Reinforced concrete frame structure with variable friction-mild steel damper

Abstract

The utility model relates to the technical field of energy dissipation and vibration reduction of civil engineering, and discloses a reinforced concrete frame structure with a variable friction-mild steel damper, which is characterized in that the damper is arranged at the vertical angle of a frame beam and a frame column, one end of the damper is fixed on the frame beam, and the other end of the damper is fixed on the frame column; the friction plate assembly and the energy consumption soft steel assembly are arranged in the damper, the variable stiffness and variable friction characteristics of the damper are utilized, larger constraining force can be provided, and the occupied space is relatively small; the resistance of a catenary mechanism can be improved, the probability of occurrence of progressive collapse is reduced, and the effects of less energy consumption in small earthquakes and more energy consumption in large earthquakes can be achieved under different earthquake magnitudes; the energy dissipation soft steel assembly is arranged in the damper, the energy dissipation capacity is improved, ductility is good, and large deformation and staged energy dissipation capacity can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy dissipation and vibration reduction in civil engineering, in particular to a reinforced concrete frame structure with a variable friction-soft steel damper. Background Art

[0002] Existing codes and studies usually only consider disaster prevention in one aspect, earthquake or progressive collapse, and there are few studies on the comprehensive defense of RC frame structures against earthquakes and progressive collapse. The seismic reinforcement of RC frame structures mainly targets the horizontal forces of earthquakes. Columns, as the main lateral force-resisting components, are designed to produce a "strong column and weak beam" type yield mechanism, so that the structure has good energy dissipation capacity while ensuring its bearing capacity. However, the reinforcement against progressive collapse mainly targets the local vertical load action, and beams are the main vertical force-resisting components. In the progressive collapse design, the strength of the beams will be strengthened, which may cause the "strong beam and weak column" phenomenon, which is not conducive to the seismic performance of the structure. Therefore, there is a contradiction between traditional seismic reinforcement and progressive collapse reinforcement design, and it is necessary to explore new earthquake-progressive collapse comprehensive defense technologies and design methods.

[0003] Compared with adding supports, the method of adding dampers at the nodes of beams and columns is widely used in the design concept of "strong nodes and weak components" due to its excellent performance, low space occupancy rate and low cost. It is intended to protect the nodes by transferring the plastic hinges at the ends of beams. However, due to the rigid protection of the nodes, the energy dissipation and shock absorption performance of the damper has not been effectively utilized in different stress stages of the structure, and the effect of improving the seismic toughness of the overall structure is not significant; specifically, the amplitude of the ground motion is small during small earthquakes, and the friction damper may not be fully activated or the energy dissipation mechanism is not fully started, resulting in less energy consumption; in large earthquakes, as the amplitude of the ground motion increases, although the friction damper can play a greater role in energy dissipation, it may be due to the excessive strength of the node or the relatively weak components, causing the components to be damaged before the damper, so that the energy dissipation capacity of the damper during large earthquakes cannot be fully utilized. At the same time, the design of some dampers is too complex and delicate, with high processing requirements, which increases the construction cost and brings inconvenience to the construction, or uses some uncommon materials, which is not conducive to promotion in actual engineering. Utility Model Content

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the utility model is to provide a reinforced concrete frame structure with a variable friction-soft steel damper to solve the technical problems in the prior art that the frame structure cannot provide tensile force in the large deformation stage and the catenary mechanism has low resistance.

[0005] The utility model is realized by the following technical solutions:

[0006] A reinforced concrete frame structure with a variable friction-mild steel damper comprises a reinforced concrete frame body;

[0007] The reinforced concrete frame body comprises a plurality of frame beams and frame columns, and the plurality of frame beams and frame columns are respectively and vertically fixedly connected;

[0008] A damper is provided at the vertical angle between the frame beam and the frame column, one end of the damper is fixed on the frame beam, and the other end is fixed on the frame column; a friction plate assembly and an energy-absorbing soft steel assembly are provided inside the damper.

[0009] Preferably, the friction plate assembly includes two groups of outer friction plates and two groups of inner friction plates; the energy-absorbing soft steel assembly includes energy-absorbing soft steel and slotted energy-absorbing soft steel;

[0010] The two groups of inner friction plates are arranged between the two groups of outer friction plates and are connected through bolts. The energy-absorbing soft steel and the slotted energy-absorbing soft steel are arranged between the two groups of inner friction plates and are fixedly connected through pins.

[0011] Furthermore, the two groups of outer friction plates, the two groups of inner friction plates, the energy-absorbing soft steel and the slotted energy-absorbing soft steel are in a fan-shaped structure.

[0012] Furthermore, the two groups of outer friction plates are provided with a first bolt hole, and the two groups of inner friction plates are provided with a first sliding groove at a position corresponding to the first bolt hole; the energy-absorbing soft steel is provided with a second bolt hole at a position corresponding to the first bolt hole, and the slotted energy-absorbing soft steel is provided with a second sliding groove at a position corresponding to the first bolt hole; the bolts drive the two groups of outer friction plates and the two groups of inner friction plates to rotate in the first bolt hole, the second bolt hole and the second sliding groove, and drive the energy-absorbing soft steel and the slotted energy-absorbing soft steel to slide in the first sliding groove along the two groups of inner friction plates.

[0013] Furthermore, the structure of the first sliding groove is an arc-shaped structure, and corresponds to the shapes of the two groups of outer friction plates and the two groups of inner friction plates, the energy-absorbing soft steel and the slotted energy-absorbing soft steel.

[0014] Furthermore, a first ramp is provided on one side of the two sets of outer friction plates close to the two sets of inner friction plates; a second ramp is provided on one side of the two sets of inner friction plates close to the two sets of outer friction plates; the first ramp and the second ramp are mutually embedded.

[0015] Furthermore, a connecting plate is provided between the two groups of outer friction plates; a first pin shaft hole is provided on the plate surface of the two groups of outer friction plates correspondingly, and a third pin shaft hole is provided on the plate surface of the connecting plate corresponding to the first pin shaft hole; the two groups of outer friction plates and the connecting plate are fixedly connected by a pin shaft passing through the first pin shaft hole and the third pin shaft hole.

[0016] Furthermore, the two groups of inner friction plates are also provided with second pin holes; the energy-absorbing soft steel and the slotted energy-absorbing soft steel are both provided with fourth pin holes at positions corresponding to the second pin holes; the two groups of inner friction plates and the energy-absorbing soft steel and the slotted energy-absorbing soft steel are fixedly connected by pins passing through the second pin holes and the fourth pin holes.

[0017] Furthermore, the bolt is provided with butterfly springs on the two sets of outer friction plates.

[0018] Furthermore, the frame beam is connected to one end of the damper through a steel plate by bolts or welding; and the frame column is connected to the other end of the damper through a steel plate by bolts or welding.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The utility model provides a reinforced concrete frame structure with a variable friction-soft steel damper. The damper is provided at the vertical angle between the frame beam and the frame column, one end of the damper is fixed to the frame beam, and the other end is fixed to the frame column; a friction plate assembly and an energy-absorbing soft steel assembly are provided in the damper, and the variable stiffness and variable friction characteristics of the damper can provide a greater restraining force and occupy relatively less space; the resistance of the catenary mechanism can be improved, the probability of continuous collapse can be reduced, and the effect of less energy consumption in small earthquakes and more energy consumption in large earthquakes can be achieved under different earthquake magnitudes; the energy-absorbing soft steel assembly is provided in the damper, so the energy-absorbing capacity is improved, and good ductility can be achieved, and large deformation and staged energy-absorbing capacity can be achieved.

[0021] Furthermore, the friction plate assembly includes two groups of outer friction plates and two groups of inner friction plates; the two groups of inner friction plates are arranged between the two groups of outer friction plates and are connected through bolts, and the energy-absorbing soft steel and the slotted energy-absorbing soft steel are arranged between the two groups of inner friction plates and are fixedly connected through pins, thereby improving the stability of the assembly of the two groups of outer friction plates and the two groups of inner friction plates and the energy-absorbing soft steel and the slotted energy-absorbing soft steel.

[0022] Furthermore, the structure of two sets of outer friction plates and two sets of inner friction plates, as well as energy-absorbing mild steel and slotted energy-absorbing mild steel is fan-shaped, which has a beautiful appearance and can reduce the space occupancy rate and reduce the impact on the use function of the building structure; the deformation at the node is related to the angle, and it is easier to calculate and design when it is set as a fan. The fan-shaped damper dissipates energy by rotating, which can have a larger angle and more efficient energy dissipation; compared with the linear damper, to achieve the same energy dissipation capacity, it is usually necessary to set a hinge support, which increases the complexity of installation. The fan-shaped damper can directly use a fixed support, which simplifies the installation process, reduces the construction process, and saves cost.

[0023] Furthermore, a first ramp is provided on one side of the two groups of outer friction plates close to the two groups of inner friction plates; a second ramp is provided on one side of the two groups of inner friction plates close to the two groups of outer friction plates; the first ramp and the second ramp are embedded in each other, thereby increasing the friction between the two groups of outer friction plates and the two groups of inner friction plates, and effectively achieving the effect of variable friction.

[0024] Furthermore, the bolts are provided with butterfly springs on the two sets of outer friction plates. The butterfly springs used have excellent variable stiffness characteristics, strong buffering and shock absorption capabilities, as well as high load-bearing capacity and small space occupancy. High-strength bolts have high strength, high tightening force and good fatigue resistance. Energy-dissipating soft steel components have good ductility and energy dissipation capacity. The combination of these materials has the advantages of simple construction, convenient installation, low cost and easy acquisition. By rationally utilizing these materials, the efficient function of the damper in structural engineering can be realized, and the quality and efficiency of the project can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a first schematic diagram of a reinforced concrete frame structure with a variable friction-mild steel damper in the utility model;

[0026] Figure 2 It is a second schematic diagram of a reinforced concrete frame structure with a variable friction-mild steel damper in the utility model;

[0027] Figure 3 The third schematic diagram of the reinforced concrete frame structure with variable friction-mild steel damper in the utility model

[0028] Figure 4 This is a schematic diagram of the structure of the damper in the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the foreign and domestic friction plates of the utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the inner friction plate in the utility model;

[0031] Figure 7 This is a schematic diagram of the connecting plate structure in the utility model;

[0032] Figure 8 This is a schematic diagram of the energy-consuming mild steel structure of the utility model;

[0033] Fig. 9 This is a schematic diagram of the slotted energy-dissipating mild steel structure in the utility model;

[0034] In the figure: 1-frame beam; 2-frame column; 3-damper; 4-external friction plate; 5-inner friction plate; 6-connecting plate; 7-bolt; 8-butterfly spring; 9-pin; 10-energy-absorbing soft steel; 11-slotted energy-absorbing soft steel; 12-first bolt hole; 13-first pin hole; 14-first ramp; 15-first sliding groove; 16-second pin hole; 17-third pin hole; 18-fourth pin hole; 19-second bolt hole; 20-second ramp; 21-second sliding groove; DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] The utility model is further described in detail below with reference to the accompanying drawings:

[0038] The utility model aims to provide a reinforced concrete frame structure with a variable friction-soft steel damper to solve the technical problems in the prior art that the frame structure cannot provide a tensile force in a large deformation stage and the catenary mechanism has low resistance.

[0039] See also Figure 1 , Figure 2 as well as Figure 3 , In one embodiment of the utility model, there is provided a reinforced concrete frame structure with a variable friction-mild steel damper, comprising a reinforced concrete frame body;

[0040] The reinforced concrete frame body comprises a plurality of frame beams 1 and frame columns 2, and the plurality of frame beams 1 and frame columns 2 are respectively and vertically fixedly connected;

[0041] A damper 3 is provided at the vertical angle between the frame beam 1 and the frame column 2. One end of the damper 3 is fixed to the frame beam 1, and the other end is fixed to the frame column 2. A friction plate assembly and an energy-absorbing soft steel assembly are provided inside the damper 3.

[0042] In this embodiment, the energy-absorbing soft steel component includes energy-absorbing soft steel 10 and slotted energy-absorbing soft steel 11. Figure 8 and Fig. 9 shown.

[0043] In this embodiment, the damper 3 is arranged at the node between the frame beam 1 and the frame column 2, and one layer is arranged from the bottom layer of the reinforced concrete frame body or layer by layer from the bottom layer upwards to form a frame structure system with variable friction-mild steel damper.

[0044] Specifically, according to Figure 4 As shown, the friction plate assembly includes two sets of outer friction plates 4 and two sets of inner friction plates 5;

[0045] The two groups of inner friction plates 5 are arranged between the two groups of outer friction plates 4 and are connected through bolts 7 . The energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11 are arranged between the two groups of inner friction plates 5 and are fixedly connected through pins 9 .

[0046] Among them, the structure of two groups of outer friction plates 4 and two groups of inner friction plates 5, as well as energy-absorbing soft steel 10 and slotted energy-absorbing soft steel 11 is fan-shaped, which has a beautiful appearance and can reduce the space occupancy rate and reduce the impact on the use function of the building structure; the deformation at the node is related to the angle, and it is easier to calculate and design when it is set to a fan shape. The fan-shaped damper dissipates energy by rotating, which can have a larger angle and more efficient energy dissipation; compared with the linear damper, to achieve the same energy dissipation capacity, it is usually necessary to set a hinge support, which increases the complexity of installation. The fan-shaped damper can directly use a fixed support, which simplifies the installation process, reduces the construction process, and saves cost.

[0047] Specifically, according to Figure 5 and Figure 6As shown, the two groups of outer friction plates 4 are provided with first bolt holes 12, and the two groups of inner friction plates 5 are provided with first sliding grooves 15 at positions corresponding to the first bolt holes 12; the energy-absorbing soft steel 10 is provided with second bolt holes 19 at positions corresponding to the first bolt holes 12, and the slotted energy-absorbing soft steel 11 is provided with second sliding grooves 21 at positions corresponding to the first bolt holes 12; the bolts 7 drive the two groups of outer friction plates 4 and the two groups of inner friction plates 5 to rotate in the first bolt holes 12, the second bolt holes 19, and the second sliding grooves 21, and drive the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11 to slide in the first sliding grooves 15 along the two groups of inner friction plates 5. Among them, the structure of the first sliding groove 15 is an arc structure, and corresponds to the shapes of the two groups of outer friction plates 4 and the two groups of inner friction plates 5, as well as the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11.

[0048] Specifically, a first ramp 14 is provided on one side of the two groups of outer friction plates 4 close to the two groups of inner friction plates 5; a second ramp 20 is provided on one side of the two groups of inner friction plates 5 close to the two groups of outer friction plates 4; the first ramp 14 and the second ramp 20 are mutually embedded.

[0049] Specifically, according to Figure 6 As shown, a connecting plate 6 is provided between the two sets of outer friction plates 4. Figure 7 As shown; the two groups of outer friction plates 4 are provided with a first pin hole 13 on the plate surface, and the connecting plate 6 is provided with a third pin hole 17 on the plate surface corresponding to the first pin hole 13; the two groups of outer friction plates 4 and the connecting plate 6 are fixedly connected by a pin 9 passing through the first pin hole 13 and the third pin hole 17.

[0050] Specifically, the two groups of inner friction plates 5 are also provided with a second pin hole 16; the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11 are both provided with a fourth pin hole 18 at the position corresponding to the second pin hole 16; the two groups of inner friction plates 5, the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11 are fixedly connected by the pin 9 penetrating the second pin hole 16 and the fourth pin hole 18. Specifically, the bolt 7 is provided with a butterfly spring 8 on the two groups of outer friction plates 4. The butterfly spring 8 has excellent variable stiffness characteristics, strong buffering and shock absorption capabilities, and has the advantages of high bearing capacity and small space occupation; high-strength bolts have high strength, high tightening force and good fatigue resistance; energy-absorbing soft steel has good ductility and energy-absorbing capacity; slotted energy-absorbing soft steel also has the ability to adjust energy-absorbing performance. The combination of these materials has the advantages of simple construction, convenient installation, low cost and easy acquisition. By rationally utilizing these materials, the efficient function of the damper in structural engineering can be realized, and the quality and efficiency of the project can be improved.

[0051] Specifically, the frame beam 1 is connected to one end of the damper 3 through a steel plate by bolts or welding; the frame column 2 is connected to the other end of the damper 3 through a steel plate by bolts or welding.

[0052] Among them, the damper 3 is connected to the frame beam 1 and the frame column 2 through the front and rear end steel plates respectively, the connecting plate 6 is connected to the front end steel plate, the inner friction plate 5, the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11 are connected to the rear end steel plate, the front end steel plate is connected to the frame beam 1, and the rear end steel plate is connected to the frame column 2, and the connection method is bolt connection or welding connection.

[0053] In this embodiment, the inner side of the outer friction plate 4 contains two first ramps 14 and a horizontal section, the outer side of the inner friction plate 5 contains two second ramps 20 and a horizontal section, and is provided with a first sliding groove 15. The two groups of outer friction plates 4 and the two groups of inner friction plates 5 are connected with the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11. Under the action of external force, the two groups of outer friction plates 4 and the two groups of inner friction plates 5 rotate relative to each other, the energy-absorbing soft steel 10 and the slotted energy-absorbing soft steel 11 slide along the slope, the butterfly spring 8 is compressed, the pressure of the butterfly spring 8 increases, the pressure of the butterfly spring changes, and the friction force also changes accordingly, thereby achieving a variable friction effect.

[0054] In this embodiment, the characteristics of variable stiffness and variable friction are utilized, and the energy dissipation capacity and bearing capacity of each stage are adjusted by reasonably designing the damper structural parameters. This can enable the structure to achieve the effect of "less energy consumption in small earthquakes and more energy consumption in large earthquakes" under different earthquake magnitudes; it can enhance the resistance of the catenary mechanism and reduce the probability of continuous collapse.

[0055] During assembly of the utility model, the slopes of the outer friction plate 4 and the connecting plate 6 are aligned, and the bolts 7 equipped with the butterfly springs 8 pass through the bolt holes of the outer friction plate 4 and the inner friction plate 5 to connect with the energy-absorbing soft steel and the slotted energy-absorbing soft steel; at the same time, the pin 9 passes through the pin holes of the outer friction plate-1 and the connecting plate-3 to fix the three; finally, one side of the connecting plate 6 is connected to the front-end steel plate, and the inner friction plate 5, the energy-absorbing soft steel and one side of the slotted energy-absorbing soft steel are connected to the rear-end steel plate; the front-end steel plate is connected to the frame beam 1, and the rear-end steel plate is connected to the frame column 2, and the connection method can be bolt connection or welding connection; the installation of the fan-shaped variable friction-soft steel damper energy-absorbing armpit support is completed.

[0056] In summary, the utility model provides a reinforced concrete frame structure with a variable friction-soft steel damper, which is simpler in structure, more convenient in construction, and has excellent performance. It can simultaneously improve the seismic performance and progressive collapse resistance of the structure, and improve the comprehensive defense capability of the structure against earthquakes and progressive collapse, which has important social value and economic benefits, and its installation is easy to be widely applied and promoted.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A reinforced concrete frame structure with a variable friction-mild steel damper, characterized in that: It includes a reinforced concrete frame body; The reinforced concrete frame body comprises a plurality of frame beams (1) and frame columns (2), wherein the plurality of frame beams (1) and frame columns (2) are respectively and vertically fixedly connected; A damper (3) is provided at a vertical angle between the frame beam (1) and the frame column (2); one end of the damper (3) is fixed to the frame beam (1), and the other end is fixed to the frame column (2); a friction plate assembly and an energy-absorbing soft steel assembly are provided in the damper (3).

2. A reinforced concrete frame structure with a variable friction-mild steel damper according to claim 1, characterized in that: The friction plate assembly comprises two groups of outer friction plates (4) and two groups of inner friction plates (5); the energy-absorbing soft steel assembly comprises energy-absorbing soft steel (10) and slotted energy-absorbing soft steel (11); The two groups of inner friction plates (5) are arranged between the two groups of outer friction plates (4) and are connected through bolts (7); the energy-absorbing soft steel (10) and the slotted energy-absorbing soft steel (11) are arranged between the two groups of inner friction plates (5) and are fixedly connected through pins (9).

3. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 2, characterized in that: The two groups of outer friction plates (4), the two groups of inner friction plates (5), the energy-absorbing soft steel (10), and the slotted energy-absorbing soft steel (11) are in a fan-shaped structure.

4. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 2, characterized in that: The two groups of outer friction plates (4) are provided with first bolt holes (12), and the two groups of inner friction plates (5) are provided with first sliding grooves (15) at positions corresponding to the first bolt holes (12); the energy-absorbing soft steel (10) is provided with second bolt holes (19) at positions corresponding to the first bolt holes (12), and the slotted energy-absorbing soft steel (11) is provided with second sliding grooves (21) at positions corresponding to the first bolt holes (12); the bolts (7) drive the two groups of outer friction plates (4) and the two groups of inner friction plates (5) to rotate in the first bolt holes (12), the second bolt holes (19) and the second sliding grooves (21), and drive the energy-absorbing soft steel (10) and the slotted energy-absorbing soft steel (11) to slide in the first sliding grooves (15) along the two groups of inner friction plates (5).

5. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 4, characterized in that: The structure of the first sliding groove (15) is an arc-shaped structure, and corresponds to the shapes of the two groups of outer friction plates (4) and the two groups of inner friction plates (5), the energy-absorbing soft steel (10), and the slotted energy-absorbing soft steel (11).

6. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 2, characterized in that: A first ramp (14) is provided on one side of the two groups of outer friction plates (4) close to the two groups of inner friction plates (5); a second ramp (20) is provided on one side of the two groups of inner friction plates (5) close to the two groups of outer friction plates (4); and the first ramp (14) and the second ramp (20) are mutually embedded.

7. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 2, characterized in that: A connecting plate (6) is further provided between the two groups of outer friction plates (4); first pin holes (13) are provided on the plate surfaces of the two groups of outer friction plates (4) correspondingly, and third pin holes (17) are provided on the plate surface of the connecting plate (6) correspondingly to the first pin holes (13); the two groups of outer friction plates (4) and the connecting plate (6) are fixedly connected via a pin (9) penetrating the first pin holes (13) and the third pin holes (17).

8. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 2, characterized in that: The two groups of inner friction plates (5) are also provided with second pin holes (16); the energy-absorbing soft steel (10) and the slotted energy-absorbing soft steel (11) are both provided with fourth pin holes (18) at positions corresponding to the second pin holes (16); the two groups of inner friction plates (5) and the energy-absorbing soft steel (10) and the slotted energy-absorbing soft steel (11) are fixedly connected by a pin (9) penetrating the second pin holes (16) and the fourth pin holes (18).

9. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 2, characterized in that: The bolt (7) is provided with a butterfly spring (8) on the two sets of outer friction plates (4).

10. A reinforced concrete frame structure with variable friction-mild steel damper according to claim 1, characterized in that: The frame beam (1) is connected to one end of the damper (3) through a steel plate by bolts or welding; and the frame column (2) is connected to the other end of the damper (3) through a steel plate by bolts or welding.

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