Multi-directional assembly modular steel structure connecting joint and modular steel structure

Abstract

Multi-directional assembled modular steel structure connecting joint and modular steel structure belong to the field of building engineering. In order to solve the problem that the existing modular steel structure joint is easy to damage and cause residual deformation under strong earthquake action, the present application comprises a module connecting plate and a module connector, the module connector is provided with a plurality of and is divided into two groups, the two groups of module connectors are symmetrically arranged on the upper and lower sides of the module connecting plate and are fixedly connected with the module connecting plate, the plurality of module connectors in the same group are uniformly and symmetrically arranged in the circumferential direction, the adjacent two module connectors in the same group are fixedly connected, and the adjacent two module connectors in the same group are provided with a matching embedded groove and an embedded block to realize the positioning between the module connectors after assembly. The present application is mainly used for the connection at the beam-column joint.

Description

Technical Field

[0001] This invention belongs to the field of building engineering and relates to a multi-directional modular steel structure connection node and a modular steel structure. Background Technology

[0002] Modular steel structure buildings typically involve manufacturing the beams, columns, and enclosure components of box-type modules in a factory, and then assembling them horizontally and vertically on the construction site. Adjacent modules often form double-beam, double-column, or multi-beam-multi-column intersection structures at joints. In addition to transmitting vertical axial forces, the module connection nodes must also bear the in-plane shear forces of the floor slab, bending moments and tensile and compressive forces caused by horizontal seismic actions, while also taking into account hoisting positioning, construction errors, on-site operability, and post-earthquake repairability.

[0003] Existing modular steel structure nodes mostly use end plates, corner pieces, connecting plates, and high-strength bolts to complete the internal and inter-module connections. This results in a large number of node components, limited on-site fastening space, and the fact that horizontal connections, vertical connections, and prestressed anchoring are usually independent, easily leading to problems such as circuitous force transmission paths, localized stress concentration in plates, and difficulties in coordinating installation accuracy. While simply increasing node stiffness can limit interface displacement, under strong earthquakes, damage may concentrate on the bolt hole walls, connecting plates, welds, or the main beam / column structure, potentially resulting in significant residual deformation. Summary of the Invention

[0004] In view of this, the present invention provides a multi-directional modular steel structure connection node and a modular steel structure, which uses a gap-fitting interlocking groove and interlocking block to constrain the connectors of adjacent modules, avoid the load being concentrated on the bolt hole wall, connecting plate, weld or beam and column body, and reduce the deformation of the steel structure.

[0005] The technical solution adopted in this invention is as follows:

[0006] A first aspect of the present invention provides a multi-directional modular steel structure connection node, comprising:

[0007] Module connection board;

[0008] The module connectors are provided in multiple groups, which are divided into upper and lower groups. The two groups of module connectors are symmetrically arranged on the upper and lower sides of the module connection plate and are fixedly connected to the module connection plate. The multiple module connectors in the same group are evenly and symmetrically arranged along the circumferential direction. The two adjacent module connectors in the same group are fixedly connected, and the two adjacent module connectors in the same group are provided with mating grooves and mating blocks to achieve positioning between the module connectors after assembly.

[0009] Furthermore, the fitting groove and the fitting block adopt a clearance fit.

[0010] Furthermore, the modular connector adopts a cavity structure with multiple reinforcing ribs inside to ensure the overall strength of the modular connector and provide anchoring positions for the prestressed steel strands.

[0011] Furthermore, multiple assembly plates are respectively arranged on the upper and lower sides of the module connection plate. Each assembly plate is located between two adjacent module connectors in the same group and is fixedly connected to them.

[0012] Furthermore, both the upper and lower surfaces of the module connection plate are provided with shear keys, and the side surface of the module connector facing the module connection plate is provided with keyholes that match the shear keys. When the module connector is assembled to the corresponding position on the module connection plate, the shear keys are inserted into the corresponding keyholes, and the two are fitted with a clearance fit.

[0013] A second aspect of the present invention provides a multi-directional modular steel structure, characterized in that it includes channel steel columns, T-beams, and multi-directional assembly connection nodes. Multiple channel steel columns are arranged between two longitudinally adjacent connection nodes, and the upper and lower ends of each channel steel column are welded to two module connectors arranged opposite to each other in the two vertically adjacent connection nodes. Multiple T-beams are arranged between two horizontally adjacent connection nodes, and the end of each T-beam is connected to two module connectors arranged opposite to each other in the two adjacent connection nodes.

[0014] Furthermore, it also includes a friction energy dissipation mechanism arranged at the web of the upper and lower T-beams. When the modular steel structure undergoes inter-story displacement under horizontal load, the friction energy dissipation mechanism generates friction energy dissipation as the relative misalignment between the upper and lower T-beams occurs, in order to absorb and dissipate the load energy.

[0015] Furthermore, each friction energy dissipation mechanism includes a rotating friction plate and a fixed friction disc. There are two fixed friction discs, which are welded to the webs of two adjacent T-beams. The rotating friction plate is a long strip plate structure, with its two ends rotatably mounted on the webs of the T-beams. The rotating friction plate is in close contact with the two fixed friction discs to form two sets of friction pairs.

[0016] Furthermore, the outer surface of the fixed friction disc has multiple radial fixed ribs spaced apart along the circumference, and the surface of the rotating friction plate facing the fixed friction disc has multiple radial rotating ribs spaced apart along the circumference. The radial fixed ribs and the radial rotating ribs are arranged alternately along the circumference and interlock with each other, and the surfaces of both are sputtered with friction material to form a multi-tooth meshing friction interface.

[0017] Furthermore, multiple sets of prestressed steel strands are arranged between two horizontally adjacent connection nodes. Each set of prestressed steel strands is connected to two module connectors arranged opposite to each other in the two adjacent connection nodes to provide prestress to the connection nodes.

[0018] The beneficial effects of this invention compared to the prior art are:

[0019] 1. The modular steel structure connection node of the present invention can be pre-assembled in the factory, and the upper and lower T-beams and friction energy dissipation mechanism can also be pre-assembled in the factory. At the construction site, only the channel steel column and the above-mentioned assembled T-beam need to be hoisted to the assembly position of the connection node for docking and fixing, which can save a lot of on-site assembly work and improve construction efficiency.

[0020] 2. In the connection node of the present invention, a limiting structure consisting of a fitting groove and a fitting block is designed between adjacent module connectors. A shear key and a keyhole are designed between the module connector and the module connection plate. Under normal load and small earthquake, the limiting structure consisting of the fitting groove and the fitting block, as well as the shear key and the keyhole, form a bidirectional constraint on the adjacent module connectors. The two work together to share the shear force at the module connection interface, reduce the shear force of the connecting bolts, prevent the bolts from fatigue damage under long-term load, and ensure the overall stiffness and load-bearing reliability of the node in the elastic stage.

[0021] 3. In the modular steel structure of this invention, a friction energy dissipation mechanism is designed at the web of the upper and lower T-beams. During a strong earthquake, when the upper and lower T-beams undergo relative translation, rotation, or partial opening and closing, the relative positions of the centers of the upper and lower fixed friction discs change, driving the rotating friction plate to swing around the bolt axis at a small angle. This causes the two sets of friction pairs to slide relative to each other, converting the relative displacement between the beams and columns into the relative rotation angle of the friction pairs and dissipating the seismic energy through friction. Since the seismic energy is mainly dissipated by the controlled sliding of the friction pairs, the damage is no longer concentrated on the bolt hole wall, connecting plate, weld, or main beam and column structure. This overcomes the defect of simply increasing the stiffness of the nodes in the prior art, which leads to concentrated damage to the main components. At the same time, the reserved fitting gap between the interlocking block and the interlocking groove ensures that the limiting structure will not hinder the normal start-up of the energy dissipation mechanism due to rigid locking.

[0022] 4. In the modular steel structure of this invention, prestressed steel strands are designed between adjacent connection nodes. During the post-earthquake unloading stage, the relative displacement of adjacent connection nodes during the earthquake causes the prestressed steel strands to elongate under stress and store elastic strain energy. When the load is unloaded, the steel strands release this energy, forming a restoring force along the beam direction between adjacent connection nodes, driving the connection nodes to rotate back to their initial position. By coordinating the effective prestress of the prestressed steel strands, the friction coefficient of the staggered rib friction pair, and the bolt clamping force, the restoring torque during the unloading stage is made greater than the reverse embedment resistance of the module connection interface, thereby reducing or even eliminating the residual displacement of the structure, overcoming the problem of large residual deformation after earthquakes in existing technologies, and ensuring that the modular steel structure can be quickly restored to its post-earthquake functionality. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are provided to give a further understanding of the invention.

[0024] Figure 1 Assembly drawings for module connection nodes, channel steel columns, friction energy dissipation mechanisms, T-beams, and prestressed steel strands.

[0025] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0026] Figure 3 This is an assembly drawing of the channel steel column and its connecting nodes.

[0027] Figure 4 This is a structural diagram of the connecting nodes.

[0028] Figure 5 This is an exploded view of the connected nodes.

[0029] Figure 6 This is a schematic diagram of the module connector.

[0030] Figure 7 This is a schematic diagram of the first module connector.

[0031] Figure 8 This is a schematic diagram of the second module connector.

[0032] Figure 9 This is a structural diagram of the module connection board.

[0033] Figure 10 This is an assembly drawing of the T-beam, connecting nodes, and friction energy dissipation mechanism.

[0034] Figure 11 This is a schematic diagram of a friction energy dissipation mechanism.

[0035] Figure 12 This is a schematic diagram of the structure of the fixed friction disc.

[0036] Figure 13 This is a schematic diagram of the rotating friction plate.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Module connection plate; 11. Shear key; 12. Assembly plate; 2. Module connector; 21. Fitting groove; 22. Fitting block; 23. Key hole; 24. Vertical support rib; 25. Left square cavity; 26. Middle right-angle cavity; 27. Right square cavity; 28. Horizontal support rib; 29. ​​Vertical support column; 3. Channel steel column; 4. T-beam; 5. Friction energy dissipation mechanism; 51. Rotating friction plate; 511. Radial rotating rib; 52. Fixed friction disc; 521. Radial fixed rib; 6. Prestressed steel strand; 7. Inter-column connection plate; 8. Beam connection plate. Detailed Implementation

[0039] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] See Figures 1 to 5 This embodiment provides a multi-directional modular steel structure connection node for beam-column joint connections. The connection node includes a modular connection plate 1 and eight modular connectors 2. The eight modular connectors 2 are divided into two groups, symmetrically arranged on the upper and lower sides of the modular connection plate 1. Four modular connectors 2 within each group are evenly and symmetrically arranged circumferentially. In each group, two diagonally opposite modular connectors 2 are designated as first modular connectors, and the other two diagonally opposite modular connectors 2 are designated as second modular connectors. That is, the two first modular connectors and two second modular connectors within the same group are alternately arranged circumferentially. Thus, the entire connection node forms two identical, mirror-image assembly units on the upper and lower sides of the modular connection plate 1. Figure 3 , Figure 4 and Figure 5 The module connector 2 adopts an L-shaped right-angle structure, with both right-angled surfaces serving as module assembly interfaces. On the two module assembly interfaces of the first module connector, near the top corner, there are mating grooves 21, preferably in a grid pattern. On the two module assembly interfaces of the second module connector, at corresponding positions near the top corner, there are four mating blocks 22. When assembling the four module connectors 2 in the same group, the two module assembly interfaces of the first module connector are respectively arranged opposite to the module assembly interfaces of the two adjacent second module connectors. When the module assembly interfaces approach each other, the four mating blocks 22 on the second module connector are embedded into the corresponding mating grooves 21 on the first module connector, achieving initial positioning, with a fitting gap between the mating blocks 22 and the mating grooves 21.

[0041] Furthermore, each module connector 2 has connection holes on its module assembly interface, and two horizontally adjacent module connectors 2 are fixedly connected by bolts. The four module connectors 2 in the same group, when assembled, form a cross-shaped structure, constituting an assembly unit with multi-directional load-bearing capacity. Correspondingly, the module connection plate 1 adopts a cross-shaped plate structure; bolt holes are provided on the side of the module connector 2 facing the module connection plate 1, and corresponding bolt holes are also provided on the module connection plate 1. Two vertically opposite module connectors 2 are fixedly connected to the module connection plate 1 by bolts, thereby connecting the two assembly units into one.

[0042] In addition, the side surface of each module connector 2 away from the module connecting piece is a column end bearing surface. A channel steel column 3 is welded to the top corner of the column end bearing surface. After the four module connectors 2 in the same group are assembled, a column connecting plate 7 is provided between two adjacent channel steel columns 3. The surfaces of the four channel steel columns 3 are in contact with the surface of the column connecting plate 7 and are fixedly connected by bolts. The two end faces of each module connector 2 away from the top corner are beam end bearing surfaces. Two beam connecting pieces 8 are arranged opposite each other on each beam end bearing surface. A gap is left between the two beam connecting pieces 8 for connecting T-beams 4. That is, one end of the two beam connecting pieces 8 is welded to the end face of the module connector 2, and the other end extends horizontally outward. Four first waist holes are opened on the beam connecting pieces 8. Four second waist holes are opened on the web plate near the end of the T-beam 4. The web plate of the T-beam 4 is inserted into the gap between the two beam connecting pieces 8 and fixedly connected to the two beam connecting pieces 8 by bolts.

[0043] In this embodiment, the beam-column components are assembled in multiple directions at the joint by assembling eight modular connectors 2. Furthermore, the adjacent first and second modular connectors, through the mutual cooperation of the fitting groove 21 and the fitting block 22, can achieve self-positioning during assembly, reducing the difficulty and precision requirements of hoisting alignment. Simultaneously, this fitting structure can limit the misalignment of the modular connectors 2 in the out-of-plane direction, resist out-of-plane deformation, and share the shear force at the modular assembly interface, reducing the shear burden on the connecting bolts and improving the load-bearing reliability of the joint. Further, a fitting gap is reserved between the fitting block 22 and the fitting groove 21. This gap meets the requirements for manufacturing deviations, hoisting alignment, and displacement under seismic conditions. This avoids the problem of on-site assembly failure due to the use of gapless rigid interlocking, and ensures the normal activation of the friction energy dissipation mechanism 5 under seismic action, giving the joint both good assemblability and seismic energy dissipation performance.

[0044] See Figure 3 , Figure 4 and Figure 5 In this embodiment, the modular connector 2 adopts a cavity structure with multiple reinforcing ribs inside. This design ensures the overall strength of the modular connector 2, providing anchorage for the prestressed steel strands 6, and also creates an internal cavity space, facilitating the insertion and assembly of bolts and prestressed steel strands 6, thus ensuring structural stress requirements and construction feasibility. Specifically, combined with... Figure 3As shown, the module connector 2 has two right-angled cavities arranged side by side. Within the upper right-angled cavity, two vertical support ribs 24 are arranged vertically for connecting the prestressed steel strands 6. These two vertical support ribs 24 divide the upper right-angled cavity into three chambers: a left square cavity 25, a middle right-angled cavity 26, and a right square cavity 27, arranged horizontally. To further enhance the buckling resistance of the vertical support ribs 24 under the tension of the prestressed steel strands 6, transverse support ribs 28 are also provided in the left square cavity 25 and the right square cavity 27. The transverse support ribs 28 can suppress the buckling of the vertical support ribs 24 and improve their bearing capacity. Combined with... Figure 3 As shown, the lower right-angle cavity has two vertical support columns 29 at the opening to enhance the rigidity of the opening edge of the lower right-angle cavity and prevent deformation or local damage at the opening during assembly and stress.

[0045] This embodiment achieves high strength, rigidity, and ease of assembly by rationally arranging reinforcing ribs and support columns inside the module connector 2, resulting in a cavity structure that is lightweight yet possesses high strength, rigidity, and ease of assembly.

[0046] See Figure 4 , Figure 5 and Figure 9 In this embodiment, four assembly plates 12 are vertically arranged on the upper and lower sides of the module connection plate 1. Each assembly plate 12 corresponds to two adjacent module connectors 2, forming a transition connection component between the module connection plate 1 and the module connectors 2. During the assembly of the four module connectors 2 in the same group, each assembly plate 12 is arranged opposite to the module assembly interface of the two adjacent module connectors 2, and its arrangement position avoids the setting position of the fitting groove 21 and the fitting block 22 to avoid interference and ensure effective fit between the module assembly interface and the assembly plate 12. The two adjacent module connectors 2 and the assembly plate 12 between them are fastened together as a whole by bolts. Compared with the direct connection method of two module connectors 2, this embodiment uses the assembly plate 12 for transition connection, which is equivalent to adding an intermediate force transmission component at the connection interface. This not only increases the overall connection strength and rigidity of the eight module connectors 2, but also improves the stress distribution at the connection interface through the transition force transmission of the assembly plate 12, avoiding local stress concentration, thereby further enhancing the load-bearing reliability and structural stability of the node.

[0047] See Figure 5 and Figure 9In this embodiment, shear keys 11 are provided on both the upper and lower surfaces of the module connecting plate 1, with each module connector 2 corresponding to two shear keys 11. Each shear key 11 is preferably positioned between two adjacent bolt holes on the module connecting plate 1. Correspondingly, the side surface of the module connector 2 facing the module connecting plate 1 has keyholes 23 that match the shear keys 11. The shape, size, and position of the keyholes 23 correspond one-to-one with the shear keys 11. When the module connector 2 is assembled to the corresponding position on the module connecting plate 1, the shear keys 11 are inserted into the corresponding keyholes 23, with a clearance fit between them. The shear keys 11 are used for hoisting positioning, transmitting interface shear force, and limiting lower displacement. When the node is subjected to horizontal loads (including horizontal shear force generated by seismic action), the fit between the shear key 11 and the keyhole 23 can directly bear and transmit the horizontal shear force, thereby constraining the module connector 2 in the horizontal direction, preventing relative slippage between the module connector 2 and the module connection plate 1, thereby reducing the shear force on the connecting bolts during the stress process of the connection node, reducing the stress burden on the bolts, and improving the shear resistance and overall load-bearing reliability of the node.

[0048] This embodiment, through the circumferential multi-directional arrangement of eight modular connectors 2, enables convenient connection between columns and beams in multiple directions, meeting the assembly requirements of beam-column components in different directions. Adjacent modular connectors 2 are provided with mating grooves 21 and mating blocks 22. During assembly, the mating blocks 22 are embedded in the mating grooves 21 to form horizontal and vertical constraints. Simultaneously, modular connectors 2 and modular connecting plates 1 are provided with mating shear keys 11 and keyholes 23. During assembly, the shear keys 11 are inserted into the keyholes 23 to form constraints. During normal use of the connection node and minor earthquakes, the synergistic effect of these two constraints ensures that the modular connectors 2 are sufficiently limited in both the horizontal and vertical directions, jointly guaranteeing the node's positioning and stiffness. During major earthquakes, when the relative displacement between modular connectors 2 increases, the shear keys 11 and the hole walls bear pressure to form limits, preventing large-scale relative slippage or misalignment between modules, thus ensuring the overall stiffness and spatial stability of the connection node. In addition, the fitting groove 21 and fitting block 22, as well as the shear key 11 and keyhole 23, can all bear and transmit the corresponding shear internal forces, thereby reducing the shear force on the connecting bolts during the stress process of the connection node, reducing the shear load on the bolts, and improving the seismic performance and long-term safety and reliability of the node.

[0049] Example 2:

[0050] See Figure 1This embodiment provides a multi-directional modular steel structure, mainly used to achieve rapid assembly of beam and column structures on site. The modular steel structure includes channel steel columns 3, T-beams 4, friction energy dissipation mechanisms 5, and multi-directional assembly connection nodes as described in Embodiment 1. The connection nodes are arranged according to the overall stress requirements of the steel structure and the building space layout.

[0051] In the longitudinal direction, four channel steel columns 3 are arranged between two adjacent connection nodes. The upper and lower ends of each channel steel column 3 are welded to two module connectors 2 arranged opposite each other in the two adjacent connection nodes, thereby connecting the adjacent connection nodes into a whole. At the same time, the two adjacent channel steel columns 3 are also fixedly connected by bolts to enhance the integrity and lateral stiffness of the channel steel columns 3. In the horizontal direction, four T-beams 4 are arranged between two adjacent connection nodes. The end of each T-beam 4 is connected to two module connectors 2 arranged opposite each other in the two adjacent connection nodes. The steel web of the end of the T-beam 4 is inserted into the gap between the beam connecting pieces 8 on the corresponding module connector 2 and is fastened to the beam connecting pieces 8 by bolts to achieve reliable force transmission between the beam end and the connection node.

[0052] Furthermore, the two T-beams 4 at the upper position are arranged in a forward orientation, while the two T-beams 4 at the lower position are arranged in a reverse orientation, thus creating a mirror-symmetrical arrangement of the corresponding T-beams 4, with the webs of the upper and lower T-beams 4 facing each other. Four sets of friction energy dissipation mechanisms 5 are provided between horizontally adjacent connection nodes, with one set on each of the inner and outer sides of the upper and lower T-beams 4. Each set contains multiple friction energy dissipation mechanisms 5, which are evenly distributed along the length of the T-beam 4. Each friction energy dissipation mechanism 5 is connected between the webs of the two upper and lower T-beams 4. When the modular steel structure encounters horizontal loads (such as seismic forces) and experiences inter-story displacement, the friction energy dissipation mechanisms 5 generate frictional energy dissipation due to the relative misalignment between the upper and lower T-beams 4, thereby absorbing and dissipating seismic energy, reducing the seismic response of the steel structure, and improving the overall seismic performance and energy dissipation capacity of the modular steel structure.

[0053] Furthermore, see Figure 10In this embodiment, each friction energy dissipation mechanism 5 adopts a rotary friction energy dissipation structure, including a rotary friction plate 51 and a fixed friction disk 52. Two fixed friction disks 52 are provided, respectively welded to the opposite positions of the webs of two adjacent T-beams 4, serving as the fixed end components of the friction energy dissipation mechanism 5. The rotary friction plate 51 is a long strip plate structure, with its two ends fixed to the webs of the two T-beams by bolts. The bolts pass through the rotary friction plate 51, the fixed friction disk 52, and the webs of the T-beams 4 in sequence, applying a set clamping force to ensure that the rotary friction plate 51 is tightly fitted with the two fixed friction disks 52, forming two sets of friction pairs. To prevent the rotary friction plate 51 from jamming due to the rigid constraint of the center distance at both ends during its swing, a rotational fit clearance is provided between the bolt connection hole and the bolt shank on the rotary friction plate 51, providing necessary allowance for the small-angle swing of the rotary friction plate 51.

[0054] The fixed friction disc 52 has multiple radial fixing ribs 521 arranged circumferentially on its outer surface. These radial fixing ribs 521 can be integrally formed with the fixed friction disc 52, or they can be formed by welding or mechanically connecting strip ribs. Correspondingly, the rotating friction plate 51 has multiple radial rotating ribs 511 arranged circumferentially on its surface facing the fixed friction disc 52. The radial fixing ribs 521 and the radial rotating ribs 511 are staggered circumferentially and interlock with each other, forming a multi-tooth meshing friction interface to increase the effective friction area and improve energy dissipation capacity. To prevent stress concentration or scratch damage during meshing, the rib ends of the radial fixing ribs 521 and the radial rotating ribs 511 are preferably rounded or chamfered. Furthermore, a high-friction material layer is sputtered onto the surfaces of the radial fixing ribs 521 and the radial rotating ribs 511 to further improve the coefficient of friction and the stability of frictional energy dissipation.

[0055] When a horizontal seismic action causes a complex displacement between the webs of the upper and lower T-beams 4, such as relative translation, relative rotation, or partial opening and closing, the relative positions of the centers of the two fixed friction discs 52 change accordingly. This drives the rotating friction plate 51 to oscillate at a small angle, causing its two ends to slip relative to the fixed friction discs 52. Thus, the relative displacement between the upper and lower T-beams 4 is converted into the relative rotation angle of the friction pair, and the seismic input energy is dissipated as heat energy through the slip friction at the friction interface. This achieves stable and efficient frictional energy dissipation, reducing the seismic response of the steel structure.

[0056] See Figure 1 , Figure 2 and Figure 11In this embodiment, four sets of prestressed steel strands 6 are arranged between two horizontally adjacent connection nodes. Each set of prestressed steel strands 6 is connected to two module connectors 2 arranged opposite to each other in the two adjacent connection nodes, providing prestress to the node area. The end of each set of prestressed steel strands 6 passes through the left square cavity 25 or the right square cavity 27 inside the corresponding module connector 2 and is anchored to the vertical support rib 24, thereby forming a restoring force channel running through the beam between two horizontally adjacent connection nodes.

[0057] During an earthquake, relative displacement occurs between two horizontally adjacent connection nodes, causing the prestressed steel strands 6 to elongate under stress, thus increasing their tensile strength and providing a restoring force pointing towards the initial position. When the external load is unloaded, the prestressed steel strands 6 release elastic strain energy, driving the connection node to rotate back to its initial position, achieving the node's self-resetting function. Furthermore, by coordinating the matching relationship between the effective prestress of the prestressed steel strands 6, the friction coefficient of the staggered rib friction pair, and the bolt clamping force, the restoring force or restoring moment during the load unloading stage can be made greater than the reverse resistance of the modular connection interface. This reduces or even eliminates the residual displacement of the structure after the earthquake, enabling the modular steel structure to have good restoring ability while dissipating energy and reducing vibration, ensuring that the structure can quickly restore its usability after an earthquake.

[0058] The modular steel structure of this embodiment allows the connection nodes, the upper and lower T-beams, and the friction energy dissipation mechanism to be assembled in the factory in advance. On the construction site, only the channel steel columns and the assembled T-beams need to be hoisted to the assembly position for docking and fixing, which can save a lot of on-site assembly work and improve construction efficiency.

[0059] Under normal loads and minor earthquakes, the limiting structure formed by the interlocking groove and the interlocking block, as well as the shear key and keyhole, form a bidirectional constraint on the connector of adjacent modules. The two work together to share the shear force at the module connection interface, reduce the shear force of the connecting bolts, prevent the bolts from fatigue damage under long-term loads, and ensure the overall stiffness and load-bearing reliability of the node in the elastic stage.

[0060] During a strong earthquake, when the upper and lower T-beams undergo relative translation, rotation, or partial opening and closing, the relative positions of the centers of the upper and lower fixed friction discs change. This drives the rotating friction pads to oscillate around the bolt axis at a small angle, causing relative slippage between the two sets of friction pairs. This converts the relative displacement between the beams and columns into the relative rotation angle of the friction pairs, dissipating seismic energy through friction. Since the seismic energy is mainly dissipated by the controlled slippage of the friction pairs, damage is no longer concentrated on the bolt hole walls, connecting plates, welds, or the main beam and column structure. This overcomes the shortcomings of existing technologies where simply increasing the stiffness of nodes leads to concentrated damage to the main components. At the same time, the pre-reserved fit gap between the interlocking block and the interlocking groove ensures that the limiting structure will not hinder the normal start-up of the energy dissipation mechanism due to rigid locking.

[0061] During the post-earthquake unloading phase, the relative displacement of adjacent connection nodes during the earthquake causes the prestressed steel strands to elongate under stress and store elastic strain energy. When the load is unloaded, the steel strands release this energy, forming a restoring force along the beam direction between adjacent connection nodes, driving the connection nodes to rotate back to their initial positions. By coordinating the effective prestress of the prestressed steel strands, the friction coefficient of the staggered rib friction pairs, and the bolt clamping force, the restoring moment during the unloading phase is made greater than the reverse embedment resistance of the module connection interface, thereby reducing or even eliminating the residual displacement of the structure. This overcomes the problem of large residual deformation after earthquakes in existing technologies and ensures that the modular steel structure can be quickly restored to its post-earthquake functionality.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions created by the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions created by the present invention without departing from the essence and scope of the technical solutions created by the present invention.

Claims

1. A multi-directional modular steel structure connection node, characterized in that, include: Module connection board; The module connectors are provided in multiple groups, which are divided into upper and lower groups. The two groups of module connectors are symmetrically arranged on the upper and lower sides of the module connection plate and are fixedly connected to the module connection plate. The multiple module connectors in the same group are evenly and symmetrically arranged along the circumferential direction. The two adjacent module connectors in the same group are fixedly connected, and the two adjacent module connectors in the same group are provided with mating grooves and mating blocks to achieve positioning between the module connectors after assembly.

2. The modular steel structure connection node for multi-directional assembly according to claim 1, characterized in that, The fitting groove and the fitting block adopt a clearance fit.

3. The modular steel structure connection node for multi-directional assembly according to claim 1, characterized in that, The module connector adopts a cavity structure with multiple reinforcing ribs inside.

4. The modular steel structure connection node for multi-directional assembly according to claim 1, characterized in that, Multiple assembly plates are set on the upper and lower sides of the module connection plate. Each assembly plate is located between two adjacent module connectors in the same group and is fixedly connected to them.

5. The modular steel structure connection node for multi-directional assembly according to claim 1, characterized in that, Both the upper and lower surfaces of the module connection plate are provided with shear keys. The side surface of the module connector facing the module connection plate is provided with a keyhole that matches the shear key. When the module connector is assembled to the corresponding position on the module connection plate, the shear key is inserted into the corresponding keyhole, and the two are fitted with a clearance fit.

6. A multi-directional modular steel structure, characterized in that, It includes channel steel columns, T-beams, and modular steel structure connection nodes for multi-directional assembly as described in any one of claims 1 to 5. Multiple channel steel columns are arranged between two longitudinally adjacent connection nodes, and the upper and lower ends of each channel steel column are welded to two module connectors arranged opposite to each other in the two adjacent vertical connection nodes. Multiple T-beams are arranged between two horizontally adjacent connection nodes, and the end of each T-beam is connected to two module connectors arranged opposite to each other in the two adjacent connection nodes.

7. The multi-directional modular steel structure according to claim 6, characterized in that, It also includes a friction energy dissipation mechanism arranged on the web of the upper and lower T-beams. When the modular steel structure undergoes inter-story displacement under horizontal load, the friction energy dissipation mechanism generates friction energy dissipation as the relative misalignment between the upper and lower T-beams occurs, so as to absorb and dissipate the load energy.

8. The multi-directional modular steel structure according to claim 7, characterized in that, Each friction energy dissipation mechanism includes a rotating friction plate and a fixed friction disc. There are two fixed friction discs, which are welded to the webs of two adjacent T-beams. The rotating friction plate is a long strip plate structure, with its two ends rotatably mounted on the webs of the T-beams. The rotating friction plate is in close contact with the two fixed friction discs to form two sets of friction pairs.

9. The multi-directional modular steel structure according to claim 8, characterized in that, The outer surface of the fixed friction disc has multiple radial fixed ribs spaced apart along the circumference, and the surface of the rotating friction plate facing the fixed friction disc has multiple radial rotating ribs spaced apart along the circumference. The radial fixed ribs and the radial rotating ribs are arranged alternately along the circumference and interlock with each other, and the surfaces of both are sputtered with friction material to form a multi-tooth meshing friction interface.

10. The multi-directional modular steel structure according to claim 6, characterized in that, Multiple sets of prestressed steel strands are arranged between two horizontally adjacent connection nodes. Each set of prestressed steel strands is connected to two module connectors arranged opposite to each other in the two adjacent connection nodes to provide prestress to the connection nodes.

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