Shape memory alloy plate buckling restrained brace with friction energy consumption and using method

Abstract

The invention relates to a shape memory alloy plate buckling restrained brace with friction energy dissipation and a using method. The buckling restrained brace comprises a core plate, stiffening plates arranged at the two ends of the core plate, buckling restrained cover plates arranged on the upper side and the lower side of the core plate, angle steel used for connecting the stiffening plates and the buckling restrained cover plates, and filling plates arranged between the core plate and the buckling restrained cover plates. The core plate is an iron-based shape memory alloy plate and can recover deformation caused by earthquake load under local heating; long slotted holes are formed in the stiffening plates, the buckling constraint cover plates and the angle steel, the stiffening plates and the angle steel are connected through bolt assemblies, the buckling constraint cover plates and the angle steel are connected through bolt assemblies, the filling plates and the buckling constraint cover plates on the two sides are connected through bolt assemblies, and energy is consumed between the bolt assemblies and the long slotted holes through friction. Compared with the prior art, the buckling restrained brace can be used as a lateral force resistance and energy consumption component of a steel frame structure, and has the advantages of being easy to reset, high in energy consumption, easy to assemble and disassemble and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of building shock absorption, and in particular to a buckling restraint support of a shape memory alloy plate with friction energy dissipation and a use method thereof. Background Art

[0002] Buckling-restrained braces typically consist of an energy-dissipating core, buckling-restraining members, and a filler material between the two. The core, typically low-yield steel, is designed to dissipate seismic energy by axially expanding and contracting during earthquakes. Because the core's buckling is restrained by the filler and surrounding members, it exhibits significantly superior energy dissipation capabilities compared to traditional braces.

[0003] With the advancement of structural seismic research, buckling-restrained braces are gradually replacing traditional braces, and their seismic performance has been verified in numerous experimental studies and engineering cases. Numerous different forms of buckling-restrained braces exist, based on varying core panel construction, filler material types, and dimensional designs. For example, core panel cross-sections can range from straight, cross, and I-shaped. In the longitudinal direction, core panel configurations can be broadly categorized as dogbone, perforated, and fishbone.

[0004] With the increasing adoption of prefabricated structures, all-steel prefabricated buckling-restrained structures are gaining popularity. This bolted joint not only reduces the size and mass of components but, more importantly, reduces construction time and replacement costs. To improve urban resilience and enhance the rapid post-earthquake recovery of structures, self-resetting buckling-restrained braces have emerged and are becoming a mainstream research topic. These self-resetting buckling-restrained braces incorporate prestressed components, such as tendons and cables, into existing energy-absorbing components, leveraging prestress to achieve self-resetting.

[0005] However, the introduction of prestressing often puts forward more stringent requirements on anchors, and the application of prestressing itself also causes construction difficulties. The independence between prestressed components and energy-consuming components also increases the complexity of construction. All these factors make the self-resetting buckling restrained support generally have the problem of high threshold for engineering application. CN108999455A discloses an easy-to-reset high-energy-consuming buckling restrained support. The buckling restrained support adopts the coordinated cooperation of steel plates and shape memory alloy plates. Through the self-resetting energy-consuming mechanism and the shell mechanism, the weakened area, anchoring area and transition area of ​​the steel core plate and the shape memory alloy core plate are utilized, combined with the bonding-free material and bolt connection, it is possible to achieve the recovery of most of the residual deformation after the earthquake. However, the buckling restrained support uses the sliding between the self-resetting energy-consuming mechanism and the shell mechanism to consume energy. There are problems such as uneven friction coefficient along the entire length and unstable friction force. It is impossible to provide the same friction energy consumption capacity under the two different stress states of tension and compression of the buckling restrained support, resulting in the problem of unequal bidirectional seismic performance. In addition, the buckling restrained support cannot be self-reset and repaired without disassembly after the earthquake, which further increases the reset cost.

[0006] Therefore, in order to achieve rapid recovery of post-earthquake functions and improve the seismic resilience of building structures, a new type of buckling-restrained support with both self-reset and high energy dissipation properties still needs to be developed. Summary of the Invention

[0007] The purpose of the present invention is to provide a shape memory alloy plate buckling restraint support with friction energy dissipation and a method of use in order to solve at least one problem existing in the prior art.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] The present invention first provides a buckling restraint support of a shape memory alloy plate with friction energy dissipation, the buckling restraint support comprising a core plate, stiffening plates provided at both ends of the core plate, buckling restraint cover plates provided at the upper and lower sides of the core plate, angle steels for connecting the stiffening plates and the buckling restraint cover plates, and filler plates provided between the core plate and the buckling restraint cover plates;

[0010] The core plate is an iron-based shape memory alloy plate, which can recover the deformation caused by seismic loads under local heating at 150-400°C;

[0011] The stiffening plate, buckling restraint cover plate and angle steel are all provided with long slots. The stiffening plate and the angle steel, the buckling restraint cover plate and the angle steel, and the filling plate and the buckling restraint cover plates on both sides are all connected by bolt assemblies, and friction dissipates energy between the bolt assemblies and the long slots.

[0012] Furthermore, the core plate is dog-bone shaped as a whole, comprising a reduced section and anchoring sections symmetrically arranged at both ends of the reduced section. The dog-bone core plate with a straight cross section has a simple structure, is easy to industrialize, and has good energy dissipation capacity.

[0013] Furthermore, there is an arc-shaped transition section between the reduction section and the anchoring section, and the stiffening plate is welded to the anchoring section of the core plate.

[0014] Furthermore, the buckling restraining cover plate can completely cover the reduced section and transition section of the core plate.

[0015] Furthermore, the thickness of the filling plate is consistent with that of the core plate, the curvature of both ends of the filling plate is consistent with the curvature of the transition section of the core plate, and there is no gap between the edge of the filling plate and the edge of the core plate.

[0016] Furthermore, the buckling restraint cover plates are symmetrically and tightly adhered to the upper and lower surfaces of the core plate along the thickness direction by means of structural adhesive.

[0017] Furthermore, the buckling restraint cover plate and the filling plate are both provided with a plurality of bolt holes along the length direction, and the bolt holes of the two correspond to each other one by one.

[0018] Furthermore, the buckling restraint cover plate is made of GFRP (glass reinforced plastic).

[0019] Furthermore, the angle steels are symmetrically arranged with respect to the stiffening plates in the horizontal direction and symmetrically arranged with respect to the core plates in the vertical direction.

[0020] Furthermore, both ends of the buckling restraint cover plate are provided with snap-in grooves adapted to the stiffening plates.

[0021] Furthermore, the stiffening plate is provided with a first long slot hole, the buckling restraint cover plate is provided with at least one second long slot hole on both sides of the clamping slot, and the two limbs of the angle steel are respectively provided with a third long slot hole and a fourth long slot hole.

[0022] Furthermore, the first long slot hole is aligned with the third long slot hole, and the second long slot hole is aligned with the fourth long slot hole, and the bolt assembly can dissipate energy through friction with the above-mentioned long slot holes.

[0023] Furthermore, the length of the long side of the long slot hole is not less than twice the diameter of the bolt in the bolt assembly.

[0024] Furthermore, the bolt assembly includes the bolt connection pair and a disc spring, wherein the bolt connection pair includes a bolt, a nut and a washer.

[0025] Furthermore, a gasket is provided between the head of the bolt and the nut and the connected member, and a disc spring is provided between the gasket and the connected member.

[0026] Iron-based shape memory alloys are a class of alloys that exhibit a shape memory effect. The shape memory effect refers to the ability of iron-based shape memory alloys to memorize their shape at room temperature and, after deformation, to recover their original shape by heating to a specific temperature range. If the deformation of the iron-based shape memory alloy is restricted during the shape recovery process, its shape memory effect can be converted into restoring stress and transmitted to the connected components through a reliable connection. The shape memory effect of iron-based shape memory alloys eliminates the need for large equipment such as hydraulic jacks to apply prestress, saving significant manpower and material resources. The alloy is expected to find applications in fatigue crack repair of steel structures and bending reinforcement of steel beams.

[0027] However, iron-based shape memory alloys are currently used only as reinforcement components, and there is still room for extensive development and application in building structures, especially in earthquake resistance. Based on this, the present invention innovatively uses iron-based shape memory alloys as prestressed components, fully leveraging their ease of prestressing. This is expected to improve the complex construction and construction difficulties of existing earthquake-resistant components, enhance their constructability, load-bearing capacity, and disaster-resistance, and reduce the costs of production, operation, maintenance, and post-disaster repair of the structures.

[0028] The working principle of the buckling restrained brace of the present invention is:

[0029] The iron-based shape memory alloy core plate undergoes axial expansion and contraction deformation under seismic loads. The buckling restraint cover plate and infill plate are bolted to the iron-based shape memory alloy core plate. Angle steel is bolted through slotted holes to connect the buckling restraint cover plate to the iron-based shape memory alloy core plate and iron-based shape memory alloy stiffener plate. This prevents axial loads on the buckling restraint cover plate while allowing for relative movement between the iron-based shape memory alloy core plate, stiffener plate, buckling restraint cover plate, and angle steel, thereby increasing the core plate's deformation energy dissipation capacity and generating additional frictional energy dissipation.

[0030] When the iron-based shape memory alloy core plate is stretched, the disc springs provide a compressive force on the buckling restraint cover plate, preventing a gap from forming between the iron-based shape memory alloy core plate and the buckling restraint cover plate. When the iron-based shape memory alloy core plate is compressed, the disc springs provide deformation space for the lateral expansion of the iron-based shape memory alloy core plate, preventing the buckling restraint cover plate from bending and damaging, thereby fully utilizing its energy dissipation capacity.

[0031] The present invention also provides a method for using a shape memory alloy plate buckling restraint support with friction energy dissipation, comprising:

[0032] Under minor earthquake conditions, the buckling restrained brace is in the elastic stage and does not require repair;

[0033] Under moderate earthquake conditions, the surface of the buckling restraint support is provided with an electromagnetic coil for locally heating the buckling restraint support to achieve self-reset;

[0034] Under severe earthquake conditions, the bolt assemblies of the buckling restraint supports are dismantled and the damaged components are replaced.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The buckling restraint brace of the shape memory alloy plate with friction energy dissipation of the present invention is based on a core plate with shape memory effect, and is combined with a stiffening plate, a buckling restraint cover plate, angle steel, and a filler plate to form a buckling restraint brace structure with good seismic performance, which can be used as a lateral force resistance and energy dissipation component of a steel frame structure. In addition, the buckling restraint brace of the present invention can achieve self-reset of the iron-based shape memory alloy core plate by heating, and can recover the deformation caused by seismic load without disassembly or damage to the overall structure; the buckling restraint brace of the shape memory alloy plate with friction energy dissipation of the present invention can further dissipate energy through friction and sliding between the long slot hole and the bolt assembly, further enhancing the seismic energy dissipation performance of the structure under moderate and large earthquakes.

[0037] (2) The buckling restraint brace of the shape memory alloy plate with friction energy dissipation of the present invention can dissipate energy through friction and slip between the long slotted hole and the bolt assembly, thereby reducing the plastic deformation damage of the connected plates, so that the buckling restraint brace has excellent deformation capacity and a controllable deformation range. Therefore, the buckling restraint brace of the present invention can further realize the combined energy dissipation effect of the axial deformation and friction and slip of the iron-based shape memory alloy plate, so that the buckling restraint brace of the present invention can be used as both a lateral force resisting member and an energy dissipating member of the steel frame, so as to achieve rapid recovery of post-earthquake function and improve the seismic toughness of the structure.

[0038] (3) The buckling restraint support of the shape memory alloy plate with friction energy dissipation of the present invention uses disc springs to ensure that the bolts do not loosen under seismic loads, and can achieve the performance design goals of intact elasticity in small earthquakes, self-reset of the core plate activated by medium earthquakes, and in-situ replacement of the core plate in large earthquakes. When the iron-based shape memory alloy core plate is stretched, the disc springs can provide a pressing force to the buckling restraint cover plate, avoiding the gap between the iron-based shape memory alloy core plate and the buckling restraint cover plate, which may cause the plate to dislocate; when the iron-based shape memory alloy core plate is compressed, the disc springs provide deformation space for the lateral expansion of the core plate, preventing the buckling restraint cover plate from being damaged by bending, thereby giving full play to the energy dissipation capacity of the core plate.

[0039] (4) The two ends of the buckling restraint support of the shape memory alloy plate with friction energy dissipation of the present invention are reinforced and fixed by stiffening plates, angle steels, bolts, etc., providing additional constraints for the transition section of the buckling restraint support, ensuring that the transition section not covered by the buckling restraint cover plate does not suffer any form of damage. The long slot holes opened can simultaneously provide friction and constrain the stroke. Different from the energy dissipation method of mutual friction between core plates adopted in the prior art, the present invention uses the friction between angle steels, buckling restraint cover plates, and stiffening plates as the main source of friction, solving the problem of different friction forces when the support is under tension and compression, and the application of disc spring gaskets ensures the stability of the friction coefficient throughout the process, improving the uneven friction coefficient in the prior art.

[0040] (5) The buckling-restrained brace of the shape memory alloy plate with frictional energy dissipation of the present invention is assembled using a fully bolted connection, resulting in a simple and clear force transmission path. It is also convenient to design, install, and disassemble, enabling industrialized mass production and suitable for in-situ replacement during major earthquakes. Furthermore, the buckling-restrained brace of the present invention is compatible with the construction methods of steel structures and is relatively small, thus reducing the space occupied in buildings.

[0041] (6) The buckling restraint support of the shape memory alloy plate with friction energy dissipation of the present invention has all components in the elastic lossless range under small earthquake conditions, and no human intervention is required for repair; under medium earthquake conditions, the deformation of the iron-based shape memory alloy core plate can be activated and restored by electromagnetic heating, thereby realizing the self-resetting function; under large earthquake conditions, the buckling restraint support of the shape memory alloy plate with friction energy dissipation has excellent deformation and energy dissipation capabilities, ensuring the seismic performance of the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of the shape memory alloy plate buckling restraint support of the present invention.

[0043] Figure 2 It is a front view of the shape memory alloy plate buckling restraint support of the present invention.

[0044] Figure 3 It is a top view of the shape memory alloy plate buckling restraint support of the present invention.

[0045] Figure 4 It is a side view of the shape memory alloy plate buckling restraint support of the present invention.

[0046] Figure 5 Schematic diagram of the exploded view of the buckling restraint support of the shape memory alloy plate of the present invention.

[0047] Figure 6 It is a structural schematic diagram of the core plate, stiffening plate and angle steel of the present invention.

[0048] Figure 7 It is a structural schematic diagram of the buckling restraint cover plate and the filling plate of the present invention.

[0049] Figure 8 It is a partial schematic diagram of the connection between the bolt assembly and the angle steel of the present invention.

[0050] Figure 9 It is a structural schematic diagram of the bolt assembly of the present invention.

[0051] Figure 10 This is a schematic diagram of the buckling restrained support of the shape memory alloy plate of the present invention under electromagnetic heating.

[0052] Description of the marks in the figure:

[0053] 1-core plate, 11-reduction section, 12-anchoring section, 13-transition section;

[0054] 2-stiffening plate, 21-first long slot;

[0055] 3-buckling restraint cover plate, 31-clamping groove, 32-second long slot;

[0056] 4-angle steel, 41-third long slot hole, 42-fourth long slot hole;

[0057] 5-filling plate;

[0058] 6-bolt assembly, 61-bolt, 62-nut, 63-washer, 64-disc spring;

[0059] 7- Electromagnetic coil. DETAILED DESCRIPTION

[0060] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0061] In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0063] To achieve the seismic design goals of no damage in minor earthquakes, self-resettable core plates activated by moderate earthquakes, and in-situ core plate replacement in major earthquakes, and to achieve rapid post-earthquake functional recovery and improve the seismic toughness of the structure, the present invention provides a buckling-restrained brace with a shape memory alloy plate with frictional energy dissipation. This buckling-restrained brace features convenient construction, excellent seismic performance, and post-earthquake recovery, and can be used as a lateral force-resisting and energy-dissipating component in steel frame structures.

[0064] The first aspect of the present invention provides a shape memory alloy plate buckling restraint support with friction energy dissipation. The buckling restraint support of the present invention comprises a core plate 1, stiffening plates 2 provided at both ends of the core plate 1, buckling restraint cover plates 3 provided on the upper and lower sides of the core plate 1, angle steels 4 for connecting the stiffening plates 2 and the buckling restraint cover plates 3, and a filler plate 5 provided between the core plate 1 and the buckling restraint cover plates 3; the core plate 1 is an iron-based shape memory alloy plate that can recover the deformation caused by seismic loads under local heating at 150-400°C; the stiffening plates 2, the buckling restraint cover plates and the angle steel 4 are all provided with long slots, and the stiffening plates 2 and the angle steel 4, the buckling restraint cover plates 3 and the angle steel 4, and the filler plate 5 and the buckling restraint cover plates 3 on both sides are all connected by bolt assemblies 6, and friction energy dissipation is achieved between the bolt assemblies 6 and the long slots.

[0065] In some specific embodiments, the core plate 1 is dog-bone shaped as a whole, and includes a reduction section 11 and anchoring sections 12 symmetrically arranged at both ends of the reduction section 11. A circular arc-shaped transition section 13 is formed between the reduction section 11 and the anchoring section 12, and the stiffening plate 2 is welded to the anchoring section 12 of the core plate 1.

[0066] In some more specific embodiments, the buckling restraining cover plate 3 can completely cover the reduced section 11 and the transition section 13 of the core panel 1 .

[0067] In some more specific embodiments, the thickness of the filling plate 5 is consistent with that of the core plate 1 , the curvature of both ends of the filling plate 5 is consistent with that of the transition section 13 of the core plate 1 , and there is no gap between the edge of the filling plate 5 and the edge of the core plate 1 .

[0068] In some specific embodiments, the buckling restraining cover plates 3 are symmetrically and tightly adhered to the upper and lower surfaces of the core plate 1 along the thickness direction by means of structural adhesive.

[0069] In some specific embodiments, the buckling restraining cover plate 3 and the filling plate 5 are both provided with a plurality of bolt holes along the length direction, and the bolt holes of the two correspond to each other one by one.

[0070] In some specific embodiments, the angle steels 4 are symmetrically arranged with respect to the stiffening plate 2 in the horizontal direction and symmetrically arranged with respect to the core plate 1 in the vertical direction.

[0071] In some specific embodiments, both ends of the buckling restraint cover plate 3 are provided with snap-in grooves 31 adapted to the stiffening plate 2 .

[0072] In some specific embodiments, the stiffening plate 2 is provided with a first long slot hole 21, the flexure restraint cover plate 3 is provided with at least one second long slot hole 32 on both sides of the clamping slot 31, and the two limbs of the angle steel 4 are respectively provided with a third long slot hole 41 and a fourth long slot hole 42.

[0073] In some specific embodiments, the first long slot hole 21 is aligned with the third long slot hole 41 , and the second long slot hole 32 is aligned with the fourth long slot hole 42 , and the bolt assembly 6 can dissipate energy through friction with the above-mentioned long slot holes.

[0074] In some specific embodiments, the length of the long side of the long slotted hole is not less than twice the diameter of the bolt 61 in the bolt assembly 6 .

[0075] In some specific embodiments, the bolt assembly 6 includes the bolt connection pair and a disc spring 64 , wherein the bolt connection pair includes a bolt 61 , a nut 62 and a washer 63 .

[0076] In some more specific embodiments, a washer 63 is provided between the head of the bolt 61 and the nut 62 and the connected member, and a disc spring 64 is provided between the washer 63 and the connected member.

[0077] The second aspect of the present invention provides a method for using a buckling restraint support with a shape memory alloy plate with frictional energy dissipation, with the goal of preventing damage in small earthquakes, activating the core plate 1 to reset without disassembly in medium earthquakes, and allowing in-situ replacement of the core plate 1 in large earthquakes. Specifically, the method includes:

[0078] Under minor earthquake conditions, the buckling restrained brace is in the elastic stage and does not require repair;

[0079] Under moderate earthquake conditions, the surface of the buckling restraint support is provided with an electromagnetic coil 7 for locally heating the buckling restraint support to achieve self-reset;

[0080] Under a major earthquake condition, the bolt assembly 6 of the buckling restraint support is disassembled and the damaged component is replaced.

[0081] The above embodiments can be implemented individually or in any combination of two or more. The above embodiments will be described in more detail below with reference to specific examples.

[0082] Example 1:

[0083] This embodiment provides a buckling restraint support for a shape memory alloy plate with friction energy dissipation. Figure 1 As shown, the buckling restraint brace of this embodiment includes a core plate 1 , a stiffening plate 2 , a buckling restraint cover plate 3 , angle steels 4 , a filler plate 5 and a bolt assembly 6 .

[0084] In this embodiment, the stiffening plates 2 are arranged at both ends of the core plate 1, the buckling restraint cover plates 3 are arranged on the upper and lower sides of the core plate 1, the angle steel 4 is used to connect the stiffening plates 2 and the buckling restraint cover plates 3, and the filling plates 5 are arranged between the core plate 1 and the buckling restraint cover plates 3.

[0085] The core plate 1 of this embodiment is an iron-based shape memory alloy plate, which can recover the deformation caused by earthquake load under local heating at 150-400°C.

[0086] In this embodiment, long slots are provided on the stiffening plate 2, the buckling restraint cover plate and the angle steel 4. The stiffening plate 2 and the angle steel 4, the buckling restraint cover plate 3 and the angle steel 4, and the filling plate 5 and the buckling restraint cover plates 3 on both sides are connected by bolt assemblies 6, and energy is dissipated through friction between the bolt assemblies 6 and the long slots.

[0087] The specific method of using the buckling restrained support of the shape memory alloy plate with friction energy dissipation in different earthquake conditions is as follows:

[0088] (1) Under small earthquake conditions, the buckling restrained brace is in the elastic stage and does not require repair.

[0089] (2) Under moderate earthquake conditions, an electromagnetic coil 7 is arranged on the surface of the buckling restraint support to locally heat the buckling restraint support to achieve self-reset.

[0090] (3) Under a major earthquake condition, the bolt assembly 6 of the buckling restraint support is disassembled and the damaged component is replaced.

[0091] The buckling-restrained brace with frictional energy dissipation, comprising a core plate 1 with a shape memory effect, is constructed with stiffening plates 2, buckling-restrained cover plates 3, angle steel 4, and infill plates 5 to form a buckling-restrained brace structure with excellent seismic performance. The iron-based shape memory alloy core plate 1 can be self-reset by heating, allowing deformation caused by seismic loads to be restored without disassembly or damage to the overall structure. Furthermore, the buckling-restrained brace with frictional energy dissipation, achieved through frictional sliding between the slotted holes and the bolt assembly 6, further enhances the structure's seismic energy dissipation performance under moderate and severe earthquakes.

[0092] Example 2:

[0093] This embodiment provides a buckling restraint brace of a shape memory alloy plate with friction energy dissipation, which comprises a core plate 1 , a stiffening plate 2 , a buckling restraint cover plate 3 , an angle steel 4 , a filler plate 5 and a bolt assembly 6 .

[0094] The difference from Example 1 is that the core plate 1 of this embodiment is dog-bone shaped as a whole, specifically comprising a reduction section 11 and anchoring sections 12 symmetrically arranged at both ends of the reduction section 11. A circular arc-shaped transition section 13 is formed between the reduction section 11 and the anchoring section 12, and the stiffening plate 2 is welded to the anchoring section 12 of the core plate 1.

[0095] The buckling restraining cover plate 3 of this embodiment can completely cover the reduced section 11 and transition section 13 of the core plate 1 .

[0096] The thickness of the filling plate 5 of this embodiment is consistent with that of the core plate 1, and the curvature of the two ends of the filling plate 5 is consistent with the curvature of the transition section 13 of the core plate 1. There is no gap between the edge of the filling plate 5 and the edge of the core plate 1, that is, the filling plate 5 and the dog-bone-shaped core plate 1 can be tightly spliced ​​into a complete square in the horizontal direction, which can effectively restrain the in-plane buckling of the core plate 1.

[0097] Example 3:

[0098] This embodiment provides a buckling restraint brace of a shape memory alloy plate with friction energy dissipation, which comprises a core plate 1 , a stiffening plate 2 , a buckling restraint cover plate 3 , an angle steel 4 , a filler plate 5 and a bolt assembly 6 .

[0099] The difference from Example 1 is that the buckling restrained cover plate 3 of this embodiment is a GFRP (glass reinforced plastic) buckling restrained cover plate, which is tightly adhered to the upper and lower surfaces of the core plate 1 along the thickness direction by structural adhesive.

[0100] The GFRP buckling restrained cover plate used in this embodiment has excellent properties such as corrosion resistance, high strength, light weight, and fire resistance. The combination of the GFRP buckling restrained cover plate and the structural adhesive in this embodiment can increase the overall tensile stiffness of the buckling restrained support by more than 5%.

[0101] In this embodiment, the buckling restraining cover plate 3 and the filling plate 5 are both provided with a plurality of standard circular bolt holes along the length direction, and the bolt holes of the two correspond one to one, so as to facilitate the corresponding bolt connection of the bolt assembly 6.

[0102] In this embodiment, the angle steels 4 are symmetrically arranged with respect to the stiffening plate 2 in the horizontal direction and symmetrically arranged with respect to the core plate 1 in the vertical direction, that is, four angle steels are arranged at both ends of the core plate 1 .

[0103] Example 4:

[0104] This embodiment provides a buckling restraint brace of a shape memory alloy plate with friction energy dissipation, which comprises a core plate 1 , a stiffening plate 2 , a buckling restraint cover plate 3 , an angle steel 4 , a filler plate 5 and a bolt assembly 6 .

[0105] The difference from the first embodiment is that the buckling restraining cover plate 3 of this embodiment is provided with engaging grooves 31 adapted to the stiffening plate 2 at both ends.

[0106] In this embodiment, the stiffening plate 2 is provided with a first slotted hole 21. The buckling restraining cover plate 3 is provided with at least one second slotted hole 32 on either side of the engaging slot 31. A third slotted hole 41 and a fourth slotted hole 42 are provided at each leg of the angle steel 4. The first slotted hole 21 is aligned with the third slotted hole 41, and the second slotted hole 32 is aligned with the fourth slotted hole 42. The bolt assembly 6 dissipates energy through friction with these slotted holes.

[0107] The bolt assembly 6 of this embodiment comprises the aforementioned bolt connection pair and a disc spring 64. The bolt connection pair comprises a bolt 61, a nut 62, and a washer 63. A washer 63 is positioned between the hexagonal head of the bolt 61 and the nut 62, and the connected component. The disc spring 64 is positioned between the washer 63 and the connected component. The disc spring 64 of this embodiment, located within the bolt connection pair, effectively prevents the core plate 1 from separating from the GFRP buckling restraint cover plate due to the Poisson effect under axial tension, and mitigates loosening of the bolt connection under reciprocating loads.

[0108] The length of the long side of each long slot hole in this embodiment is determined according to the maximum allowable design deformation of the core plate 1 , and the length of the long side of the long slot hole is not less than twice the diameter of the bolt 61 in the bolt assembly 6 .

[0109] Example 5:

[0110] The present embodiment provides a shape memory alloy plate buckling constraint support with friction energy dissipation, specifically including an iron-based shape memory alloy plate, a stiffening plate 2GFRP buckling constraint cover plate 3, an angle steel 4, a filling plate 5, a structural adhesive, a disc spring 64 and a bolt connection pair, and the performance design goals are no damage in small earthquakes, activation of the core plate 1 for reset without disassembly in medium earthquakes, and in-situ replacement of the core plate 1 in large earthquakes.

[0111] In this embodiment, the iron-based shape memory alloy plate serves as the core plate 1, and the stiffening plates 2 are welded to both ends of the core plate 1. The material of the stiffening plates 2 can be steel or an iron-based shape memory alloy. The GFRP buckling restraint cover plates 3 are located on the upper and lower sides of the core plate 1, and the filler plates 5 are located between the GFRP buckling restraint cover plates 3 and the core plate 1. The angle steel 4 is used to connect the stiffening plates 2 and the GFRP buckling restraint cover plates 3. Structural adhesive is used to adhere the GFRP buckling restraint cover plates 3 to the core plate 1. All components of the buckling restraint support except the core plate 1 and the stiffening plates 2 are connected to each other by bolts 61.

[0112] The iron-based shape memory alloy core plate 1 of this embodiment is fabricated into a dogbone shape. A smooth arc transition (i.e., transition section 13) separates the reduced section 11 and the anchoring section 12 of the core plate 1. The anchoring section 12 is welded with a stiffening plate 2. Without removing the GFRP buckling restraint cover plate 3, the iron-based shape memory alloy core plate 1 can be activated by electromagnetic heating with an electromagnetic coil 7 to a temperature of 150-400°C. This allows for the plate to recover from deformation caused by seismic loads without causing thermal damage to the attached main structure.

[0113] The GFRP buckling-restrained cover plate 3 of this embodiment is tightly adhered to the surface of the core plate 1 using structural adhesive and compressed by disc springs 64. The clamping force of bolts 61 and the structural adhesive secure it to the surface of the iron-based shape memory alloy core plate, limiting its buckling deformation during earthquakes. The structural adhesive and GFRP buckling-restrained cover plate 3 of this embodiment are highly suitable for lateral-force-resisting and energy-dissipating components of steel frame structures, increasing the overall tensile stiffness of the buckling-restrained brace by more than 5%.

[0114] The GFRP buckling restraint cover plate 3 of this embodiment can completely cover the reduced section 11 and the transition section 13 of the core plate 1 , and is provided with standard circular bolt holes along its length.

[0115] The openings in the filler plate 5 of this embodiment are positioned and sized identically to those in the GFRP buckling-restrained cover plate 3. Furthermore, the filler plate 5 has the same thickness as the core plate 1, and its ends are arc-shaped, with the same curvature as the core plate 1. There is no gap between the edges of the filler plate 5 and the core plate 1.

[0116] In this embodiment, the angle steel 4 is positioned symmetrically with respect to the stiffening plate 2 and vertically with respect to the core plate 1. Several slots are defined at each leg of the angle steel 4, and several slots are defined at each of the four corners of the GFRP buckling restraint cover plate 3. The length of the long side of each slot is determined based on the maximum allowable design deformation of the core plate 1 and must be no less than twice the diameter of the bolt 61. The friction between the plate and the bolt 61 at the slots provides additional energy dissipation for the overall structure.

[0117] The bolted connection assembly in this embodiment includes a large hexagonal bolt 61, upper and lower washers, and a nut 62. Disc springs 64 are located between the upper and lower washers and the connected plate. Whether the disc springs 64 are connected in series or parallel depends on the actual design requirements. The bolted connection is tightened when each disc spring 64 is initially compressed by 0.375h0.

[0118] Example 6:

[0119] This embodiment provides a specific buckling restraint support for a shape memory alloy plate with friction energy dissipation. Figure 1-8 As shown, the shape memory alloy plate buckling restraint support with friction energy dissipation of this embodiment includes an iron-based shape memory alloy core plate 1, four iron-based shape memory alloy stiffening plates 2, two GFRP buckling restraint cover plates 3, two filling plates 5, eight angle steels 4, forty-eight bolts 61, twenty-eight long slot holes, ninety-six gaskets 63, one hundred and ninety-two disc springs 64, and forty-eight bolts 61.

[0120] Four iron-based shape memory alloy stiffeners 2 are symmetrically welded to the ends of the iron-based shape memory alloy core plate 1 along its length and thickness. Two GFRP buckling restraint cover plates 3 are symmetrically connected by bolt assemblies 6 and arranged at the upper and lower ends of the iron-based shape memory alloy core plate 1 along its thickness. The two GFRP buckling restraint cover plates 3 each have two slots at their respective ends along their length. Two filler plates 5 are symmetrically arranged horizontally on the left and right sides of the iron-based shape memory alloy core plate 1 along its width, and vertically between the two GFRP buckling restraint cover plates 3. The bolt holes 61 provided in the filler plates 5 are all standard round holes. Eight angle steels 4 are symmetrically arranged at each end of the iron-based shape memory alloy core plate 1 along its length, width, and thickness. Each bolt assembly 6 consists of a bolt 61, a nut 62, two washers 63, and four disc springs 64.

[0121] The working principle of the buckling restrained brace of this embodiment is:

[0122] The iron-based shape memory alloy core plate 1 undergoes axial expansion and contraction deformation under seismic loads, and the GFRP buckling restraint cover plate 3 and filler plate 5 are connected and clamped to the iron-based shape memory alloy core plate 1 via bolts 61. The angle steel 4 is connected to the GFRP buckling restraint cover plate 3 with the iron-based shape memory alloy core plate 1 and the iron-based shape memory alloy stiffening plate 2 via bolts 61 passing through slotted holes. This prevents the GFRP buckling restraint cover plate 3 from being subjected to axial loads while allowing the iron-based shape memory alloy core plate 1, stiffening plate 2, GFRP buckling restraint cover plate 3, and angle steel 4 to shift relative to each other, thereby improving the deformation energy dissipation capacity of the core plate 1 and generating additional frictional energy dissipation.

[0123] When the iron-based shape memory alloy core plate 1 is stretched, the disc springs 64 can provide a compressive force on the GFRP buckling restraining cover plate 3, preventing a gap from forming between the iron-based shape memory alloy core plate 1 and the GFRP buckling restraining cover plate 3. When the iron-based shape memory alloy core plate 1 is compressed, the disc springs 64 provide deformation space for the lateral expansion of the iron-based shape memory alloy core plate 1, preventing the GFRP buckling restraining cover plate 3 from bending damage, thereby fully utilizing its energy dissipation capacity.

[0124] The repair methods of this embodiment under different working conditions are as follows:

[0125] (1) Under small earthquake conditions, the buckling restraint support of the shape memory alloy plate with friction energy dissipation is in the elastic stage and does not require repair.

[0126] (2) Under moderate earthquake conditions, an electromagnetic coil 7 is placed on the surface of the iron-based shape memory alloy core plate 1 to complete the temperature increase activation of the iron-based shape memory alloy core plate 1 without disassembly. Specifically, electromagnetic heating is used to activate the core plate 1 to a temperature range of 150 to 400°C to achieve self-reset without causing temperature damage to the main structure.

[0127] (3) Under the condition of a major earthquake, depending on the specific damage situation, the bolt 61 connection of the buckling restraint support of the shape memory alloy plate with friction energy dissipation is dismantled and the damaged component is replaced.

[0128] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A shape memory alloy plate buckling restraint support with friction energy dissipation, characterized in that: The buckling restraint support comprises a core plate (1), stiffening plates (2) provided at both ends of the core plate (1), buckling restraint cover plates (3) provided at the upper and lower sides of the core plate (1), angle steels (4) for connecting the stiffening plates (2) and the buckling restraint cover plates (3), and a filling plate (5) provided between the core plate (1) and the buckling restraint cover plates (3); The core plate (1) is an iron-based shape memory alloy plate, which can recover the deformation caused by earthquake load under local heating at 150-400°C; The stiffening plate (2), the buckling restraint cover plate and the angle steel (4) are all provided with long slots, and the stiffening plate (2) and the angle steel (4), the buckling restraint cover plate (3) and the angle steel (4), and the filling plate (5) and the buckling restraint cover plates (3) on both sides are all connected by bolt assemblies (6), and energy is dissipated between the bolt assemblies (6) and the long slots by friction.

2. The buckling restraint brace of a shape memory alloy plate with friction energy dissipation according to claim 1, characterized in that: The core plate (1) is dog-bone shaped as a whole, and comprises a reduction section (11) and anchoring sections (12) symmetrically arranged at both ends of the reduction section (11); A circular arc-shaped transition section (13) is provided between the reduction section (11) and the anchoring section (12), and the stiffening plate (2) is welded to the anchoring section (12) of the core plate (1).

3. The buckling restraint brace of a shape memory alloy plate with friction energy dissipation according to claim 2, characterized in that: The buckling restraining cover plate (3) can completely cover the reduced section (11) and transition section (13) of the core plate (1); The thickness of the filling plate (5) is consistent with that of the core plate (1), the curvature of the two ends of the filling plate (5) is consistent with that of the transition section (13) of the core plate (1), and there is no gap between the edge of the filling plate (5) and the edge of the core plate (1).

4. The buckling restrained brace of a shape memory alloy plate with friction energy dissipation according to claim 1, characterized in that: The buckling restraining cover plate (3) is symmetrically and tightly adhered to the upper and lower surfaces of the core plate (1) along the thickness direction by means of structural adhesive.

5. The buckling restrained brace of a shape memory alloy plate with friction energy dissipation according to claim 1, characterized in that: The buckling restraint cover plate (3) and the filling plate (5) are both provided with a plurality of bolt holes along the length direction, and the bolt holes of the two correspond to each other one by one.

6. The buckling restrained brace of a shape memory alloy plate with friction energy dissipation according to claim 1, characterized in that: The angle steels (4) are symmetrically arranged with respect to the stiffening plate (2) in the horizontal direction, and symmetrically arranged with respect to the core plate (1) in the vertical direction.

7. The buckling restrained brace of a shape memory alloy plate with friction energy dissipation according to claim 1, characterized in that: Both ends of the buckling restraint cover plate (3) are provided with snap-fitting grooves (31) adapted to the stiffening plate (2); The stiffening plate (2) is provided with a first long slot hole (21), the buckling restraining cover plate (3) is provided with at least one second long slot hole (32) on both sides of the clamping slot (31), and the two limbs of the angle steel (4) are respectively provided with a third long slot hole (41) and a fourth long slot hole (42); The first long slot hole (21) is aligned with the third long slot hole (41), and the second long slot hole (32) is aligned with the fourth long slot hole (42). The bolt assembly (6) can dissipate energy through friction with the above-mentioned long slot holes.

8. The buckling restrained brace of a shape memory alloy plate with friction energy dissipation according to claim 7, characterized in that: The long side length of the long slotted hole is not less than twice the diameter of the bolt (61) in the bolt assembly (6).

9. The buckling restrained brace of a shape memory alloy plate with friction energy dissipation according to claim 1, characterized in that: The bolt assembly (6) includes the bolt connection pair and a disc spring (64), wherein the bolt connection pair includes a bolt (61), a nut (62) and a washer (63); A washer (63) is provided between the head of the bolt (61) and the nut (62) and the connected part, and a disc spring (64) is provided between the washer (63) and the connected part.

10. A method for using the shape memory alloy plate buckling restraint support with friction energy dissipation according to any one of claims 1 to 9, characterized in that: include: Under minor earthquake conditions, the buckling restrained brace is in the elastic stage and does not require repair; Under moderate earthquake conditions, an electromagnetic coil (7) is arranged on the surface of the buckling restraint support to locally heat the buckling restraint support to achieve self-reset; Under a major earthquake condition, the bolt assembly (6) of the buckling restraint support is disassembled and the damaged component is replaced.

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