is provided between the first plate (3) and the second plate (6), and the winding and fixing methods of the cable are the same as those of the plastic energy-dissipating strip (8).

3. The controllable strain amplitude energy-dissipating steel damper according to claim 1, characterized in that, A fourth plate (13) connected to the main beam is provided above the first plate (3). The lower surface of the fourth plate (13) is provided with a groove. Limiting plates (12) are provided at both ends of the first plate (3). The upper end of the limiting plate (12) is inserted into the groove and can move vertically inside the groove.

4. The controllable strain amplitude energy-dissipating steel damper according to claim 3, characterized in that, The limiting plate (12) is I-shaped, and the edge of the groove extends inward and abuts against the vertical section of the limiting plate (12).

5. A controllable strain amplitude energy-dissipating steel damper according to claim 1, characterized in that, Roller bodies (14) are provided at both longitudinal ends of the first plate (3). The central axis of the roller body (14) is parallel to the transverse direction of the first plate (3). The plastic energy-dissipating strip (8) is wound around the roller body (14) on the first plate (3).

6. A controllable strain amplitude energy-dissipating steel damper according to claim 5, characterized in that, A first fixing plate (2) is provided at both ends of the first flat plate (3). The first fixing plate (2) is connected to the main beam, and the roller body (14) is connected to the first fixing plate (2).

7. A controllable strain amplitude energy-dissipating steel damper according to claim 1, characterized in that, The lower surface of the second plate (6) is provided with several grooves, and the plastic energy-dissipating strip (8) is wound around the second plate (6) along the grooves.

8. A controllable strain amplitude energy-dissipating steel damper according to claim 1, characterized in that, A third plate (9) is connected to the lower surface of the second plate (6), and the third plate (9) is provided with a bolt assembly for fixing the plastic energy-dissipating strip (8) to the second plate (6).

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