A buckling-resistant stepped energy-dissipating friction damper

Abstract

The present invention discloses a buckling-resistant stepped energy-dissipating friction damper, which includes a first connecting head and a second connecting head. The first connecting head is connected with a fixed steel plate, the second connecting head is connected with an intermediate steel plate, and the second connecting head is movably connected with a movable steel plate. Friction plates are provided between the fixed steel plate and the intermediate steel plate and the movable steel plate; the fixed steel plate is provided with a first connecting hole, the friction plates are all provided with second connecting holes, the intermediate steel plate and the movable steel plate are both provided with first strip-shaped sliding holes, and a first bolt connection assembly for connecting the steel plates is further included; the second connecting head is provided with a third connecting hole, one end of the movable steel plate is provided with a second strip-shaped sliding hole, and the lengths of the second strip-shaped sliding holes on multiple movable steel plates increase step by step. A second bolt connection assembly for connecting the movable steel plate and the second connecting head is further included. The present invention has the effects of multi-function and stepped energy-dissipating shock absorption, and has good shock absorption effects under the actions of frequent earthquakes, fortification earthquakes, rare earthquakes, and even extremely rare earthquakes.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic disaster prevention for building structures, and particularly relates to a buckling-resistant staged energy-dissipating friction damper. Background Art

[0002] The traditional seismic concept of "not collapsing in major earthquakes" is evolving towards quickly restoring the normal living order of cities and residents after earthquakes. Buildings require a structure or component that can quickly resume its function after an earthquake. A recoverable function structure refers to a structure that can resume its service function without repair or with only minor repair after an earthquake. High-rise buildings have a large number of users. Once damaged by an earthquake, the economic and time costs of repairing and strengthening high-rise buildings after an earthquake are very high. Replaceable components are an effective way to achieve the recoverable function of high-rise building structures after an earthquake.

[0003] At present, dampers are used in building structure systems for energy dissipation and seismic reduction. Common energy-dissipating dampers mainly include viscous dampers, metallic dampers, viscoelastic dampers, and friction dampers, etc. Among them, friction dampers are widely used due to their advantages such as simple structure, low cost, stable performance, and no need for later maintenance. However, due to its own structural limitations, the general component size of the existing friction damper is small, the number of allowable preloading bolts is limited, the damping force is small, and the energy-dissipating ability is weak; and it can only start energy dissipation in the first order, and the energy-dissipating ability remains fixed under different seismic conditions; in addition, from the connection form with the building structure, it can only be connected in a wall type or by using additional ordinary steel components. It can be seen that the maximum damping force of the existing friction damper is relatively low, the energy-dissipating working conditions for shock absorption and energy dissipation are single, and the engineering application range is limited. Summary of the Invention

[0004] The purpose of the present invention is to provide a buckling-resistant staged energy-dissipating friction damper, which can realize that only the friction energy-dissipating function starts under a certain deformation displacement threshold, and under this threshold, the friction energy-dissipating ability will start in stages according to different structural deformations caused by different seismic conditions; when exceeding a certain deformation displacement threshold, the function of the buckling-resistant brace starts in stages. Thus, it can realize the staged start of the energy-dissipating ability under frequently-occurring earthquakes, fortification earthquakes, rare earthquakes, and even extremely rare earthquakes, and has good energy-dissipating and seismic reduction effects under different seismic conditions, improving the seismic performance of the main structure.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] A buckling-resistant stepped energy-dissipating friction damper, comprising a first connector and a second connector. The first connector is fixedly connected with at least one fixed steel plate. The second connector is fixedly connected with at least one intermediate steel plate. The second connector is movably connected with at least one movable steel plate. The number of the movable steel plates is the same as that of the fixed steel plates. The intermediate steel plates and the movable steel plates are alternately distributed with the fixed steel plates. Friction plates are arranged between the fixed steel plates and the intermediate steel plates and the movable steel plates respectively;

[0007] Each fixed steel plate is provided with a plurality of first connection holes distributed along its length direction. Each friction plate is provided with a plurality of second connection holes corresponding to the first connection holes one by one. The intermediate steel plate and each movable steel plate are provided with a plurality of first strip-shaped sliding holes arranged along their length directions and corresponding to the first connection holes one by one. The friction damper further comprises a plurality of first bolt connection assemblies corresponding to the first connection holes one by one. Each first bolt connection assembly passes through the first connection hole, the second connection hole and the first strip-shaped sliding hole to connect the fixed steel plate, the intermediate steel plate, the movable steel plate and the friction plate;

[0008] The second connector is provided with a plurality of third connection holes. One end of each movable steel plate close to the second connector is provided with a plurality of second strip-shaped sliding holes arranged along its length direction and corresponding to the third connection holes one by one. The lengths of the second strip-shaped sliding holes on the plurality of movable steel plates increase step by step. The friction damper further comprises a plurality of second bolt connection assemblies corresponding to the third connection holes one by one. Each second bolt connection assembly passes through the third connection hole and the second strip-shaped sliding hole to slidably connect the movable steel plate and the second connector.

[0009] By adopting the above technical solution, when a minor earthquake occurs, the shaking of the building structure drives the movement of the second connector, which in turn drives the movement of the intermediate steel plate. The intermediate steel plate rubs against the friction plate to dissipate energy, converting the vibration energy of the building into heat energy. However, the movement amplitude is less than the length of the second strip-shaped sliding hole of the movable steel plate a. When the movement amplitude is greater than the length of the second strip-shaped sliding hole of the movable steel plate a and less than the length of the second strip-shaped sliding hole of the movable steel plate b, the second connector drives the movable steel plate a to move through the second bolt connection assembly, causing the intermediate steel plate and the movable steel plate a to simultaneously rub against the friction plate to dissipate energy. When the movement amplitude is greater than the length of the second strip-shaped sliding hole of the movable steel plate b, the second connector continues to drive the movable steel plate b to move through the second bolt connection assembly, causing the intermediate steel plate, the movable steel plate a, and the movable steel plate b to simultaneously rub against the friction plate to dissipate energy, achieving the purpose of dissipating energy through friction during a larger earthquake. At this time, the deformation of the damper still does not exceed the deformation displacement threshold (i.e., the unilateral allowable value of the first strip-shaped sliding hole). When the earthquake action continues to increase and the deformation of the damper exceeds the deformation displacement threshold of the damper for dissipating energy through friction (i.e., the unilateral allowable value of the first strip-shaped sliding hole), the intermediate steel plates are restricted by the first bolt connection assembly and the deformation limit gap and cannot continue to slide relative to each other. However, the deformation continues to increase. At this time, the intermediate steel plates are gradually transformed into energy dissipation core materials, and the buckling-restrained brace function is activated. Since the allowable deformations at the ends of the intermediate steel plates are different, the staged activation can also be achieved.

[0010] A further setting of the present invention is: it further includes a damper sleeve. The fixed steel plate, the intermediate steel plate, the movable steel plate, and the friction plate are all arranged inside the damper sleeve. The first connector is fixedly connected relative to the damper sleeve, and the second connector is slidably connected relative to the damper sleeve. The damper sleeve is filled with a filler.

[0011] A further setting of the present invention is: an isolation layer for isolating the filler is arranged outside the fixed steel plate, the intermediate steel plate, the movable steel plate, and the friction plate. Both ends of each first bolt connection assembly are arranged inside the filler.

[0012] By adopting the above technical solution, it is convenient for the intermediate steel plate and the movable steel plate to move, and the filler can ensure that the first bolt connection assembly does not move with the intermediate steel plate and the movable steel plate, ensuring that the performance of the damper is more stable.

[0013] A further setting of the present invention is: the filler is concrete.

[0014] A further setting of the present invention is: an activity gap for the movement of the second connector is arranged at one end of the filler, and there is a deformation limit gap between the second connector and the intermediate steel plate and the movable steel plate.

[0015] A further setting of the present invention is: each first bolt connection assembly includes a hexagonal bolt, a nut, a spring steel, and a gasket.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] First, as the deformation of the building gradually increases under the action of an earthquake, the intermediate steel plate and the movable steel plate gradually start to adaptively slide, frictionally consume energy with the friction plates, and convert the vibration energy of the building into heat energy. After the deformation exceeds a certain limit, the product has the dual functions of friction energy consumption and buckling-restrained brace energy consumption, thereby achieving the purpose of adaptive staged shock absorption and energy consumption, and having good shock absorption effects under frequent earthquakes, fortification earthquakes, rare earthquakes, and even extremely rare earthquakes.

[0018] Second, both ends of the first bolt connection assembly are fixed in the filler, so that the first bolt connection assembly is fixed relative to the fixed steel plate and the friction plates, and will not move with the intermediate steel plate and the movable steel plate, ensuring that the performance of the damper is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a cross-sectional view of the present invention;

[0021] Figure 3 for showing the connection between the first connection head and the fixed steel plate;

[0022] Figure 4 for showing the connection between the second connection head and the intermediate steel plate;

[0023] Figure 5 for showing two movable steel plates;

[0024] Figure 6 is a schematic diagram of the overall structure of the friction plate.

[0025] In the figure: 1, first connection head; 2, second connection head; 21, third connection hole; 3, fixed steel plate; 31, first connection hole; 4, intermediate steel plate; 5, movable steel plate; 51, first strip-shaped sliding hole; 52, second strip-shaped sliding hole; 6, friction plate; 61, second connection hole; 7, first bolt connection assembly; 71, hexagon bolt; 72, nut; 73, spring steel; 74, gasket; 8, second bolt connection assembly; 9, damper sleeve; 91, filler; 92, movable gap; 93, deformation limit gap; 10, isolation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Embodiment, referring to Figures 1-6, a buckling-restrained stepped energy-dissipating friction damper, comprising a first connector 1 and a second connector 2. The first connector 1 is fixedly connected with at least one fixed steel plate 3. In this embodiment, there are two fixed steel plates 3. The second connector 2 is fixedly connected with an intermediate steel plate 4. The second connector 2 is movably connected with at least one movable steel plate 5. There are two movable steel plates 5, namely movable steel plate 5a and movable steel plate 5b. The intermediate steel plate 4 and the movable steel plates 5 are staggered with the fixed steel plate 3. A friction plate 6 is arranged between the fixed steel plate 3 and the intermediate steel plate 4 and the movable steel plates 5 respectively.

[0028] Each fixed steel plate 3 is provided with two rows of first connection holes 31 distributed along its length direction. Each friction plate 6 is provided with two rows of second connection holes 61 corresponding to the first connection holes 31 one by one. The intermediate steel plate 4 and each movable steel plate 5 are provided with two rows of first strip-shaped sliding holes 51 arranged along their length directions and corresponding to the first connection holes 31 one by one. It also includes a plurality of first bolt connection assemblies 7 corresponding to the first connection holes 31 one by one. Each first bolt connection assembly 7 includes a hexagonal bolt 71, a nut 72, a spring steel 73 and a gasket 74. Each first bolt connection assembly 7 passes through the first connection hole 31, the second connection hole 61 and the first strip-shaped sliding hole 51 to connect the fixed steel plate 3, the intermediate steel plate 4, the movable steel plate 5 and the friction plate 6, so that the fixed steel plate 3 and the friction plate 6 are relatively fixed, and the intermediate steel plate 4 and the movable steel plates 5 can slide relative to the fixed steel plate 3 and the friction plate 6. And the addition of the spring steel 73 and the gasket 74 in the first bolt connection assembly 7 can make the friction plate 6 be clamped tighter, enhance the friction coefficient, and also be less likely to loosen and fall off.

[0029] The second connector 2 is provided with six third connection holes 21. One end of each movable steel plate 5 close to the second connector 2 is provided with six second strip-shaped sliding holes 52 arranged along its length direction and corresponding to the third connection holes 21 one by one. The lengths of the second strip-shaped sliding holes 52 on the plurality of movable steel plates 5 increase step by step. The length of the second strip-shaped sliding hole 52 of the movable steel plate 5b is longer than that of the second strip-shaped sliding hole 52 of the movable steel plate 5a. It also includes six second bolt connection assemblies 8 corresponding to the third connection holes 21 one by one. Each second bolt connection assembly 8 passes through the third connection hole 21 and the second strip-shaped sliding hole 52 to slidably connect the movable steel plate 5 and the second connector 2, so as to realize that as the vibration amplitude gradually increases, the intermediate steel plate 4, the movable steel plate 5a and the movable steel plate 5b gradually start to move to dissipate energy through friction.

[0030] It further includes a damper sleeve 9. The fixed steel plate 3, the intermediate steel plate 4, the movable steel plate 5 and the friction plate 6 are all arranged inside the damper sleeve 9. The first connector 1 is fixedly connected relative to the damper sleeve 9, and the second connector 2 is slidably connected relative to the damper sleeve 9. The damper sleeve 9 is filled with a filler 91, and the filler 91 is concrete. One end of the filler 91 is provided with a movement gap 92 for the second connector 2 to move. There is a deformation limit gap 93 between the second connector 2, the intermediate steel plate 4 and the movable steel plate 5. A layer of isolation layer 10 for isolating the filler 91 is arranged outside the fixed steel plate 3, the intermediate steel plate 4, the movable steel plate 5 and the friction plate 6. The isolation layer 10 prevents the filler 91 from entering the first strip-shaped sliding hole 51, facilitating the movement of the intermediate steel plate 4 and the movable steel plate 5. Both ends of each first bolt connection assembly 7 are arranged inside the filler 91, making the first connector 1, the fixed steel plate 3 and the friction plate 6 all fixed relative to the damper sleeve 9, and the filler 91 can ensure that the first bolt connection assembly 7 does not move with the intermediate steel plate 4 and the movable steel plate 5, ensuring more stable damper performance.

[0031] Working principle: When a minor earthquake occurs, the shaking of the building structure drives the movement of the second connector 2, which drives the movement of the intermediate steel plate 4, and the friction with the friction plate 6 consumes energy, converting the vibration energy of the building into heat energy, but the movement amplitude is less than the length of the second strip-shaped sliding hole 52 of the movable steel plate 5a; when the movement amplitude is greater than the length of the second strip-shaped sliding hole 52 of the movable steel plate 5a and less than the length of the second strip-shaped sliding hole 52 of the movable steel plate 5b, the second connector 2 drives the movable steel plate 5a to move through the second bolt connection assembly 8, so that the intermediate steel plate 4 and the movable steel plate 5a simultaneously consume energy by friction with the friction plate 6; when the movement amplitude is greater than the length of the second strip-shaped sliding hole 52 of the movable steel plate 5b, the second connector 2 continues to drive the movable steel plate 5b to move through the second bolt connection assembly 8, so that the intermediate steel plate 4, the movable steel plate 5a and the movable steel plate 5b simultaneously consume energy by friction with the friction plate 6, achieving the purpose of consuming energy by friction during a large earthquake. At this time, the deformation of the damper still does not exceed the deformation displacement threshold (i.e., the unilateral allowable value of the first strip-shaped sliding hole 51). When the earthquake action continues to increase and the deformation of the damper exceeds the damper friction energy consumption deformation displacement threshold (i.e., the unilateral allowable value of the first strip-shaped sliding hole 51), the intermediate steel plates cannot continue to slide relative to each other due to the limitation of the first bolt connection assembly 7 and the deformation limit gap 93, but the deformation continues to increase. At this time, the intermediate steel plates are gradually transformed into energy-consuming core materials, and the buckling-restrained brace function is activated. Since the allowable deformations at the ends of the intermediate steel plates are different, it is also possible to achieve staged activation.

[0032] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A buckling-resistant stepped energy-dissipating friction damper, comprising a first connector (1) and a second connector (2). Characterized in that: At least one fixed steel plate (3) is fixedly connected to the first connector (1), at least one intermediate steel plate (4) is fixedly connected to the second connector (2), at least one movable steel plate (5) is movably connected to the second connector (2), the number of the movable steel plates (5) is the same as that of the fixed steel plates (3), the intermediate steel plates (4) and the movable steel plates (5) are staggered with the fixed steel plates (3), and friction plates (6) are arranged between the fixed steel plates (3) and the intermediate steel plates (4) and the movable steel plates (5); Each fixed steel plate (3) is provided with a plurality of first connection holes (31) distributed along its length direction, each friction plate (6) is provided with a plurality of second connection holes (61) corresponding to the first connection holes (31) one by one, the intermediate steel plates (4) and each movable steel plate (5) are provided with a plurality of first strip-shaped sliding holes (51) arranged along their length directions and corresponding to the first connection holes (31) one by one, and further comprising a plurality of first bolt connection assemblies (7) corresponding to the first connection holes (31) one by one. Each first bolt connection assembly (7) passes through the first connection hole (31), the second connection hole (61) and the first strip-shaped sliding hole (51) to connect the fixed steel plate (3), the intermediate steel plate (4), the movable steel plate (5) and the friction plate (6); The second connector (2) is provided with a plurality of third connection holes (21). One end of each movable steel plate (5) close to the second connector (2) is provided with a plurality of second strip-shaped sliding holes (52) arranged along its length direction and corresponding to the third connection holes (21) one by one. The lengths of the second strip-shaped sliding holes (52) on the plurality of movable steel plates (5) increase step by step. Further comprising a plurality of second bolt connection assemblies (8) corresponding to the third connection holes (21) one by one. Each second bolt connection assembly (8) passes through the third connection hole (21) and the second strip-shaped sliding hole (52) to slidably connect the movable steel plate (5) and the second connector (2); Further comprising a damper sleeve (9). The fixed steel plate (3), the intermediate steel plate (4), the movable steel plate (5) and the friction plate (6) are all arranged in the damper sleeve (9). The first connector (1) is fixedly connected relative to the damper sleeve (9), the second connector (2) is slidably connected relative to the damper sleeve (9), and the damper sleeve (9) is filled with a filler (91); An isolation layer (10) for isolating the filler (91) is arranged outside the fixed steel plate (3), the intermediate steel plate (4), the movable steel plate (5) and the friction plate (6). Both ends of each first bolt connection assembly (7) are arranged in the filler (91); One end of the filler (91) is provided with a moving gap (92) for the second connector (2) to move. There is a deformation limit gap (93) between the second connector (2), the intermediate steel plate (4) and the movable steel plate (5). The movable steel plate (5) consists of two parts, namely movable steel plate a and movable steel plate b. As the vibration amplitude gradually increases, the intermediate steel plate (4), movable steel plate a and movable steel plate b gradually start to move to dissipate energy through friction. When a small earthquake occurs, the shaking of the building structure drives the second connector (2) to move, which in turn drives the intermediate steel plate (4) to move and dissipate energy through friction with the friction plate (6), converting the vibration energy of the building into heat energy. However, the movement amplitude is less than the length of the second elongated slide hole (52) of the movable steel plate a. When the movement amplitude is greater than the length of the second elongated slide hole (52) of the movable steel plate a and less than the length of the second elongated slide hole (52) of the movable steel plate b, the second connector (2) drives the movable steel plate a to move through the second bolt connection assembly (8), causing the intermediate steel plate (4) and the movable steel plate a to simultaneously dissipate energy through friction with the friction plate (6). When the movement amplitude is greater than the length of the second elongated slide hole (52) of the movable steel plate b, the second connector (2) continues to drive the movable steel plate b to move through the second bolt connection assembly (8), causing the intermediate steel plate (4), movable steel plate a and movable steel plate b to simultaneously dissipate energy through friction with the friction plate (6), achieving the purpose of dissipating energy through friction during a larger earthquake. At this time, the deformation of the damper still does not exceed the unilateral allowable value of the first elongated slide hole (51). When the earthquake action continues to increase and the deformation of the damper exceeds the unilateral allowable value of the first elongated slide hole (51), the intermediate steel plates cannot continue to slide relative to each other due to the limitation of the first bolt connection assembly (7) and the deformation limit gap (93), but the deformation continues to increase. At this time, the intermediate steel plates are gradually transformed into energy dissipation core materials, and the buckling-restrained brace function is activated. Since the allowable deformations of the ends of the intermediate steel plates are different, the staged activation is achieved.

2. A buckling-restrained staged energy-dissipating friction damper according to claim 1, characterized in that: The filler (91) is concrete.

3. A buckling-restrained staged energy-dissipating friction damper according to claim 1, characterized in that: Each first bolt connection assembly (7) includes a hexagon bolt (71), a nut (72), a spring steel (73) and a gasket (74).

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