Recoverable multistage energy consumption composite friction damper

Abstract

The invention relates to a recoverable multistage energy dissipation composite friction damper, and belongs to the civil engineering industry. The invention discloses a recoverable multistage energy consumption composite friction damper. The friction damper comprises a connecting plate, a bolt, a friction plate, a sliding plate, a spring, an outer friction plate and a nut, the friction plates are located in the two slotted holes in the outer friction plate, the lengths of the left slotted hole and the right slotted hole are different, the strokes of the friction plates are different, and multi-stage energy consumption can be achieved through combination of the two slotted holes. The outer friction plate and the sawtooth face of the sliding plate are meshed and rubbed with each other, and the friction plate and the spring are arranged so that the friction force changing and self-resetting functions can be achieved. Aiming at the current situation that an existing friction damper is generally single in energy dissipation mechanism and cannot recover to the original position after an earthquake, the recoverable multi-stage energy dissipation composite friction damper provided by the invention has the capability of meeting the multi-stage energy dissipation requirements and self-resetting under different earthquake actions; and the requirements of different earthquake fortification in engineering can be well met, the performance is stable, and the structural safety is ensured.

Description

Technical Field

[0001] The present invention relates to a recoverable multi - level energy - dissipating composite friction damper, belonging to the civil engineering industry Background Art

[0002] Traditional seismic structures mainly utilize the plastic deformation of building components to consume the input energy. During an earthquake, irrecoverable residual deformation will occur, resulting in the structure being unable to continue normal use after the earthquake. As an energy - dissipating and shock - absorbing device, the friction damper is cheap, less affected by the external environment, has stable performance, can reduce the harm caused by earthquakes, reduce structural damage, and ensure the safety of the structure

[0003] The existing friction dampers generally have the problems of a single energy - dissipating mechanism and being unable to return to the original position after an earthquake, and cannot well meet the increasingly diverse needs in engineering. Therefore, researching a friction damper with both multi - level energy - dissipating ability and self - reset ability is an urgent problem to be solved and has broad development and application prospects Summary of the Invention

[0004] The present invention provides a recoverable multi - level energy - dissipating composite friction damper for the above - mentioned problems

[0005] The present invention adopts the following technical solutions

[0006] The recoverable multi - level energy - dissipating composite friction damper of the present invention includes a connecting plate, bolts, friction plates, sliding plates, springs, outer friction plates, and nuts; the friction plates are located in two slot holes on the outer friction plate. The slot hole on the right is shorter, the stroke of the friction plate is smaller, and the hysteresis loop is also smaller. The slot hole on the left is longer, the stroke is longer, and the hysteresis loop is larger. After the two are combined, a stepped - change hysteresis loop will be generated, thereby realizing multi - level energy dissipation. The outer friction plate and the friction plates are in frictional engagement with the serrated surfaces of the sliding plates. The setting of the friction plates and the springs can achieve the function of changing the frictional force and self - reset

[0007] For the recoverable multi - level energy - dissipating composite friction damper of the present invention, the connecting plate is connected to the upper and lower outer friction plates through bolts

[0008] For the recoverable multi - level energy - dissipating composite friction damper of the present invention, the friction plates are located at the middle positions of two slot holes on the outer friction plate, are provided with two bolt holes, and one side is a serrated surface, which is in frictional engagement with the sliding plate. When the friction starts to slip at the beginning, the friction plates on both the left and right sides have not reached the edges of the slot holes, and the frictional force is f 0 , when the friction plate in the right - hand slot hole of the outer friction plate reaches the edge of the slot hole and stops moving while the left - hand friction plate is still moving, the frictional force is f 0 +f 1, when the friction plates on both the left and right sides reach the edges of the slot holes and stop moving, the frictional force is f 0 +f 1 +f 2 , the setting of the friction plates changes the frictional force.

[0009] A recoverable multi-stage energy-dissipating composite friction damper according to the present invention, wherein the sliding plate is provided with three slot holes, and both the upper and lower surfaces are serrated surfaces, which engage and friction with the outer friction plate and the friction plate.

[0010] A recoverable multi-stage energy-dissipating composite friction damper according to the present invention, wherein the spring is located between the bolt and the outer friction plate. When the outer friction plate and the sliding plate frictionally slide, due to the serrated contact surface, the distance between the outer friction plate and the sliding plate will become larger, compressing the spring and providing a greater normal pressure, thereby increasing the frictional force.

[0011] A recoverable multi-stage energy-dissipating composite friction damper according to the present invention, wherein the outer friction plate is a rectangular plate, provided with bolt holes and slot holes, the contact surface with the sliding plate is serrated, and one end is connected to the connecting plate.

[0012] An installation method of a recoverable multi-stage energy-dissipating composite friction damper according to the present invention, the installation method is as follows:

[0013] 1), First, determine the positions of the two plates according to the positions of the bolt holes on the outer friction plate, the slot holes on the sliding plate, and the mutual engagement of the serrated surfaces of the two plates. Then place a spring between the bolt and the outer friction plate, and tighten the bolt for connection;

[0014] 2), Place the friction plate at the center position of the two slot holes of the outer friction plate, and engage it with the serrated surface of the sliding plate. Then place a spring between the bolt and the outer friction plate, and tighten the bolt for connection;

[0015] 3), Align the bolt holes of the connecting plate with the bolt holes of the outer friction plate, and use bolts for connection to complete the installation.

[0016] A working method of a recoverable multi-stage energy-dissipating composite friction damper according to the present invention, the working method is as follows:

[0017] 1), At the beginning of frictional starting, the friction plates in the left and right slot holes of the outer friction plate have not reached the edges of the slot holes, and the two friction plates are still in the state of moving together with the sliding plate. At this time, the frictional force is only generated by the frictional sliding between the sliding plate and the outer friction plate, which is f 0 , which is the first-order energy-dissipating state;

[0018] 2), As the sliding plate slides, since the length of the slot on the right side of the outer friction plate is shorter than that on the left side, the friction plate in the right slot reaches the edge of the slot first and stops moving, while the friction plate in the left slot of the outer friction plate is still moving with the sliding plate. At this time, the frictional force is generated by the frictional sliding between the sliding plate, the outer friction plate, and the friction plate in the right slot of the outer friction plate, and is f 0 +f 1 , which is a second-order energy dissipation state;

[0019] 3), As the sliding plate continues to slide, the friction plate in the left slot of the outer friction plate also reaches the edge of the slot and stops moving. The friction plates on both the left and right sides work simultaneously. At this time, the frictional force is generated by the frictional sliding between the sliding plate, the outer friction plate, and the friction plates in the left and right slots of the outer friction plate, and is f 0 +f 1 +f 2 , which is a third-order energy dissipation state;

[0020] 4), When the distance between the sliding plate and the outer friction plate increases due to the frictional dislocation of the serrated surface, the spring will also be compressed. The spring will give the outer friction plate a downward force, increasing the normal pressure, thereby increasing the frictional force and enabling the friction damper to automatically reset.

[0021] Beneficial Effects

[0022] Aiming at the current situation that existing friction dampers generally have a single energy dissipation mechanism and cannot return to the original position after an earthquake, the recoverable multi-stage energy dissipation composite friction damper provided by the present invention has the ability to meet the multi-stage energy dissipation requirements under different earthquake actions and self-reset, can well meet the different seismic fortification requirements in engineering, has stable performance, can reduce structural damage, and ensure structural safety. Brief Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of the present invention;

[0024] Figure 2 is the side view of the device of the present invention

[0025] Figure 3 is the exploded view of the present invention;

[0026] Figure 4 is the structural sectional view of the present invention;

[0027] Figure 5 is the detailed drawing of the spring of the present invention;

[0028] In the figure: 1 - connecting plate; 2 - bolt; 3 - friction plate; 4 - sliding plate; 5 - spring; 6 - outer friction plate; 7 - nut. Detailed Embodiments

[0029] To make the objectives and technical solutions of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0030] As Figure 1 , Figure 2 shown: A recoverable multi-stage energy-dissipating composite friction damper includes a connecting plate 1, bolts 2, friction plates 3, a sliding plate 4, a spring 5, an outer friction plate 6, and nuts 7; the friction plates 3 are located in two slot holes on the outer friction plate 6. The slot hole on the right is shorter, the stroke of the friction plate 3 is smaller, and the hysteresis loop is also smaller. The slot hole on the left is longer, the stroke is longer, and the hysteresis loop is larger. After the two are combined, a stepped hysteresis loop will be generated, thereby realizing multi-stage energy dissipation. The outer friction plate 6 and the friction plates 3 are in frictional engagement with the serrated surfaces of the sliding plate 4. The arrangement of the friction plates 3 and the spring 5 can achieve the functions of changing the frictional force and self-resetting.

[0031] The connecting plate 1 is connected to the outer friction plates 6 on the upper and lower sides through bolts 2.

[0032] The friction plates 3 are located at the central positions of the two slot holes on the outer friction plate 6, are provided with two bolt 2 holes, and one side is a serrated surface for frictional engagement with the sliding plate 4. At the beginning of frictional slip, the friction plates 3 on both the left and right sides have not reached the edges of the slot holes, and the frictional force is f 0 , when the friction plate 3 in the right slot hole of the outer friction plate 6 reaches the edge of the slot hole and stops moving while the friction plate 3 on the left is still moving, the frictional force is f 0 +f 1 , when the friction plates 3 on both the left and right sides reach the edges of the slot holes and stop moving, the frictional force is f 0 +f 1 +f 2 . The arrangement of the friction plates 3 changes the frictional force.

[0033] The sliding plate 4 is provided with three slot holes, and both the upper and lower surfaces are serrated surfaces for frictional engagement with the outer friction plate 6 and the friction plates 3.

[0034] The outer friction plate 6 is a rectangular plate, is provided with bolt 2 holes and slot holes, the contact surface with the sliding plate 4 is serrated, and one end is connected to the connecting plate 1.

[0035] As Figure 4As shown: The spring 5 is located between the bolt 2 and the outer friction plate 6. When the outer friction plate 6 and the sliding plate 4 undergo frictional sliding, due to their serrated contact surface, the distance between the outer friction plate 6 and the sliding plate 4 will increase, compressing the spring 5 and providing a greater normal force, thereby increasing the frictional force.

[0036] A recoverable multi-stage energy-dissipating composite friction damper, and the installation method is as follows:

[0037] 1), First, determine the positions of the two plates according to the positions of the bolt 2 holes on the outer friction plate 6, the slot holes on the sliding plate 4, and the interlocking of the serrated surfaces of the two plates. Then, place the spring 5 between the bolt 2 and the outer friction plate 6, and tighten the bolt 2 for connection.

[0038] 2), Place the friction plate 3 at the center position of the two slot holes of the outer friction plate 6, and interlock it with the serrated surface of the sliding plate 4. Then, place the spring 5 between the bolt 2 and the outer friction plate 6, and tighten the bolt 2 for connection.

[0039] 3), Align the bolt 2 holes of the connecting plate 1 with the bolt 2 holes of the outer friction plate 6, and use the bolt 2 for connection to complete the installation.

[0040] A recoverable multi-stage energy-dissipating composite friction damper, and the working method is as follows:

[0041] 1), At the beginning of frictional slip, the friction plates 3 in the left and right slot holes of the outer friction plate 6 have not reached the edges of the slot holes, and the two friction plates 3 are still in the state of moving together with the sliding plate 4. At this time, the frictional force is only generated by the frictional sliding between the sliding plate 4 and the outer friction plate 6, which is f 0 , and it is the first-order energy-dissipating state;

[0042] 2), As the sliding plate 4 slides, since the length of the right slot hole of the outer friction plate 6 is shorter than that of the left slot hole, the friction plate 3 in the right slot hole of the outer friction plate 6 reaches the edge of the slot hole first and stops moving, while the friction plate 3 in the left slot hole of the outer friction plate 6 is still moving with the sliding plate 4. At this time, the frictional force is generated by the frictional sliding between the sliding plate 4, the outer friction plate 6, and the friction plate 3 in the right slot hole of the outer friction plate 6, which is f 0 +f 1 , and it is the second-order energy-dissipating state;

[0043] 3), As the sliding plate 4 continues to slide, the friction plate 3 in the left slot hole of the outer friction plate 6 also reaches the edge of the slot hole and stops moving, and the friction plates 3 on both the left and right sides work simultaneously. At this time, the frictional force is generated by the frictional sliding between the sliding plate 4, the outer friction plate 6, and the friction plates 3 in the left and right slot holes of the outer friction plate 6, which is f 0 +f 1 +f 2 , and it is the third-order energy-dissipating state;

[0044] 4) When the distance between the sliding plate 4 and the outer friction plate 6 increases due to the frictional displacement of the serrated surfaces, the spring 5 will also be compressed. The spring 5 will exert a downward force on the outer friction plate 6, increasing the normal pressure, thereby increasing the frictional force and enabling the friction damper to automatically reset.

[0045] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A recoverable multi - level energy - dissipating composite friction damper, Characterized in that: The friction damper includes a connecting plate (1), bolts (2), friction plates (3), a sliding plate (4), springs (5), outer friction plates (6), and nuts (7); The friction plates (3) are located in two slot holes on the outer friction plate (6). The slot hole on the right is shorter, the stroke of the friction plate (3) is smaller, and the hysteresis loop is also smaller. The slot hole on the left is longer, the stroke is longer, and the hysteresis loop is larger. After the combination of the two, a stepped - change hysteresis loop will be generated, thus realizing multi - level energy dissipation. The outer friction plate (6) and the friction plates (3) are in frictional engagement with the serrated surfaces of the sliding plate (4). The arrangement of the friction plates (3) and the springs (5) can achieve the functions of changing the frictional force and self - resetting.

2. A recoverable multi - level energy - dissipating composite friction damper according to claim 1, Characterized in that: The connecting plate (1) is connected to the upper and lower outer friction plates (6) through bolts (2).

3. A recoverable multi - level energy - dissipating composite friction damper according to claim 1, Characterized in that: The friction plate (3) is located at the center position of two slots in the outer friction plate (6), has two bolt (2) holes, and one side is a serrated surface for engaging and friction with the sliding plate (4). At the beginning of frictional starting, the friction plates (3) on both the left and right sides have not reached the edge of the slots, and the frictional force is f 0 , when the friction plate (3) in the right slot of the outer friction plate (6) reaches the edge of the slot and stops moving while the friction plate (3) on the left is still moving, the frictional force is f 0 +f 1 , when the friction plates (3) on both the left and right sides reach the edge of the slots and stop moving, the frictional force is f 0 +f 1 +f 2 , the setting of the friction plate (3) changes the frictional force.

4. A recoverable multi - level energy - dissipating composite friction damper according to claim 1, Characterized in that: The sliding plate (4) is provided with three slot holes, and both the upper and lower surfaces are serrated surfaces, which are in frictional engagement with the outer friction plate (6) and the friction plates (3).

5. A recoverable multi - level energy - dissipating composite friction damper according to claim 1, Characterized in that: The spring (5) is located between the bolt (2) and the outer friction plate (6). When the outer friction plate (6) and the sliding plate (4) perform frictional sliding, due to their serrated contact surfaces, the distance between the outer friction plate (6) and the sliding plate (4) will become larger, compressing the spring (5) and providing a greater normal pressure, thereby increasing the frictional force.

6. A recoverable multi - level energy - dissipating composite friction damper according to claim 1, Characterized in that: The outer friction plate (6) is a rectangular plate, with bolt (2) holes and slot holes opened on the plate. The contact surface with the sliding plate (4) is serrated, and one end is connected to the connecting plate (1).

7. An installation method of a recoverable multi - level energy - dissipating composite friction damper according to any one of claims 1 to 6, Characterized in that: 1), First, determine the positions of the two plates according to the positions of the bolt (2) holes on the outer friction plate (6), the slot holes on the sliding plate (4), and the frictional engagement of the serrated surfaces of the two plates. Then place the spring (5) between the bolt (2) and the outer friction plate (6), and tighten the bolt (2) for connection. 2), Place the friction plates (3) at the center positions of the two slot holes of the outer friction plate (6), and engage them with the serrated surfaces of the sliding plate (4). Then place the spring (5) between the bolt (2) and the outer friction plate (6), and tighten the bolt (2) for connection. 3), Align the bolt (2) holes of the connecting plate (1) with the bolt (2) holes of the outer friction plate (6), and use bolts (2) for connection to complete the installation.

8. An operating mode of a recoverable multi - level energy - dissipating composite friction damper according to any one of claims 1 to 6, Characterized in that: The working method is as follows: 1) At the beginning of frictional starting slip, the friction plates (3) in the left and right slots of the outer friction plate (6) have not reached the slot edges, and the two friction plates (3) are still in the state of moving together with the sliding plate (4). At this time, the frictional force is only generated by the frictional sliding between the sliding plate (4) and the outer friction plate (6), which is f 0 , which is the first-order energy dissipation state; 2) As the sliding plate (4) slides, since the length of the slot on the right side of the outer friction plate (6) is shorter than that on the left side, the friction plate (3) in the slot on the right side reaches the edge of the slot first and stops moving, while the friction plate (3) in the slot on the left side is still moving with the sliding plate (4). At this time, the frictional force is generated by the frictional sliding between the sliding plate (4) and the outer friction plate (6) and the friction plate (3) in the slot on the right side of the outer friction plate (6), which is f 0 +f 1 , which is the second-order energy dissipation state; 3) As the sliding plate (4) continues to slide, the friction plate (3) within the left slot of the outer friction plate (6) also reaches the edge of the slot and stops moving. The friction plates (3) on both the left and right sides work simultaneously. At this time, the frictional force is generated by the frictional sliding between the sliding plate (4) and the outer friction plate (6), as well as between the outer friction plate (6) and the friction plates (3) within the left and right slots on the outer friction plate (6), and is f. 0 +f 1 +f 2 , which is the third - order energy - dissipation state; 4) When the distance between the sliding plate (4) and the outer friction plate (6) increases due to the frictional displacement of the serrated surface, the spring (5) will also be compressed. The spring (5) will give the outer friction plate (6) a downward force, increasing the normal pressure, thereby increasing the frictional force and enabling the friction damper to automatically reset at the same time.

Images