A buckling-restrained core unit structure and brace with large displacement and high performance

Abstract

The present invention provides a buckling-restrained core unit structure and brace with large displacement and high performance, which relates to the field of seismic resistance technology. The buckling-restrained brace with large displacement and high performance mainly includes: a first set of core unit groups, a second set of core unit groups, an outer restraint sleeve, and a limit mechanism; wherein, the core unit group is composed of a core unit and an intermediate plate; the limit device is composed of a limit guide tube, a stiffening rib, an end plate, and an anti-lateral buckling restraint block. By adopting the principle of superposition of the working displacement amounts of two sets of core units, the present invention solves the problem that the working displacement amount of a conventional buckling-restrained brace is relatively small, and realizes the requirement of a large deformation working displacement per unit length of the buckling-restrained brace; on the other hand, the load-bearing tonnage is designed by adjusting the width and thickness of the adjustment section. According to the actual engineering requirements, the two sets of core units can be designed as buckling-restrained braces with the same tonnage or double-stage yield type buckling-restrained braces with different tonnages.

Description

Technical Field

[0001] The present invention relates to the technical field of buckling-restrained brace structures in building seismic technologies, and particularly relates to a large-displacement, high-performance buckling-restrained core unit structure and brace. Background Art

[0002] China is located between the Circum-Pacific seismic belt and the Eurasian seismic belt, with relatively frequent seismic activities, and is one of the countries in the world that is severely affected by earthquake disasters. In order to protect life and property safety to the greatest extent, scholars at home and abroad have been continuously exploring shock-absorbing measures that are safe, reliable, economical, and applicable. The buckling-restrained brace is a brace that combines the dual functions of an ordinary brace and a metal damper. The restoring force symmetry in tension and compression is basically the same, forming a full hysteresis curve, and has good capabilities. The buckling-restrained brace originated in the 1980s. With the large-scale and complexity of modern building structure designs, and the increasing requirements for structural safety, the conventional buckling-restrained braces of structures cannot meet the needs of special building structures; therefore, more and more new types of buckling-restrained braces have emerged continuously, improving the performance and engineering applicability of buckling-restrained braces through structural improvements, new material applications, etc. Currently, the conventional single-core unit structure buckling-restrained brace cannot meet the performance requirements under large story drift angles of buildings, especially the fatigue performance. The core unit of the buckling-restrained brace is made of metal. As the metal deformation increases, its fatigue performance drops sharply. Therefore, it is difficult to temporarily achieve the improvement of the fatigue performance of the brace under large story drift angles by applying new materials. Through the structural improvement method of connecting two core units in series, the superposition of working displacement can be achieved, so that when the building structure has a large story drift angle, the brace can maintain normal operation and exert a stable energy dissipation capacity. Summary of the Invention

[0003] To solve the deficiencies and defects existing in the above-mentioned prior art, the inventor has developed and designed a buckling-restrained brace for a steel frame or a concrete frame. On the one hand, it solves the need for a large deformation displacement per unit length of the buckling-restrained brace; on the other hand, it realizes the need for the two-core unit to achieve a double-stage yielding function.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A buckling-restrained core unit structure with large displacement and high performance, which is installed inside the outer restraint sleeve (3) and extends to both ends, includes two sets of core units arranged side by side: the first core unit (1) and the second core unit (2). Each set of core unit groups has a fixed end distributed outward and a movable end distributed inward. The fixed ends are respectively fixed to both ends of the outer restraint sleeve. The two sets of core units are installed in a reverse and overlapping manner to form a series force connection, and the movable end of each set of core unit groups can displace in the compression or tensile displacement space provided at the corresponding end of the outer restraint sleeve.

[0006] Further, the first core unit is a straight plate core material, and the second core unit is two parallel straight plate core materials. The straight plate core material of the first core unit is distributed between the two straight plate core materials of the second core unit.

[0007] Further, the two sets of core units are both dumbbell-shaped plates that are narrow in the middle and wide at both ends, and isolation layer materials are pasted on the surfaces; each core unit of the two sets of core units is buckling-restrained with the same specifications, sizes, and the same tonnage; or double-stage yielding with different specifications, sizes, and different tonnages.

[0008] Each core unit of the two sets of core units is respectively of different thicknesses and the same width; or the same thickness and different widths.

[0009] On the other hand, the present invention provides a buckling-restrained core unit structure and support with large displacement and high performance, including a core unit, a restraint unit, and a displacement mechanism unit, wherein: the core unit includes two sets of core unit groups arranged side by side, and each set of core unit groups has a fixed end and a movable end; the restraint unit is an outer restraint sleeve, the two sets of core unit groups are placed inside the outer restraint sleeve and are respectively fixed to both ends of the outer restraint sleeve at the fixed ends, and the two sets of core unit groups are installed in a reverse and overlapping manner to form a series force connection; the movable end of each set of core unit groups can compress or stretch displace in the displacement mechanism unit provided at the corresponding end of the outer restraint sleeve.

[0010] In the external shape structure of the present invention, the two sets of core units are arranged side by side, but in essence, the two sets of core units pass through the middle plate and are then connected in series by the outer restraint sleeve. The force transmission line is as follows: Thus, the superposition of the working displacements of the first core unit and the second core unit per unit length of the buckling-restrained support is achieved. By adjusting the width, thickness, and structural form of the core unit, the present invention can be designed as a buckling-restrained support with the same tonnage or a double-stage yielding type of buckling-restrained support with different tonnages.

[0011] Introduction to the working principle and beneficial effects of the present invention: The two sets of core units of the present invention are arranged side by side. Substantially, the two sets of core units pass through the intermediate plate and are connected in series by an external restraint sleeve. The force transmission line is as follows: Thus, the superposition of the working displacements of the first core unit and the second core unit per unit length of the buckling-restrained brace is achieved, meeting the requirement of a large deformation displacement of the buckling-restrained brace. When the two sets of core units are designed with the same tonnage, whether in the case of small earthquakes, medium earthquakes, or large earthquakes, the two sets of core units are in a synchronous working state and work within the maximum displacement range designed by the limit device. When the two sets of core units are designed with different tonnages, in the case of small or medium earthquakes, the first core unit first undergoes plastic deformation, and the second core unit remains elastic; as the seismic intensity increases and develops into a large earthquake, when the (tensile or compressive) deformation displacement of the first core unit reaches the designed maximum displacement, the first limit mechanism begins to function to limit the further deformation of the first core unit; at the same time, the second core unit gradually begins to enter plastic deformation and works within the designed maximum displacement range of the core unit. This structure is applicable to buildings of concrete structures and steel structures, especially prefabricated seismic reduction buildings. On the one hand, by adopting the principle of superposition of the working displacement amounts of the two sets of core units, the problem of relatively small working displacement amount of the conventional buckling-restrained brace is solved, and the requirement of a large deformation working displacement per unit length of the buckling-restrained brace is achieved; on the other hand, the load-bearing tonnage is designed by adjusting the width and thickness of the adjustment section. According to the actual engineering requirements, the two sets of core units can be designed as buckling-restrained braces with the same tonnage or double-stage yielding type buckling-restrained braces with different tonnages. Brief Description of the Drawings

[0012] Figure 1 is the main perspective view of the structure of the buckling-restrained brace of the present invention;

[0013] Figure 2 is the main top view of the structure of the buckling-restrained brace of the present invention;

[0014] Figure 3 is the schematic structural view of the core unit of the buckling-restrained brace of the present invention;

[0015] Figure 4 is the exploded view of the component structure of the movable end of the second set of core unit groups of the present invention;

[0016] Figure 5 is the exploded view of the component structure of the movable end of the first set of core unit groups of the present invention;

[0017] Figure 6 is the schematic perspective three-dimensional structure view of the buckling-restrained brace of the present invention;

[0018] Figure 7Perspective front view of the movable end of the first group of core unit groups (fixed end of the second group of core unit groups);

[0019] Figure 8 Perspective top view of the movable end of the second group of core unit groups (fixed end of the first group of core unit groups);

[0020] Figure 9 Perspective front view of the movable end of the first group of core unit groups (fixed end of the second group of core unit groups);

[0021] Figure 10 Perspective top view of the movable end of the first group of core unit groups (fixed end of the second group of core unit groups);

[0022] Figure 11 Schematic diagram of the principle of the buckling-restrained brace of the present invention in the tensile state;

[0023] Figure 12 Schematic diagram of the principle of the buckling-restrained brace of the present invention in the compressive state;

[0024] Figure 13 Schematic three-dimensional structure diagram of the buckling-restrained brace of the present invention;

[0025] Figure 14 Experimental result diagram of the displacement of the buckling-restrained brace of the present invention under various fatigue conditions;

[0026] Figures 15 - 18 Schematic diagram of different unit cross-sectional shapes.

[0027] Wherein: 1 - first core unit, 2 - second core unit, 3 - outer restraint sleeve, 4 - intermediate plate, 5 - rectangular slot, 6 - limit guiding tube, 7 - anti-lateral buckling restraint block, 8 - stiffening rib, 9 - limit block, 10 - end plate, 11 - hole slot. Detailed implementation manners

[0028] The technical solution of the buckling-restrained brace provided by the present invention will be further described below in conjunction with specific embodiments and their accompanying drawings. In combination with the following description, the advantages and features of the present invention will become clearer.

[0029] It should be noted that the embodiments of the present invention have good implementability and are not any form of limitation to the present invention. The technical features or combinations of technical features described in the embodiments of the present invention should not be considered isolated, and they can be combined with each other to achieve better technical effects. The scope of the preferred implementation manners of the present invention may also include other implementations, and should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0030] The descriptions of the left and right directions mentioned in the following text are based on the perspective direction shown in the drawings of the present invention; the first limiting mechanism represents the limiting mechanism of the movable end of the first group of core unit groups; the second limiting mechanism represents the limiting mechanism of the movable end of the second group of core unit groups; the first stiffening rib represents the stiffening rib of the movable end of the first group of core unit groups; the second stiffening rib represents the stiffening rib of the movable end of the second group of core unit groups; the second end plate represents the end plate through which the movable end of the second group of core unit groups can pass; the first end plate represents the end plate through which the movable end of the first group of core unit groups can pass.

[0031] Embodiment 1: A buckling-restrained core unit structure with large displacement and high performance, as Figure 3 , 11 , 12 shows, installed inside the outer restraint sleeve and extending to both ends, including the first and second groups of core units arranged side by side: the first core unit and the second core unit. Each group of core unit groups has a fixed end distributed outward and a movable end distributed inward. The fixed ends are respectively fixed to both ends of the outer restraint sleeve. The two sets of core units are installed in a reverse and overlapping manner to form a series-connected force-bearing connection, and the movable ends of each group of core unit groups can displace in the compression or tension displacement space provided at the corresponding ends of the outer restraint sleeve. The first core unit is a straight plate member core material, and the second core unit is two parallel straight plate member core materials. The straight plate member core material of the first core unit is distributed between the two straight plate member core materials of the second core unit.

[0032] Preferably, both groups of core units are dumbbell-shaped plates that are narrow in the middle and wide at both ends, and an isolation layer material is pasted on the surface. Each core unit of the two sets of core units is a buckling restraint of the same tonnage with equal specifications and dimensions; or a double-stage yield with different specifications and dimensions.

[0033] Preferably, each core unit of the two groups of core units is respectively of different thicknesses and the same width; or the same thickness and different widths.

[0034] Preferably, the cross-sectional shape of the core unit is cross-shaped and is symmetrically distributed along the center of the first core unit.

[0035] Preferably, as Figures 15 - 18As shown in the figure, the cross-sectional shape of the first core unit is in the shape of a capital "I", and the cross-sectional shape of the second core unit is in the shape of an inverted "T", and is symmetrically distributed along the center axis of the first core unit group. By increasing the cross-sectional area of the core unit, the bearing capacity of the support is improved, and structural forms such as cross-shaped, I-shaped, and T-shaped can effectively enhance the overall stability of the core unit and the support. Preferably, the cross-sectional shape of the core unit is in the shape of an "I", and is symmetrically distributed along the center axis of the first core unit. And the thickness of the first core unit is greater than that of the second unit, or the height of the first core unit is longer than that of the second unit. Preferably, corresponding displacement limit structures and anti-lateral buckling constraint structures are provided behind the fixed ends of the core units, which are used to limit the displacement limit of the first core unit or the second core unit during compression or tension, and to limit lateral buckling.

[0036] The core of this embodiment lies in that displacement superposition of simultaneous opposite compression or reverse tension can be achieved between two groups of juxtaposed core units. That is, the force transmission line between the core units is: To achieve the superposition of the working displacements of the first core unit and the second core unit per unit length of the buckling-restrained brace, and to achieve the function of large deformation displacement of the buckling-restrained brace.

[0037] Embodiment 2: General Structure Review of Buckling-Restrained Brace

[0038] A buckling-restrained core unit structure and brace with large displacement and high performance. The first group of core unit groups includes a first core unit 1, and the second group of core unit groups includes two second core units 2 distributed in parallel. The first core unit 1 is located in the middle of the two second core units 2; the core units of each group of core unit groups are buckling-restrained with equal specifications, sizes, and the same tonnage; or double-stage yielding with different specifications, sizes, and different tonnages; or each core unit has different thicknesses and the same width; or the same thickness and different widths.

[0039] The core unit is a straight plate-shaped core material, and the cross-sectional shape can be cross-shaped, I-shaped or |-shaped; or, the cross-sectional shape of the first core unit 1 is in the shape of a capital "I", and the cross-sectional shape of the second core unit 2 is in the shape of an inverted "T".

[0040] Each group of core unit groups further includes: intermediate plates 4 rigidly connected to both ends of the outer restraint sleeve 3. The intermediate plates 4 at each end are rigidly connected to the fixed ends of their respective group of core unit groups, and rectangular slots 5 corresponding to the shapes and quantities of the movable ends of the other core units are provided on the intermediate plates 4, so that the movable ends of the first and second core units of the two groups of core unit groups can respectively pass through the intermediate plates 4 on the fixed ends of the other party.

[0041] The displacement mechanism unit further includes: a limiting mechanism disposed behind the intermediate plate 4 of each group of core unit groups, which is used to limit the displacement limit of the first group of core unit groups or the second group of core unit groups during compression or tension, to limit lateral instability, and to guide displacement.

[0042] Preferably, the limiting mechanism includes: a limiting guide tube 6, a lateral instability prevention constraint block 7, a stiffening rib 8, a limiting block 9, and an end plate 10; wherein: the left and right ends of the limiting guide tube 6 are respectively connected to the end plate 10 and the intermediate plate 4, the lateral instability prevention constraint block 7 is installed inside the limiting guide tube 6, the stiffening rib 8 is placed inside the lateral instability prevention constraint block 7 and is rigidly connected to the movable ends of each group of core unit groups, and the end plate 10 is provided with a hole groove 11 of a corresponding shape that can allow the stiffening rib 8 and the movable ends of the core unit groups to pass through the end plate 10; the limiting block 9 is fixedly connected to the inner side end of the stiffening rib 8, the limiting block 9 is normally placed between the end plate 10 and the intermediate plate 4, but the shape of the limiting block 9 makes it unable to pass through the end plate 10 and the intermediate plate 4, and the displacement distances between the limiting block 9 and the end plate 10 and the intermediate plate 4 respectively are the compression displacement stroke and the tensile displacement stroke of the movable ends of each group of core unit groups.

[0043] The lateral instability prevention constraint blocks 7 are installed and fixed on the inner wall of the limiting guide tube 6 in several pieces, and form a gap with a specific shape between them, so that the gap formed between them can not only meet the requirements that the movable ends of the core unit groups, the stiffening rib 8, and the limiting block 9 can smoothly guide and slide in the gap, but also limit and prevent the core unit groups from laterally instabilizing during displacement.

[0044] The force transmission path of this buckling-restrained brace is: To achieve the superposition of the working displacements of the first core unit 1 and the second core unit 2 per unit length of the buckling-restrained brace, and to achieve the function of large deformation displacement of the buckling-restrained brace.

[0045] Embodiment 3: Detailed description of the actual installation structure

[0046] As Figure 1 shown, the core unit is a dumbbell-shaped plate with a narrow middle and wide ends. Among them, the narrow middle part is called the segment, the wide ends are called the connecting segments, and the part between them is called the transition segment; according to the different lengths, the connecting segments are divided into long ends and short ends. The width and thickness of the segment need to be determined according to the design tonnage. According to the actual engineering requirements, the two groups of core units can be designed with the same tonnage or different tonnages of double-stage yielding; therefore, the first core unit 1 and the second core unit 2 can be designed with the same specification / model of material, such as Figure 2 shown; or different specifications / models of materials can be used, such as Figure 3As shown in the figure. The connecting section should ensure the stiffness and stability during the working process and not buckle. Therefore, its width needs to meet the appropriate connection consumption area ratio (cross-sectional area of the connecting section / cross-sectional area of the section).

[0047] There are 2 intermediate plates 4 in this unit. Each intermediate plate 4 is provided with 3 identical grooved through holes, and the sizes of the groove holes (length and width) are determined according to the size of the connecting section of the core unit.

[0048] For the first group of core unit groups, the short end of the connecting section of the first core unit 1 penetrates into the middle groove hole of one intermediate plate 4, and a rigid connection is adopted with plug welding on the back of the groove hole and fillet welding on the front. For the second group of core unit groups, the short end of the connecting section of the second core unit 2 penetrates into the 2 groove holes on the side of the other intermediate plate 4, and a rigid connection is adopted with plug welding on the back of the groove hole and fillet welding on the front. The surface of the core unit needs to be pasted with an isolation layer material to play the role of reserving a buckling gap and reducing the friction with the filling material; in order to give full play to its buckling performance, an isolation layer with a suitable thickness is selected according to the different thicknesses of the core unit plates.

[0049] The long ends of the connecting sections of the first group of core unit groups and the second group of core unit groups respectively penetrate into the two ends of the outer restraint sleeve 3, and then the long end of the connecting section of the first group of core unit groups penetrates out of the middle groove hole of the intermediate plate 4 of the second group of core unit groups, and at the same time, the long end of the connecting section of the second group of core unit groups penetrates out of the two groove holes on the side of the intermediate plate 4 of the first group of core unit groups. The inner sides of the intermediate plates 4 of the two core unit groups are respectively in close contact with the end faces of the outer restraint sleeve 3 and are firmly welded by butt welding. Through the combination of the above core units and the outer restraint sleeve 3, the main structure of the buckling restraint brace is formed. In the main structure, the gap between the inside of the outer restraint sleeve 3 and the core unit needs to be filled with a dense filling material.

[0050] Composition of the first limiting mechanism: First, the first stiffener is welded to the long end of the connecting section of the first core unit 1 in a corner joint form to form a "cross-shaped" support end; there are 4 L-shaped anti-lateral buckling restraint blocks 7; the two outer sides of the L shape are respectively adjacent to the surface of the first stiffener and the first core unit 1. Second, the stiffener 8 rigidly connected to the movable end of the second group of core unit groups is a long strip plate, and a limiting block 9 is installed at the inner end of the long strip plate, and the two side faces of the long strip plate are fixedly connected between the two movable end heads of the second core unit 2 of the second group of core unit groups; the above first stiffener and the L-shaped anti-lateral buckling restraint block 7 are inserted into the limiting guide tube 6. On the one hand, one end of the limiting guide tube 6 is in close contact with the intermediate plate 4 and is firmly welded by butt welding. On the other hand, the two end heads of the L-shaped anti-lateral buckling restraint block 7 are respectively intermittently welded to the inner side face of the limiting guide tube 6. Third, the cross-shaped hole of the first end plate is inserted into the "cross-shaped" support end and is in close contact with the other end face of the limiting guide tube 6 and is firmly welded by butt welding, as Figure 4 shown.

[0051] The composition of the second limiting mechanism is similar to that of the first limiting mechanism above. First, the second stiffening rib is welded in a corner joint form between the two plates at the long end of the connecting section of the second core unit 2 to form an "H-shaped" support end; the anti-lateral buckling restraint blocks 7 are U-shaped, with 2 pieces each; the outer bottom surface of the U-shaped anti-lateral buckling restraint blocks 7 abuts against the outer side surface of the core unit, and the two outer side surfaces of the U-shaped anti-lateral buckling restraint blocks 7 abut against the inner side surface of the core unit. Second, the stiffening ribs 8 rigidly connected to the movable end of the first group of core unit groups are two long strip plates, which are respectively fixed between the two ends of the movable end of the first core unit 1. The limiting blocks 9 are convex platform structures extending outward from the inner ends of the two long strip plates. The second stiffening rib and the U-shaped anti-lateral buckling restraint blocks 7 are inserted into another limiting guide tube 6. On the one hand, one end of the limiting guide tube 6 is tightly attached to the intermediate plate 4 and firmly welded by butt welding. On the other hand, the two ends of the U-shaped anti-lateral buckling restraint blocks 7 are intermittently welded to the inner side surface of the limiting guide tube 6 firmly. Third, the H-shaped hole of the second end plate is inserted into the "H-shaped" support end and tightly attached to the other end surface of the limiting guide tube 6, and firmly welded by butt welding, as Figure 5 shown.

[0052] The working mechanism of the first limiting mechanism: It can be seen from the Figure 1 top view that the first stiffening rib is a long strip plate with a "self - contained boss", and the "boss" is located at the leftmost side of the long strip plate. The distance between the left edge of the "boss" and the intermediate plate 4 is the compression displacement stroke of the first core unit 1; when the left edge of the "boss" of the first stiffening rib contacts and abuts against the outer side surface of the intermediate plate 4, the first stiffening rib plays a role in restricting the compression displacement of the first core unit 1. The distance between the right edge of the "boss" and the first end plate is the tensile displacement stroke of the first core unit 1; when the right edge of the "boss" of the first stiffening rib contacts and abuts against the inner side surface of the first end plate, the first stiffening rib plays a role in restricting the tensile displacement of the first core unit 1.

[0053] The working mechanism of the second limiting mechanism: It can be seen from the Figure 1 top view that the second stiffening rib is a long strip plate, and the limiting block 9 is welded at the right end surface of the long strip plate. The distance between the right edge of the limiting block 9 and the intermediate plate 4 is the compression displacement stroke of the second core unit 2; when the right edge of the limiting block 9 contacts and abuts against the outer side surface of the intermediate plate 4, it plays a role in restricting the compression displacement of the second core unit 2. The distance between the left edge of the limiting block 9 and the second end plate is the tensile displacement stroke of the second core unit 2; when the left edge of the limiting block 9 contacts and abuts against the inner side surface of the second end plate, the first stiffening rib plays a role in restricting the tensile displacement of the second core unit 2.

[0054] Example 4: Buckling restraint displacement amount test

[0055] Conventional traditional structure: Under the working condition of 10 to 30 fatigue units, the displacement of the buckling-restrained brace with a conventional structure is between -30 mm and 30 mm;

[0056] However, for the novel buckling-restrained brace of the present invention, as Figure 14 shown, under the condition of the same shear force, it can achieve a displacement between -60 mm and 60 mm under the working condition of 15 to 60 fatigue units; it can be seen that the novel buckling-restrained brace structure of the present invention can adapt to a greater fatigue degree and deformation displacement.

[0057] The above are only the preferred examples of the present invention, and are not any limitation on the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A buckling-restrained core unit structure with large displacement and high performance, which is installed inside the outer restraint sleeve (3) and extends to both ends, characterized in that, It includes two sets of juxtaposed core units: the first core unit (1) and the second core unit (2). Each set of core unit groups has a fixed end distributed outward and a movable end distributed inward. The fixed ends are respectively fixed to both ends of the outer restraint sleeve. The two sets of core units are installed in a reverse and overlapping manner to form a series-connected force-bearing connection, and the movable end of each set of core unit groups can displace in the compression or tension displacement space provided at the corresponding end of the outer restraint sleeve; The first core unit is a straight plate core material, and the second core unit is two parallel straight plate core materials. The straight plate core material of the first core unit is distributed between the two straight plate core materials of the second core unit.

2. The buckling-restrained core unit structure according to claim 1, wherein, Both sets of core units are dumbbell-shaped plates that are narrow in the middle and wide at both ends, and an isolation layer material is pasted on the surface; each core unit of the two sets of core units is a buckling restraint of the same tonnage with equal specifications and dimensions; or a double-stage yield of different tonnages with different specifications and dimensions.

3. The buckling-restrained core unit structure according to claim 2, wherein, Each core unit of the two sets of core units is respectively of different thicknesses and the same width; or the same thickness and different widths.

4. A buckling-restrained brace with large displacement and high performance, comprising a core unit, a restraint unit and a displacement mechanism unit, characterized in that, Among them: The core unit includes two sets of juxtaposed core unit groups. Each set of core unit groups has a fixed end and a movable end. The restraint unit is an outer restraint sleeve (3). The two sets of core unit groups are placed in the outer restraint sleeve (3) and are respectively fixed to both ends of the outer restraint sleeve (3) at the fixed ends. The two sets of core unit groups are installed in a reverse and overlapping manner to form a series-connected force-bearing connection; The movable end of each set of core unit groups can compress or stretch displace in the displacement mechanism unit provided at the corresponding end of the outer restraint sleeve (3); The first set of core unit groups includes a first core unit (1), and the second set of core unit groups includes two parallelly distributed second core units (2). The first core unit (1) is located in the middle of the two second core units (2).

5. The buckling-restrained brace according to claim 4, characterized in that, The core units of each set of core unit groups are buckling restraints of the same tonnage with equal specifications and dimensions; or double-stage yields of different tonnages with different specifications and dimensions; or Each core unit is respectively of different thicknesses and the same width; or the same thickness and different widths.

6. The buckling-restrained brace according to claim 5, wherein, Each set of core unit groups also includes: an intermediate plate (4) rigidly connected to both ends of the outer restraint sleeve (3). The intermediate plate (4) at each end is rigidly connected to the fixed end of its own set of core unit groups, and rectangular slots (5) corresponding in shape and quantity to the movable ends of the other core units are provided on the intermediate plate (4), so that the movable ends of the first and second core units of the two sets of core unit groups can respectively pass through the intermediate plates (4) on the fixed ends of the other party; The displacement mechanism unit also includes: a limiting mechanism provided behind the intermediate plate (4) of each set of core unit groups, which is used to limit the displacement amount limit of the first set of core unit groups or the second set of core unit groups during compression or tension, to limit lateral instability, and for displacement guidance.

7. The buckling-restrained brace according to claim 5, wherein, The core unit is a straight plate-shaped core material, and the cross-sectional shapes are all cross-shaped, I-shaped or |-shaped; or The cross-sectional shape of the first core unit (1) is I-shaped, and the cross-sectional shape of the second core unit (2) is a horizontally inverted "T" shape.

8. The buckling-restrained brace according to claim 6, wherein The limiting mechanism includes: a limiting guide tube (6), a lateral instability prevention and restraint block (7), a stiffening rib (8), a limiting block (9), and an end plate (10); where: The left and right ends of the limiting guide tube (6) are respectively connected to the end plate (10) and the intermediate plate (4), and the lateral instability prevention and restraint block (7) is installed inside the limiting guide tube (6). The stiffening rib (8) is placed inside the lateral instability prevention and restraint block (7) and is rigidly connected to the movable end of each group of core unit groups respectively. The end plate (10) is provided with a hole groove (11) of a corresponding shape that can allow the stiffening rib (8) and the movable end of the core unit group to pass through the end plate (10). The limiting block (9) is fixedly connected to the inner side end of the stiffening rib (8). Under normal conditions, the limiting block (9) is placed between the end plate (10) and the intermediate plate (4), but the shape of the limiting block (9) prevents it from passing through the end plate (10) and the intermediate plate (4). The displacement distances between the limiting block (9) and the end plate (10) and the intermediate plate (4) respectively are the compression displacement stroke and the tensile displacement stroke of the movable end of each group of core unit groups.

9. The buckling-restrained brace according to claim 8, wherein The lateral instability prevention and restraint block (7) is composed of several pieces and is respectively installed and fixed on the inner wall of the limiting guide tube (6), and a gap of a specific shape is formed between them, so that the gap formed between them can not only meet the requirement that the movable end of the core unit group, the stiffening rib (8), and the limiting block (9) can slide smoothly in the gap along the trend, but also limit and prevent the core unit group from laterally losing stability during displacement. The stiffening rib (8) rigidly connected to the movable end of the second group of core unit groups is a long strip plate, and a limiting block (9) is installed on the inner side end of the long strip plate. The two side surfaces of the long strip plate are fixedly connected between the two movable end heads of the two second core units (2) of the second group of core unit groups. The stiffening rib (8) rigidly connected to the movable end of the first group of core unit groups is two long strip plates, which are respectively fixed between the two sides of the movable end head of the first core unit (1). The limiting block (9) is a convex platform structure extending outward from the inner side ends of the two long strip plates respectively.

10. The buckling-restrained brace according to claim 5, wherein, The lateral instability prevention and restraint block (7) for accommodating the first core unit (1) is a support end structure composed of 4 L-shaped restraint blocks with a cross-shaped gap between them. The lateral instability prevention and restraint block (7) for accommodating the two second core units (2) is a support end structure composed of 4 U-shaped restraint blocks with an H-shaped gap between them.

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