A buckling-restrained brace

Abstract

The present invention discloses a buckling-restrained brace, which comprises an installation mechanism and a deformation amplification mechanism. The deformation amplification mechanism is built in the installation mechanism. The deformation amplification mechanism includes a main tooth member, a gear set and a mounting plate. Rack teeth are arranged on both sides of the main tooth member. The two groups of gear sets are respectively installed on both sides of the main tooth member and are used in cooperation with the rack teeth one by one. The main tooth member and the gear set are arranged between two parallel mounting plates and are used in cooperation with each other. Beneficial effects: The buckling-restrained brace of the present invention does not need to connect the support rod to the building main body; the support rod is directly omitted, without occupying a large building space; moreover, the energy dissipation and shock absorption efficiency of the buckling-restrained brace of the present invention is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorption and energy dissipation, and particularly relates to a buckling-restrained brace. Background Art

[0002] China is one of the countries with the most serious earthquake disasters in the world. The damage and collapse of building structures under earthquake actions will cause heavy casualties and huge property losses. The energy dissipation and shock absorption technology can significantly improve the seismic performance of building structures. Among the energy dissipation and shock absorption devices, the buckling-restrained brace is widely used due to its stable mechanical properties and remarkable energy dissipation effect.

[0003] The essence of the buckling-restrained brace for shock absorption is to consume the earthquake input energy through the elastoplastic hysteretic deformation of the energy dissipation inner core, thereby reducing the earthquake action acting on the main structure. The greater the relative deformation at both ends of the energy dissipation inner core, the more significant the energy dissipation and shock absorption effect of the buckling-restrained brace. The deformation of the energy dissipation inner core is generally positively correlated with the inter-story deformation of the main structure. However, paradoxically, in structural design, the main structure is basically not allowed to have large inter-story deformations. Therefore, in the actual application process of the buckling-restrained brace, due to limited deformation, there are generally problems such as the underutilization of energy dissipation capacity and the lack of prominent energy dissipation effect.

[0004] In this context, the technical concept of deformation amplification is proposed. At present, the deformation amplification technology for the buckling-restrained brace mainly relies on a geometrically variable system (composed of the buckling-restrained brace body and multiple support rods, and the multiple support rods need to be installed at a fixed angle, and different building bodies need to match different support rod lengths), so that the relative deformation at both ends of the buckling-restrained brace is much larger than the inter-story deformation of the main structure. As Figure 12 shown, the black part in the figure is the buckling-restrained brace body. Although the related technology can achieve the effect of deformation amplification, there are problems such as many components in the system, high construction accuracy requirements, and large occupation of building space, so the actual engineering application is relatively limited. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies of the prior art and provide a buckling-restrained brace, which includes an installation mechanism and a deformation amplification mechanism. The installation mechanism provides a complete and effective deformation space and deformation conditions for the deformation amplification mechanism, and realizes energy dissipation and shock absorption, while the deformation amplification mechanism realizes the functions of receiving energy - deforming energy - transferring energy. The main tooth part in the deformation amplification mechanism is directly connected to the building main body. When the main tooth part receives the earthquake input energy, through the meshing transmission of the gear set and the inner rack of the core plate, the core plate realizes elastoplastic hysteretic deformation in the cavity formed by the enclosure of the H-shaped steel, the cushion strip and the cover plate to dissipate energy, thereby reducing the earthquake action acting on the building main body. The buckling-restrained brace of the present invention does not require the connection of support rods to the building main body; the support rods are directly omitted, without occupying a large building space; and the energy dissipation and shock absorption efficiency of the buckling-restrained brace of the present invention is higher.

[0006] The object of the present invention is achieved by the following technical measures: A buckling-restrained brace, comprising a mounting mechanism and a deformation amplification mechanism, wherein the deformation amplification mechanism is built in the mounting mechanism. The deformation amplification mechanism includes a main tooth member, a gear set and a mounting plate. Rack teeth are provided on both sides of the main tooth member. Two sets of the gear sets are respectively mounted on both sides of the main tooth member and are in one-to-one correspondence and cooperation with the rack teeth. Two mounting plates are arranged in parallel. The main tooth member and the gear set are arranged between the two mounting plates. The length direction of the main tooth member is parallel to the mounting plate, and the length direction of the gear set is perpendicular to the mounting plate and is connected to the mounting plate. The gear set includes a wheel shaft, a large gear and a small gear. The large gear and the small gear are sleeved on the wheel shaft. There are two large gears, and the small gear is arranged between the two large gears. The small gear meshes with the rack teeth on the main tooth member. Spacing is provided between the large gear and the small gear and between the large gear and the mounting plate to facilitate the free rotation of the large gear or the small gear. The diameter of the large gear is larger than that of the small gear.

[0007] Further, mounting holes are provided on the mounting plate, and the wheel shaft is mounted through the mounting holes. A mounting platform extends from one side of the mounting plate. When the deformation amplification mechanism is mounted on the mounting mechanism, the height of the mounting platform is less than the height of the mounting plate, and the height center line of the mounting platform coincides with the height center line of the mounting plate.

[0008] Further, the mounting mechanism includes a main body frame made of H-shaped steel, and one deformation amplification mechanism is correspondingly arranged at each of the two ends in the length direction of the main body frame.

[0009] Further, the mounting platforms of the deformation amplification mechanism are all inserted into the H-shaped steel and fixedly connected to the H-shaped steel, and one side of the mounting plate limits the insertion depth into the H-shaped steel.

[0010] Further, a limiting post extends from one end of the main tooth member in the length direction, and the rack teeth of the main tooth member do not continue on the limiting post. When the deformation amplification mechanism is mounted and connected to the main body frame, the limiting post is arranged at the end of the main tooth member away from the main body frame. The limiting post is used to limit the stroke of the small gear, and the buckling-restrained brace is connected to the outside through the limiting post.

[0011] Further, the mounting mechanism includes a core plate. Inner rack teeth are provided on one side surface of the core plate. Four inner rack teeth are provided on a single core plate, and the inner rack teeth are arranged in parallel in pairs at both ends of the core plate. The length direction of the inner rack teeth is consistent with the length direction of the core plate. One core plate is provided on each of the two side surfaces of the H-shaped steel. When the deformation amplification mechanism is mounted and connected to the main body frame, the inner rack teeth on the core plate are in one-to-one correspondence and meshing with the large gears in the gear set. The end tails of the core plate in the length direction are arranged between the two mounting plates.

[0012] Further, notches are respectively formed on both sides of the core plate in the width direction.

[0013] Further, the installation mechanism includes a cover plate and cushion strips. Two cushion strips are symmetrically arranged on one side of a single cover plate. The cushion strips are connected to the cover plate, and the length direction of the cushion strips is consistent with the length direction of the cover plate. A convex edge extends outward from one side of the cushion strip in the length direction. When the cover plate covers the core plate, the convex edge is used in cooperation with the notch.

[0014] Further, the length of the convex edge is less than the length of the notch. Arc-shaped edges are respectively provided at both ends of the length of the notch, and arc-shaped transition edges are respectively provided at both ends of the length of the convex edge. The arc-shaped edges are used in cooperation with the arc-shaped transition edges. The thickness of the cushion strip is greater than the thickness of the core plate.

[0015] Further, a limiting notch is formed on the cover plate. The cover plate, the cushion strip and the H-shaped steel are fixed by bolts. When the cover plate covers the core plate and is connected to the H-shaped steel, the limiting notch is in one-to-one correspondence and cooperation with the mounting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: For a buckling-restrained brace, the installation mechanism provides a complete and effective deformation space and deformation conditions for the deformation amplification mechanism, and realizes energy dissipation and shock absorption, while the deformation amplification mechanism realizes the functions of receiving energy - deforming energy - transmitting energy. The main tooth part in the deformation amplification mechanism is directly connected to the building main body. When the main tooth part receives the input energy of an earthquake, through the meshing transmission of the gear set and the rack in the core plate, the core plate realizes elastoplastic hysteretic deformation in the cavity formed by the enclosure of the H-shaped steel, the cushion strip and the cover plate to dissipate energy, thereby reducing the seismic action acting on the building main body. The buckling-restrained brace of the present invention does not require a support rod to be connected to the building main body; the support rod is directly omitted, and there is no need to occupy a large building space; moreover, the energy dissipation and shock absorption efficiency of the buckling-restrained brace of the present invention is higher.

[0017] The following will describe the present invention in detail with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of the structure of the buckling-restrained brace.

[0019] Figure 2 is an exploded view of the structure of the deformation amplification mechanism.

[0020] Figure 3 is a structural diagram of the buckling-restrained brace.

[0021] Figure 4 is an exploded view of the installation structure of the deformation amplification mechanism and the H-shaped steel.

[0022] Figure 5 is a schematic structural diagram of the gear set.

[0023] Figure 6 It is a schematic structural diagram of the main tooth part.

[0024] Figure 7 It is a schematic structural diagram of the H-shaped steel.

[0025] Figure 8 It is a schematic structural diagram of the core plate.

[0026] Figure 9 It is a schematic structural diagram of the internal rack.

[0027] Figure 10 It is a schematic structural diagram of the spacer bar.

[0028] Figure 11 It is a schematic structural diagram of the cover plate.

[0029] Figure 12 It is a schematic structural diagram of three common buckling-restrained braces in the prior art.

[0030] Among them, 1. main tooth part, 2. gear set, 3. mounting plate, 4. axle, 5. large gear, 6. small gear, 7. mounting table, 8. H-shaped steel, 9. limit post, 10. core plate, 11. internal rack, 12. cover plate, 13. spacer bar, 14. notch, 15. convex edge, 16. limit notch, 17. bolt, 18. rack, 19. mounting hole. Specific embodiments

[0031] Such as Figures 1 to 11As shown in the figure, a buckling-restrained brace includes an installation mechanism and a deformation amplification mechanism. The deformation amplification mechanism is built into the installation mechanism. The deformation amplification mechanism includes a main tooth member 1, a gear set 2, and a mounting plate 3. Rack bars 18 are provided on both sides of the main tooth member 1. Two sets of the gear sets 2 are respectively installed on both sides of the main tooth member 1 and are in one-to-one correspondence and cooperation with the rack bars 18. Two mounting plates 3 are arranged in parallel. The main tooth member 1 and the gear set 2 are arranged between the two mounting plates 3. The length direction of the main tooth member 1 is parallel to the mounting plate 3, and the length direction of the gear set 2 is perpendicular to the mounting plate 3 and is connected to the mounting plate 3. The gear set 2 includes a wheel shaft 4, a large gear 5, and a small gear 6. The large gear 5 and the small gear 6 are sleeved on the wheel shaft 4. There are two large gears 5, and the small gear 6 is arranged between the two large gears 5. The small gear 6 meshes with the rack bar 18 on the main tooth member 1. Spacings that are conducive to the free rotation of the large gear 5 or the small gear 6 are provided between the large gear 5 and the small gear 6 and between the large gear 5 and the mounting plate 3. The diameter of the large gear 5 is larger than the diameter of the small gear 6. The deformation amplification mechanism is directly transmitted to the core plate 10 through the cooperation of the gear and the rack bar 18, making the deformation amplification function of the deformation amplification mechanism of the present invention more sensitive than that of the prior art, and at the same time, the structure is relatively compact. The installation mechanism provides a complete and effective deformation space and deformation conditions for the deformation amplification mechanism and realizes energy dissipation and shock absorption, while the deformation amplification mechanism realizes the functions of receiving energy - deforming energy - transmitting energy. The main tooth member 1 in the deformation amplification mechanism is directly connected to the building main body. When the main tooth member 1 receives the input energy of an earthquake, the main tooth member 1 transmits the energy to the small gear 6 of the gear set 2. The rotation of the small gear 6 drives the large gear 5 to rotate through the wheel shaft 4. Due to the diameter design of the large gear 5 and the small gear 6, the input earthquake energy is transformed and then transmitted to the core plate 10. The earthquake energy is directly transmitted to the energy-dissipating core plate 10, so that the core plate 10 can enter the elastoplastic large deformation state even when the deformation of the building main body is small, and thus the energy dissipation and shock absorption are carried out efficiently. The energy dissipation and shock absorption efficiency of the present invention is better than that of the prior art. The buckling-restrained brace of the present invention is directly connected to the building main body through the main tooth member 1, without the need for a support rod to be connected to the building main body and without the requirement for the installation angle between the support rods, so the installation is simpler and the building space occupied is smaller.

[0032] The mounting plate 3 is provided with mounting holes 19. The axle 4 is installed through the mounting holes 19, and the axle 4 can rotate freely in the mounting holes 19. The rotation of the axle 4 drives the large gear 5 to rotate. One side of the mounting plate 3 extends out an installation platform 7. When the deformation amplification mechanism is installed on the installation mechanism, the height of the installation platform 7 is less than the height of the mounting plate 3, and the height center line of the installation platform 7 coincides with the height center line of the mounting plate 3. The height design of the installation platform 7 and the mounting plate 3 can position the deformation amplification mechanism in the middle of the main frame. One deformation amplification mechanism is respectively positioned and installed at both ends of the length of one main frame, which can better transfer the earthquake input energy to both ends of the core plate 10. The deformation energy consumption of one core plate 10 can consume the input energy from the opposite directions of the building main body.

[0033] The installation mechanism includes a main frame, and the main frame adopts an H-shaped steel 8. One deformation amplification mechanism is respectively arranged at both ends of the main frame in the length direction. The H-shaped steel 8 in this invention has two functions. It is both a buckling restraint member of the core plate 10 and bears the axial load transmitted by the deformation amplification mechanism. This main frame can improve the safety and reliability of the buckling-resistant brace.

[0034] The installation platform 7 of the deformation amplification mechanism is entirely inserted into the H-shaped steel 8 and fixedly connected to the H-shaped steel 8. One side of the mounting plate 3 limits the insertion depth into the H-shaped steel 8.

[0035] One end of the main tooth part 1 extends out a limit post 9 in the length direction. The rack 18 of the main tooth part 1 does not continue on the limit post 9. When the deformation amplification mechanism is installed and connected to the main frame, the limit post 9 is arranged at one end of the main tooth part 1 away from the main frame. The limit post 9 is used to limit the stroke of the small gear 6, and the buckling-resistant brace is connected to the outside (building main body) through the limit post 9.

[0036] The installation mechanism includes a core plate 10. Internal racks 1811 are arranged on one of the side surfaces of the core plate 10. Four internal racks 1811 are arranged on a single core plate 10. The internal racks 1811 are arranged in parallel in pairs at both ends of the core plate 10. The length direction of the internal racks 1811 is the same as the length direction of the core plate 10. One core plate 10 is respectively arranged on both side surfaces of the H-shaped steel 8. When the deformation amplification mechanism is installed and connected to the main frame, the internal racks 1811 on the core plate 10 are respectively meshed with the large gears 5 in the gear set 2 one by one. The end tails of the core plate 10 in the length direction are arranged between 2 mounting plates 3. The 2 core plates 10 arranged oppositely on the H-shaped steel 8 can effectively improve its ultimate bearing capacity and energy consumption capacity. At the same time, the two core plates 10 are respectively connected to the large gears 5 in the deformation amplification mechanisms at both ends of the length direction of the H-shaped steel 8. The symmetrical layout can avoid the eccentric force in the deformation amplification mechanism, and further make the overall force of the buckling-resistant brace more reasonable. The core plate 10 is made of steel material.

[0037] The buckling-restrained brace can change its own elastic stiffness and energy dissipation effect only by adjusting the diameter ratio of the large gear 5 to the small gear 6 without changing the size of the core plate 10, which is beneficial to realizing standardized design, production and construction.

[0038] Notches 14 are respectively formed on both sides of the core plate 10 in the width direction. The installation mechanism includes a cover plate 12 and a cushion strip 13. Two cushion strips 13 are symmetrically arranged on one side surface of a single cover plate 12, and the length of the cushion strip 13 is the same as the length of the H-shaped steel 8. The cushion strip 13 is fixedly connected with the cover plate 12, and the length direction of the cushion strip 13 is consistent with the length direction of the cover plate 12. A convex edge 15 extends outwards on one side of the cushion strip 13 in the length direction. When the cover plate 12 covers the core plate 10, the convex edge 15 is used in cooperation with the notch 14. The length of the convex edge 15 is less than the length of the notch 14. Arc-shaped edges are respectively arranged at both ends of the length of the notch 14, and arc-shaped transition edges are respectively arranged at both ends of the length of the convex edge 15. The arc-shaped edge is used in cooperation with the arc-shaped transition edge. The thickness of the cushion strip 13 is greater than the thickness of the core plate 10. Specifically, the thickness of the cushion strip 13 is 1-2 mm greater than the thickness of the core plate 10. The settings of the thicknesses of the cushion strip 13 and the core plate 10 provide a deformable space condition for the core plate 10. Bolt holes are formed in the cover plate 12, the cushion strip 13 and the H-shaped steel 8, and the three are fixedly connected together by bolts 17. The cover plate 12, the two cushion strips 13 and the H-shaped steel 8 enclose a cavity together. The core plate 10 penetrates through the length direction of the cavity and undergoes elastoplastic deformation in the cavity. The specific layout of enclosing to form the cavity: the cover plate 12 is arranged parallel to the steel flange of the H-shaped steel 8, the length directions of the cover plate 12 and the H-shaped steel 8 are consistent, and the cushion strip 13 is arranged between the cover plate 12 and the steel flange of the H-shaped steel 8. The two cushion strips 13 are respectively arranged on both sides of the cover plate 12 in the width direction.

[0039] A limiting notch 16 is formed in the cover plate 12. The cover plate 12, the cushion strip 13 and the H-shaped steel 8 are fixed together by bolts 17. When the cover plate 12 covers and connects the core plate 10 and the H-shaped steel 8, the limiting notch 16 is in one-to-one correspondence and cooperation with the mounting plate 3. The length of the limiting notch 16 is the same as the width of the mounting plate 3.

[0040] In order to ensure that the structures can operate normally with each other and play a better shock absorption and energy dissipation role, the lengths and installation positions of each component are introduced:

[0041] Core plate 10: (1) The length l1 of the internal rack 1811 needs to be determined according to the ultimate displacement δ of the building main structure design max and the deformation magnification factor α. The specific calculation formula is l1 = 2αδ max, where the coefficient 2 takes into account the reciprocating characteristics of disasters such as earthquakes, and it is necessary to ensure that the internal rack 1811 has sufficient stroke in both positive and negative directions. The remaining dimensions of the internal rack 1811 need to be determined by strength calculation according to the design ultimate bearing capacity of the support.

[0042] (2) The width and thickness of the core plate 10. The width b2 and thickness t2 of the middle section of the core plate 10 (the entire covered length of the notch 14) are determined according to the design yield force of the buckling-restrained brace, and it is advisable to make 4 ≤ b2 / t2 ≤ 10. The width b3 of the enlarged section at the end of the core plate 10 (one end of the core plate 10 after removing the covered length of the notch 14) should not be less than 2b2 to ensure that the enlarged section at the end of the core plate 10 is always in the elastic working stage during the whole working process, so as to be able to be closely combined with the deformation amplification mechanism and transmit force reliably. The total length l2 of the enlarged section at the end of the core plate 10 is 2 times the length l1 of the internal rack 1811 to prevent the internal rack 1811 from directly contacting the flange of the H-shaped steel 8 during the working process. The total length l3 of the core plate 10 needs to be determined by calculation according to the design stiffness of the support. The notches 14 symmetrically opened on both sides of the core plate 10 in the length direction make the core plate 10 into a variable cross-section shape.

[0043] H-shaped steel 8: The total length l4 of the H-shaped steel 8 is the total length l3 of the core plate 10 minus 3 times the length l1 of the internal rack 1811, that is, l4 = l3 - 3l1. The specific dimensions of the flange and web of the H-shaped steel 8 need to be determined by calculation according to the design stiffness requirements of the support member and the dimensions of the core plate 10. At the same time, it is necessary to ensure that the internal net height hw of the two flanges of the H-shaped steel 8 is equal to the height h1 of the mounting table 7 on the mounting plate 3 for subsequent assembly. The flanges of the H-shaped steel 8 need to be drilled in advance, and the hole spacing and hole size are determined by calculation according to the design ultimate bearing capacity of the buckling-restrained brace, the dimensions of the core plate 10, and the mechanical properties of the high-strength bolts 17 to be used.

[0044] Padding strip 13: The padding strip 13 is designed and processed according to the variable cross-section shape and dimensions of the core plate 10. The padding strip 13 is the same length as the H-shaped steel 8 (both are l4). The cutting length of the end of the padding strip 13 (refers to the end of the padding strip 13 after removing the covered convex edge 15) is equal to the length of the internal rack 1811 (both are l1). The width b5 of the end of the padding strip 13 = 0.5 * [b4 - b3 - (2 - 4 mm)], and the width b6 of the middle section of the padding strip 13 (the covered length of the convex edge 15) = 0.5 * [b4 - b2 - (2 - 4 mm)]. In addition, the thickness t5 of the padding strip 13 should be 1 - 2 mm larger than the thickness t2 of the core plate 10 to ensure that the lateral expansion deformation (Poisson effect) of the core plate 10 during the compression process can be fully released.

[0045] Gear set 2: Determine the detailed dimensions of gear set 2 according to the requirements of the deformation magnification factor and the design bearing capacity. The ratio of the pitch circle diameters of the large gear 5 and the small gear 6, d2 / d1, is the design deformation magnification factor α of the buckling restraint brace. The remaining detailed dimensions should be determined through strength checks based on the design ultimate load.

[0046] Mounting plate 3 and mounting table 7: The height of the mounting table 7 needs to be the same as the clear height of the flange of the H-shaped steel 8 to be used (both are h1). The height h2 of the mounting plate 3 is the sum of the total height h1 of the H-shaped steel 8 to be used, the total thickness 2t5 of the spacer 13, and the total thickness 2t6 of the cover plate 12 to be used (i.e., h2 = hw + 2t4 + 2t5 + 2t6). The width of the mounting plate 3 is 1.5l1. The distance from the hole position to one side edge of the width of the mounting plate 3 is l1 / 2. The distance h3 from the hole position to one side edge of the height of the mounting plate 3 is h3 = t1 + t5 + t6 + d2 / 2. The thickness t3 of the mounting plate 3 or the mounting table 7 should meet the local bearing strength requirements at the wheel shaft 4 in the gear set 2.

[0047] Cover plate 12: The rectangular steel plate is formed into the cover plate 12 by cutting limiting notches 16 at the four corners. The cover plate 12 is the same length as the core plate 10 (both are l3). The uncut width of the cover plate 12 is the same as the width of the flange of the H-shaped steel 8 (both are b4). The cutting length of the cover plate 12 (the length of the limiting notch 16) is the same as the length of the mounting plate 3 (both are 1.5l1). The cutting width of the cover plate 12 (the width of the limiting notch 16) is the same as the thickness of the mounting plate 3 (both are t3).

[0048] Main tooth part 1: The effective length (including the length of the limiting post 9) l5 of the main tooth part 1 is not less than 2 times the design ultimate displacement δ of the building main structure max of the rack 18, and the height h4 = h2 - 2h3 - d1.

[0049] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0050] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0051] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A buckling-restrained brace, comprising a mounting mechanism and a deformation amplification mechanism, the deformation amplification mechanism being built into the mounting mechanism, characterized in that: The deformation and amplification mechanism includes a main tooth member, a gear set, and a mounting plate. Rack teeth are provided on both sides of the main tooth member. Two sets of the gear sets are respectively mounted on both sides of the main tooth member and are in one-to-one correspondence with the rack teeth for cooperation. Two mounting plates are arranged in parallel. The main tooth member and the gear set are arranged between the two mounting plates. The length direction of the main tooth member is parallel to the mounting plate, and the length direction of the gear set is perpendicular to the mounting plate and is connected to the mounting plate. The gear set includes a wheel shaft, a large gear, and a small gear. The large gear and the small gear are sleeved on the wheel shaft. There are two large gears. The small gear is arranged between the two large gears. The small gear meshes with the rack teeth on the main tooth member. Spaces conducive to the free rotation of the large gear or the small gear are provided between the large gear and the small gear and between the large gear and the mounting plate. The diameter of the large gear is larger than that of the small gear. Mounting holes are provided on the mounting plate, and the wheel shaft is installed through the mounting holes. An installation platform extends from one side of the mounting plate. When the deformation and amplification mechanism is installed on the installation mechanism, the height of the installation platform is less than the height of the mounting plate, and the height center line of the installation platform coincides with the height center line of the mounting plate. The installation mechanism includes a main body frame made of H-shaped steel. One deformation and amplification mechanism is respectively provided at both ends of the main body frame in the length direction. The installation platforms of the deformation and amplification mechanisms are all inserted into the H-shaped steel and fixedly connected to the H-shaped steel. One side of the mounting plate limits the insertion depth into the H-shaped steel. A limiting post extends from one end of the main tooth member in the length direction. The rack teeth of the main tooth member do not continue on the limiting post. When the deformation and amplification mechanism is installed and connected to the main body frame, the limiting post is arranged at the end of the main tooth member away from the main body frame. The limiting post is used to limit the stroke of the small gear. The buckling-resistant brace is externally connected through the limiting post. The installation mechanism includes a core plate. Inner rack teeth are provided on one side surface of the core plate. Four inner rack teeth are provided on a single core plate. The inner rack teeth are arranged in parallel in pairs at both ends of the core plate. The length direction of the inner rack teeth is consistent with the length direction of the core plate. One core plate is respectively provided on two side surfaces of the H-shaped steel. When the deformation and amplification mechanism is installed and connected to the main body frame, the inner rack teeth on the core plate are in one-to-one correspondence and mesh with the large gears in the gear set. The end of the core plate in the length direction is arranged between the two mounting plates.

2. The buckling-restrained brace according to claim 1, wherein: Notches are respectively provided on both sides of the core plate in the width direction.

3. The buckling-restrained brace according to claim 2, wherein: The installation mechanism includes a cover plate and cushion strips. Two cushion strips are symmetrically arranged on one side surface of a single cover plate. The cushion strips are connected to the cover plate. The length direction of the cushion strips is consistent with the length direction of the cover plate. A convex edge extends outward from one side of the cushion strips in the length direction. When the cover plate covers the core plate, the convex edge is used in cooperation with the notch.

4. The buckling-restrained brace according to claim 3, wherein: The length of the convex edge is less than the length of the notch. Arc-shaped edges are respectively provided at both ends of the length of the notch. Arc-shaped transition edges are respectively provided at both ends of the length of the convex edge. The arc-shaped edges are used in cooperation with the arc-shaped transition edges. The thickness of the cushion strip is greater than the thickness of the core plate.

5. The buckling-restrained brace according to claim 3, wherein: A limiting notch is formed on the cover plate. The cover plate, the cushion strip and the H-shaped steel are fixed by bolts. When the cover plate covers the connection between the core plate and the H-shaped steel, the limiting notch is in one-to-one correspondence and cooperation with the mounting plate.

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