CN215291734U - Large-displacement high-performance buckling constraint core unit structure and support - Google Patents

Abstract

The utility model provides a bucking restraint core unit structure and support of big displacement, high performance relates to the antidetonation technical field, and this bucking restraint of big displacement, high performance supports mainly includes: the device comprises a first group of core unit groups, a second group of core unit groups, an external constraint sleeve and a limiting mechanism; wherein, the core unit group consists of a core unit and a middle plate; the limiting device consists of a limiting guide pipe, a stiffening rib, an end plate and a lateral instability prevention restraint block. The utility model solves the problem that the working displacement of the conventional buckling restrained brace is relatively small by adopting the principle of superposing the working displacement of two groups of core units, and realizes the requirement of large deformation working displacement on the unit length of the buckling restrained brace; on the other hand, the bearing tonnage is designed by adjusting the width and the thickness of the section, and according to the actual engineering requirements, the two groups of core units can be designed into buckling restrained braces with the same tonnage or double-step buckling restrained braces with different tonnage.

Description

Large-displacement high-performance buckling constraint core unit structure and support

Technical Field

The utility model relates to a bucking restraint bearing structure technical field among the building earthquake-resistant technology especially relates to a bucking restraint core unit structure and support of big displacement, high performance.

Background

China is located between the Pacific earthquake zone and the Eurasian earthquake zone, earthquake activities are frequent, and the earthquake-resistant band is one of countries which are seriously affected by earthquake disasters in the world. In order to protect life and property safety to the maximum extent, scholars at home and abroad continuously explore safe, reliable and economic shock absorption measures with good applicability. The buckling restrained brace has double functions of a common brace and a metal damper, the symmetry of the restoring force of tension and compression is basically consistent, a full hysteresis curve is formed, and the buckling restrained brace has better capacity. The buckling restrained brace originates from the 80 th century, along with the large-scale and complicated design of modern building structures, and the requirement on the structural safety is higher and higher, the buckling restrained brace with a conventional structure cannot meet the requirement of special building structures; therefore, more and more novel buckling restrained braces emerge continuously, and the performance and the engineering applicability of the buckling restrained braces are improved through the aspects of structural improvement, new material application and the like. At present, the conventional buckling restrained brace with a single core unit structure cannot meet the performance requirements of a building under a large interlayer displacement angle, particularly the fatigue performance. The core unit of the buckling restrained brace is made of metal, and the fatigue performance of the buckling restrained brace is rapidly reduced along with the increase of the metal deformation, so that the fatigue performance under a larger interlayer displacement angle is expected to be improved by applying a new material, and the improvement is difficult to realize temporarily. Through the structural improvement mode of two core unit series connection, can realize the stack of work displacement volume for when building structure takes place displacement angle between great layer, the support keeps normal work, performance stable power consumption ability.

Disclosure of Invention

In order to overcome the defects and shortcomings of the prior art, the inventor provides the buckling restrained brace of the steel frame or the concrete frame through research and development design, and on one hand, the requirement of displacement with larger deformation in unit length of the buckling restrained brace is met; on the other hand, the dual-core unit can meet the requirement of dual-step yield function.

In order to achieve the above object, the present invention provides the following technical solutions:

a large-displacement high-performance buckling restrained core unit structure is arranged inside an outer restrained sleeve (3) and extends to two ends, and comprises a first group of core units and a second group of core units which are arranged in parallel: the core unit group comprises a first core unit (1) and a second core unit (2), each core unit group is provided with a fixed end and a movable end, the fixed ends are distributed outwards and distributed inwards, the fixed ends are fixed to two ends of an external constraint sleeve respectively, the two core units are distributed and installed in a reverse and overlapped mode to form a serial connection type stress connection, and the movable end of each core unit group can move in a compression or stretching displacement space arranged at the corresponding end of the external constraint sleeve.

Furthermore, the first core unit is a straight plate core material, the second core unit is two parallel straight plate core materials, and the straight plate core materials of the first core unit are distributed between the two straight plate core materials of the second core unit.

Furthermore, the two groups of core units are dumbbell-shaped plates with narrow middle parts and wide two ends, and isolation layer materials are adhered to the surfaces of the dumbbell-shaped plates; each core unit of the two sets of core units is buckling constraint with the same specification, size and the same tonnage; or the double-step yielding with different sizes and dimensions and different tonnages;

each core unit of the two groups of core units has different thicknesses and the same width; or the same thickness, different widths.

The utility model discloses an on the other hand provides a bucking restraint core unit structure and support of big displacement, high performance, including core unit, restraint unit and displacement mechanism unit, wherein: the core unit comprises a first group of core unit groups and a second group of core unit groups which are arranged in parallel, and each group of core unit groups is provided with a fixed end and a movable end; the restraint units are external restraint sleeves, the two groups of core unit groups are arranged in the external restraint sleeves and are respectively fixed with the two ends of the external restraint sleeves at the fixed ends, and the two groups of core unit groups are arranged in a reverse and overlapped manner to form serial stress connection; the movable end of each group of core unit groups can compress displacement or stretch displacement in a displacement mechanism unit arranged at the corresponding end of the external constraint sleeve.

The utility model discloses an appearance is structural, and two sets of core unit are arranged side by side, but is essentially two sets of core unit and passes the intermediate lamella each other, and the rethread external restraint sleeve pipe couples together two sets of core unit series connection. The stress transmission line is as follows: first core element ↔ intermediate plate ↔ outer constraint sleeve ↔ intermediate plate ↔ second core element, thereby realizing superposition of working displacement of first core element and second core element in unit length of buckling restrained brace. The utility model discloses an adjustment core unit's width, thickness and structural style can design for the bucking restraint of the same tonnage and support, or the bucking restraint of the two-step yielding type of different tonnages supports.

The utility model discloses a theory of operation and beneficial effect introduce: the utility model discloses a two sets of core unit arrange side by side, but in essence two sets of core unit pass the intermediate lamella each other, are being connected two sets of core unit series connection through the external restraint sleeve pipe. The stress transmission line is as follows: the first core unit ↔ middle plate ↔ externally restrains the sleeve ↔ middle plate ↔ second core unit, so that the superposition of the working displacement of the first core unit and the second core unit on the unit length of the buckling restrained brace is realized, and the requirement of the buckling restrained brace for large deformation displacement is met. When the two groups of core units are designed to have the same tonnage, under the conditions of small earthquake, medium earthquake or large earthquake, the two groups of core units are in a synchronous working state, and work is realized within the designed maximum displacement range of the limiting device. When the two groups of core units are designed to have different tonnages, under small or medium earthquakes, the first core unit is subjected to plastic deformation, and the second core unit keeps elasticity; along with the increase of earthquake intensity, when the deformation displacement (pulled or pressed) of the first core unit reaches the designed maximum displacement in the process of developing a major earthquake, the first limiting mechanism starts to play a role in limiting the further deformation of the first core unit; and simultaneously, the second core unit gradually starts to enter plastic deformation and works within the designed maximum displacement range of the core unit. The structure is suitable for buildings with concrete structures and steel structures, in particular to an assembled damping building. On one hand, the problem that the working displacement of the conventional buckling restrained brace is relatively small is solved by adopting the principle of superposition of the working displacements of the two groups of core units, and the requirement of large deformation working displacement of the buckling restrained brace in unit length is met; on the other hand, the bearing tonnage is designed by adjusting the width and the thickness of the section, and according to the actual engineering requirements, the two groups of core units can be designed into buckling restrained braces with the same tonnage or double-step buckling restrained braces with different tonnage.

Drawings

FIG. 1 is a perspective front view of the buckling restrained brace of the present invention;

FIG. 2 is a top view of the buckling restrained brace of the present invention;

FIG. 3 is a schematic structural view of a core unit of the buckling restrained brace of the present invention;

fig. 4 is an exploded view of the structure of the components at the movable end of the second core unit group according to the present invention;

fig. 5 is an exploded view of the structure of the components at the movable end of the first core unit group according to the present invention;

FIG. 6 is a perspective view of the buckling restrained brace of the present invention;

FIG. 7 is a front perspective view of the structure of the movable end of the first set of core unit sets (the fixed end of the second set of core unit sets);

FIG. 8 is a perspective top view of the structure of the movable end of the second set of core unit sets (the fixed end of the first set of core unit sets);

FIG. 9 is a front perspective view of the structure of the movable end of the first set of core unit sets (the fixed end of the second set of core unit sets);

FIG. 10 is a perspective top view of the structure of the movable end of the first set of core unit sets (the fixed end of the second set of core unit sets);

fig. 11 is a schematic view of the buckling restrained brace of the present invention in a stretched state;

fig. 12 is a schematic view of the buckling restrained brace of the present invention in a compressed state;

fig. 13 is a schematic view of a three-dimensional structure of the buckling restrained brace of the present invention;

FIG. 14 is a graph showing the experimental results of displacement of a buckling restrained brace of a conventional single-core conventional structure under various fatigue conditions;

fig. 15 is a graph showing the experimental results of the displacement of the buckling restrained brace under various fatigue conditions;

FIGS. 16 to 19 are schematic views of different unit cross-sectional shapes.

Wherein: 1-first core unit, 2-second core unit, 3-external restraint sleeve, 4-intermediate plate, 5-rectangular slotted hole, 6-limiting guide pipe, 7-lateral instability prevention restraint block, 8-stiffening rib, 9-limiting block, 10-end plate and 11-hole groove.

Detailed Description

The technical solution of the buckling restrained brace provided by the present invention will be further described with reference to the following specific embodiments and the accompanying drawings. The advantages and features of the present invention will become more apparent in conjunction with the following description.

It should be noted that the embodiments of the present invention have better practicability, and are not intended to limit the present invention in any form. The technical features or the combinations of the technical features described in the embodiments of the present invention should not be considered as isolated, and they may be combined with each other to achieve a better technical effect. The scope of the preferred embodiments 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 pertain.

The description of the left and right directions mentioned in the following text is described with the viewing direction shown in the drawings of the present invention as a standard; a first limiting mechanism is used for representing a limiting mechanism at the movable end of the first group of core unit groups; the second limiting mechanism represents a limiting mechanism at the movable end of the second group of core unit groups; the first stiffening rib represents a stiffening rib at the movable end of the first group of core unit groups; the second stiffening rib represents a stiffening rib at the movable end of the second group of core unit groups; the second end plate represents an end plate through which the movable end of the second group of core unit groups can pass; the first end plate represents an end plate through which the movable ends of the first group of core unit groups can penetrate.

Example 1: a large-displacement high-performance buckling restrained core unit structure is shown in figures 3, 11 and 12, is arranged inside an outer restrained sleeve and extends to two ends, and comprises a first group of core units and a second group of core units which are arranged in parallel: the outer constraint sleeve comprises a first core unit and a second core unit, each group of core unit groups is provided with a fixed end and a movable end, the fixed ends are distributed outwards and distributed inwards, the fixed ends are fixed with the two ends of the outer constraint sleeve respectively, the two groups of core units are distributed in an inverted and overlapped mode to form a series connection type stress connection, and the movable ends of each group of core unit groups can move in a compression or stretching displacement space arranged at the corresponding end of the outer constraint sleeve. The first core unit is a straight plate core material, the second core unit is two parallel straight plate core materials, and the straight plate core materials of the first core unit are distributed between the two straight plate core materials of the second core unit.

Preferably, the two groups of core units are dumbbell-shaped plates with narrow middle parts and wide two ends, and isolation layer materials are pasted on the surfaces of the dumbbell-shaped plates. Each core unit of the two sets of core units is buckling constraint with the same specification, size and the same tonnage; or the double-step yielding with different sizes and dimensions and different tonnages.

Preferably, each core unit of the two groups of core units has different thicknesses and the same width; or the same thickness, different widths.

Preferably, the cross-sectional shape of the core unit is cross-shaped and is symmetrically distributed along the central axis of the first core unit.

Preferably, as shown in fig. 16 to 19, the first core unit has an i-shaped cross section, and the second core unit has a cross section in the shape of a "T" that is arranged laterally and symmetrically along the central axis of the first core unit group. Through the sectional area of increase core unit to improve the bearing capacity of support, and structural style such as cross, I shape, T font can effectively promote core unit and support holistic stability. Preferably, the cross-sectional shape of the core unit is I-shaped, and the core units are symmetrically distributed along the central axis of the first core unit. And the thickness of the first core unit is larger than that of the second unit, or the height of the first core unit is longer than that of the second unit. Preferably, a displacement limiting structure and a lateral instability prevention constraint structure are arranged behind the fixed end of the core unit, and are used for limiting the displacement limit of the first core unit or the second core unit in compression or stretching and limiting lateral instability.

The core of the embodiment is that displacement superposition which can simultaneously compress or stretch oppositely is realized between two groups of core units which are arranged in parallel. Namely: the stress transmission line among the core units is as follows: the first core unit ↔ is externally constrained by the second core unit of the sleeve ↔, so that the working displacement of the first core unit and the working displacement of the second core unit are superposed on the unit length of the buckling restrained brace, and the function of large deformation displacement of the buckling restrained brace is achieved.

Example 2: general structural overview of buckling restrained brace

A large-displacement and high-performance buckling restrained core unit structure and a support are disclosed, wherein a first group of core unit groups comprises a first core unit 1, a second group of core unit groups comprises two second core units 2 distributed in parallel, and the first core unit 1 is positioned between the two second core units 2; the core units of each group of core unit groups are buckling constraints with the same specification, size and tonnage; or the double-step yielding with different sizes and dimensions and different tonnages; or each core unit has different thickness and same width; or the same thickness, different widths.

The core unit is a straight plate-shaped core material, and the cross section of the core unit can be in a cross shape, an I shape or an I shape; or, the cross-sectional shape of the first core unit 1 may be an i-shape, and the cross-sectional shape of the second core unit 2 may be a "T" shape that is distributed laterally.

Each group of core unit groups further comprises: the middle plate 4 is positioned at two ends of the external restraint sleeve 3 and is rigidly connected with the fixed ends of the core unit groups of each end, the middle plate 4 at each end is rigidly connected with the fixed ends of the core unit groups of each group, and the middle plate 4 is provided with rectangular slotted holes 5 with the shape and the quantity corresponding to the movable ends of the core units of the other group, so that the movable ends of the first core unit and the second core unit of the two groups of core unit groups can respectively and mutually penetrate through the middle plate 4 on the fixed ends of the other group.

The displacement mechanism unit also comprises: and the limiting mechanism is arranged behind the middle plate 4 of each group of core unit groups and is used for limiting the displacement limit of the first group of core unit groups or the second group of core unit groups in compression or stretching, limiting lateral instability and guiding displacement.

In the preferred, stop gear includes: the limiting guide pipe 6, the lateral instability prevention restraint block 7, the stiffening rib 8, the limiting block 9 and the end plate 10 are arranged; wherein: the left end and the right end of the limiting guide pipe 6 are respectively connected to the end plate 10 and the middle plate 4, the lateral instability prevention restraint block 7 is installed in the limiting guide pipe 6, the stiffening ribs 8 are arranged in the lateral instability prevention restraint blocks 7 and are respectively and rigidly connected with the movable end of each group of core unit groups, and the end plate 10 is provided with a hole groove 11 which enables the stiffening ribs 8 and the movable ends of the core unit groups to penetrate through the end plate 10 in a corresponding shape; the limiting block 9 is fixedly connected to the inner side end of the stiffening rib 8, the limiting block 9 is normally arranged between the end plate 10 and the middle plate 4, the limiting block 9 is shaped so as not to penetrate through the end plate 10 and the middle plate 4, and displacement distances between the limiting block 9 and the end plate 10 and between the limiting block 9 and the middle plate 4 are respectively the compression displacement stroke and the stretching displacement stroke of the movable end of each group of core unit groups.

The lateral instability prevention restraint blocks 7 are a plurality of blocks which are respectively installed and fixed on the inner wall of the limiting guide pipe 6, and gaps in specific shapes are formed among the blocks, so that the gaps formed among the blocks can meet the requirement that the movable end, the stiffening rib 8 and the limiting block 9 of the core unit group can slide in the gaps along with guiding and guiding, and can limit and prevent the lateral instability of the core unit group in displacement.

The stress transmission line of the buckling restrained brace is as follows: the first core unit 1 ↔ middle plate 4 ↔ outer constraint sleeve 3 ↔ middle plate 4 ↔ second core unit 2 to realize the superposition of the working displacement of the first core unit 1 and the second core unit 2 on the unit length of the buckling restrained brace, and achieve the function of large deformation displacement of the buckling restrained brace.

Example 3: details of the actual mounting arrangement

As shown in fig. 1, the core unit is a dumbbell-shaped plate with a narrow middle part and wide two ends, wherein the narrow middle part is called a section, the wide two ends are called a connecting section, and the part between the two sections is called a transition section; the connecting section is divided into a long end and a short end according to different lengths. The width and the thickness of the section are determined according to the designed tonnage, and two groups of core units can be designed to be in double-stage yielding with the same tonnage or different tonnage according to the actual engineering requirement; therefore, the first core unit 1 and the second core unit 2 can be designed by using the same specification/model material, as shown in fig. 2; materials of different specifications/models can also be used, as shown in fig. 3. The connecting section needs to ensure the rigidity and stability in the working process and cannot be bent, so the width of the connecting section needs to meet the cross-sectional area/section cross-sectional area of the connecting section with a proper connection consumption area ratio.

The unit has 2 middle plates 4, each middle plate 4 is provided with 3 same groove-shaped through holes, and the length and the width of each groove hole are determined according to the size of a connecting section of the core unit.

The first group of core unit groups are rigidly connected by a plug welding at the back of the groove hole and a fillet welding at the front by a groove hole in the middle of a middle plate 4 penetrated by the short end of the connecting section of the first core unit 1. And in the second group of core unit groups, the short end of the connecting section of the second core unit 2 penetrates through 2 slotted holes on the side edge of the other middle plate 4, and the back surfaces of the slotted holes are rigidly connected by adopting plug welding and fillet welding at the front surface. The surface of the core unit needs to be pasted with an isolation layer material, so that the buckling clearance is reserved, and the friction between the core unit and the filling material is reduced; in order to fully exert the buckling performance, the isolation layer with proper thickness is selected according to the difference of the thickness of the core unit.

The long ends of the connecting sections of the first group of core unit groups and the second group of core unit groups penetrate through the two ends of the external constraint sleeve 3 respectively, then the long ends of the connecting sections of the first group of core unit groups penetrate through the middle slotted hole of the middle plate 4 of the second group of core unit groups, and meanwhile the long ends of the connecting sections of the second group of core unit groups penetrate through the two slotted holes on the side edge of the middle plate 4 of the first group of core unit groups. The inner side surfaces of the middle plates 4 of the two core unit groups are respectively attached to the end surfaces of the outer constraint sleeves 3 and are firmly welded in a butt joint mode. The combination of the core unit and the outer constraint sleeve 3 forms a main body structure of the buckling constraint support. In the main structure, the gap between the inner part of the outer restraining sleeve 3 and the core unit needs to be filled with a compact filling material.

The first limiting mechanism comprises: firstly, a first stiffening rib is welded on the long end of a connecting section of a first core unit 1 in an angle joint mode to form a cross-shaped supporting end part; the lateral instability prevention constraint blocks 7 are L-shaped and are 4 in total; two outer side surfaces of the L shape are respectively attached to the surfaces of the first stiffening rib and the first core unit 1. Secondly, the stiffening ribs 8 rigidly connected with the movable ends of the second group of core unit groups are long-strip plates, the inner side ends of the long-strip plates are provided with limiting blocks 9, and two side surfaces of the long-strip plates are fixedly connected between the movable end parts of the two second core units 2 of the second group of core unit groups; and the first stiffening rib and the L-shaped lateral instability prevention restriction block 7 penetrate into the limiting guide pipe 6, one end of the limiting guide pipe 6 is tightly attached to the middle plate 4 and is firmly welded in a butt joint mode, and two ends of the L-shaped lateral instability prevention restriction block 7 are respectively and firmly welded on the inner side surface of the limiting guide pipe 6 in an intermittent mode. Thirdly, the cross-shaped hole of the first end plate penetrates into the cross-shaped supporting end part and is tightly attached to the other end surface of the limiting guide pipe 6, and butt welding is adopted to be firm, as shown in fig. 4.

The second limiting mechanism is similar to the first limiting mechanism in composition. Firstly, welding a second stiffening rib between two plates at the long end of the connecting section of the second core unit 2 in an angle joint mode to form an H-shaped supporting end part; the lateral instability prevention restraint blocks 7 are U-shaped, and are 2 pieces; the outer bottom surface of the U-shaped lateral instability prevention restraint block 7 is attached to the outer side surface of the core unit, and two outer vertical surfaces of the U-shaped lateral instability prevention restraint block 7 are attached to the inner side surface of the core unit. Secondly, the stiffening ribs 8 rigidly connected with the movable ends of the first core unit group are two long-strip plates and are respectively fixed between two sides of the end of the movable end of the first core unit 1, and the limiting blocks 9 are boss structures respectively extending outwards from the inner ends of the two long-strip plates. And the second stiffening rib and the U-shaped lateral instability prevention restriction block 7 penetrate into the other limiting guide pipe 6, one end of the limiting guide pipe 6 is tightly attached to the middle plate 4 and is firmly welded in a butt joint mode, and two ends of the U-shaped lateral instability prevention restriction block 7 are firmly welded with the inner side face of the limiting guide pipe 6 intermittently. Thirdly, the H-shaped hole of the second end plate is penetrated into the H-shaped supporting end part and is tightly attached to the other end surface of the limiting guide pipe 6, and the butt welding is adopted for fixing, as shown in figure 5.

The working mechanism of the first limiting mechanism is as follows: as can be seen from the top view of fig. 1, the first stiffener is an elongated plate with a "boss" located on the leftmost side of the elongated plate. The distance between the left edge of the boss and the middle 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 is tightly propped against the outer side surface of the middle plate 4, the first stiffening rib plays a role in limiting 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 stretching 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 limiting the stretching displacement of the first core unit 1.

The working mechanism of the second limiting mechanism is as follows: as can be seen from the top view of fig. 1, the second stiffening rib is a long plate, and a limiting block 9 is welded on the right end face of the long plate. The distance between the right edge of the limiting block 9 and the middle plate 4 is the compression displacement stroke of the second core unit 2; when the right edge of the limiting block 9 is tightly contacted and supported with the outer side surface of the middle plate 4, the effect of limiting the compression displacement of the second core unit 2 is achieved. The distance between the left edge of the limiting block 9 and the second end plate is the stretching displacement stroke of the second core unit 2; when the left edge of the limiting block 9 is tightly contacted and jacked with the inner side surface of the second end plate, the first stiffening rib plays a role in limiting the stretching displacement of the second core unit 2.

Example 4: buckling restrained displacement test

The conventional structure is as follows: as shown in FIG. 14, under the working condition of 10-30 fatigue units, the displacement of the buckling restrained brace with the conventional structure is-30 mm;

the novel buckling restrained brace of the utility model can realize displacement between-60 mm and 60mm under the working condition of 15 to 60 fatigue units under the condition of the same shearing force as shown in figure 15; it is visible, the utility model discloses a novel bucking restraint bearing structure can adapt to bigger fatigue degree and deformation displacement volume.

The above description is only a preferred example of the present invention, and is not intended to limit the scope of the present invention, and all modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a big displacement, high performance's bucking restraint core unit structure, installs and extends to both ends in outer restraint sleeve pipe (3) is inside, its characterized in that includes first, the second two sets of core unit that arrange side by side: the core unit group comprises a first core unit (1) and a second core unit (2), each core unit group is provided with a fixed end and a movable end, the fixed ends are distributed outwards and distributed inwards, the fixed ends are fixed to two ends of an external constraint sleeve respectively, the two core units are distributed and installed in a reverse and overlapped mode to form a serial connection type stress connection, and the movable end of each core unit group can move in a compression or stretching displacement space arranged at the corresponding end of the external constraint sleeve.

2. The buckling-restrained core cell structure of claim 1, wherein the first core cell is a straight panel core and the second core cell is two parallel straight panel cores, the straight panel cores of the first core cell being distributed between the two straight panel cores of the second core cell.

3. The buckling-restrained core unit structure according to claim 2, wherein both sets of core units are dumbbell-shaped plates with narrow middle parts and wide two ends, and isolation layer materials are adhered to the surfaces of the dumbbell-shaped plates; each core unit of the two sets of core units is buckling constraint with the same specification, size and the same tonnage; or the double-step yielding with different sizes and dimensions and different tonnages;

each core unit of the two groups of core units has different thicknesses and the same width; or the same thickness, different widths.

4. A large displacement, high performance buckling restrained brace, includes core element, restraint unit and displacement mechanism unit, its characterized in that, wherein:

the core unit comprises a first group of core unit groups and a second group of core unit groups which are arranged in parallel, each group of core unit groups is provided with a fixed end and a movable end,

the restraint units are external restraint sleeves (3), the two groups of core unit groups are arranged in the external restraint sleeves (3) and are respectively fixed with the two ends of the external restraint sleeves (3) at the fixed ends, and the two groups of core unit groups are arranged in an inverted and overlapped manner to form serial stress connection;

the movable end of each group of core unit groups can be compressed or stretched in a displacement mechanism unit arranged at the corresponding end of the external constraint sleeve (3).

5. The buckling-restrained brace according to claim 4, wherein the first group of core unit groups comprises a first core unit (1), the second group of core unit groups comprises two second core units (2) distributed in parallel, and the first core unit (1) is located between the two second core units (2);

the core units of each group of core unit groups are buckling constraints with the same specification, size and tonnage; or the double-step yielding with different sizes and dimensions and different tonnages; or

Each core unit has different thickness and same width; or the same thickness, different widths.

6. The buckling-restrained brace of claim 5, wherein the core unit is a straight-plate-shaped core material, and the cross-sectional shape is cross-shaped, I-shaped or | shaped; or

The cross section of the first core unit (1) is I-shaped, and the cross section of the second core unit (2) is T-shaped and is distributed transversely.

7. The buckling-restrained brace of claim 5, wherein each set of core cell groups further comprises: the middle plates (4) are positioned at two ends of the external constraint sleeve (3) and are in rigid connection, the middle plate (4) at each end is in rigid connection with the fixed ends of the core unit groups of each group, and the middle plates (4) are respectively provided with rectangular slotted holes (5) with the shapes and the numbers corresponding to the movable ends of the core units of the other group, so that the movable ends of the first core unit and the second core unit of the two groups of core unit groups can respectively and mutually penetrate through the middle plates (4) on the fixed ends of the other group;

the displacement mechanism unit further comprises: and the limiting mechanism is arranged behind the middle plate (4) of each group of core unit groups and is used for limiting the displacement limit of the first group of core unit groups or the second group of core unit groups in compression or stretching, limiting lateral instability and guiding displacement.

8. The buckling-restrained brace of claim 7, wherein the limiting mechanism comprises: the device comprises a limiting guide pipe (6), a lateral instability prevention constraint block (7), a stiffening rib (8), a limiting block (9) and an end plate (10); wherein:

the left end and the right end of the limiting guide pipe (6) are respectively connected to the end plate (10) and the middle plate (4), the lateral instability prevention restraint block (7) is arranged in the limiting guide pipe (6),

the stiffening ribs (8) are arranged in the lateral instability prevention restraint blocks (7) and are respectively and rigidly connected with the movable end of each group of core unit group,

the end plate (10) is provided with a hole groove (11) which can enable the stiffening rib (8) and the movable end of the core unit group to penetrate through the end plate (10) in a corresponding shape;

the limiting block (9) is fixedly connected to the inner side end of the stiffening rib (8), the limiting block (9) is normally arranged between the end plate (10) and the middle plate (4), but the shape of the limiting block (9) prevents the limiting block from penetrating through the end plate (10) and the middle plate (4),

and the displacement distance between the limiting block (9) and the end plate (10) and the middle plate (4) is the compression displacement stroke and the stretching displacement stroke of the movable end of each group of core unit group.

9. The buckling restrained brace according to claim 8, wherein the lateral instability prevention restraining blocks (7) are respectively installed and fixed on the inner wall of the limiting guide pipe (6) in a plurality of blocks, and form a gap with a specific shape between the limiting guide pipe and the limiting block, so that the gap formed between the limiting guide pipe and the limiting block 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 smoothly guide and slide in the gap, but also limit and prevent the lateral instability of the core unit group in displacement;

the stiffening ribs (8) rigidly connected with the movable ends of the second group of core unit groups are long-strip plates, the inner side ends of the long-strip plates are provided with limiting blocks (9), and two side surfaces of each long-strip plate are fixedly connected between the movable end parts of the two second core units (2) of the second group of core unit groups;

the stiffening ribs (8) rigidly connected with the movable ends of the first group of core unit groups are two strip plates and are respectively fixed between two sides of the end of the movable end of the first core unit (1), and the limiting blocks (9) are boss structures respectively extending outwards from the inner ends of the two strip plates.

10. The buckling-restrained brace according to claim 5, wherein the lateral-instability-prevention restraining block (7) for accommodating the first core unit (1) is a bracing end structure consisting of 4L-shaped restraining blocks with a cross-shaped mutual gap;

the lateral instability prevention restraint block (7) used for accommodating the two second core units (2) is a supporting end structure which is formed by 4U-shaped restraint blocks and has an H-shaped mutual gap.

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