Buckling restrained brace device for building damping

Abstract

The invention relates to a buckling restrained brace device for building shock absorption, which comprises a restraint sleeve, two groups of energy consumption inner cores, a friction damping mechanism, a mounting head and a deformation recovery mechanism, the restraint sleeve sleeves the outer sides of the two groups of energy consumption inner cores, one ends of the two groups of energy consumption inner cores are connected through the friction damping mechanism, and the other ends of the two groups of energy consumption inner cores are respectively connected with the mounting head; the deformation recovery mechanism is connected between the constraint sleeve and each group of energy consumption inner cores and comprises an upper limiting piece, a lower limiting piece and a disc spring, and the disc spring is arranged between the upper limiting piece and the lower limiting piece; the upper limiting piece and the lower limiting piece respectively comprise an inner ring and an outer ring, the outer ring is fixedly installed on the inner wall of the restraining sleeve, the inner ring is fixedly installed on the outer wall of the energy consumption inner core, and the outer diameter of the inner ring is smaller than the inner diameter of the outer ring. When a building structure is vibrated, the energy consumption inner core is bent and deformed to consume the energy of an earthquake, and meanwhile, the deformation recovery mechanism is utilized to help the energy consumption inner core to quickly recover the initial shape after the energy consumption inner core is bent and deformed, so that the whole buckling restrained brace device can be repeatedly used.

Description

Technical Field

[0001] The present invention relates to the technical field of energy dissipation and seismic reduction of building structures, and particularly relates to a buckling-restrained brace device for building seismic reduction. Background Art

[0002] In recent years, with the continuous development of academic research and engineering technology in the field of earthquakes in China, in the field of building structures, seismic reduction devices are often set on structures to consume the input energy of earthquakes, so as to achieve the purpose of reducing the seismic response of the main structure. Among them, buckling-restrained braces are increasingly used in engineering and have achieved remarkable results.

[0003] Under the action of compression, ordinary steel braces are prone to buckling instability because there is no restraint member to inhibit their deformation. The buckling-restrained brace is connected to the frame beam and frame column through connection nodes. Under the action of an earthquake, the energy dissipation core plate enters the yield state to dissipate the energy input into the structure. However, to avoid low-cycle fatigue failure of the buckling-restrained brace, the buckling-restrained brace is designed as an elastic brace under frequent earthquakes. But the buckling-restrained brace remains in an elastic state and cannot dissipate the energy input by the earthquake. At the same time, due to the increase in the stiffness of the building structure, the building structure may be subjected to a greater earthquake action.

[0004] Moreover, large plastic deformations will occur in the buckling-restrained brace to dissipate seismic energy, resulting in the structure being prone to serious residual deformations after a strong earthquake. According to statistics, under strong earthquake excitation, the average residual deformation of the buckling-restrained brace frame reaches 0.8 - 1.8%. And excessive residual deformations will cause a significant increase in the collapse probability of the damaged building structure during aftershocks, and a significant increase in the repair difficulty and cost of the structure after the earthquake. Summary of the Invention

[0005] The present invention provides a buckling-restrained brace device for building seismic reduction to solve the above technical problems.

[0006] To solve the above technical problems, the present invention provides a buckling-restrained brace device for building seismic reduction, including a restraint sleeve, an energy dissipation inner core, a friction damping mechanism, a mounting head, and a deformation recovery mechanism.

[0007] There are two groups of the energy dissipation inner cores. The restraint sleeve is sleeved outside the two groups of energy dissipation inner cores. One ends of the two groups of energy dissipation inner cores are connected through the friction damping mechanism, and the other ends of the two groups of energy dissipation inner cores are respectively connected to the mounting head.

[0008] The deformation recovery mechanism is connected between the constraint sleeve and each group of energy dissipation inner cores. The deformation recovery mechanism includes an upper limit member, a lower limit member and a disc spring. The disc spring is arranged between the upper limit member and the lower limit member. The upper limit member and the lower limit member respectively include an inner ring and an outer ring. The outer ring is fixedly installed on the inner wall of the constraint sleeve, and the inner ring is fixedly installed on the outer wall of the energy dissipation inner core. The outer diameter of the inner ring is smaller than the inner diameter of the outer ring.

[0009] Preferably, at least two deformation recovery mechanisms are provided on each energy dissipation inner core, and the two deformation recovery mechanisms are respectively arranged at both ends of the energy dissipation inner core.

[0010] Preferably, the friction damping mechanism includes a friction core rod, a rack, a friction plate, a roller shaft, a gear, a friction ring, a positioning rod and a shock absorption spring. The two ends of the shock absorption spring are respectively fixedly connected to one end of the friction core rod, and the other end of the friction core rod is fixedly connected to the energy dissipation inner core. The friction plates are symmetrically installed on the inner wall of the constraint sleeve and are in frictional contact with the outer wall of the friction core rod. The rack is arranged on the outer wall of the friction core rod. The gear is fixedly installed on the inner wall of the constraint sleeve through the roller shaft, and the gear meshes with the rack. The friction ring is sleeved on the roller shaft and is in frictional contact with the roller shaft. The outer wall of the friction ring is fixedly connected to the inner wall of the constraint sleeve through the positioning rod.

[0011] Preferably, the friction core rod, the friction plate and the friction ring are all made of friction materials.

[0012] Preferably, the cross section of the friction plate is arc-shaped and wraps around both sides of the friction core rod, and the rack is arranged between every two friction plates.

[0013] Preferably, a plurality of friction rings are arranged along the extending direction of the roller shaft.

[0014] Preferably, the friction ring includes a first friction ring, a second friction ring and a third friction ring, and the inner diameters of the first friction ring, the second friction ring and the third friction ring are different. The inner wall of the first friction ring is directly in frictional contact with the outer wall of the roller shaft. Centrifugal friction components corresponding to the second friction ring and the third friction ring are installed on the outer wall of the roller shaft, and the second friction ring and the third friction ring are respectively in frictional contact with the corresponding centrifugal friction components.

[0015] Preferably, the centrifugal friction component includes an installation groove, a compression spring and a friction block. The installation groove is annularly opened on the surface of the roller shaft, and the friction block is arranged inside the installation groove through the compression spring. The elastic coefficients of each compression spring are different.

[0016] Preferably, the larger the inner diameter of the friction ring, the larger the elastic coefficient of the compression spring in the corresponding centrifugal friction assembly.

[0017] Preferably, the mounting head includes a mounting bracket, a cover plate and a mounting seat. One side of the cover plate is fixedly connected to the energy-consuming inner core, and the other side is fixedly connected to the mounting bracket through the mounting seat; the outer diameter of the cover plate is smaller than the inner diameter of the outer ring.

[0018] Compared with the prior art, the buckling-restrained brace device for building shock absorption provided by the present invention has the following advantages:

[0019] 1. The present invention adopts a deformation recovery mechanism, which can utilize the elastic potential energy of the deformation recovery mechanism to restore the deformation after the energy-consuming inner core buckles and deforms; when the building structure encounters vibration, first, the energy-consuming inner core buckles and deforms to consume the energy of the earthquake, and the deformation recovery mechanism uses the characteristics of the spring to help the energy-consuming inner core quickly restore its initial shape after buckling deformation to ensure overall reusable.

[0020] 2. The present invention can transfer the excess energy to the friction damping mechanism by arranging the friction damping mechanism between two groups of energy-consuming inner cores. The friction damping mechanism consumes the excess energy by friction heating to reduce the burden on the energy-consuming inner core and prevent the energy-consuming inner core from failing due to excessive deformation.

[0021] 3. The present invention sets a centrifugal friction assembly on the friction damping mechanism, which can enable the friction damping mechanism to obtain multiple damping coefficients. As the damping coefficient increases step by step, the energy consumption becomes greater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the buckling-restrained brace device for building shock absorption in a specific embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of the friction damping mechanism in a specific embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of the deformation recovery mechanism in a specific embodiment of the present invention;

[0025] Figure 4 is a top view of the friction damping mechanism in a specific embodiment of the present invention;

[0026] Figure 5 is a cross-sectional view of the friction damping mechanism in a specific embodiment of the present invention.

[0027] In the figure: 1 - Constraint sleeve; 2 - Friction damping mechanism; 202 - Friction mandrel; 203 - Rack; 204 - Friction plate; 205 - Roller shaft; 206 - Gear; 207 - Friction ring; 208 - Positioning rod; 209 - Shock-absorbing spring; 3 - Deformation recovery mechanism; 301 - Inner ring; 302 - Outer ring; 303 - Disc spring; 4 - Mounting head; 401 - Mounting bracket; 402 - Cover plate; 403 - Mounting seat; 5 - Energy-consuming inner core; 6 - Centrifugal friction assembly; 601 - Mounting groove; 602 - Compression spring; 603 - Friction block. Specific embodiments

[0028] In order to describe the technical solutions of the above invention in more detail, specific embodiments are listed below to prove the technical effects; it should be emphasized that these embodiments are used to illustrate the present invention and not to limit the scope of the present invention.

[0029] The buckling-restrained brace device for building shock absorption provided by the present invention, as Figures 1 to 4 shown, includes a constraint sleeve 1, an energy-consuming inner core 5, a friction damping mechanism 2, a mounting head 4 and a deformation recovery mechanism 3, wherein:

[0030] There are two groups of the energy-consuming inner cores 5. In practice, concrete or mortar can be filled in the constraint sleeve 1, and the surface of the energy-consuming inner core 5 is covered with a non-bonding material. The constraint sleeve 1 is sleeved outside the two groups of the energy-consuming inner cores 5. One ends of the two groups of the energy-consuming inner cores 5 are connected through the friction damping mechanism 2, and the other ends of the two groups of the energy-consuming inner cores 5 are respectively connected to the mounting head 4. The energy-consuming inner core 5 deforms under tension or compression, and its deformation can drive the friction damping mechanism 2 to move and generate friction to consume the remaining energy. When a medium earthquake or a major earthquake comes, the energy-consuming inner core 5 will transfer the excess energy to the friction damping mechanism 2, and the energy that cannot be offset by the energy-consuming inner core 5 is consumed through the back-and-forth friction of the friction damping mechanism 2.

[0031] The deformation recovery mechanism 3 is connected between the constraint sleeve 1 and each group of energy-consuming inner cores 5. The deformation recovery mechanism 3 includes an upper limit member, a lower limit member and a disc spring 303. The disc spring 303 is arranged between the upper limit member and the lower limit member; the upper limit member and the lower limit member respectively include an inner ring 301 and an outer ring 302. The outer ring 302 is fixedly installed on the inner wall of the constraint sleeve 1, the inner ring 301 is fixedly installed on the outer wall of the energy-consuming inner core 5, and the outer diameter of the inner ring 301 is smaller than the inner diameter of the outer ring 302.

[0032] The working process of the deformation recovery mechanism 3 is as follows: Under normal conditions, the top end of the disc spring 303 contacts both the inner ring 301 and the outer ring 302 of the upper limit member, and its bottom end contacts both the inner ring 301 and the outer ring 302 of the lower limit member. When the energy-consuming inner core 5 is in a tensile state, the inner ring 301 of the lower limit member and the outer ring 302 of the upper limit member compress the disc spring 303. When the energy-consuming inner core 5 is in a buckling state, the inner ring 301 of the upper limit member and the outer ring 302 of the lower limit member compress the disc spring 303. As can be seen from Figure 3 this, whether it is the inner ring 301 or the outer ring 302, both can support or squeeze the disc spring 303. Therefore, whether the energy-consuming inner core 5 is in tension or compression, the disc spring 303 will be in a squeezed state. When the energy-consuming inner core 5 is no longer in tension or compression, in order to restore its initial state, the disc spring 303 will do work on the energy-consuming inner core 5 to help the energy-consuming inner core 5 quickly return to its initial state.

[0033] In the present invention, by providing the deformation recovery mechanism 3, after the energy-consuming inner core 5 buckles and deforms, its own elastic potential energy is used to restore the deformation. When the building structure encounters vibration, first, the energy-consuming inner core 5 buckles and deforms to consume the energy of the earthquake, and the deformation recovery mechanism 3 uses the characteristics of the spring to help the energy-consuming inner core 5 quickly restore its initial shape after buckling deformation to ensure that the whole can be reused.

[0034] In some embodiments, please refer with emphasis to Figure 3 , each of the energy-consuming inner cores 5 is provided with at least two of the deformation recovery mechanisms 3, and the two deformation recovery mechanisms 3 are respectively disposed at both ends of the energy-consuming inner core 5. According to the force analysis during the buckling deformation of the structure, the middle part of the energy-consuming inner core 5 is the part where the force is the largest, and the two end parts are the parts where the force is the smallest. Therefore, setting the deformation recovery mechanism 3 at a position close to the end can prevent the deformation recovery mechanism 3 from being damaged when the energy-consuming inner core 5 buckles and deforms.

[0035] In some embodiments, please refer with emphasis to Figure 2 and Figure 4, the friction damping mechanism 2 includes a friction mandrel 202, a rack 203, friction plates 204, a roller shaft 205, a gear 206, a friction ring 207, a positioning rod 208 and a shock-absorbing spring 209. Both ends of the shock-absorbing spring 209 are fixedly connected to one end of the friction mandrel 202, and the other end of the friction mandrel 202 is fixedly connected to the energy-consuming inner core 5; the friction plates 204 are symmetrically installed on the inner wall of the restraint sleeve 1 and are in frictional contact with the outer wall of the friction mandrel 202. The rack 203 is arranged on the outer wall of the friction mandrel 202, the gear 206 is fixedly installed on the inner wall of the restraint sleeve 1 through the roller shaft 205, and the gear 206 meshes with the rack 203. The friction ring 207 is sleeved on the roller shaft 205 and is in frictional contact with the roller shaft 205, and the outer wall of the friction ring 207 is fixedly connected to the inner wall of the restraint sleeve 1 through the positioning rod 208. When the friction mandrel 202 is in a tensile or compressive state, it moves along the inner wall of the restraint sleeve 1. At the same time, the outer wall of the friction mandrel 202 frictions with the friction plates 204, and the cooperation of the rack 203 and the gear 206 drives the roller shaft 205 to rotate, so that the inner wall of the roller shaft 205 frictions with the friction ring 207, thereby consuming excess energy by friction heating, reducing the burden on the energy-consuming inner core 5, and preventing the energy-consuming inner core 5 from failing due to excessive deformation.

[0036] In some embodiments, the friction mandrel 202, the friction plates 204 and the friction ring 207 are all made of friction materials, which can be metal friction materials, non-metal friction materials, or composite friction materials, as long as they have good friction coefficients and wear resistance.

[0037] In some embodiments, please refer to Figure 4 for key reference. The cross-section of the friction plate 204 is arc-shaped and covers both sides of the friction mandrel 202. The rack 203 is arranged between every two friction plates 204, that is, two friction plates 204 and two racks 203 are arranged in a cross-cross manner, improving the mechanical properties and heat dissipation performance.

[0038] In some embodiments, please refer to Figure 2 , Figure 4 and Figure 5 for key reference. A plurality of friction rings 207 are arranged along the extension direction of the roller shaft 205, increasing the frictional resistance. At the same time, through the independent control of the friction rings 207, the friction damping mechanism 2 is subdivided into a multi-stage energy-consuming mode.

[0039] In this embodiment, please refer to Figure 5, the friction ring 207 includes a first friction ring, a second friction ring, and a third friction ring, and the inner diameters of the first friction ring, the second friction ring, and the third friction ring are different; the inner wall of the first friction ring is in direct frictional contact with the outer wall of the roller shaft 205; centrifugal friction assemblies 6 corresponding to the second friction ring and the third friction ring respectively are installed on the outer wall of the roller shaft 205, and the second friction ring and the third friction ring are in frictional contact with the corresponding centrifugal friction assemblies 6 respectively, so that the friction damping mechanism 2 obtains multiple damping coefficients.

[0040] In some embodiments, please continue to refer to Figure 5 , the centrifugal friction assembly 6 includes an installation groove 601, a compression spring 602, and a friction block 603. The installation groove 601 is annularly formed on the surface of the roller shaft 205. The friction block 603 is arranged inside the installation groove 601 through the compression spring 602. The elastic coefficients of each compression spring 602 are different. The larger the inner diameter of the friction ring 207, the larger the elastic coefficient of the compression spring 602 in the corresponding centrifugal friction assembly 6. The inner diameter of the second friction ring is larger than that of the first friction ring, and the inner diameter of the third friction ring is larger than that of the second friction ring. The friction block 603 can friction with the inner wall of the friction ring 207 under the action of centrifugal force to consume energy. For the convenience of description, the compression spring with a smaller elastic coefficient is denoted as spring A, and the compression spring with a larger elastic coefficient is denoted as spring B.

[0041] In practice, the greater the vibration energy borne by the building, the greater the scale and number of buckling deformations of the energy-consuming inner core 5. Similarly, it means that the faster the friction mandrel 202 moves back and forth inside the constraint sleeve 1. Since the friction mandrel 202 can drive the roller shaft 205 to rotate, the rotation speed of the roller shaft 205 is faster. The faster the rotation speed of the roller shaft 205, the stronger the centrifugal force generated by it.

[0042] When encountering a small earthquake, the moving speed of the friction mandrel 202 back and forth is slow, and the centrifugal force generated by the roller shaft 205 cannot enable the friction block 603 to overcome the binding force of the compression spring 602 and frictionally connect with the second friction ring and the third friction ring;

[0043] When encountering a medium earthquake, the moving speed of the friction mandrel 202 back and forth becomes faster, and the centrifugal force generated by the roller shaft 205 can overcome the binding force of spring A. At this time, the friction block 603 connected to spring A is frictionally connected to the inner wall of the second friction ring, and the excess energy is converted into heat through friction;

[0044] When encountering a major earthquake, the moving speed of the friction mandrel 202 back and forth increases sharply. The centrifugal force generated by the roller 205 can overcome the restraint forces of both spring A and spring B at the same time. At this time, the friction block 603 connected to spring A is frictionally connected to the inner wall of the second friction ring, and the friction block connected to spring B is frictionally connected to the inner wall of the third friction ring. The excess energy is converted into heat through friction.

[0045] In this way, it can be adaptively adjusted to a multi-stage energy dissipation mode according to the magnitude of the vibration.

[0046] In some embodiments, please refer specifically to Figure 1 and Figure 3 , the mounting head 4 includes a mounting bracket 401, a cover plate 402 and a mounting seat 403. One side of the cover plate 402 is fixedly connected to the energy dissipation inner core 5 through the mounting seat 403, and the other side is fixedly connected to the mounting bracket 401 through the mounting seat 403; the outer diameter of the cover plate 402 is smaller than the inner diameter of the outer ring 302, so that the cover plate 402 can pass through the outer ring 302 and enter the interior of the restraint sleeve 1.

[0047] The working principle of the buckling-restrained brace device for building shock absorption provided by the present invention is as follows:

[0048] When the energy dissipation inner core 5 is in tension, the inner ring 301 of the lower limit member and the outer ring 302 of the upper limit member compress the disc spring 303. At the same time, the energy dissipation inner core 5, as an energy transfer structure, transfers the tensile force to the friction damping mechanism 2. Here, it can be divided into two cases. When the energy received by the energy dissipation inner core 5 is small, the energy dissipation inner core 5 cannot force the friction damping mechanism 2 to move, and at this time, the energy dissipation inner core 5 consumes the energy; when the energy borne by the energy dissipation inner core 5 is large, the friction mandrel 202 will overcome the frictional resistance and move up and down, converting the excess energy into heat through friction to consume the energy. At the same time, the shock absorption spring 209 will also be stretched, and the stretching of the shock absorption spring 209 will also consume energy.

[0049] When the energy dissipation inner core 5 is in compression, the inner ring 301 of the upper limit member and the outer ring 302 of the lower limit member compress the disc spring 303. At the same time, the energy dissipation inner core 5, as an energy transfer structure, transfers the tensile force to the friction damping mechanism 2. The same as the above process, when the energy borne by the energy dissipation inner core 5 is large, the excess energy will be consumed by the friction damping mechanism 2.

[0050] The centrifugal friction assembly 6 in the friction damping mechanism 2 will determine whether to friction with its corresponding friction ring 207 according to the magnitude of the vibration, so as to be subdivided into a multi-stage energy dissipation mode.

[0051] It should be noted that the increase in frictional resistance means a stronger braking ability for the friction mandrel 202. When the braking ability becomes stronger, the moving speed of the friction mandrel 202 and the rotation speed of the roller 205 will decrease. Once the rotation speed of the roller 205 decreases, the centrifugal force generated by it will also decrease. At this time, the frictional resistance provided by the centrifugal friction assembly 6 will also decrease accordingly. Based on this, the centrifugal friction assembly 6 does not always work, but repeatedly switches between the start-stop-start-stop states, which can not only ensure sufficient frictional resistance but also increase the service life of the centrifugal friction assembly 6.

[0052] In summary, the buckling-restrained brace device for building shock absorption provided by the present invention includes a restraint sleeve 1, an energy-dissipating inner core 5, a friction damping mechanism 2, a mounting head 4, and a deformation recovery mechanism 3. There are two groups of the energy-dissipating inner cores 5. The restraint sleeve 1 is sleeved outside the two groups of the energy-dissipating inner cores 5. One ends of the two groups of the energy-dissipating inner cores 5 are connected by the friction damping mechanism 2, and the other ends of the two groups of the energy-dissipating inner cores 5 are respectively connected to the mounting head 4. The deformation recovery mechanism 3 is connected between the restraint sleeve 1 and each group of the energy-dissipating inner cores 5. The deformation recovery mechanism 3 includes an upper limit member, a lower limit member, and a disc spring 303. The disc spring 303 is arranged between the upper limit member and the lower limit member. The upper limit member and the lower limit member respectively include an inner ring 301 and an outer ring 302. The outer ring 302 is fixedly installed on the inner wall of the restraint sleeve 1, and the inner ring 301 is fixedly installed on the outer wall of the energy-dissipating inner core 5. The outer diameter of the inner ring 301 is smaller than the inner diameter of the outer ring 302. By setting the deformation recovery mechanism 3, the present invention enables the energy-dissipating inner core 5 to recover its deformation by using its own elastic potential energy after buckling deformation. When the building structure encounters vibration, first, the energy-dissipating inner core 5 buckles and deforms to consume the energy of the earthquake, and the deformation recovery mechanism 3 uses the characteristics of the spring to help the energy-dissipating inner core 5 quickly recover to its initial shape after buckling deformation to ensure that the whole can be reused.

[0053] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A buckling restrained brace device for building shock absorption, characterized in that: It includes a restraining sleeve, an energy-absorbing inner core, a friction damping mechanism, a mounting head and a deformation recovery mechanism. There are two groups of energy-absorbing inner cores, and the constraint sleeves are sleeved on the outside of the two groups of energy-absorbing inner cores. One ends of the two groups of energy-absorbing inner cores are connected through the friction damping mechanism, and the other ends of the two groups of energy-absorbing inner cores are respectively connected to the mounting heads; The deformation recovery mechanism is connected between the constraint sleeve and each group of energy-absorbing inner cores, and includes an upper limit member, a lower limit member and a disc spring, wherein the disc spring is arranged between the upper limit member and the lower limit member; the upper limit member and the lower limit member respectively include an inner ring and an outer ring, wherein the outer ring is fixedly mounted on the inner wall of the constraint sleeve, and the inner ring is fixedly mounted on the outer wall of the energy-absorbing inner core, and the outer diameter of the inner ring is smaller than the inner diameter of the outer ring.

2. The buckling restrained brace device for building shock absorption according to claim 1, characterized in that: Each of the energy-absorbing inner cores is provided with at least two of the deformation recovery mechanisms, and the two deformation recovery mechanisms are respectively and correspondingly arranged at two ends of the energy-absorbing inner core.

3. The buckling restrained brace device for building shock absorption according to claim 1, characterized in that: The friction damping mechanism includes a friction core rod, a rack, a friction plate, a roller shaft, a gear, a friction ring, a positioning rod and a shock-absorbing spring. The two ends of the shock-absorbing spring are respectively fixedly connected to one end of the friction core rod, and the other end of the friction core rod is fixedly connected to the energy-absorbing inner core; the friction plate is symmetrically installed on the inner wall of the constraint sleeve and is in friction contact with the outer wall of the friction core rod; the rack is arranged on the outer wall of the friction core rod, and the gear is fixedly installed on the inner wall of the constraint sleeve through the roller shaft, and the gear is meshed with the rack; the friction ring is sleeved on the roller shaft and is in friction contact with the roller shaft, and the outer wall of the friction ring is fixedly connected to the inner wall of the constraint sleeve through the positioning rod.

4. The buckling restrained brace device for building shock absorption according to claim 3, characterized in that: The friction core rod, friction plate and friction ring are all made of friction material.

5. The buckling restrained brace device for building shock absorption according to claim 3, characterized in that: The cross section of the friction plate is arc-shaped and covers both sides of the friction core rod, and the rack is arranged between every two friction plates.

6. The buckling restrained brace device for building shock absorption according to claim 3, characterized in that: The friction rings are arranged in a plurality along the extending direction of the roller shaft.

7. The buckling restrained brace device for building shock absorption according to claim 6, characterized in that: The friction rings include a first friction ring, a second friction ring and a third friction ring, wherein the first friction ring, the second friction ring and the third friction ring have different inner diameters; the inner wall of the first friction ring is in direct friction contact with the outer wall of the roller shaft; centrifugal friction components corresponding to the second friction ring and the third friction ring are installed on the outer wall of the roller shaft, and the second friction ring and the third friction ring are in friction contact with the corresponding centrifugal friction components respectively.

8. The buckling restrained brace device for building shock absorption according to claim 7, characterized in that: The centrifugal friction assembly includes a mounting groove, a compression spring and a friction block. The mounting groove is annularly opened on the surface of the roller shaft. The friction block is arranged inside the mounting groove through the compression spring. The elastic coefficient of each compression spring is different.

9. The buckling restrained brace device for building shock absorption according to claim 8, characterized in that: The larger the inner diameter of the friction ring is, the larger the elastic coefficient of the corresponding compression spring in the centrifugal friction assembly is.

10. The buckling restrained brace device for building shock absorption according to claim 1, characterized in that: The mounting head includes a mounting bracket, a cover plate and a mounting seat. One side of the cover plate is fixedly connected to the energy-absorbing inner core, and the other side is fixedly connected to the mounting bracket through the mounting seat. The outer diameter of the cover plate is smaller than the inner diameter of the outer ring.

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