A haunch-type beam-column joint, beam-column frame and building structure

Abstract

This utility model discloses a haunched beam-column joint, a beam-column frame, and a building structure. The haunched beam-column joint includes a steel column, a steel beam, and a haunch. The steel beam is an I-beam with two first flanges and a first web plate disposed between the two first flanges. One end of the steel beam is connected to the steel column. The end of the lower first flange plate connected to the steel column is bent downwards and extends to connect with the steel column. The end of the first web plate connected to the steel column extends downwards to connect with the lower first flange plate. The haunch includes two second flanges, each corresponding to one of the two first flanges. Each second flange is located on the opposite side of its corresponding long side and is flush with the corresponding first flange. Each second flange is connected to both the steel column and the corresponding first flange. By horizontally adding a haunch at the beam-column joint, the overall beam-column joint achieves better aesthetics while providing good support strength and shear resistance.

Description

Technical Field

[0001] This utility model belongs to the field of building technology, and in particular relates to a haunched beam-column joint, a beam-column frame and a building body. Background Technology

[0002] Steel columns possess advantages such as high load-bearing capacity, excellent plasticity and toughness, and convenient construction, meeting the needs of modern building construction and industrialization. To meet functional requirements and accelerate construction progress, super high-rise hotel and office buildings often employ a combined structure of long rectangular steel-concrete composite columns, steel beams, and a reinforced concrete core tube. The steel beams are aligned with the edges of the long rectangular steel-concrete composite columns, forming a large eccentric beam-column joint. Under horizontal seismic and wind loads, the eccentric beam-column joint bears not only bending moment, shear force, and axial force, but also additional torque and bending moment from the frame beams. The stress state in the joint core area is extremely complex. The beam-column eccentricity induces additional torque and bending moment, leading to a reduction in the effective width of the joint core area and a decrease in shear bearing capacity. This failure phenomenon has been observed in numerous major earthquakes both domestically and internationally. To overcome this problem, the current approach is to add haunches above and below the beam-column joint to improve the strength of the beam-column connection (as disclosed in document CN222575787U, "A Reinforced Joint for Steel-Concrete Composite Flat Column Beam"). However, adding haunches upwards can affect the building's functionality and ultimately the aesthetics of the beam-column joint, while not significantly improving the horizontal shear resistance of the steel beam. Utility Model Content

[0003] To solve the above-mentioned technical problems, one of the objectives of this utility model is to provide a haunched beam-column joint with a simple structure, high connection strength, and good shear resistance.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A haunched beam-column joint includes a steel column, a steel beam, and a haunch member. The steel column is a vertically arranged long rectangular steel pipe column, which is filled with concrete. The steel column has two oppositely distributed long side faces and two oppositely distributed wide side faces. The steel beam is a horizontally arranged I-beam, which has two horizontally distributed and vertically spaced first flange plates and a first web plate vertically arranged in the middle between the two first flange plates. One end of the steel beam is connected to one side of the long side face and is located below. The first flange plate of the square is bent downward at one end and extends to connect with the steel column, and the first web plate is extended downward at one end to connect with the first flange plate located below; the armhole includes two second flange plates distributed vertically at intervals, the two second flange plates corresponding one-to-one with the two first flange plates, each second flange plate is located on the other side of the corresponding long side surface and is flush with the corresponding first flange plate, and each second flange plate is connected to the steel column and the corresponding first flange plate respectively.

[0005] The beneficial effects of the above technical solution are as follows: by adding a second flange plate corresponding to the two first flange plates on the inner side of the corner at the beam-column connection for reinforcement, the connection strength and shear resistance of each first flange plate to the steel column are enhanced. In addition, the haunch is set on the inner side of the corner at the beam-column connection. The haunch will be buried under the floor slab later, so the addition of the haunch will not protrude above the floor and will not affect the building's functionality. Furthermore, extending and thickening the steel beam downward at the beam-column connection is equivalent to forming a haunch structure at the lower end of the beam-column connection, which can further improve the vertical load-bearing capacity and shear resistance of the beam-column connection.

[0006] In the above technical solution, the angle between the end of the first flange plate located below and the steel column connected to the horizontal plane is 30-60°; the length of the downward bending part of the first flange plate located below on the horizontal plane is 400-1000mm.

[0007] The beneficial effects of the above technical solution are: it makes the first flange plate located below look better at the bend and can further improve the support characteristics of the beam-column connection.

[0008] In the above technical solution, each second flange plate is integrally formed with the corresponding first flange plate.

[0009] The beneficial effects of the above technical solution are that it can improve the connection strength between the haunch and the steel beam, and improve the overall strength of the beam-column connection.

[0010] In the above technical solution, two horizontally arranged partitions are provided inside the steel column at the position corresponding to the steel beam. A vertical partition plate is provided between the two partitions. The partitions have multiple vertically penetrating grouting holes, and each partition has at least one grouting hole on each side corresponding to the partition plate.

[0011] The beneficial effects of the above technical solution are as follows: after the partition and the dividing plate are connected, they form an embedded part that is connected to the steel column and embedded in the concrete filling. This can strengthen the bond strength between the steel column and the concrete filling at the beam-column connection and balance the tension and pressure transmitted from the first flange plate and the second flange plate.

[0012] The armhole fitting described in the above technical solution also includes a second intermediate web plate vertically disposed between the two second flange plates, and the upper and lower ends of the second intermediate web plate are respectively connected to the two second flange plates.

[0013] The beneficial effects of the above technical solution are as follows: by adding a second web plate, the end of the steel beam has two I-shaped structures, which can improve the torsional resistance of the haunch and effectively diffuse the bending stress at the end of the steel beam, and solve the problem of stress concentration on the steel column wall at the beam-column connection.

[0014] In the above technical solution, the second middle web plate is inclined relative to the first middle web plate, and one end of the second middle web plate extends to connect with the steel column, and the other end extends to the corresponding side of the steel beam, and is connected to the first middle web plate and the two first flange plates respectively.

[0015] The beneficial effect of the above technical solution is that it can further improve the connection strength and shear resistance of the beam-column joint.

[0016] In the above technical solution, a reinforcing plate perpendicular to the first web plate is provided on the steel beam at the connection point corresponding to the first web plate and the second web plate.

[0017] The beneficial effect of the above technical solution is that it can improve the strength of the connection between the first and second web plates.

[0018] The second objective of this utility model is to provide a beam-column frame that is simple in structure, has high structural strength, good aesthetics, and excellent shear resistance.

[0019] To achieve the above objectives, the technical solution of this utility model is as follows: a beam-column frame, including the haunched beam-column joint as described above.

[0020] The beneficial effects of the above technical solution are: the beam-column connection of the beam-column frame has high structural strength, good aesthetics, and excellent shear resistance.

[0021] The second objective of this utility model is to provide a beam-column frame that is simple in structure, has high structural strength, good aesthetics, and excellent shear resistance.

[0022] To achieve the above objectives, the technical solution of this utility model is as follows: a building body, including the beam-column frame as described above.

[0023] The beneficial effects of the above technical solution are that the building has good structural strength at the beam-column joints and good seismic resistance. Attached Figure Description

[0024] Figure 1 This is a top view of the haunched beam-column joint described in Embodiment 1 of this utility model; Figure 2 This is a cross-sectional view of the steel beam described in Embodiment 1 of this utility model; Figure 3 for Figure 1 Cross-sectional view at point AA; Figure 4 This is a front view of the beam-column connection on the side away from the haunch member in Embodiment 1 of this utility model; Figure 5 This is a front view of the beam-column connection near the haunch in Embodiment 1 of this utility model; Figure 6 This is an elevation view of the beam-column connection on the side away from the armhole in Embodiment 1 of this utility model; Figure 7 This is an elevation view of the beam-column connection near the haunch in Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of two steel beams symmetrically arranged on both sides of the steel column in Embodiment 1 of this utility model.

[0025] In the figure: 1. Steel column; 11. Long side face; 12. Wide side face; 13. Partition plate; 131. Grouting hole; 14. Partition plate; 2. Steel beam; 21. First flange plate; 22. First middle web plate; 23. Reinforcing plate; 3. Armhole fitting; 31. Second flange plate; 32. Second middle web plate. Detailed Implementation

[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0029] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0030] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0031] Example 1 like Figure 1 , Figure 2 , Figures 4-7 As shown, this embodiment provides a haunched beam-column joint, including a steel column 1, a steel beam 2, and a haunch member 3. The steel column 1 is a vertically arranged long rectangular steel pipe column, which is filled with concrete. The steel column 1 has two oppositely distributed long side surfaces 11 and two oppositely distributed wide side surfaces 12. The steel beam 2 is a horizontally arranged I-beam, which has two horizontally distributed and vertically spaced first flange plates 21 and a first web plate 22 vertically arranged in the middle between the two first flange plates 21. One end of the steel beam 2 is connected to one side of the long side surface 11. The haunch member 3 includes two vertically spaced second flange plates 31, which correspond one-to-one with the two first flange plates 21. Each second flange plate 31 is located on the other side of the corresponding long side surface 11 and is flush with the corresponding first flange plate 21. Each second flange plate 31 is connected to the steel column 1 and the corresponding first flange plate 21 respectively. By adding a second flange plate 31 corresponding to each of the two first flange plates 21 on the inner side of the corner at the beam-column connection, the connection strength and shear resistance of each first flange plate 21 to the steel column 1 are enhanced. In addition, the haunch 3 is set on the inner side of the corner at the beam-column connection. The haunch 3 will be buried under the floor slab in the later stage, so the addition of the haunch 3 will not protrude above the floor and will not affect the building's functionality.

[0032] in, Figure 1 The dashed lines on the central armhole and steel beam represent the second and first central web plates in perspective view.

[0033] In this embodiment, each connection can be either integrally formed or welded (unless specifically stated that it is an integrally formed connection, it can be understood as welded).

[0034] In this embodiment, "beam-column connection" is the abbreviation for the connection between steel column 1 and steel beam 2.

[0035] In this embodiment, "long rectangular steel pipe column" refers to a pipe column with a rectangular cross-section (long side and wide side) (and hollow inside).

[0036] In this embodiment, "long side surface 11" refers to the side surface corresponding to the length and height of the steel column 1, and "wide side surface 12" refers to the side surface corresponding to the width and height of the steel column 1.

[0037] Since the first flange plate 21 is perpendicularly connected to the steel column 1 in this embodiment, the corner at the connection between the first flange plate 21 and the steel column 1 is a right angle.

[0038] Preferred, such as Figure 1 As shown, the second flange plate 31 is a right triangle, with one right-angled side attached to and connected to the steel column 1, and the other right-angled side attached to and connected to the corresponding side of the first flange plate 21.

[0039] In a further preferred embodiment, each of the second flange plates 31 is coplanar with the corresponding first flange plate 21.

[0040] In a more preferred embodiment, each of the second flange plates 31 is integrally formed with the corresponding first flange plate 21.

[0041] like Figure 1 As shown, in this embodiment, one end of the steel beam 2 is connected to one side of the long side surface 11, that is, the steel beam 2 and the long side surface 11 are eccentrically connected (that is, the connection point is not located in the middle of the corresponding position of the long side surface 11, but at the side edge of the long side surface 11). Therefore, an L-shaped corner will be formed at the horizontal position of the beam-column connection, and the armhole 3 is set inside the corner.

[0042] like Figures 4-7 As shown, to further improve the structural strength and shear resistance of the beam-column connection, in this embodiment, the end of the first flange plate 21 located below, which connects to the steel column 1, is bent downwards and extends to connect with the steel column 1. Furthermore, the end of the first web plate 22 located below, which connects to the steel column 1, extends downwards to connect with the first flange plate 21 located below (this can be achieved by welding or integral molding, with integral molding being preferred). This causes the steel beam 2 to extend and thicken downwards at the beam-column connection, effectively forming a haunch structure at the lower end of the beam-column connection. This further improves the vertical load-bearing capacity and shear resistance of the beam-column connection. like Figures 4-7 As shown, the upper first flange plate 21 remains horizontal, so the upper second flange plate 31 is also horizontal. The lower end of the first flange plate 21 connected to the steel column 1 is bent downwards, so the lower second flange plate 31 is also tilted and remains flush with the lower first flange plate 21 (its tilt angle with the horizontal plane is also α). The lower end of the lower second flange plate 31 away from the steel column 1 can be aligned with the bend transition of the lower first flange plate 21.

[0043] Preferred, such as Figure 4 As shown, the angle α between the end of the lower first flange plate 21 connected to the steel column 1 and the horizontal plane is 30-60° (specifically, it can be any value among 30°, 45°, and 60°, or any range between any two values); the length L of the downward bend of the lower first flange plate 21 projected onto the horizontal plane is 400-1000mm (specifically, it can be any value among 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, and 1000mm, or any range between any two values). This makes the lower first flange plate 21 aesthetically pleasing at the bend and further improves the support characteristics of the beam-column connection.

[0044] like Figure 1 and Figure 3 As shown in the above technical solution, two horizontally arranged partitions 13 are provided inside the steel column 1 at the position corresponding to the steel beam 2. A vertical partition plate 14 is provided between the two partitions 13. Each partition 13 has multiple vertically penetrating grouting holes 131, and each partition 13 has at least one grouting hole 131 on each side corresponding to the partition plate 14. This allows the partitions 13 and 14 to form an embedded part that is connected to the steel column 1 and embedded in the concrete filler. This strengthens the bond strength between the steel column 1 and the concrete filler at the beam-column connection and balances the tensile and compressive forces transmitted from the first flange plate 21 and the second flange plate 31.

[0045] In this embodiment, the partition plate 13 and the partition plate 14 can be integrally formed with the steel column 1.

[0046] Specifically, the partition plate 14 is parallel to the wide side surface 12, and each partition plate 13 has at least two grouting holes 131, through which concrete grout can flow downward to fill the entire steel column 1. In this embodiment, the diameter of the grouting hole 131 can be set to at least 200mm (the specific diameter can be set as needed to ensure smooth flow of concrete grout).

[0047] like Figure 1 and Figure 5 As shown, the armhole 3 in the above technical solution also includes a second intermediate web plate 32 vertically disposed between the two second flange plates 31, and the upper and lower ends of the second intermediate web plate 32 are respectively connected to the two second flange plates 31. By adding the second intermediate web plate 32, the end of the steel beam 2 has two I-shaped structures, which can improve the torsional resistance of the armhole 3, effectively diffuse the bending stress at the end of the steel beam 2, and solve the stress concentration problem of the column wall of the steel column 1 at the beam-column connection.

[0048] Preferably, the second middle web plate 32 can also be integrally formed with the two second flange plates 31.

[0049] like Figure 1 As shown, in the above technical solution, the second web plate 32 is inclined relative to the first web plate 22, and one end of the second web plate 32 extends to connect with the steel column 1, while the other end extends to the corresponding side of the steel beam 2, and connects with the first web plate 22 and the two first flange plates 21 respectively. This can further improve the connection strength and shear resistance at the beam-column connection.

[0050] Preferably, the second web plate 32 can also be integrally formed with the steel beam 2.

[0051] In the above technical solution, a reinforcing plate 23 perpendicular to the first intermediate web plate 22 is provided on the steel beam 2 at the connection point corresponding to the first intermediate web plate 22 and the second intermediate web plate 32. This can improve the strength of the connection point between the first intermediate web plate 22 and the second intermediate web plate 32.

[0052] Preferably, the reinforcing plate 23 can also be integrally formed with the steel beam 2.

[0053] Preferred, such as Figure 8 As shown, in this embodiment, two steel beams 2 can be provided, and two armholes 3 can also be provided. The two steel beams 2 and the two armholes 3 can correspond one-to-one, and the two steel beams 2 and the two armholes 3 are symmetrically arranged on both sides of the steel column 1.

[0054] Preferably, in this embodiment, the lengths of the two straight sides of the upper second flange plate can be set to 1.5-2.5:1, that is, the length of the side connected to the steel beam is 1.5-2 times the length of the side connected to the steel column, preferably 2 times. Preferably, in this embodiment, the projection of the lower second flange plate 31 on the horizontal plane coincides with the upper second flange plate 31, which can further improve the aesthetics of the haunched beam-column joint.

[0055] Compared to the structure disclosed in document CN222575787U, "A Steel-Concrete Composite Flat Column External Beam Reinforcement Node", the haunched beam-column joint provided in this embodiment has the advantages of being more compact and aesthetically pleasing after construction. Furthermore, the beam-column joint in this embodiment can be reinforced with haunches in both horizontal and vertical directions, while the existing literature, although having two haunched structures, still reinforces with haunches in only one direction.

[0056] in, Figures 6-8 The dashed line in the figure represents the boundary line between the first flange and the corresponding second flange.

[0057] Example 2 This embodiment provides a beam-column frame, including the haunched beam-column joint as described in Embodiment 1. This beam-column frame exhibits high structural strength and aesthetic appeal at the beam-column connection, while also providing excellent shear resistance.

[0058] Example 3 This embodiment provides a building structure, including the beam-column frame as described in Embodiment 2. This building structure exhibits good structural strength at the beam-column joints and good seismic resistance.

[0059] Specific examples: A certain super high-rise building adopts a combined structure of steel columns + steel beams + reinforced concrete core tube, with the steel beams and steel columns aligned at their edges to form a large eccentric beam-column joint. The steel column has a cross-section of 1400mm (length) × 700mm (width) × 25mm (wall thickness), and the steel beam has a cross-section of 800mm (height) × 300mm (width) × 16mm (thickness of the first flange plate) × 30mm (thickness of the first web plate). A haunch is added to the end of the steel beam. The thickness of the second web plate is 16mm, and the thickness of the second flange plate is 30mm. The lengths of the two straight sides of the upper second flange plate are 300mm and 600mm respectively (the projection of the lower second flange plate on the horizontal plane should coincide with that of the upper second flange plate). The downward bending angle α of the lower second flange plate is 30°, and the length L of the bending point is 600mm. The thickness of the partition plate is 30mm, and the diameter of the grouting hole is 250mm. The thickness of the partition plate is 20mm. The provided haunch-type beam-column joint meets the design requirements.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A haunched beam-column joint, comprising a steel column (1), a steel beam (2), and a haunched member (3), wherein the steel column (1) is a vertically arranged long rectangular steel pipe column, the steel column (1) is filled with concrete, the steel column (1) has two oppositely distributed long side surfaces (11) and two oppositely distributed wide side surfaces (12), the steel beam (2) is a horizontally arranged I-beam, having two horizontally distributed and vertically spaced first flange plates (21) and a first web plate (22) vertically arranged in the middle between the two first flange plates (21), one end of the steel beam (2) is connected to one side of the long side surface (11), characterized in that, The end of the first flange plate (21) located below is bent downward and extended to connect with the steel column (1), and the end of the first middle web plate (22) connected with the steel column (1) extends downward to connect with the first flange plate (21) located below; the armhole member (3) includes two second flange plates (31) distributed vertically and horizontally, the two second flange plates (31) correspond one-to-one with the two first flange plates (21), each second flange plate (31) is located on the other side of the corresponding long side surface (11) and is flush with the corresponding first flange plate (21), each second flange plate (31) is connected to the steel column (1) and the corresponding first flange plate (21) respectively.

2. The haunched beam column joint according to claim 1, wherein, The angle between the end of the first flange plate (21) located below and the steel column (1) and the horizontal plane is 30-60°; the length of the projection of the downward bend of the first flange plate (21) located below on the horizontal plane is 400-1000mm.

3. The haunched beam-column joint according to claim 1, characterized in that, Each of the second flanges (31) is integrally formed with the corresponding first flange (21).

4. The haunched beam-column joint according to claim 1, characterized in that, Inside the steel column (1), at the position corresponding to the steel beam (2), two horizontally arranged partitions (13) are provided, and a vertical partition plate (14) is provided between the two partitions (13). The partitions (13) have multiple vertically penetrating grouting holes (131), and each partition (13) has at least one grouting hole (131) on each side corresponding to the partition plate (14).

5. The haunched beam-column joint according to any one of claims 1-4, characterized in that, The armhole (3) also includes a second middle web plate (32) vertically disposed between the two second flange plates (31), and the upper and lower ends of the second middle web plate (32) are respectively connected to the two second flange plates (31).

6. The haunched beam-column joint according to claim 5, characterized in that, The second middle web plate (32) is inclined relative to the first middle web plate (22), and one end of the second middle web plate (32) extends to connect with the steel column (1), and the other end extends to the corresponding side of the steel beam (2), and is connected to the first middle web plate (22) and the two first flange plates (21) respectively.

7. The haunched beam-column joint according to claim 6, characterized in that, A reinforcing plate (23) perpendicular to the first web plate (22) is provided on the steel beam (2) at the connection between the first web plate (22) and the second web plate (32).

8. A beam-column frame, characterized in that, Includes the haunched beam-column joint as described in any one of claims 1-7.

9. A building structure, characterized in that, Includes the beam-column frame as described in claim 8.

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