A beam-column joint with a replaceable low-yield-point energy-dissipating truss

Abstract

The present invention discloses a beam-column node with a replaceable low-yield point energy-absorbing truss. Existing steel frame beam-column ductile nodes do not take into account the rapid repairability after damage. The present invention includes frame beams and frame columns and ear plates located at the joints of the frame beams and frame columns. The upper and lower flanges of the frame beams are respectively provided with energy-absorbing trusses. The energy-absorbing truss is a square hollow structure composed of two horizontal plates and two vertical plates. A plurality of fuse plates are obliquely arranged in the square hollow structure, and two adjacent fuse plates form a triangle with the horizontal plate. The fuse plate of the present invention has a hole in the middle and is weakened at the edge. When the node is damaged, the energy-absorbing truss first enters plastic energy absorption and then is destroyed, thereby achieving the purpose of protecting permanent components. The energy-absorbing truss is easy to disassemble and replace after the earthquake, realizing the possibility and convenience of post-earthquake repair.

Description

Technical Field

[0001] The invention belongs to the technical field of building steel structures, and in particular relates to a beam-column node with a replaceable low-yield point energy-consuming truss. Background Art

[0002] The design of beam-column joints plays a crucial role in the overall design of steel structures. The safety of beam-column joints directly impacts the reliability and integrity of steel structures. They effectively enhance the speed and quality of fabrication and installation, and are closely linked to construction schedules and costs. Traditional steel frame design relies on rigid beam-column joints. However, rigid connections lack ductility and are prone to brittle failure. Furthermore, because conventional frame structures dissipate seismic energy primarily through deformation of the main structure during earthquakes, even small earthquakes can cause irreversible residual deformation. Large earthquakes often lead to more severe damage, making repair difficult or necessitating demolition and reconstruction, resulting in significant economic losses. To enhance the overall seismic performance of steel frames, researchers worldwide have proposed measures to improve the ductility of beam-column joints in steel frames. These measures primarily focus on weakened or reinforced joints, end-plate connections, and spliced joints with cantilevered short beams. While these joints can improve the stress conditions at the beam end welds, they are relatively limited in functionality and fail to consider rapid repair after damage. Achieving rapid post-earthquake structural recovery has become a research trend in seismic engineering. Summary of the Invention

[0003] In order to make up for the shortcomings of the existing technology, the present invention provides a beam-column node with a replaceable low-yield point energy-dissipating truss. The node has high bearing capacity, overcomes the shortcomings of brittle failure of traditional rigid connections, improves the seismic performance of the beam-column node, and realizes the restoration of structural function by replacing the damaged energy-dissipating truss.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A beam-column node with a replaceable low-yield-point energy-dissipating truss comprises a vertically arranged frame beam and frame column, and a lug located at the joint of the frame beam and the frame column, the lug being welded to the frame column flange; the upper and lower flanges of the frame beam are respectively provided with energy-dissipating trusses;

[0006] The energy dissipation truss is a square hollow structure composed of two horizontal plates and two vertical plates. One horizontal plate is fixedly connected to the flange of the frame beam, and the end of the other horizontal plate is vertically connected to a flange plate, which is fixedly connected to the flange of the frame column.

[0007] A plurality of fuse boards are obliquely arranged in the square hollow structure formed by the horizontal plate and the vertical plate, and two adjacent fuse boards and the horizontal plate form a triangle.

[0008] Furthermore, the two energy-absorbing trusses on the upper and lower flanges of the frame beam are symmetrically arranged;

[0009] Furthermore, the fuse plate is provided with a strip-shaped hole;

[0010] Furthermore, the horizontal plates and vertical plates are fixedly connected to the frame beams and frame columns by high-strength bolts.

[0011] Beneficial effects of the present invention:

[0012] 1) The energy dissipation truss fuse plate of the present invention has a central opening and is weakened at the edges. When a node is damaged, the energy dissipation trusses symmetrically arranged above and below the node flanges first enter plastic energy dissipation and then fail. During the entire earthquake process, the remaining components remain elastic, reducing the damage to permanent components caused by earthquakes and achieving the purpose of protecting permanent components.

[0013] 2) The energy-dissipating truss of the present invention uses low-yield point steel, which has better ductility and avoids brittle failure of nodes:

[0014] 3) The energy-absorbing trusses of the present invention are connected to the columns and beams with high-strength bolts, resulting in a simple structure and reliable force transmission, bearing all shear forces, bending moments, and axial forces at the connection points. The energy-absorbing trusses are easy to disassemble and replace after an earthquake, realizing the possibility and convenience of post-earthquake repair.

[0015] 4) The energy dissipation trusses of the present invention are all manufactured in the factory, which can ensure the quality of the welds of the energy dissipation trusses. Only bolt connection is required at the construction site, and the construction is fast and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a front view of the present invention;

[0018] Figure 3 A top view of the present invention;

[0019] Figure 4 This is a schematic diagram of the energy dissipation truss structure of the present invention;

[0020] Figure 5 This is a schematic diagram of the fuse board structure of the present invention;

[0021] In the figure, 1-frame beam, 2-frame column, 3-ear plate, 4-horizontal plate, 5-fuse plate, 6-flange plate, 7-vertical plate, 8-high-strength bolt, 9-energy dissipation truss. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to specific embodiments.

[0023] like Figure 1 As shown, the present invention includes a vertically arranged frame beam 1 and a frame column 2, and the upper and lower flanges of the frame beam 1 are symmetrically provided with energy-absorbing trusses 9; the flanges of the frame column 2 are welded with ear plates 3, so that the frame column 2 and the frame beam 1 are fixedly connected.

[0024] The energy dissipation truss is composed of a horizontal plate 4, a fuse plate 5, a vertical plate 7, and a flange plate 6. It is made of low-yield point steel and is a square hollow structure formed by welding two horizontal plates 4 and two vertical plates 7. The two horizontal plates 4 are parallel to each other, and the two vertical plates 7 are parallel to each other. The horizontal plates 4 and the vertical plates 7 are perpendicular to each other.

[0025] like Figure 2 、 3 As shown, a horizontal plate 4 is fixedly connected to the flange of the frame beam 1 by high-strength bolts 8, and a flange plate 6 is vertically welded to the end of the other horizontal plate 4, and the flange plate 6 is fixedly connected to the flange of the frame column 2 by high-strength bolts 8;

[0026] like Figure 4 As shown, a plurality of fuse boards 5 are obliquely arranged in the square hollow structure formed by the horizontal plate 4 and the vertical plate 7, and two adjacent fuse boards 5 form a triangle with the horizontal plate 4; the fuse boards 5 are welded to the horizontal plate 4;

[0027] The fuse plate 5 partially acts as a stiffener within the square hollow structure formed by the horizontal plate 4 and the vertical plate 7, increasing the out-of-plane stiffness of the square hollow structure. This provides excellent local buckling and compressive bearing capacity, ensuring that even without stiffeners, the square hollow structure is less susceptible to out-of-plane instability. The triangle formed by the fuse plate 5 and the horizontal plate 4 prevents instability and allows for more complete yielding and plastic deformation, resulting in better energy dissipation.

[0028] like Figure 5 As shown, the fuse board 5 is provided with strip holes; the edges are weakened and semi-long strip holes are provided on both sides to ensure that when subjected to a large load, the fuse board 5 yields first, thereby achieving the purpose of protecting the main components;

[0029] In the present invention, energy-dissipating trusses are arranged at the upper and lower flanges of the beam at the node to strengthen the node and improve the node's bearing capacity, ductility and energy dissipation capacity; the energy-dissipating trusses are made of low-yield point steel with good ductility to avoid brittle failure of the node. The energy-dissipating trusses yield first in an earthquake and fully dissipate energy to reduce damage to the node body and protect the structural body; after the earthquake, the energy-dissipating trusses can be quickly replaced to achieve recoverable functions.

[0030] In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0031] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. A beam-column joint with a replaceable low-yield-point energy-dissipating truss, characterized by: It comprises a vertically arranged frame beam (1) and a frame column (2), and an ear plate (3) located at the joint between the frame beam (1) and the frame column (2), wherein the ear plate (3) is welded to the flange of the frame column (2); the upper and lower flanges of the frame beam (1) are respectively provided with energy-absorbing trusses (9); The energy dissipation truss (9) is a square hollow structure composed of two horizontal plates (4) and two vertical plates (7), one horizontal plate (4) is fixedly connected to the flange of the frame beam (1), and the end of the other horizontal plate (4) is vertically connected to a flange plate (6), and the flange plate (6) is fixedly connected to the flange of the frame column (2); A plurality of fuse boards (5) are obliquely arranged in the square hollow structure formed by the horizontal plate (4) and the vertical plate (7), and two adjacent fuse boards (5) and the horizontal plate (4) form a triangle.

2. A beam-column joint with a replaceable low-yield-point energy-dissipating truss according to claim 1, characterized in that: The two energy-absorbing trusses (9) on the upper and lower flanges of the frame beam (1) are symmetrically arranged.

3. The beam-column joint with a replaceable low-yield-point energy-dissipating truss according to claim 2, characterized in that: The fuse plate (5) is provided with a strip-shaped hole.

4. The beam-column joint with a replaceable low-yield-point energy-dissipating truss according to claim 3, characterized in that: The horizontal plate (4) and the vertical plate (7) are both fixedly connected to the frame beam (1) and the frame column (2) via high-strength bolts (8).

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