Precast concrete frame structure having energy-dissipating connection

Abstract

The present application relates to the technical field of building construction, and in particular to a precast concrete frame structure having an energy-dissipating connection, comprising precast columns and a precast beam connected to the precast columns. A column curved-web connection apparatus is mounted on a side surface of each precast column, and a beam curved-web connection apparatus is mounted on each end of the precast beam; the column curved-web connection apparatus and the beam curved-web connection apparatus each have an inwards-recessed arced surface, the opposing arced surfaces abut against each other to define a cylindrical cavity, and a damping mechanism is provided in the cylindrical cavity; and first elongated holes are formed in each of the opposing arced surfaces, first fastening bolts are provided in the first elongated holes, and the damping mechanism is fixedly connected to the first fastening bolts. When connection joints between the precast columns and the precast beam rotate, energy can be dissipated by means of friction between the opposing arced surfaces, and the rotation performance of the joints is improved.

Description

Energy-dissipating connection prefabricated concrete frame structure Technical Field

[0001] This application relates to the field of building construction technology, specifically to an energy-dissipating connected prefabricated concrete frame structure. Background Technology

[0002] Precast concrete beams and columns are generally connected by methods such as grouting sleeves for reinforcing bars. The connection method is relatively complex. In the event of an earthquake, if the concrete at the beam end is damaged, crushed, or the reinforcing bars buckle, it will be detrimental to post-earthquake repair. Application content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an energy-dissipating connected prefabricated concrete frame structure.

[0004] The technical solution adopted by this application to solve its technical problem is:

[0005] An energy-dissipating prefabricated concrete frame structure includes precast columns and assembled beams connected to the precast columns. A column circular web connecting device is installed on the side of the precast column, and a beam circular web connecting device is installed at the end of the assembled beam. Both the column circular web connecting device and the beam circular web connecting device include concave arc surfaces. The two arc surfaces meet to form a columnar cavity, and a damping mechanism is installed inside the columnar cavity. A first elongated hole is opened on each of the two arc surfaces, and a first fastening bolt is installed in the first elongated hole. The damping mechanism is fixedly connected to the first fastening bolt.

[0006] As a preferred option, a further technical solution of this application is:

[0007] Preferably, the damping mechanism includes concentrically arranged inner column supports and outer ring supports, the outer ring supports are adapted to the cylindrical cavity, and damping units are arranged radially between the inner column supports and the outer ring supports;

[0008] The damping unit includes a support rod fixed to an inner column support. A first connecting rod is hinged to both sides of the support rod on the inner column support. A second connecting rod is hinged to the end of the first connecting rod. The end of the second connecting rod is hinged to the support rod. The first and second connecting rods on both sides form a quadrilateral structure. A third connecting rod is hinged between the hinge points of the first and second connecting rods on both sides. Support lugs are hinged to both sides of the outer end of the support rod. A fixed seat plate is provided between the ends of the support lugs. The fixed seat plate abuts against the inner side of the outer ring support. A first fastening bolt passes through the outer ring support and is fixed to the fixed seat plate. A spring is sleeved on the support rod between the second connecting rod and the support lugs.

[0009] Preferably, beam-column flange connecting devices are connected between the top and bottom surfaces of the column web connecting device and the beam web connecting device.

[0010] The beam-column flange connection device includes a first lower fixing plate and a first upper clamping plate fixed on the column web plate connection device. A connecting plate is clamped and fixed between the first lower fixing plate and the first upper clamping plate. A second lower fixing plate and a second upper clamping plate are clamped and fixed on the upper and lower sides of the connecting plate and fixed to the beam web plate connection device.

[0011] Preferably, the first lower fixing plate, the first upper clamping plate, and the connecting plate are all T-shaped plates.

[0012] Preferably, the through hole in the connecting plate for connecting with the first lower fixing plate and the first upper clamping plate is an elongated hole.

[0013] Preferably, the column web connection device and the beam web connection device have the same structure, including a C-shaped support body, with a stiffening plate provided in the middle of the inner side of the C-shaped support body, and the end of the stiffening plate is an arc shape adapted to the arc surface, with the arc surface located at the end of the C-shaped support body and the stiffening plate.

[0014] Preferably, a column foundation connection device is provided at the bottom of the precast column, which is used to fix the precast column to the foundation structure;

[0015] The column foundation connection device includes a bottom plate and a top plate arranged opposite each other. An irregularly shaped support is provided on the bottom plate, with the top of the irregularly shaped support abutting against the bottom surface of the top plate. A friction plate is provided on the bottom surface of the top plate that fits against the side of the irregularly shaped support. A C-shaped side plate is supported between the bottom plate and the top plate at the edge.

[0016] Preferably, the lower part of the irregular support body has a hollow structure, and a second elongated hole is opened opposite to the friction plate on the irregular support body. A second fastening bolt is installed in the second elongated hole to fasten the irregular support body and the friction plate.

[0017] Compared with the prior art, the present application, which adopts the above technical solution, has the following outstanding features: when the connection node between the precast column and the assembled beam rotates, it can dissipate energy through friction on both sides of the arc surface, while increasing the rotation performance of the node; the web damping structure is formed by using a quadrilateral linkage structure, spring, fixed seat plate and outer ring support. When the node rotates, it is first compressed by the spring, and then buckled to dissipate energy based on the quadrilateral linkage structure, which can effectively reduce energy dissipation during earthquakes; under seismic action, the friction plate and the side of the irregular support body rub against each other, and with the cooperation of the second elongated hole structure, sliding friction can be generated to effectively increase the shear resistance of the precast column; the setting of the C-shaped side plates around the perimeter helps to transfer the axial force of the precast column. Attached Figure Description

[0018] Figure 1 is a structural schematic diagram of the energy-dissipating connection prefabricated concrete frame structure in an embodiment of this application;

[0019] Figure 2 is a structural schematic diagram of the energy-dissipating connection prefabricated concrete frame structure in an embodiment of this application;

[0020] Figure 3 is a schematic diagram of the damping mechanism in an embodiment of this application;

[0021] Figure 4 is a schematic diagram of the damping mechanism in an embodiment of this application.

[0022] Figure 5 is a structural schematic diagram of the cylindrical web plate connecting device in an embodiment of this application;

[0023] Figure 6 is a structural schematic diagram of the beam-column flange connection device in an embodiment of this application;

[0024] Figure 7 is a structural schematic diagram of the column foundation connection device in an embodiment of this application;

[0025] Figure 8 is a schematic diagram of the column foundation connection device in an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Precast column; 2. Assembled beam; 3. Column web connection device; 4. Beam web connection device; 5. Arc surface; 6. Damping mechanism; 7. First elongated hole; 8. First fastening bolt; 9. Inner column support; 10. Outer ring support; 11. Damping unit; 12. Support rod; 13. First connecting rod; 14. Second connecting rod; 15. Third connecting rod; 16. Support ear plate; 17. Fixed seat plate; 18. Spring; 19. First lower fixed plate; 20. First upper clamping plate; 21. Connecting plate; 22. Second lower fixed plate; 23. Second upper clamping plate; 24. C-shaped support body; 25. Rib plate; 26. Column foundation connection device; 27. Base plate; 28. Top plate; 29. ​​Irregularly shaped support body; 30. Friction plate; 31. C-shaped side plate; 32. Second elongated hole; 33. Second fastening bolt. Detailed Implementation

[0027] The present application is further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the content of this application. Therefore, the examples given do not limit the scope of protection of this application.

[0028] As shown in Figures 1 to 8, this embodiment provides an energy-dissipating prefabricated concrete frame structure, including a precast column 1 and an assembled beam 2 connected to the precast column 1. A column circular web connecting device 3 is installed on the side of the precast column 1, and a beam circular web connecting device 4 is installed at the end of the assembled beam 2. Both the column circular web connecting device 3 and the beam circular web connecting device 4 include a concave arc surface 5. The two arc surfaces 5 are joined together to form a columnar cavity, and a damping mechanism 6 is provided in the columnar cavity. A first elongated hole 7 is opened on both arc surfaces 5, and a first fastening bolt 8 is provided in the first elongated hole 7. The damping mechanism 6 is fixedly connected to the first fastening bolt 8. When the connection node between the precast column 1 and the assembled beam 2 rotates, energy can be dissipated by friction of the two arc surfaces 5, while increasing the rotation performance of the node.

[0029] In practice, the column web plate connecting device 3 can be installed and fixed to the precast column 1 by the pre-embedded bolts in the precast column 1; the beam web plate connecting device 4 can be installed and fixed to the assembly beam 2 by the pre-embedded bolts in the assembly beam 2.

[0030] The damping mechanism 6 includes a concentric inner column support 9 and an outer ring support 10. The outer ring support 10 is adapted to the cylindrical cavity. Damping units 11 are arranged radially between the inner column support 9 and the outer ring support 10.

[0031] The damping unit 11 includes a support rod 12 fixed to the inner column support 9. First connecting rods 13 are hinged to the inner column support 9 on both sides of the support rod 12. A second connecting rod 14 is hinged to the end of the first connecting rod 13, and the end of the second connecting rod 14 is hinged to the support rod 12. The first connecting rods 13 and the second connecting rod 14 on both sides form a quadrilateral structure. A third connecting rod 15 is hinged between the hinge points of the first connecting rods 13 and the second connecting rod 14 on both sides. Support ear plates 16 are hinged to both sides of the outer end of the support rod 12. A fixed seat plate 17 is provided between the ends of the support ear plates 16. Plate 17 abuts against the inner side of outer ring support 10. The first fastening bolt 8 passes through outer ring support 10 and is fixed to fixed seat plate 17. A round hole adapted to the first fastening bolt 8 can be opened on outer ring support 10. A spring 18 is sleeved on support rod 12 and located between second connecting rod 14 and support ear plate 16. The quadrilateral connecting rod structure, spring 18, fixed seat plate 17 and outer ring support 10 constitute a web plate damping structure. When the node rotates, it is first compressed by spring 18 and then buckled and dissipated based on quadrilateral connecting rod structure, which can effectively reduce energy dissipation in earthquakes.

[0032] The precast column 1 is a square or rectangular cross-section precast concrete component. During production, high-strength connecting bolts are pre-embedded at the beam connection height position on the column body, with the bolt ends exposed, for fixing the column's circular web plate connecting device 3. During on-site installation, the precast column 1 is positioned and fixed to the building foundation through the bottom column foundation connecting device 26, and temporarily locked after the verticality is corrected; then the assembly beam 2 is hoisted to the connection height of the precast column 1, so that the beam's circular web plate connecting device 4 and the column's circular web plate connecting device 3 are precisely aligned.

[0033] The damping mechanism 6 adopts a concentric radial damping structure, with its core consisting of an inner column support 9, an outer ring support 10, and multiple sets of circumferentially evenly distributed damping units 11. The inner column support 9 is a solid steel column, and the outer ring support 10 is a thin-walled steel tube. The two are arranged coaxially to ensure uniform force distribution. In the damping unit 11, the support rod 12 is vertically fixed to the outer wall of the inner column support 9; the first link 13 and the second link 14 are hinged in sequence to form a buckling-deformable quadrilateral linkage mechanism. The third link 15 is hinged between the two sets of link hinge points to enhance the mechanism's coordinated deformation capability. A high-strength damping spring 18 is sleeved on the outside of the support rod 12. One end of the spring 18 presses against the second link 14, and the other end presses against the support ear plate 16. When the node is loaded, the spring 18 first dissipates energy elastically, and during large deformation, the linkage mechanism buckles and plastically dissipates energy, forming a graded energy dissipation mechanism. The supporting ear plate 16 is welded to the fixed seat plate 17 as a whole. The outer side of the fixed seat plate 17 is tightly fitted to the inner wall of the outer ring support 10. The first fastening bolt 8 passes through the outer ring support 10 and locks to the fixed seat plate 17, so as to stably transmit the damping force to the beam-column connection device.

[0034] During implementation, beam-column flange connecting devices are connected between the top and bottom surfaces of the column web connecting device 3 and the beam web connecting device 4.

[0035] The beam-column flange connection device includes a first lower fixing plate 19 and a first upper clamping plate 20 fixed on the column web plate connection device 3. A connecting plate 21 is clamped and fixed between the first lower fixing plate 19 and the first upper clamping plate 20. A second lower fixing plate 22 and a second upper clamping plate 23 are clamped and fixed on the upper and lower sides of the connecting plate 21 and fixed to the beam web plate connection device 4.

[0036] In practice, the first lower fixing plate 19, the first upper clamping plate 20, and the connecting plate 21 are all T-shaped plates. The through hole in the connecting plate 21 for connecting with the first lower fixing plate 19 and the first upper clamping plate 20 is an elongated hole.

[0037] A set of symmetrical beam-column flange connection devices are installed on the top and bottom surfaces of the column-web plate connection device 3 and the beam-web plate connection device 4, forming a composite connection system of "web plate energy dissipation + flange force transmission". The device consists of a first lower fixing plate 19, a first upper clamping plate 20, a connecting plate 21, a second lower fixing plate 22, and a second upper clamping plate 23. All fixing plates, clamping plates, and connecting plates are made of T-shaped steel plates. The T-shaped flanges increase the contact area and improve the force transmission stability. The first lower fixing plate 19 and the first upper clamping plate 20 are fixed to the upper and lower end faces of the column-web plate connection device 3 by bolts, and the two together clamp one end of the connecting plate 21; the other end of the connecting plate 21 is clamped by the second lower fixing plate 22 and the second upper clamping plate 23 and fixed to the upper and lower end faces of the beam-web plate connection device 4. The through hole on the connecting plate 21 that connects to the column side fixing plate is an oblong hole, which allows the connecting plate 21 to slide slightly along the hole direction and rotate in conjunction with the arc surface of the web, thus avoiding excessive connection rigidity that could lead to stress concentration.

[0038] In practice, the column web plate connecting device 3 and the beam web plate connecting device 4 have the same structure, including a C-shaped support body 24. A stiffening plate 25 is provided in the middle of the inner side of the C-shaped support body 24. The end of the stiffening plate 25 is an arc shape that matches the arc surface 5. The arc surface 5 is provided at the end of the C-shaped support body 24 and the stiffening plate 25. The first elongated hole 7 opened on the arc surface 5 is symmetrically arranged on both sides of the stiffening plate 25.

[0039] The column web connection device 3 and the beam web connection device 4 have the same structure, both consisting of a C-shaped support body 24, a central stiffener 25, and an inner concave arc surface 5. The C-shaped support body 24 is formed by bending steel plate, and the stiffener 25 is welded to the inner middle of the C-shaped body, with the ends ground into an arc shape, forming a continuous and smooth inner concave arc surface 5 together with the C-shaped body. The two arc surfaces 5 are joined together to form a complete cylindrical cavity, the inner diameter of which is consistent with the outer diameter of the outer ring support 10 of the damping mechanism 6, ensuring that the damping mechanism 6 can be stably embedded without radial sway. The two arc surfaces 5 are symmetrically provided with first elongated holes 7, which extend circumferentially along the arc surface, providing displacement space for node rotation. The first fastening bolt 8 passes through the first elongated hole 7 and is threadedly fastened to the fixed seat plate 17 of the damping mechanism 6. A sliding gap is reserved between the bolt and the elongated hole to allow normal rotation of the node.

[0040] During implementation, a column foundation connection device 26 is provided at the bottom of the precast column 1. The column foundation connection device 26 is used to fix the precast column 1 to the foundation structure. Specifically, the fixing can be completed by pre-embedded bolts in the foundation structure.

[0041] As shown in Figures 7 and 8, the column foundation connection device 26 includes a bottom plate 27 and a top plate 28 arranged opposite each other. A shaped support body 29 is provided on the bottom plate 27. The top of the shaped support body 29 abuts against the bottom surface of the top plate 28. A friction plate 30 is provided on the bottom surface of the top plate 28 and fits against the side of the shaped support body 29. A C-shaped side plate 31 is provided between the bottom plate 27 and the top plate 28 and at the edge position (the front C-shaped side plate 31 is not shown in Figures 7 and 8). The arrangement of the C-shaped side plates 31 around the perimeter helps to transmit the axial force of the precast column 1.

[0042] In implementation, the cross-section of the irregular support 29 is a structure with the apex of two isosceles triangles joined together. The lower part of the irregular support 29 is hollow. The irregular support 29 and the friction plate 30 have a second elongated hole 32 opposite to each other. The second elongated hole 32 is provided with a second fastening bolt 33, thereby fastening the irregular support 29 and the friction plate 30. The top surface of the top plate 28 is provided with a pre-embedded plate for pre-embedding in the precast column 1. The bottom plate 27 is fixed to the foundation structure by pre-embedded bolts in the foundation structure. Under seismic action, the friction plate 30 and the irregular support 29 rub against each other on the side. With the cooperation of the second elongated hole 32 structure, sliding friction can be generated to effectively increase the shear resistance of the precast column 1.

[0043] A column foundation connection device 26 is installed at the bottom of the precast column 1 to achieve a high-strength, energy-dissipating connection between the column and the building foundation, while improving the shear and seismic resistance of the column base. The device consists of a base plate 27, a top plate 28, a shaped support body 29, a friction plate 30, and C-shaped side plates 31. The base plate 27 is fixed to the building foundation by pre-embedded bolts. The top surface of the top plate 28 has a pre-embedded steel plate that is cast integrally with the bottom of the precast column 1. The shaped support body 29 is welded to the center of the base plate 27. Its cross-section is a vertically and horizontally isosceles triangle with the apex joined together. The lower part has a hollow structure to reduce its weight without reducing its rigidity. The friction plate 30 is welded to the bottom surface of the top plate 28. The inner side of the friction plate 30 is tightly fitted with the side of the shaped support body 29 to form a friction pair. The irregular support 29 and the friction plate 30 have corresponding second elongated holes 32. A second fastening bolt 33 passes through these holes to connect them. The bolt is not fully tightened, allowing for horizontal sliding. C-shaped side plates 31 are installed around the edges of the bottom plate 27 and the top plate 28. These C-shaped side plates 31 are welded to the top plate 28 and bottom plate 27 respectively, sealing the internal structure and transmitting axial force to the column, ensuring vertical load-bearing stability. Under seismic loading, when horizontal shear force is generated at the column base, the friction plate 30 and the irregular support 29 slide relative to each other along the second elongated holes 32, dissipating seismic energy through interface friction and reducing the risk of column failure. The C-shaped side plates 31 limit excessive displacement, preventing structural instability.

[0044] Overall working principle and key points of construction:

[0045] In normal use: the beam-column joint is connected by arc surface fitting, bolt fastening, and flange clamping to transmit force. The overall stiffness meets the requirements of vertical load and horizontal wind load, with small deformation and high safety.

[0046] During the seismic action phase: When the nodes rotate, the relative sliding friction of the arc surfaces of the column and beam web connection devices dissipates energy, while the elongated holes provide rotation space, improving the ductility of the nodes. The damping mechanism 6 first dissipates energy through elastic compression by the spring 18, and then through buckling plastic energy dissipation by the quadrilateral linkage mechanism during large deformation. This multi-stage energy dissipation reduces the damage of seismic forces to the main structure. The sliding friction between the column base friction plate 30 and the irregular support 29 dissipates energy, improving the shear resistance of the column base. The C-shaped side plates transmit axial forces, ensuring the vertical stability of the structure.

[0047] Construction key points: All steel components are coated with anti-corrosion and fire-retardant paint to suit the building's operating environment. Bolt tightening torque is controlled according to design values ​​to ensure connection strength without restricting energy dissipation displacement at the joints.

[0048] The above description is merely a preferred embodiment of this application and does not limit the scope of this application. All equivalent changes made based on the content of this application specification and drawings are included within the scope of this application.

Claims

1. An energy-dissipating prefabricated concrete frame structure, comprising precast columns and assembled beams connected to the precast columns, characterized in that, The precast column is equipped with a column web plate connecting device on its side, and the beam is equipped with a beam web plate connecting device at its end. Both the column web plate connecting device and the beam web plate connecting device include concave arc surfaces. After the two arc surfaces are joined together, a columnar cavity is formed. A damping mechanism is installed inside the columnar cavity. A first elongated hole is opened on both arc surfaces. A first fastening bolt is installed in the first elongated hole. The damping mechanism is fixedly connected to the first fastening bolt.

2. The energy-dissipating connected prefabricated concrete frame structure according to claim 1, characterized in that, The damping mechanism includes concentric inner column supports and outer ring supports. The outer ring supports are adapted to the cylindrical cavity, and damping units are arranged radially between the inner column supports and the outer ring supports. The damping unit includes a support rod fixed to an inner column support. A first connecting rod is hinged to both sides of the support rod on the inner column support. A second connecting rod is hinged to the end of the first connecting rod. The end of the second connecting rod is hinged to the support rod. The first and second connecting rods on both sides form a quadrilateral structure. A third connecting rod is hinged between the hinge points of the first and second connecting rods on both sides. Support lugs are hinged to both sides of the outer end of the support rod. A fixed seat plate is provided between the ends of the support lugs. The fixed seat plate abuts against the inner side of the outer ring support. A first fastening bolt passes through the outer ring support and is fixed to the fixed seat plate. A spring is sleeved on the support rod between the second connecting rod and the support lugs.

3. The energy-dissipating connected prefabricated concrete frame structure according to claim 1, characterized in that, Both the top and bottom surfaces of the column web connection device and the beam web connection device are connected by beam-column flange connection devices. The beam-column flange connection device includes a first lower fixing plate and a first upper clamping plate fixed on the column web plate connection device. A connecting plate is clamped and fixed between the first lower fixing plate and the first upper clamping plate. A second lower fixing plate and a second upper clamping plate are clamped and fixed on the upper and lower sides of the connecting plate and fixed to the beam web plate connection device.

4. The energy-dissipating connected prefabricated concrete frame structure according to claim 3, characterized in that, The first lower fixing plate, the first upper clamping plate, and the connecting plate are all T-shaped plates.

5. The energy-dissipating connected prefabricated concrete frame structure according to claim 3, characterized in that, The through hole in the connecting plate for connecting with the first lower fixing plate and the first upper clamping plate is an elongated hole.

6. The energy-dissipating connected prefabricated concrete frame structure according to claim 1, characterized in that, The column web connection device and the beam web connection device have the same structure, including a C-shaped support body. A stiffening plate is provided in the middle of the inner side of the C-shaped support body. The end of the stiffening plate is an arc shape that matches the arc surface. The arc surface is located at the end of the C-shaped support body and the stiffening plate.

7. The energy-dissipating connected prefabricated concrete frame structure according to claim 1, characterized in that, The bottom of the precast column is equipped with a column foundation connection device, which is used to fix the precast column to the foundation structure. The column foundation connection device includes a bottom plate and a top plate arranged opposite each other. An irregularly shaped support is provided on the bottom plate, with the top of the irregularly shaped support abutting against the bottom surface of the top plate. A friction plate is provided on the bottom surface of the top plate that fits against the side of the irregularly shaped support. A C-shaped side plate is supported between the bottom plate and the top plate at the edge.

8. The energy-dissipating connected prefabricated concrete frame structure according to claim 7, characterized in that, The lower part of the irregular support body is hollow. The irregular support body and the friction plate have a second elongated hole opposite each other. A second fastening bolt is installed in the second elongated hole to fasten the irregular support body and the friction plate.

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