A replaceable self-resetting energy dissipation fabricated vertical connection node

Abstract

The application relates to a replaceable self-resetting energy dissipation assembly type vertical connecting joint, which comprises a prefabricated concrete column, a pre-buried connecting plate, an energy dissipation connecting plate and an SMA self-resetting bolt; two prefabricated concrete columns are connected in the vertical direction, the end portions are in abutment, a pre-buried connecting plate is arranged on the side surface of the connecting position of the two prefabricated concrete columns, a notch is arranged inwardly in the pre-buried connecting plate, and a box type connecting piece is arranged in the notch; the SMA self-resetting bolt passes through the adjacent two box type connecting pieces; the energy dissipation connecting plate is covered on the pre-buried connecting plate, and two C-shaped energy dissipation grooves are arranged on the energy dissipation connecting plate. The energy dissipation connecting plate is combined with the reset bolt, energy is dissipated through friction and deformation when small earthquakes occur, but the deformation of all parts in the connecting joint is within the elastic range of the SMA self-resetting bolt, and self-recovery can be realized through the SMA self-resetting bolt. When large earthquakes occur, the damage of the component only occurs on the energy dissipation connecting plate, and the emergence and development of cracks on the prefabricated concrete column are avoided.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated concrete building technology, specifically relating to a replaceable, self-resetting, energy-dissipating prefabricated vertical connection node. Background Technology

[0002] With the rapid development of prefabricated buildings in my country, dry connection technology has been widely promoted both inside and outside the industry because its main components are mass-produced in factories, resulting in high component quality, no need for extensive on-site wet work, and convenient and rapid on-site installation. It also meets the development concept of green, environmentally friendly, energy-saving and efficient prefabricated buildings.

[0003] However, existing dry vertical connection nodes in prefabricated concrete frame structures still have the following problems: First, existing dry vertical connection nodes generally lack overall integrity, requiring assurance of the effectiveness of connections between prefabricated components; second, sleeve grouting connection is the most widely used vertical connection method in prefabricated concrete frame structures, mainly transferring axial stress of the reinforcing bars through the reinforcing bars, sleeves, and grout, but its reliability is greatly affected by the quality of grouting within the sleeve, and the quality of grouting within the sleeve is often difficult to effectively inspect; finally, during earthquakes, traditional vertical connection nodes in concrete frames mainly rely on concrete failure and plastic deformation of the reinforcing bars to dissipate seismic energy, resulting in insufficient energy dissipation capacity and difficulty in repair. Furthermore, existing vertical connection node structures derived from this have not shown better seismic energy dissipation performance, and damage occurring at the connection points is often accompanied by rigid failure of beams and columns, making repair neither worthwhile nor feasible. Therefore, a prefabricated frame structure vertical connection node is needed that is structurally reliable, simple to assemble, has strong energy dissipation capacity during earthquakes, and is economical and timely to repair after an earthquake. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a replaceable, self-resetting, energy-dissipating, prefabricated vertical connection node. The technical problem to be solved by this invention is achieved through the following technical solution:

[0005] The present invention provides a replaceable self-resetting energy-dissipating prefabricated vertical connection node, comprising: a precast concrete column, a pre-embedded connection plate, an energy-dissipating connection plate, and an SMA self-resetting bolt;

[0006] The two precast concrete columns are connected vertically, with their ends touching. An embedded connecting plate is provided on the side surface at the connection point of the two precast concrete columns.

[0007] The embedded connecting plate is provided with an inward groove, and a box-shaped connector is provided in each groove, which is fixedly connected to the precast concrete column.

[0008] The SMA self-resetting bolt passes through two adjacent box-shaped connectors, and the two precast concrete columns are connected by the SMA self-resetting bolt.

[0009] The energy-consuming connection plate covers the pre-embedded connection plate and is fixedly connected to the pre-embedded connection plate;

[0010] The energy-consuming connection plate is provided with two C-shaped energy-consuming slots, and the opening directions of the two C-shaped energy-consuming slots are the same.

[0011] In one embodiment of the present invention, the C-shaped energy dissipation trough is vertically disposed at the connection position of the two precast concrete columns to generate directional energy dissipation deformation.

[0012] In one embodiment of the present invention, the openings of two C-shaped energy dissipation slots on two mutually perpendicular energy dissipation connection plates are arranged opposite each other.

[0013] In one embodiment of the present invention, the side wall plate of the pre-embedded connecting plate is disposed on the side surface of the connection position of the precast concrete column; the side wall plate is provided with a plurality of welding bolt holes, and the energy dissipation connecting plate and the pre-embedded connecting plate are connected by connecting bolts and the welding bolt holes.

[0014] In one embodiment of the present invention, the box-shaped connector includes: an upper base plate, a lower base plate, and two side plates;

[0015] The upper base plate and the lower base plate are spaced apart in the vertical direction and are respectively connected to the two ends of the two side plates, and the two side plates are perpendicular to each other;

[0016] The bottom plates of two adjacent box-shaped connectors are adjacent;

[0017] Aligned holes are provided on the upper base plate and the lower base plate. The holes on the upper base plate are used to connect the precast concrete column, and the holes on the lower base plate are used to connect the SMA self-resetting bolt.

[0018] In one embodiment of the present invention, the SMA self-resetting bolt includes: an SMA bolt rod, a disc spring, a spring, a washer, and a nut;

[0019] Both ends of the SMA bolt rod are threaded;

[0020] The SMA bolt is inserted into the hole on the bottom plate of two adjacent box-shaped connectors and fixed by the nut;

[0021] The disc spring, the spring, and the washer are disposed between the nut and the lower base plate on the same side;

[0022] The disc spring is sleeved on the SMA bolt rod, the spring is sleeved outside the disc spring, and the washer is disposed on the lower base plate on the same side.

[0023] In one embodiment of the present invention, a plurality of vertical reinforcing bars are provided in the precast concrete column along the vertical direction, and spiral stirrups are provided on the outer periphery of the plurality of vertical reinforcing bars.

[0024] In one embodiment of the present invention, the vertical reinforcing bars are fixedly connected to the holes on the upper bottom plate of the box-shaped connector to form a reinforcing bar grid.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The replaceable, self-resetting, energy-dissipating prefabricated vertical connection node of this invention combines an energy-dissipating connection plate with a reset bolt. During minor earthquakes, the energy-dissipating connection plate dissipates energy through friction with the pre-embedded connection plate, and also through plastic deformation via the double C-shaped energy-dissipating grooves, preventing excessive deformation of the precast concrete column during earthquakes. Especially under minor earthquake conditions, the deformation of all parts within the connection node remains within the elastic range of the self-resetting bolt. Through the self-resetting action of the SMA self-resetting bolt, the elastic deformation of the vertical connection node recovers on its own. During major earthquakes, the pre-embedded connection plate strengthens the vertical connection node of the precast concrete column, preventing the appearance and development of cracks in the precast concrete column. The energy-dissipating connection plate dissipates energy through both friction and plastic deformation, ensuring that damage to the component occurs only on the energy-dissipating connection plate. Furthermore, since the energy-dissipating connection plate and the pre-embedded connection plate are connected only by bolts, rapid repair and replacement after an earthquake are facilitated.

[0027] The SMA self-resetting bolt of this invention utilizes the combined action of the SMA self-resetting material, a spring, and a disc spring. The disc spring provides sufficient circumferential load-bearing capacity for the vertical connection node while also enhancing the self-resetting and load-bearing capabilities of the SMA self-resetting bolt, ensuring that it does not undergo plastic deformation and can self-reset after an earthquake. Simultaneously, the bolt connection is convenient and quick, with high construction reliability, which is beneficial for production and construction.

[0028] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of a replaceable self-resetting energy-dissipating vertical connection node provided in an embodiment of the present invention;

[0030] Figure 2 This is a structural side view of a replaceable self-resetting energy-dissipating vertical connection node provided in an embodiment of the present invention;

[0031] Figure 3 This is an exploded structural diagram of the pre-embedded connecting plate provided in an embodiment of the present invention;

[0032] Figure 4 This is a three-dimensional structural schematic diagram of the energy-consuming connection plate provided in an embodiment of the present invention;

[0033] Figure 5a This is a schematic diagram of the structure of the SMA self-resetting bolt provided in an embodiment of the present invention;

[0034] Figure 5b This is a schematic diagram of the internal structure of the SMA self-resetting bolt provided in an embodiment of the present invention.

[0035] Icons: 10-Precast concrete column; 20-Embedded connecting plate; 21-Side wall panel; 22-Box-type connector; 221-Upper base plate; 222-Lower base plate; 223-Side plate; 23-Welding bolt hole; 30-Energy dissipation connecting plate; 31-C-type energy dissipation trough; 40-SMA self-resetting bolt; 41-SMA bolt rod; 42-Disc spring; 43-Spring; 44-Washer; 45-Nut; 50-Connecting bolt; 60-Vertical reinforcement; 70-Stirrup. Detailed Implementation

[0036] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following describes in detail a replaceable self-resetting energy-dissipating assembled vertical connection node proposed according to the present invention, in conjunction with the accompanying drawings and specific embodiments.

[0037] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and concrete understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the technical solutions of the present invention.

[0038] Example 1

[0039] Please refer to the above. Figure 1 and Figure 2 The replaceable self-resetting energy-dissipating prefabricated vertical connection node of the present invention includes: a precast concrete column 10, a pre-embedded connection plate 20, an energy-dissipating connection plate 30, and an SMA self-resetting bolt 40.

[0040] In this embodiment, the precast concrete column 10 is a reinforced concrete structure that can be precast in a factory or cast on site. The upper and lower precast concrete columns 10 have the same structure and are equipped with several vertical steel bars 60. The vertical steel bars 60 are arranged vertically, and spiral stirrups 70 are arranged around the periphery of the vertical steel bars 60. The columns are fixed by binding with the stirrups 70. Concrete is filled in the gap between the vertical steel bars 60 and the stirrups 70, so that the precast concrete column 10 forms a cubic column structure. Two precast concrete columns 10 are vertically connected, with their ends fitting together. An embedded connecting plate 20 is provided on the side surface of the connection position of the two precast concrete columns 10. The embedded connecting plates 20 are connected by welding. The embedded connecting plates 20 on each precast concrete column 10 are the same size and flush in height. That is, the embedded connecting plates 20 are embedded in the side surface of the connection position of the precast concrete column 10. The connection position of the precast concrete column 10 is reinforced by the embedded connecting plates 20 to improve the load-bearing capacity of the connection position of the precast concrete column 10 during earthquakes.

[0041] In this embodiment, at the junction of the sides of the precast concrete column 10, a slot is provided inward from the embedded connecting plate 20. For example, since the precast concrete column 10 is a cubic column, four slots are provided at the junction of the sides of each precast concrete column 10, with the two slots located on the diagonal of the cube being symmetrical to each other. A box-shaped connector 22 is provided in each slot, and the precast concrete column 10 is fixedly connected by the box-shaped connector 22.

[0042] In an optional embodiment, the structure of the box-type connector 22 can be found in [reference needed]. Figure 3 The system includes: an upper base plate 221, a lower base plate 222, and two side plates 223. The upper base plate 221 and the lower base plate 222 are spaced apart vertically and connect the two ends of the two side plates 223, which are perpendicular to each other. The lower base plates 222 of two adjacent box-shaped connectors 22 are also adjacent. That is, the upper base plate 221 of the box-shaped connector 22 in the upper precast concrete column 10 is located above the lower base plate 222, while the lower precast concrete column 10 should be considered as mirror-symmetrical about the connection end faces of the two precast concrete columns 10, that is, the upper base plate 221 should be located below the lower base plate 222, so that the two lower base plates 222 are adjacent. Aligned channels are provided on the upper base plate 221 and the lower base plate 222. The channel on the upper base plate 221 is used to connect the precast concrete column 10, and the channel on the lower base plate 222 is used to connect the SMA self-resetting bolt 40. The holes in the two adjacent bottom plates 222 are also aligned, so that the SMA self-resetting bolt 40 can be smoothly inserted into the hole.

[0043] In an alternative embodiment, vertical reinforcing bars 60 are fixedly connected to the holes in the upper bottom plate 221 of the box-type connector 22 to form a reinforcing bar grid.

[0044] Furthermore, the SMA self-resetting bolt 40 passes through two adjacent box-shaped connectors 22, and the two precast concrete columns 10 are connected by the SMA self-resetting bolt 40. That is, the upper and lower precast concrete columns 10 are connected by the box-shaped connectors 22, and the two box-shaped connectors 22 are connected by the SMA self-resetting bolt 40. Since the main component of the SMA self-resetting bolt 40 is the SMA bolt rod 41 made of SMA (Shape memory alloy) material, it has a certain elasticity and exhibits a recoverable property. This allows the vertical connection node to self-reset due to deformation caused by earthquakes or other reasons, and also improves the load-bearing capacity of the vertical connection node.

[0045] In this embodiment, in addition to the SMA self-resetting bolt 40, an energy-dissipating connecting plate 30 is also provided, which covers the pre-embedded connecting plate 20. Specifically, the side wall plate 21 of the pre-embedded connecting plate 20 is provided on the side surface of the connection position of the precast concrete column 10, and the energy-dissipating connecting plate 30 is provided on the side wall plate 21. Several welding bolt holes 23 are provided on the side wall plate 21, and the fixed connection between the energy-dissipating connecting plate 30 and the pre-embedded connecting plate 20 is achieved by connecting bolts 50 to connect the welding bolt holes 23. Two C-shaped energy-dissipating grooves 31 are provided on the energy-dissipating connecting plate 30, and the opening directions of the two C-shaped energy-dissipating grooves 31 are the same.

[0046] In an alternative embodiment, the welding bolt hole 23 is embedded inside the side surface of the connection location of the precast concrete column 10.

[0047] It is worth noting that the energy-dissipating connecting plate 30 in this embodiment absorbs seismic energy through elastic or plastic deformation, thus achieving energy dissipation. This is achieved through a C-shaped energy-dissipating groove 31, which is vertically positioned at the connection point of the two precast concrete columns 10 to generate directional energy-dissipating deformation. The C-shaped structure enables the energy-dissipating connecting plate 30 to simultaneously achieve deformation energy dissipation capacity in three directions: vertical, inward along the plane normal, and outward along the plane normal. For example, when an earthquake occurs, the seismic energy causes deformation at the vertical connection node. This deformation manifests as plastic deformation along the C-shaped energy-dissipating groove 31 on the energy-dissipating connecting plate 30. This plastic deformation dissipates the seismic energy, ensuring that the remaining seismic energy is less than the maximum bearing capacity of the precast concrete column 10, thereby guaranteeing the structural integrity of the precast concrete column 10. Furthermore, there is a large frictional force between the connecting surfaces of the energy-dissipating connecting plate 30 and the embedded connecting plate 20, which also plays a role in energy dissipation after deformation occurs. The connection method, which involves overlapping the energy-dissipating connecting plate 30 with the pre-embedded connecting plate 20 and connecting them with bolts, is beneficial for assembly and rapid repair after an earthquake.

[0048] Furthermore, the vertical groove of the C-shaped energy dissipation channel 31 (the hollow part along the vertical edge of the energy dissipation connecting plate 30) passes through the connection point of the two precast concrete columns 10, that is, the vertical groove spans the connection end face of the two precast concrete columns 10. It is easy to understand that the connection end face is also the area where plastic deformation is most likely to occur. The distribution of the C-shaped energy dissipation channel 31 on the connection end face is not limited; it can be evenly distributed vertically or unevenly distributed.

[0049] Preferably, the two C-shaped energy-consuming slots 31 can be a smaller C-shaped slot nested inside another larger C-shaped slot. That is, the two C-shaped energy-consuming slots 31 are set with a smaller C-shaped slot inside the opening of a larger C-shaped slot, and the opening directions of the C-shaped energy-consuming slots 31 of the two mutually perpendicular energy-consuming connecting plates 30 are arranged opposite each other. At the same time, the height and size of the opposite C-shaped energy-consuming slots 31 are the same, that is, the opening direction of the C-shaped energy-consuming slots 31 is the same as the position of the box-shaped connector 22.

[0050] Furthermore, since the connection between the energy-consuming connecting plate 30 and the embedded connecting plate 20 is achieved through connecting bolts 50 and welding bolt holes 23, and the energy-consuming connecting plate 30 is also provided with a C-shaped energy-consuming groove 31, the bolt connection positions should also make certain adjustments to avoid the C-shaped energy-consuming groove 31. Please refer to [link to relevant documentation]. Figure 4 Connecting bolts 50 are installed around the C-shaped energy dissipation groove 31.

[0051] In this embodiment, please refer to the structure of the SMA self-resetting bolt 40. Figure 5a and Figure 5bThe system includes: an SMA bolt rod 41, a disc spring 42, a spring 43, a washer 44, and a nut 45. The main body of the SMA bolt rod 41 is made of SMA material, which has an elastic recovery capacity far exceeding that of ordinary materials. That is, under the action of external force load that puts a conventional bolt into the plastic stage, the SMA bolt rod 41 can still maintain elasticity, so that the vertical connection node returns to its pre-earthquake state after the earthquake. Both ends of the SMA bolt rod 41 are provided with threads for connecting the nut 45. The SMA bolt rod 41 is inserted into the holes on the lower base plate 222 of two adjacent box-shaped connectors 22 and fixed by the nut 45, which is also used to apply prestress. The disc spring 42, spring 43, and washer 44 are arranged between the nut 45 and the lower base plate 222 on the same side. The disc spring 42 is sleeved on the SMA bolt rod 41, the spring 43 is sleeved on the outside of the disc spring 42, and the washer 44 is arranged on the lower base plate 222 on the same side.

[0052] It is worth noting that the disc spring 42 and the spring 43 enhance the axial load-bearing capacity of the SMA bolt rod 41. That is, through the combined action of the SMA bolt rod 41, the spring 43 and the disc spring 42, the load-bearing capacity requirement is met and the self-resetting capability is provided. The self-resetting capability is further enhanced by the spring 43 and the disc spring 42. In view of the problem that the excessive deformation of the disc spring 42 during the operation process can easily cause the nut 45 to loosen, the outer spring 43 of the disc spring 42 ensures that the nut 45 is always under force, thus making it less likely to loosen.

[0053] All components of the replaceable, self-resetting, energy-dissipating prefabricated vertical connection node in this embodiment can be prefabricated in the factory, eliminating wet work on site and facilitating production. Compared to the conventional grouting sleeve connection method, which is a concealed project, the SMA bolt rod 41 connection has the advantages of bolt connection, which is convenient, fast, and has high construction reliability. In actual construction, the side wall plate 21 of the embedded connection plate 20 is embedded into the precast concrete column 10. The box-shaped connector 22 is formed by welding the upper base plate 221, the lower base plate 222, and two side plates 223. Corresponding holes need to be drilled on the upper base plate 221 and the lower base plate 222. The upper base plate 221 is connected to the vertical reinforcing bars 60 by plug welding to form a reinforcing mesh. Holes are drilled on the side wall plate 21 and corresponding bolt holes 23 are welded. The energy-dissipating connection plate 30 is fixed to the embedded connection plate 20 by connecting bolts 50 to the welded bolt holes 23. When installing the SMA self-resetting bolt 40, it is necessary to calibrate the upper and lower precast concrete columns 10 to align them, insert the SMA bolt rod 41, install the washer 44, disc spring 42 and spring 43 in sequence, and apply prestress through the nut 45.

[0054] The replaceable, self-resetting, energy-dissipating prefabricated vertical connection node of this invention combines an energy-dissipating connection plate with a reset bolt. During minor earthquakes, the energy-dissipating connection plate dissipates energy through friction with the pre-embedded connection plate, and also through plastic deformation via the double C-shaped energy-dissipating grooves, preventing excessive deformation of the precast concrete column during earthquakes. Especially under minor earthquake conditions, the deformation of all parts within the connection node remains within the elastic range of the self-resetting bolt. Through the self-resetting action of the SMA self-resetting bolt, the elastic deformation of the vertical connection node recovers on its own. During major earthquakes, the pre-embedded connection plate strengthens the vertical connection node of the precast concrete column, preventing the appearance and development of cracks in the precast concrete column. The energy-dissipating connection plate dissipates energy through both friction and plastic deformation, ensuring that damage to the component occurs only on the energy-dissipating connection plate. Furthermore, since the energy-dissipating connection plate and the pre-embedded connection plate are connected only by bolts, rapid repair and replacement after an earthquake are facilitated.

[0055] The SMA self-resetting bolt of this invention utilizes the combined action of the SMA self-resetting material, a spring, and a disc spring. The disc spring provides sufficient circumferential load-bearing capacity for the vertical connection node while also enhancing the self-resetting and load-bearing capabilities of the SMA self-resetting bolt, ensuring that it does not undergo plastic deformation and can self-reset after an earthquake. Simultaneously, the bolt connection is convenient and quick, with high construction reliability, which is beneficial for production and construction.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0057] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A replaceable, self-resetting, energy-dissipating, prefabricated vertical connection node, characterized in that, include: Precast concrete columns, embedded connecting plates, energy-dissipating connecting plates, and SMA self-resetting bolts; The two precast concrete columns are connected vertically, with their ends touching. An embedded connecting plate is provided on the side surface at the connection point of the two precast concrete columns. The embedded connecting plate is provided with an inward groove, and a box-shaped connector is provided in each groove, which is fixedly connected to the precast concrete column. The SMA self-resetting bolt passes through two adjacent box-shaped connectors, and the two precast concrete columns are connected by the SMA self-resetting bolt. The energy-dissipating connecting plate covers the pre-embedded connecting plate and is fixedly connected to the pre-embedded connecting plate; the energy-dissipating connecting plate is provided with two C-shaped energy-dissipating grooves, and the opening directions of the two C-shaped energy-dissipating grooves are the same; when a small earthquake occurs, the energy-dissipating connecting plate and the pre-embedded connecting plate dissipate energy through friction, and also dissipate energy through plastic deformation generated by the double C-shaped energy-dissipating grooves provided on it, thus avoiding excessive deformation of the precast concrete column during the earthquake; The C-shaped energy dissipation trough is vertically arranged at the connection position of the two precast concrete columns to generate directional energy dissipation deformation. The openings of the two C-shaped energy-consuming slots on the two mutually perpendicular energy-consuming connecting plates are arranged opposite each other; The side wall of the pre-embedded connecting plate is disposed on the side surface of the connection position of the precast concrete column; The side wall plate is provided with a number of welding bolt holes, and the energy-consuming connecting plate and the pre-embedded connecting plate are connected by connecting bolts and the welding bolt holes; The SMA self-resetting bolt includes: an SMA bolt rod, a disc spring, a spring, a washer, and a nut; Both ends of the SMA bolt rod are threaded; The SMA bolt is inserted into the hole on the bottom plate of two adjacent box-shaped connectors and fixed by the nut; The disc spring, the spring, and the washer are disposed between the nut and the lower base plate on the same side; The disc spring is sleeved on the SMA bolt rod, the spring is sleeved outside the disc spring, and the washer is disposed on the lower base plate on the same side.

2. The replaceable self-resetting energy-dissipating prefabricated vertical connection node according to claim 1, characterized in that, The box-shaped connector includes: an upper base plate, a lower base plate, and two side plates; The upper base plate and the lower base plate are spaced apart in the vertical direction and are respectively connected to the two ends of the two side plates, and the two side plates are perpendicular to each other; The bottom plates of two adjacent box-shaped connectors are adjacent; Aligned holes are provided on the upper base plate and the lower base plate. The holes on the upper base plate are used to connect the precast concrete column, and the holes on the lower base plate are used to connect the SMA self-resetting bolt.

3. The replaceable self-resetting energy-dissipating prefabricated vertical connection node according to claim 1, characterized in that, The precast concrete column has several vertical reinforcing bars arranged along the vertical direction inside, and spiral stirrups are arranged around the outer periphery of the several vertical reinforcing bars.

4. The replaceable self-resetting energy-dissipating prefabricated vertical connection node according to claim 3, characterized in that, The vertical reinforcing bars are fixedly connected to the holes on the upper bottom plate of the box-shaped connector to form a reinforcing bar grid.

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