Assembly type external wall panel rotating type friction energy dissipation connecting joint and construction method

Abstract

The invention relates to a rotary friction energy consumption connecting joint of an assembly type external wall panel and a construction method, and belongs to the technical field of assembly type buildings, the rotary friction energy consumption connecting joint is connected between a prefabricated concrete external wall panel and a steel frame in a four-point external hanging mode, and the rotary friction energy consumption connecting joint comprises a friction energy consumption connecting joint unit and a bearing connecting joint unit which are arranged up and down; the bearing connection node unit is connected to the steel frame bottom beam. The friction energy dissipation connecting joint unit comprises a box type damper and a steel frame connecting piece, the box type damper and the steel frame connecting piece are connected through a friction chain rod, the horizontal edge of the steel frame connecting piece is fixedly welded to the lower portion of the upper flange of the steel frame top beam, and the box type damper is connected with the vertical edge of the steel frame connecting piece. Sliding friction in the vertical direction is realized; friction plates are arranged on the two sides of the end, connected with the box type damper, of the friction chain rod, and rotating friction in the horizontal direction is achieved. And the box type damper is connected with the precast concrete externally-hung wall plate. Deformation of the external wall panel can be effectively improved, and a good energy consumption effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of prefabricated buildings, and particularly relates to a rotational friction energy dissipation connection node for prefabricated external wall panels and a construction method thereof. Background Art

[0002] Prefabricated buildings are a new type of building production method that promotes buildings to reduce energy consumption, reduce environmental pollution, and maximize the full-cycle value. As an important part of prefabricated buildings, the connection method between precast concrete external wall panels and the main structure has a significant impact on the mechanical properties and seismic performance of the overall structure of prefabricated buildings. When connecting precast concrete external wall panels to a steel frame, rigid connection nodes or flexible connection nodes are usually used. Under earthquake action, although rigid connection nodes can provide greater lateral stiffness and bearing capacity for the main structure, the external concrete wall panels are prone to cracking. Flexible connection nodes can ensure that the external wall panels do not deform with the main structure, effectively avoiding secondary disasters caused by wall damage. However, the strength and stiffness of the external wall panels are not reasonably utilized, and the economy is poor. The friction energy dissipation connection structure combines the advantages of rigid connection nodes and flexible connection nodes, and has better comprehensive performance. For some existing friction dampers, when applied to a structure, the pressure between the dampers increases due to coordinated deformation following the structure, resulting in an increase in friction force and hindering the energy dissipation of the structure. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the present invention provides a rotational friction energy dissipation connection node for prefabricated external wall panels and a construction method thereof. The four-point external connection method is adopted for the connection between precast concrete external wall panels and a steel frame, which can effectively improve the deformation of the external wall panels and has good energy dissipation effects.

[0004] A rotational friction energy dissipation connection node for prefabricated external wall panels is four-point externally connected between a precast concrete external wall panel 1 and a steel frame, and includes a friction energy dissipation connection node unit and a load-bearing connection node unit arranged up and down. The load-bearing connection node unit is connected to the bottom beam of the steel frame.

[0005] The two friction energy dissipation connection node units and the two load-bearing connection node units are arranged in a 2×2 matrix.

[0006] The friction energy dissipation connection node unit includes a box-type damper and a steel frame connector. The box-type damper and the steel frame connector are connected by a friction link rod. The horizontal side 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-type damper is connected to the vertical side of the steel frame connector to achieve sliding friction in the vertical direction. Friction plates are arranged on both sides of one end of the friction link rod connected to the box-type damper to achieve rotational friction in the horizontal direction. The box-type damper is connected to the precast concrete external wall panel.

[0007] On one side of the steel frame connector connected to the friction link rod, a strip-shaped hole is opened along the height direction. The connection end of the friction link rod with the steel frame connector is located in the middle of the strip-shaped hole, realizing sliding friction in the vertical direction and providing a displacement range for rotational friction in the horizontal direction.

[0008] The friction link rods are symmetrically arranged on both sides of the steel frame connector.

[0009] Anchoring steel bars are provided on the box body part of the box-type damper, and the anchoring steel bars are embedded in the precast concrete exterior wall panel.

[0010] The load-bearing connection node unit serves as a load-bearing connection node and includes a load-bearing connector. Two mutually perpendicular side surfaces of the load-bearing connector are respectively connected to the upper flange of the precast concrete exterior wall panel and the steel frame bottom beam.

[0011] The load-bearing connector is semi-enclosed, and the interior is a cavity with reinforcing ribs.

[0012] One side surface of the load-bearing connector is fixedly connected to the embedded bolt rod embedded in the precast concrete exterior wall panel, and the other side surface is fixedly welded to the upper flange of the steel frame bottom beam.

[0013] The construction method of the above-mentioned assembled exterior wall panel rotational friction energy dissipation connection node is as follows:

[0014] Manufacture the precast concrete exterior wall panel: During the precast process, embed the box-type damper of the friction energy dissipation connection node unit and the embedded bolt rod for the connection and fixation of the load-bearing connection node unit.

[0015] Connect the precast concrete exterior wall panel to the steel frame:

[0016] Weld the horizontal side of the steel frame connector to the lower part of the upper flange of the steel frame top beam, and then use high-strength bolts to connect the two ends of the friction link rod to the box-type damper embedded in the precast concrete exterior wall panel and the steel frame connector welded to the steel frame top beam respectively, and set friction plates between the box body part of the box-type damper and the friction link rod.

[0017] Weld the load-bearing connector to the upper flange of the steel frame bottom beam, and then cooperate the load-bearing connector with the embedded bolt rod to realize the connection with the precast concrete exterior wall panel.

[0018] By means of the above technical solutions, the invention of this application has at least the following beneficial effects:

[0019] The present invention is a fully prefabricated structure, which is convenient for on-site construction and has less construction volume. Under minor earthquakes, through the structural design of the cassette damper, friction plate and friction link rod, the additional stiffness of the main structure is enhanced to shorten the basic natural vibration period of the structure, thereby achieving deformation control. Under major earthquakes, the rotational friction energy dissipation connection node overcomes the critical friction force and enters the sliding state through the sliding action of the friction link rod and the angle steel. At this time, the whole device continuously dissipates the earthquake input energy through friction energy dissipation, thereby protecting the external wall panel from damage, having high safety, conforming to the concept of prefabrication, and being suitable for popularization and application.

[0020] The present invention belongs to an energy dissipation type connection. It is necessary to pre-embed part of the cassette damper and bolt rod into the external wall panel in the factory, which also greatly reduces on-site operations. The invention applies a pre-tightening force through high-strength bolts, so that the cassette damper, friction plate, friction link rod and angle steel are mutually extruded. When an external force acts, the friction energy dissipation of each component weakens the deformation and damage caused by the earthquake to the external wall panel, thereby protecting the external wall panel from damage under earthquake action. The friction energy dissipation part of this structure consists of two parts. The cassette damper is connected to the vertical side of the steel frame connector to achieve sliding friction in the vertical direction. Friction plates are arranged on both sides of one end of the friction link rod connected to the cassette damper to achieve rotational friction in the horizontal direction. The rotational friction mainly dissipates the horizontal direction acting force, and the sliding friction is mainly used to dissipate the vertical direction acting force and the deformation of the steel frame.

[0021] The present invention can effectively improve the deformation of the external wall panel and has good energy dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an overall schematic diagram of the rotational friction energy dissipation connection node of the prefabricated external wall panel provided by the present invention;

[0023] Figure 2 is a schematic diagram of a part of the precast concrete external wall panel using the connection node of the present invention;

[0024] Figure 3 is a schematic diagram of the friction energy dissipation connection node unit in the rotational friction energy dissipation connection node of the prefabricated external wall panel provided by the present invention;

[0025] Figure 4 is Figure 3 exploded view;

[0026] Figure 5 is a structural schematic diagram of the welding of the cassette damper and the anchor reinforcement in the rotational friction energy dissipation connection node of the prefabricated external wall panel provided by the present invention;

[0027] Figure 6Schematic diagram of the cassette damper in the rotational friction energy dissipation connection node of the prefabricated external wall panel provided by the present invention;

[0028] Figure 7 Schematic diagram of the load-bearing connection node unit in the rotational friction energy dissipation connection node of the prefabricated external wall panel provided by the present invention;

[0029] In the figure:

[0030] 1 Prefabricated concrete external wall panel, 1-1 Cassette damper, 1-1-1 Cassette body part, 1-2 Anchor reinforcement, 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 connecting piece, 3 Friction link rod, 3-1 Friction plate, 3-2 High-strength bolt I, 3-3 High-strength bolt II. Specific implementation manner

[0031] In order to better explain the present invention for easy understanding, the technical solutions and effects of the present invention will be described in detail below in conjunction with the drawings through specific implementation manners.

[0032] As Figures 1 - 7 shown, a rotational friction energy dissipation connection node of a prefabricated external wall panel is connected between the prefabricated concrete external wall panel 1 and the steel frame, and is a four-point external hanging structure, including a friction energy dissipation connection node unit and a load-bearing connection node unit arranged up and down.

[0033] In this embodiment, a rotational friction energy dissipation connection node of a prefabricated external wall panel connected between the prefabricated concrete external wall panel 1 and the steel frame is provided, including a friction energy dissipation connection node unit and a load-bearing connection node unit arranged oppositely up and down. The two friction energy dissipation connection node units and the two load-bearing connection node units are arranged in a 2×2 matrix to form a four-point external hanging connection structure. Among them, 2 friction energy dissipation connection node units are located in the upper part, and 2 nodes are load-bearing connection node units located in the lower part, which bear the fixed 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 fall off.

[0034] The friction energy dissipation connection node unit includes a cassette damper 1-1 and a steel frame connecting piece. The cassette damper 1-1 and the steel frame connecting piece are connected by a friction link rod 3. Both ends of the friction link rod 3 are respectively provided with connection through holes for bolt connection to realize the connection with the cassette damper 1-1 and the steel frame connecting piece. The friction link rod 3 is arranged vertically, parallel to the prefabricated concrete external wall panel 1 and perpendicular to the steel frame top beam 2. The cassette damper 1-1 is fixedly connected to the prefabricated concrete external wall panel 1, and the steel frame connecting piece is fixedly welded to the lower part of the upper flange of the steel frame top beam 2.

[0035] In this embodiment, the friction energy dissipation connection node unit includes a box damper 1-1 and a steel frame connector. The steel frame connector is made of an angle steel 2-1. The horizontal side of the 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 damper 1-1 is connected to the vertical side of the angle steel 2-1 through a friction link rod 3 to achieve sliding friction in the vertical direction. A strip hole is opened along the height direction on one side of the angle steel 2-1 connected to the friction link rod 3. Two strip holes are arranged symmetrically side by side to achieve sliding friction in the vertical direction and provide a displacement range for rotational friction in the horizontal direction. One end of the friction link rod 3 is connected to the angle steel 2-1 through a high-strength bolt II 3-3 in cooperation with the strip hole. The connection end of the friction link rod 3 and the angle steel 2-1 is located in the middle of the strip hole, that is, the high-strength bolt II 3-3 is locked in the middle of the strip hole to ensure that the link rod has space to move upward when deformed under earthquake action. The box body part 1-1-1 of the box damper 1-1 is an open structure with one side not closed, and the unclosed end is used for connection with the friction link rod 3. The friction link rod 3 is connected to the box body part 1-1-1 of the box damper 1-1 through a high-strength bolt I 3-2. In order to maximize friction energy dissipation, the friction link rods 3 are symmetrically arranged on both sides of one side of the angle steel 2-1. Friction plates 3-1 are arranged on both sides of the end of the friction link rod 3 connected to the box damper 1-1. The friction plates 3-1 are coaxially arranged with the connection through holes, separating the nut and the nut of the friction link rod 3 and the high-strength bolt I 3-2 to achieve rotational friction in the horizontal direction. The opening size of the friction plates 3-1 is the same as the size of the connection through holes of the friction link rod 3. Anchor bars 1-2 are arranged on the box body part 1-1-1 of the box damper 1-1 for connection and fixation with the precast concrete external wall panel 1.

[0036] Wherein, two stiffeners 2-1-1 are welded inside the angle steel 2-1 to further improve stability and strength. The stiffeners 2-1-1 are welded to the upper part of the inner side of the angle steel 2-1 to prevent excessive bending moment at the angle steel 2-1 from causing deformation of the angle steel 2-1.

[0037] The box damper 1-1 is embedded in the precast concrete external wall panel 1 through the anchor bars 1-2. The anchor bars 1-2 are embedded in the precast concrete external wall panel 1, and the box damper 1-1 is attached to the surface of the precast concrete external wall panel 1 for connection and fixation with the steel frame through the steel frame connector and the friction link rod 3. The anchor bars 1-2 are L-shaped, arranged in two rows in the direction perpendicular to the top beam 2 of the steel frame, with two in each row, and are welded and fixed to the box damper 1-1.

[0038] The box body part 1-1-1 of the box damper 1-1 is provided with a plurality of protruding connection ends arranged side by side for bolt connection with two friction link rods 3 and friction plates 3-1.

[0039] The load-bearing connection node unit, as a load-bearing connection node, includes a load-bearing connecting member 2-2-1. Two mutually perpendicular side surfaces of the load-bearing connecting member 2-2-1 are respectively connected to the upper flange of the precast concrete exterior wall panel 1 and the steel frame bottom beam 2-2.

[0040] In this embodiment, the load-bearing connection node unit includes a semi-closed load-bearing connecting member 2-2-1 with a cavity with reinforcing ribs inside. The load-bearing connecting member 2-2-1 is a box structure, including two closed side surfaces. One side surface is fixedly connected to the embedded bolt rod 1-3 embedded in the precast concrete exterior wall panel 1, and the other side surface is fixedly welded to the upper flange of the steel frame bottom beam 2-2.

[0041] The construction method of the above-mentioned assembled exterior wall panel rotational friction energy dissipation connection node is as follows:

[0042] Manufacture the precast concrete exterior wall panel 1: During the precast process, embed the anchoring steel bars 1-2 of the box-type damper 1-1, the side surface of the box body part 1-1-1 of the box-type damper 1-1 connected to the anchoring steel bars 1-2, and the embedded bolt rod 1-3 for connecting and fixing the load-bearing connecting member 2-2-1.

[0043] Connect the precast concrete exterior wall panel 1 with the steel frame:

[0044] Weld the angle steel 2-1 to the lower part of the upper flange of the steel frame top beam 2, and then use high-strength bolts to connect the two ends of the friction link rod 3 to the box-type damper 1-1 embedded in the precast concrete exterior wall panel 1 and the angle steel 2-1 welded on the steel frame respectively, and set a friction plate 3-1 between the protruding connection end of the box body part 1-1-1 of the box-type damper 1-1 and the friction link rod 3.

[0045] Weld the load-bearing connecting member 2-2-1 to the upper flange of the steel frame bottom beam 2-2, and then cooperate the load-bearing connecting member 2-2-1 with the embedded bolt rod 1-3 to realize the connection with the precast concrete exterior wall panel 1.

[0046] Under the external force generated by the earthquake, a sliding action occurs between the friction link rod 3 and the angle steel 2-1 between the steel frame top beam 2, realizing vertical sliding friction and dissipating the vertical acting force and the deformation of the steel frame; rotation occurs between the box-type damper 1-1 and the friction plate 3-1 between the friction link rod 3 and the precast concrete exterior wall panel 1, realizing horizontal rotational friction and dissipating the horizontal acting force, thereby effectively improving the deformation of the precast concrete exterior wall panel 1.

Claims

1. A rotary friction energy dissipation connection node of an assembled external wall panel, characterized in that: The four-point external connection is between the precast concrete external wall panel 1 and the steel frame, and includes friction energy dissipation connection node units and load-bearing connection node units arranged above and below, and the load-bearing connection node units are connected to the bottom beam of the steel frame.

2. The assembled external wall panel rotating friction energy dissipation connection node according to claim 1 is characterized in that: The two friction energy dissipation connection node units and the two load-bearing connection node units are arranged in a 2×2 matrix.

3. The assembled external wall panel rotating friction energy dissipation connection node according to claim 1 is characterized in that: 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 horizontal side of the steel frame connector is welded and fixed to the lower part of the upper flange of the steel frame top beam, and the box damper is connected to the vertical side of the steel frame connector to achieve sliding friction in the vertical direction; friction plates are provided on both sides of one end where the friction chain rod is connected to the box damper to achieve rotational friction in the horizontal direction; the box damper is connected to the precast concrete external wall panel.

4. The assembled external wall panel rotating friction energy dissipation connection node according to claim 3 is characterized by: A strip hole is opened in the height direction on one side where the steel frame connecting piece is connected to the friction chain rod, and the connection end of the friction chain rod with the steel frame connecting piece is located in the middle of the strip hole, realizing sliding friction in the vertical direction and providing a displacement range for rotational friction in the horizontal direction.

5. The assembled external wall panel rotating friction energy dissipation connection node according to claim 3 is characterized by: The friction chain rods are symmetrically arranged on both sides of the steel frame connecting piece.

6. The assembled external wall panel rotating friction energy dissipation connection node according to claim 3 is characterized by: Anchoring steel bars are arranged on the box body of the box-type damper, and the anchoring steel bars are embedded in the precast concrete external wall panels.

7. The assembled external wall panel rotating friction energy dissipation connection node according to claim 1 is characterized by: The load-bearing connection node unit serves as a load-bearing connection node and includes a load-bearing connection member, and two mutually perpendicular side surfaces of the load-bearing connection member are respectively connected to the upper flanges of the precast concrete external wall panel and the steel frame bottom beam.

8. The assembled external wall panel rotating friction energy dissipation connection node according to claim 7 is characterized in that: The load-bearing connecting piece is semi-enclosed, and the interior is a cavity with reinforcing ribs.

9. The assembled external wall panel rotating friction energy dissipation connection node according to claim 7 is characterized by: One side surface of the load-bearing connector is connected and fixed to a pre-embedded bolt rod pre-embedded in a precast concrete external wall panel, and the other side surface is welded and fixed to an upper flange of a bottom beam of a steel frame.

10. A construction method for a rotary friction energy dissipation connection node of an assembled external wall panel according to any one of claims 1 to 9, characterized in that: The details are as follows: Making precast concrete exterior wall panels: During the precast process, pre-embed the box damper of the friction energy dissipation connection node unit and the pre-embedded bolt rod for connecting and fixing the load-bearing connection node unit; Connecting precast concrete cladding panels to steel frames: The horizontal side of the steel frame connector is welded and fixed to the lower part of the upper flange of the steel frame top beam, and then the two ends of the friction chain rod are respectively connected to the box damper embedded in the precast concrete external wall panel and the steel frame connector welded on the steel frame top beam by high-strength bolts, and a friction plate is arranged between the box body part of the box damper and the friction chain rod; The load-bearing connector is welded and fixed to the upper flange of the steel frame bottom beam, and then the load-bearing connector is matched with the embedded bolt rod to achieve connection with the precast concrete external wall panel.

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