Rotary friction energy dissipation connection joint of fabricated external wall panel
By using a four-point external friction energy dissipation connection node, combined with the design of a box damper and friction chain rod, the problems of easy cracking of rigid connection and underutilization of flexible connection in the connection between precast concrete external wall panel and steel frame are solved. This achieves the effect of enhancing stiffness under small earthquakes and effectively dissipating energy under large earthquakes, which is suitable for the safety and economic needs of prefabricated buildings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-31
AI Technical Summary
In existing prefabricated buildings, the connection between precast concrete exterior wall panels and steel frames is rigid, which can easily lead to cracking of the wall panels. Flexible connections fail to fully utilize the strength and stiffness of the wall panels, and friction dampers hinder energy dissipation when the structure undergoes coordinated deformation.
The prefabricated external wall panel rotating friction energy dissipation connection node adopts a four-point external hanging type, including friction energy dissipation connection node unit and load-bearing connection node unit. Through the combination of box damper, friction chain rod and steel frame connector, friction energy dissipation in the vertical and horizontal directions is achieved. Combined with the pre-embedded design of box damper, the structural stiffness is enhanced and sliding energy dissipation is achieved during large earthquakes.
It enhances structural stiffness and controls deformation under minor earthquakes, and dissipates seismic energy through friction under major earthquakes, protecting the wall panels from damage, thus meeting the requirements of construction convenience and safety for prefabricated buildings.
Smart Images
Figure CN224063713U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of prefabricated building technology, and in particular relates to a rotating friction energy dissipation connection node for prefabricated external wall panels. Background Technology
[0002] Prefabricated construction is a new type of building production method that promotes reduced energy consumption, reduced environmental pollution, and maximizes the value throughout the building's lifecycle. Precast concrete exterior wall panels, as an important component of prefabricated buildings, have a significant impact on the overall structural performance and seismic resistance of the building through their connection method with the main structure. When connecting precast concrete exterior wall panels to steel frames, rigid or flexible connection nodes are typically used. Under seismic loading, while rigid connection nodes provide greater lateral stiffness and load-bearing capacity to the main structure, the exterior concrete wall panels are prone to cracking. Flexible connection nodes, on the other hand, ensure that the exterior wall panels do not deform with the main structure, effectively avoiding secondary disasters caused by wall damage. However, the strength and stiffness of the exterior wall panels are not fully utilized, resulting in poor economic efficiency. Friction-based energy-dissipating connection structures combine the advantages of both rigid and flexible connection nodes, offering superior overall performance. Some existing friction dampers, when applied to structures, experience increased pressure between dampers due to coordinated deformation with the structure, leading to increased friction and hindering energy dissipation. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides a prefabricated external wall panel rotational friction energy-dissipating connection node. It adopts a four-point external connection method for connecting precast concrete external wall panels with steel frames, which can effectively improve the deformation of external wall panels and has a good energy dissipation effect.
[0004] A prefabricated external wall panel rotating friction energy dissipation connection node is connected between the precast concrete external wall panel 1 and the steel frame. It is a four-point external hanging type, including a friction energy dissipation connection node unit connected to the top beam of the steel frame and a load-bearing connection node unit connected to the bottom beam of the steel frame.
[0005] The friction energy dissipation connection node unit includes a box damper and a steel frame connector. The box damper and the steel frame connector are connected by a friction chain rod. The box damper is embedded in the precast concrete outer wall panel. The friction chain rod is arranged vertically, parallel to the precast concrete outer wall panel, and perpendicular to the top beam of the steel frame.
[0006] The two friction energy dissipation connection node units and the two load-bearing connection node units are arranged in a 2×2 matrix.
[0007] The horizontal edge of the steel frame connector is welded and fixed to the lower part of the upper flange of the steel frame top beam. The box damper is connected to the vertical edge of the steel frame connector to achieve sliding friction in the vertical direction. Friction plates are provided on both sides of the end of the friction chain rod connected to the box damper to achieve rotational friction in the horizontal direction. The box damper is connected to the precast concrete exterior wall panel.
[0008] A strip-shaped hole is provided on the side of the steel frame connector that is connected to the friction chain rod along the height direction. The connection end of the friction chain rod and the steel frame connector is located in the middle of the strip-shaped hole, so as to realize sliding friction in the vertical direction and provide displacement range for rotational friction in the horizontal direction.
[0009] The friction chain rods are symmetrically arranged on both sides of the steel frame connector.
[0010] The box-type damper is provided with anchoring steel bars on the box body, which are embedded in the precast concrete exterior wall panel.
[0011] The steel frame connectors are angle steel, and stiffening ribs are provided inside the angle steel.
[0012] The load-bearing connection node unit serves as a load-bearing connection node, including a load-bearing connector. The two mutually perpendicular sides of the load-bearing connector are respectively connected to the upper flange of the precast concrete exterior wall panel and the bottom beam of the steel frame.
[0013] The load-bearing connector is semi-enclosed, with an internal cavity containing reinforcing ribs.
[0014] One side of the load-bearing connector is connected and fixed to a pre-embedded bolt rod embedded in the precast concrete exterior wall panel, and the other side is welded and fixed to the upper flange of the steel frame bottom beam.
[0015] By employing the above technical solution, this utility model application has at least the following beneficial effects:
[0016] This utility model is a fully prefabricated structure, which is convenient for on-site construction and requires less construction work. Under minor earthquakes, the entire device enhances the additional stiffness of the main structure through the structural design of box-type dampers, friction plates, and friction chain rods, thereby shortening the basic natural vibration period of the structure and achieving deformation control. Under major earthquakes, the rotating friction energy dissipation connection node overcomes the critical friction force and enters a sliding state through the sliding action of the friction chain rod and angle steel. At this time, the entire device continuously consumes the seismic input energy through friction energy dissipation, thereby protecting the external wall panel from damage. It has high safety, conforms to the prefabricated concept, and is suitable for widespread application.
[0017] This utility model pertains to an energy-dissipating connection, requiring the pre-embedding of some box-type dampers and bolt rods into the external wall panel at the factory, thus significantly reducing on-site operations. The utility model utilizes high-strength bolts to apply pre-tightening force, causing the box-type dampers, friction plates, friction chain rods, and angle steel to press against each other. Under external force, the frictional energy dissipation of each component weakens the deformation and damage to the external wall panel caused by an earthquake, thereby protecting the external wall panel from damage under seismic loads. The frictional energy-dissipating part of this structure consists of two parts: the box-type damper connects to the vertical edge of the steel frame connector, achieving vertical sliding friction; friction plates are installed on both sides of the end of the friction chain rod connected to the box-type damper, achieving horizontal rotational friction. Rotational friction primarily dissipates horizontal forces, while sliding friction primarily dissipates vertical forces and the deformation of the steel frame.
[0018] This invention can effectively improve the deformation of external wall panels and has a good energy consumption effect. Attached Figure Description
[0019] Figure 1 A schematic diagram of the rotating friction energy dissipation connection node of the prefabricated external wall panel provided by this utility model;
[0020] Figure 2 This is a schematic diagram of a precast concrete exterior wall panel using the connection node of this utility model.
[0021] Figure 3 A schematic diagram of the friction energy dissipation connection node unit in the rotary friction energy dissipation connection node of the prefabricated external wall panel provided by this utility model;
[0022] Figure 4 for Figure 3 Exploded view;
[0023] Figure 5 A schematic diagram of the welding of the box damper and the anchoring steel bar in the rotating friction energy dissipation connection node of the prefabricated external wall panel provided by this utility model.
[0024] Figure 6 A schematic diagram of the box-type damper in the rotating friction energy dissipation connection node of the prefabricated external wall panel provided by this utility model.
[0025] Figure 7 A schematic diagram of the load-bearing connection node unit in the rotating friction energy dissipation connection node of the prefabricated external wall panel provided by this utility model;
[0026] In the picture:
[0027] 1. Precast concrete exterior wall panel, 1-1 box damper, 1-1-1 box body, 1-2 anchoring steel bar, 1-3 embedded bolt rod, 2. steel frame top beam, 2-1 angle steel, 2-1-1 stiffening rib, 2-2 steel frame bottom beam, 2-2-1 load-bearing connector, 3. friction chain rod, 3-1 friction plate, 3-2 high-strength bolt I, 3-3 high-strength bolt II. Detailed Implementation
[0028] To better explain and facilitate understanding of this utility model, the technical solution and effects of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] like Figures 1-7 As shown, a prefabricated external wall panel rotating friction energy dissipation connection node is connected between the precast concrete external wall panel 1 and the steel frame. It is a four-point external hanging structure, including friction energy dissipation connection node units and load-bearing connection node units set at the top and bottom.
[0030] In this embodiment, a prefabricated external wall panel rotational friction-dissipating connection node is provided between the precast concrete external wall panel 1 and the steel frame. It includes friction-dissipating connection node units and load-bearing connection node units arranged vertically opposite each other. Two of the friction-dissipating connection node units and two of the load-bearing connection node units are arranged in a 2×2 matrix, forming a four-point external connection structure. Two friction-dissipating connection node units are located at the upper part, and two load-bearing connection node units are located at the lower part, supporting the fixing of the wall panel and the self-weight of the wall panel. The upper and lower node units work together to ensure that the wall panel does not detach.
[0031] The friction energy dissipation connection node unit includes a box-type damper 1-1 and a steel frame connector. The box-type damper 1-1 and the steel frame connector are connected by a friction chain rod 3. Both ends of the friction chain rod 3 have connecting through holes for bolt connection, thus achieving connection with the box-type damper 1-1 and the steel frame connector. The friction chain rod 3 is arranged vertically, parallel to the precast concrete exterior wall panel 1 and perpendicular to the steel frame top beam 2. The box-type damper 1-1 is fixedly connected to the precast concrete exterior wall panel 1, and the steel frame connector is welded and fixed to the lower part of the upper flange of the steel frame top beam 2.
[0032] In this embodiment, the friction energy dissipation connection node unit includes a box-type damper 1-1 and a steel frame connector. The steel frame connector uses angle steel 2-1, and the horizontal side of angle steel 2-1 is welded and fixed to the lower part of the upper flange of the top beam 2 of the steel frame. The box-type damper 1-1 is connected to the vertical side of angle steel 2-1 through a friction chain rod 3 to achieve sliding friction in the vertical direction. A strip-shaped hole is opened along the height direction on the side of angle steel 2-1 connected to the friction chain rod 3. Two strip-shaped holes are arranged symmetrically side by side to achieve sliding friction in the vertical direction and provide displacement range for rotational friction in the horizontal direction. One end of the friction chain rod 3 is connected to the angle steel 2-1 through a high-strength bolt II 3-3 that engages with the strip-shaped hole. The connection end of the friction chain rod 3 with the angle steel 2-1 is located in the middle of the strip-shaped hole, that is, the high-strength bolt II 3-3 is locked in the middle of the strip-shaped hole to ensure that the chain rod has room to move upward when deformation occurs under seismic action. The box-type damper 1-1 has an open structure with one side unclosed, the unclosed end being used for connection with the friction chain rod 3. The friction chain rod 3 is connected to the box-type damper 1-1 via high-strength bolts I 3-2. To maximize frictional energy dissipation, the friction chain rod 3 is symmetrically arranged on both sides of one side of the angle steel 2-1. Friction plates 3-1 are provided on both sides of the end of the friction chain rod 3 connected to the box-type damper 1-1. The friction plates 3-1 are coaxially arranged with the connecting through holes, separating the friction chain rod 3 from the nuts and bolts I 3-2, achieving horizontal rotational friction. The opening size of the friction plates 3-1 is the same as the connecting through hole size of the friction chain rod 3. Anchor steel bars 1-2 are provided on the box-type damper 1-1 for connection and fixation with the precast concrete exterior wall panel 1.
[0033] The angle steel 2-1 has two stiffening ribs 2-1-1 welded inside to further improve stability and strength. The stiffening ribs 2-1-1 are welded to the upper inner side of the angle steel 2-1 to prevent excessive bending moment at the angle steel 2-1 from causing deformation.
[0034] The box-type damper 1-1 is pre-embedded in the precast concrete exterior wall panel 1 by anchoring steel bars 1-2. The anchoring steel bars 1-2 are pre-embedded in the precast concrete exterior wall panel 1, and the box-type damper 1-1 is attached to the surface of the precast concrete exterior wall panel 1. It is used to connect and fix to the steel frame through steel frame connectors and friction chain rods 3. The anchoring steel bars 1-2 are L-shaped and arranged in two rows with two bars in each row in a direction perpendicular to the top beam 2 of the steel frame. They are welded and fixed to the box-type damper 1-1.
[0035] The box-type damper 1-1 has a box body 1-1-1 with a plurality of parallel protruding connecting ends for bolt connection with two friction chain rods 3 and friction plates 3-1.
[0036] The load-bearing connection node unit serves as a load-bearing connection node, including a load-bearing connector 2-2-1. The two mutually perpendicular sides of the load-bearing connector 2-2-1 are respectively connected to the upper flanges of the precast concrete exterior wall panel 1 and the steel frame bottom beam 2-2.
[0037] In this embodiment, the load-bearing connection node unit includes a semi-enclosed load-bearing connector 2-2-1, with an internal cavity containing reinforcing ribs. The load-bearing connector 2-2-1 is a box-type structure, including two enclosed sides. One side is connected and fixed to a pre-embedded bolt rod 1-3 embedded in the precast concrete exterior wall panel 1, and the other side is welded and fixed to the upper flange of the steel frame bottom beam 2-2.
[0038] The construction method for the aforementioned rotating friction energy-dissipating connection node of prefabricated external wall panels is as follows:
[0039] Fabrication of precast concrete exterior wall panel 1: During the prefabrication process, the anchoring steel bars 1-2 of the box damper 1-1, the side of the box body 1-1-1 of the box damper 1-1 connected to the anchoring steel bars 1-2, and the pre-embedded bolt rods 1-3 for connecting and fixing the load-bearing connector 2-2-1 are pre-embedded.
[0040] Connect the precast concrete exterior wall panel 1 to the steel frame:
[0041] Angle steel 2-1 is welded and fixed to the lower part of the upper flange of the steel frame top beam 2. Then, high-strength bolts are used to connect the two ends of friction chain rod 3 to the box damper 1-1 embedded in the precast concrete outer wall panel 1 and the angle steel 2-1 welded to the steel frame, respectively. Friction plate 3-1 is set between the protruding connecting end of the box part 1-1-1 of the box damper 1-1 and the friction chain rod 3.
[0042] Weld and fix the load-bearing connector 2-2-1 to the upper flange of the bottom beam 2-2 of the steel frame, and then connect the load-bearing connector 2-2-1 to the pre-embedded bolt rod 1-3 to the precast concrete exterior wall panel 1.
[0043] Under the external force generated by the earthquake, the friction chain rod 3 and the angle steel 2-1 between the steel frame top beam 2 slide, realizing vertical sliding friction, dissipating the vertical force and the deformation of the steel frame; the friction chain rod 3 and the box damper 1-1 and friction plate 3-1 between the precast concrete outer wall panel 1 rotate, realizing horizontal rotational friction, dissipating the horizontal force, thereby effectively improving the deformation of the precast concrete outer wall panel 1.
Claims
1. A fabricated exterior wall panel rotational type friction energy dissipation connection joint, characterized in that: The connecting structure is four-point externally hung, including a friction energy dissipation connecting joint unit connected to the top beam of the steel frame and a load-bearing connecting joint unit connected to the bottom beam of the steel frame. The friction energy dissipation connecting joint unit comprises a box damper and a steel frame connecting piece, and the box damper and the steel frame connecting piece are connected through a friction chain rod.
2. The assembled outer hanging wallboard rotating type friction energy dissipation connecting joint of claim 1, wherein: The two friction energy dissipation connecting joint units and the two load-bearing connecting joint units are arranged in a 2*2 matrix.
3. The assembled outer hanging wallboard rotary type friction energy dissipation connecting joint according to claim 1, characterized in that: The horizontal side of the steel frame connecting piece is welded and fixed to the lower part of the upper flange of the top beam of the steel frame, the box damper is connected to the vertical side of the steel frame connecting piece to realize vertical sliding friction, the two sides of the end of the friction chain rod connected to the box damper are provided with friction plates to realize horizontal rotational friction, and the box damper is connected to the prefabricated concrete externally hung wall panel.
4. The assembled outer hanging wallboard rotating type friction energy dissipation connecting joint of claim 3, characterized in that: The steel frame connecting piece is provided with a strip-shaped hole in the height direction on one side connected to the friction chain rod, and the connecting end of the friction chain rod to the steel frame connecting piece is located in the middle of the strip-shaped hole to provide displacement range for vertical sliding friction and horizontal rotational friction.
5. The assembled external wall panel rotary type friction energy dissipation connecting joint according to claim 3, characterized in that: The friction chain rod is symmetrically arranged on both sides of the steel frame connecting piece.
6. The assembled external wall panel rotary type friction energy dissipation connecting joint according to claim 3, characterized in that: The box damper is provided with an anchoring steel bar on the box body part, and the anchoring steel bar is pre-buried in the prefabricated concrete externally hung wall panel.
7. The assembled external wall panel rotary type friction energy dissipation connecting joint according to claim 3, characterized in that: The steel frame connecting piece is an angle steel, and the angle steel is provided with a stiffening rib inside.
8. The assembled exterior wall panel rotary type friction energy dissipation connecting joint according to claim 1, characterized in that: The load-bearing connecting joint unit is a load-bearing connecting joint, comprising a load-bearing connecting piece, and two mutually perpendicular sides of the load-bearing connecting piece are connected to the prefabricated concrete externally hung wall panel and the upper flange of the bottom beam of the steel frame, respectively.
9. The assembled external wall panel rotary type friction energy dissipation connecting joint according to claim 8, characterized in that: The load-bearing connecting piece is semi-closed and has a cavity with a reinforcing rib inside.
10. The assembled exterior wall panel swivel type friction energy dissipation connecting joint according to claim 8, characterized in that: One side of the load-bearing connecting piece is connected and fixed to a pre-buried bolt rod pre-buried in the prefabricated concrete externally hung wall panel, and the other side is welded and fixed to the upper flange of the bottom beam of the steel frame.