Connecting joint structure of rectangular concrete filled steel tubular column and reinforced concrete beam
The second-order upper flange steel bracket connection node structure solves the construction difficulty and seismic performance problems of the connection node between rectangular steel tube concrete columns and reinforced concrete beams, achieving direct force transmission, simplified construction and guaranteed welding quality.
Patent Information
- Application Number
- CN202521647152.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-05
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2035-08-05
AI Technical Summary
The connection nodes between existing rectangular steel tube concrete columns and reinforced concrete beams have problems such as complex node structure, difficult to evaluate force transmission efficiency, difficult construction, and insufficient seismic performance.
A second-order upper flange steel corbel connection node structure is adopted, including welding the second-order upper flange steel corbel to the rectangular steel tube concrete column, strengthening the connection with the reinforced concrete frame beam through shear studs, and installing beam stirrups on the outside of the steel corbel to optimize the connection and anchorage form of the steel bars at the bottom of the beam.
It simplifies the construction difficulty, ensures direct force transmission, improves seismic performance, and ensures welding quality and construction quality.
Smart Images
Figure CN223330009U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of building structures, and in particular relates to a connection node structure of a rectangular steel tube concrete column and a reinforced concrete beam. Background Art
[0002] Rectangular concrete-filled steel tubular columns combine the high strength of steel tubes with the compressive properties of concrete, making them widely used in high-rise buildings and long-span structures. However, their connection to reinforced concrete beams has long been a design challenge, due to complex joint construction, difficulty assessing force transmission efficiency, and significant construction difficulties. According to the "Code for Design of Composite Structures" (JGJ138-2016) and the "Technical Code for Concrete-Filled Steel Tubular Structures" (GB 50936-2014), common connection nodes currently include: ring beam steel bearing pin connections, through-reinforcement connections, and steel corbel connections.
[0003] Ring beam steel load-bearing pin connection: The node adopts an octagonal reinforced concrete ring beam set outside the column, and the longitudinal reinforcement of the reinforced concrete beam is anchored into the ring beam to transfer the bending moment; the shear force is transmitted to the core area of the column through a semi-through steel corbel (load-bearing pin) welded to the steel tube wall; its advantage is that the main reinforcement of the concrete beam can be anchored into it by setting the ring beam, thereby avoiding the problem of welding connection with the steel column; its disadvantage is that the scale of the column head ring beam is increased, which has a great impact on the use function of the building; the through-type load-bearing pin needs to penetrate the steel tube, which is difficult to construct; the non-through-type is prone to stress concentration or even tearing of the steel tube wall; although the semi-through-type is a compromise, there is still a risk of local weld fatigue.
[0004] Through-reinforcement connection node: The node adopts a rigid connection method by directly passing the longitudinal reinforcement of the reinforced concrete beam through the wall of the rectangular steel pipe column. Its advantages are direct force transmission path and simple theoretical calculation. Its disadvantages are weakened steel pipe wall and significant reduction of local bearing capacity of the steel pipe by opening, requiring additional reinforcement measures (such as thickening the pipe wall), which increases material cost. Construction is difficult, positioning of steel bars through the pipe is difficult, and concrete pouring is prone to blockage of holes, affecting density. The node has poor ductility, brittle cracking is prone to occur around the hole under high shear force, and seismic performance is insufficient.
[0005] Steel corbel connection node: The node uses a steel column node position to set a steel corbel, which is used to transfer the bending moment and shear force of the reinforced concrete beam. The advantage is that the use of steel corbels can solve the bending moment and shear force transmission problem between the steel pipe column and the concrete beam at one time, and the node size does not need to be increased, and there is no impact on the construction profession. The disadvantage is that the welding construction between the reinforced concrete beam and the steel tube concrete column corbel is difficult, especially for multiple rows of steel bars, overhead welding and other problems will occur, and the construction quality is difficult to guarantee. Utility Model Content
[0006] The utility model is proposed to overcome the shortcomings of the prior art and aims to provide a connection node structure between a rectangular steel tube concrete column and a reinforced concrete beam.
[0007] The utility model is realized through the following technical solutions:
[0008] A connection node structure of a rectangular steel tube concrete column and a reinforced concrete beam, comprising a rectangular steel tube concrete column and at least a pair of reinforced concrete frame beams connected to the rectangular steel tube concrete column, wherein the connection node of the rectangular steel tube concrete column and the reinforced concrete beam adopts a second-order upper flange steel corbel; the cross-section of the second-order upper flange steel corbel is an I-shaped structure, and its top surface is a second-order stepped surface; a plurality of outer-row beam upper bars and a plurality of second-row beam upper bars are welded above the top surface of the second-order upper flange steel corbel; a plurality of outer-row beam lower bars are welded above the bottom surface of the second-order upper flange steel corbel, and at the same time, a plurality of second-row beam lower bars extend to the side wall of the steel column for bending and anchoring; beam stirrups are sleeved on the outside of the second-order upper flange steel corbel; beam waist bars and tension bars are arranged on both sides of the second-order upper flange steel corbel; bolts are arranged on both sides of the second-order upper flange steel corbel to strengthen the shear connection between the corbel and the concrete.
[0009] In the above technical solution, one end of the second-order upper flange steel corbel is welded and fixed to the rectangular steel tube concrete column.
[0010] In the above technical solution, the second-order upper flange steel corbel is connected to the reinforced concrete frame beam in a shear-resistant manner through a plurality of shear studs.
[0011] In the above technical solution, the side of the second-order upper flange steel corbel close to the rectangular steel tube concrete column is a first-order high top surface, and the side away from the rectangular steel tube concrete column is a second-order low top surface. The first-order high top surface and the second-order low top surface are smoothly connected by an inclined surface.
[0012] In the above technical solution, the ends of the upper reinforcements of the outer row of beams are welded and fixed to the first-order high top surface of the second-order upper flange steel corbel; the ends of the upper reinforcements of the second row of beams are welded and fixed to the second-order low top surface of the second-order upper flange steel corbel.
[0013] In the above technical solution, the horizontal plane where the lower reinforcement of the outer row of beams is located is below the horizontal plane where the lower reinforcement of the second row of beams is located, the end of the lower reinforcement of the outer row of beams is welded and fixed to the inner bottom surface of the second-order upper flange steel corbel, and the connection point between the lower reinforcement of the outer row of beams and the second-order upper flange steel corbel is located below the second-order low top surface; the lower reinforcement of the second row of beams extends to the side wall of the rectangular steel tube concrete column and is bent at a right angle and anchored.
[0014] In the above technical solution, the outer row of beam upper reinforcement and the second row of beam upper reinforcement are both placed on the inner side of the beam stirrups.
[0015] In the above technical solution, the rectangular steel tube concrete column is composed of a steel tube and concrete filled in the steel tube; a plurality of inner partitions are arranged in the rectangular steel tube concrete column.
[0016] In the above technical solution, when the cross-sectional heights of the reinforced concrete frame beams on both sides of the rectangular steel tube concrete column are the same, two inner partitions are provided in the rectangular steel tube concrete column, one inner partition is flush with the upper end surface of the connection end of the second-order upper flange steel corbel and the rectangular steel tube concrete column, and the other inner partition is flush with the lower end surface of the connection end of the second-order upper flange steel corbel and the rectangular steel tube concrete column;
[0017] When the cross-sectional difference between the reinforced concrete frame beams on both sides of the rectangular steel tube concrete column is no more than 200 mm, two inner partitions are provided in the rectangular steel tube concrete column, and the upper and lower end surfaces of the two inner partitions are flush with the upper flange steel brackets in the reinforced concrete frame beam with a larger beam cross-section;
[0018] When the height difference of the cross-section of the reinforced concrete frame beams on both sides of the rectangular steel tube concrete column is greater than 200 mm, four internal partitions are arranged in the rectangular steel tube concrete column, and the four internal partitions are flush with the upper and lower end surfaces of the second-order upper flange steel brackets in the reinforced concrete frame beams on both sides.
[0019] In the above technical solution, the inner partition is a rectangular plate structure, and its shape and size match the shape and size of the steel tube inner cavity of the rectangular steel tube concrete column; the four sides of the inner partition are welded and fixed to the steel tube inner cavity of the rectangular steel tube concrete column; a grouting hole is formed in the middle of the inner partition, and exhaust holes are set at its four corners.
[0020] The beneficial effects of the utility model are:
[0021] The utility model provides a connection node structure between a rectangular steel tube concrete column and a reinforced concrete beam. Based on the traditional steel bracket connection node, a two-order steel bracket connection node form is creatively proposed to solve the problem of overhead welding of the two rows of steel bars in the upper part of the reinforced concrete beam, thereby effectively ensuring the welding quality. At the same time, the connection and anchoring form of the two rows of steel bars in the lower part of the beam is also optimized. The utility model effectively solves the construction problem of the steel bracket connection node of the steel tube concrete column, ensuring that this connection node can achieve direct force transmission and excellent seismic performance in actual construction, while also simplifying the construction difficulty and ensuring construction quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is the main view of the utility model;
[0023] Figure 2 yes Figure 1 Middle AA section;
[0024] Figure 3 yes Figure 1Middle BB section;
[0025] Figure 4 yes Figure 1 Mid-CC section;
[0026] Figure 5 This is a schematic diagram of the connection node structure when the height difference of the reinforced concrete frame beams on both sides of the rectangular steel tube concrete column of the utility model is different and the height difference is no more than 200mm;
[0027] Figure 6 This is a schematic diagram of the connection node structure when the height difference of the reinforced concrete frame beams on both sides of the rectangular steel tube concrete column of the utility model is different and the height difference is greater than 200mm.
[0028] in:
[0029] 1. Rectangular concrete-filled steel tube column; 2. Reinforced concrete frame beam; 3. Second-order upper flange steel corbel; 4. Shear studs; 5. Internal partition; 6. Upper reinforcement of outer row beams; 7. Upper reinforcement of second row beams; 8. Lower reinforcement of outer row beams; 9. Lower reinforcement of second row beams; 10. Grouting hole; 11. Vent hole; 12. Floor slab reinforcement connecting plate; 13. Beam stirrups; 14. Beam waist reinforcement; 15. Tie bars.
[0030] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION
[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.
[0032] like Figures 1 to 4 As shown, a connection node structure of a rectangular steel tube concrete column and a reinforced concrete beam includes a rectangular steel tube concrete column 1 and at least a pair of reinforced concrete frame beams 2 connected to the rectangular steel tube concrete column 1. The reinforced concrete frame beam 2 is connected to the rectangular steel tube concrete column 1 using a second-order upper flange steel bracket 3; one end of the second-order upper flange steel bracket 3 is welded and fixed to the rectangular steel tube concrete column 1; the second-order upper flange steel bracket 3 is connected to the reinforced concrete frame beam 2 to strengthen the shear resistance by using multiple shear studs 4;
[0033] The second-order upper flange steel corbel 3 is an I-shaped structure consisting of a top surface, a vertical beam and a bottom surface. The bottom surface is a plane and the top surface is a second-order stepped surface. The side of the second-order upper flange steel corbel 3 close to the rectangular steel tube concrete column 1 is a first-order high top surface, and the side away from the rectangular steel tube concrete column 1 is a second-order low top surface. The first-order high top surface and the second-order low top surface are smoothly connected by an inclined surface.
[0034] A plurality of outer-row beam upper reinforcements 6 and a plurality of second-row beam upper reinforcements 7 are welded above the top surface of the second-order upper flange steel corbel 3; the ends of the outer-row beam upper reinforcements 6 are welded and fixed to the first-order high top surface of the second-order upper flange steel corbel 3; the horizontal plane where the second-row beam upper reinforcements 7 are located is located below the horizontal plane where the outer-row beam upper reinforcements 6 are located; the ends of the second-row beam upper reinforcements 7 are welded and fixed to the second-order low top surface of the second-order upper flange steel corbel 3;
[0035] A plurality of outer-row beam lower reinforcements 8 are welded above the bottom surface of the second-order upper flange steel corbel 3; a plurality of second-row beam lower reinforcements 9 are arranged above the bottom surface of the second-order upper flange steel corbel 3;
[0036] The horizontal plane where the outer row beam lower reinforcement 8 is located is located below the horizontal plane where the second row beam lower reinforcement 9 is located, and the end of the outer row beam lower reinforcement 8 is welded and fixed to the inner bottom surface of the second-order upper flange steel corbel 3, and the connection point between the outer row beam lower reinforcement 8 and the second-order upper flange steel corbel 3 is located below the second-order low top surface;
[0037] As mentioned above, the second row of beam lower reinforcement 9 extends to the side wall of the rectangular steel tube concrete column 1 and is bent and anchored;
[0038] The second-order upper flange steel corbel 3 is sheathed with beam stirrups 13, and the outer row of beam upper reinforcements 6 and the second row of beam upper reinforcements 7 are both placed inside the beam stirrups 13;
[0039] A plurality of beam waist reinforcements 14 are provided on both sides of the vertical beam of the second-order upper flange steel corbel 3, and two beam waist reinforcements 14 on the same horizontal plane on both sides of the vertical beam of the second-order upper flange steel corbel 3 are connected by tie bars 15;
[0040] At the location of the second-order upper flange steel bracket 3, only the outer circle of the reinforced concrete frame beam 2 is retained. Since the shear resistance of the steel bracket is much greater than that of the original stirrups, only the outer circle is retained and the internal stirrups are removed. At the locations other than the second-order upper flange steel bracket 3, stirrups of reinforced concrete beams are set as usual ( Figure 1 The three black vertical lines on the right are the conventional stirrups of reinforced concrete beams);
[0041] The rectangular steel tube concrete column 1 is composed of a steel tube and concrete filled in the steel tube; a plurality of inner partitions 5 are arranged in the rectangular steel tube concrete column 1;
[0042] like Figure 1 As shown, when the top elevations of the reinforced concrete frame beams 2 on both sides of the rectangular steel tube concrete column 1 are the same, two inner partitions 5 are set in the rectangular steel tube concrete column 1, one inner partition 5 is flush with the upper end surface of the connection end of the second-order upper flange steel corbel 3 and the rectangular steel tube concrete column 1, and the other inner partition 5 is flush with the lower end surface of the connection end of the second-order upper flange steel corbel 3 and the rectangular steel tube concrete column 1;
[0043] like Figure 5As shown, when the height difference of the reinforced concrete frame beams 2 on both sides of the rectangular steel tube concrete column 1 is not greater than 200 mm, two inner partitions 5 are set in the rectangular steel tube concrete column 1. The two inner partitions 5 are flush with the upper and lower end surfaces of the second-order upper flange steel corbels 3 in the reinforced concrete frame beam 2 with a larger beam section;
[0044] When the height difference of the reinforced concrete frame beam 2 on both sides of the rectangular steel tube concrete column 1 is not greater than 200mm ( Figure 5 ), the smaller beam section is sloped and increased at the beam end. The reason is that the height difference of the beams on both sides is small. If the slope is not increased, the steel pipe column needs to be equipped with partitions at the lower flange positions of the two corresponding beam heights. The spacing between the partitions is very small, which is not conducive to construction. If an internal partition is eliminated, the lower flange of the steel corbel at the position where the internal partition is not installed will exert a greater pressure on the steel pipe column, which is not conducive to the stress of the steel pipe column. Therefore, the height of the small beam on the left is increased by slope to the same height as the beam on the right, and a steel column partition is installed at the corresponding same position. This is more conducive to balancing the stress on the beams and columns on both sides, and the force transmission on both sides is direct; the slope gradient i≤1:3;
[0045] like Figure 6 As shown, when the top elevations of the reinforced concrete frame beams 2 on both sides of the rectangular steel tube concrete column 1 are different and the beam height difference is greater than 200 mm, four inner partitions 5 are set in the rectangular steel tube concrete column 1. The four inner partitions 5 are flush with the upper and lower end surfaces of the second-order upper flange steel brackets 3 in the reinforced concrete frame beams 2 on both sides;
[0046] The inner partition 5 is a rectangular plate structure, and its shape and size match the shape and size of the steel tube inner cavity of the rectangular steel tube concrete column 1; the four sides of the inner partition 5 are welded and fixed to the steel tube inner cavity of the rectangular steel tube concrete column 1; a grouting hole 10 is formed in the middle of the inner partition 5, and exhaust holes 11 are set at its four corners.
[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.
[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0049] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0050] The applicant declares that the above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present invention fall within the protection scope and disclosure scope of the present invention.
Claims
1. A connection node structure between a rectangular concrete-filled steel tube column and a reinforced concrete beam, characterized by: It comprises a rectangular steel tube concrete column (1) and at least one pair of reinforced concrete frame beams (2) connected to the rectangular steel tube concrete column (1), wherein the reinforced concrete frame beams (2) are connected to the rectangular steel tube concrete column (1) using a second-order upper flange steel corbel (3); The cross section of the second-order upper flange steel corbel (3) is an I-shaped structure, and its top surface is a second-order stepped surface; a plurality of outer-row beam upper reinforcements (6) and a plurality of second-row beam upper reinforcements (7) are welded above the top surface of the second-order upper flange steel corbel (3); a plurality of outer-row beam lower reinforcements (8) are welded above the bottom surface of the second-order upper flange steel corbel (3); a plurality of second-row beam lower reinforcements (9) are arranged above the bottom surface of the second-order upper flange steel corbel (3), and the second-row beam lower reinforcements (9) extend to the side wall of the rectangular steel tube concrete column (1) for bending and anchoring; The second-order upper flange steel corbel (3) is externally sleeved with beam stirrups (13); A plurality of beam waist reinforcements (14) are provided on both sides of the vertical beam of the second-order upper flange steel corbel (3), and two beam waist reinforcements (14) located on the same horizontal plane on both sides of the vertical beam of the second-order upper flange steel corbel (3) are connected by a tie bar (15).
2. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 1, characterized in that: One end of the second-order upper flange steel bracket (3) is welded and fixed to the rectangular steel tube concrete column (1).
3. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 1, characterized in that: The second-order upper flange steel corbel (3) is connected to the reinforced concrete frame beam (2) via a plurality of shear studs (4).
4. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 1, characterized in that: The side of the second-order upper flange steel corbel (3) close to the rectangular steel tube concrete column (1) is a first-order high top surface, and the side away from the rectangular steel tube concrete column (1) is a second-order low top surface, and the first-order high top surface and the second-order low top surface are smoothly connected by an inclined surface.
5. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 4, characterized in that: The ends of the outer row beam upper reinforcement (6) are welded and fixed to the first-order high top surface of the second-order upper flange steel corbel (3); and the ends of the second row beam upper reinforcement (7) are welded and fixed to the second-order low top surface of the second-order upper flange steel corbel (3).
6. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 1, characterized in that: The horizontal plane where the outer row beam lower reinforcement (8) is located is located below the horizontal plane where the second row beam lower reinforcement (9) is located. The end of the outer row beam lower reinforcement (8) is welded and fixed to the inner bottom surface of the second-order upper flange steel corbel (3), and the connection point between the outer row beam lower reinforcement (8) and the second-order upper flange steel corbel (3) is located below the second-order low top surface. The second row beam lower reinforcement (9) extends to the side wall of the rectangular steel tube concrete column (1) and is bent at a right angle for anchoring.
7. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 1, characterized in that: The outer row of beam upper reinforcement (6) and the second row of beam upper reinforcement (7) are both placed inside the beam stirrups (13).
8. The connection node structure of rectangular concrete-filled steel tube columns and reinforced concrete beams according to claim 1, characterized in that: The rectangular steel tube concrete column (1) consists of a steel tube and concrete filled in the steel tube; a plurality of inner partitions (5) are provided in the rectangular steel tube concrete column (1).
9. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 8, characterized in that: When the cross-sectional heights of the reinforced concrete frame beams (2) on both sides of the rectangular steel tube concrete column (1) are the same, two inner partitions (5) are provided in the rectangular steel tube concrete column (1), one inner partition (5) is flush with the upper end surface of the connection end of the second-order upper flange steel bracket (3) and the rectangular steel tube concrete column (1), and the other inner partition (5) is flush with the lower end surface of the connection end of the second-order upper flange steel bracket (3) and the rectangular steel tube concrete column (1); When the height difference of the reinforced concrete frame beams (2) on both sides of the rectangular steel tube concrete column (1) is not greater than 200 mm, two inner partitions (5) are provided in the rectangular steel tube concrete column (1), and the two inner partitions (5) are flush with the upper and lower end surfaces of the second-order upper flange steel bracket (3) in the reinforced concrete frame beam (2) with a larger beam cross-section; When the height difference of the cross-sections of the reinforced concrete frame beams (2) on both sides of the rectangular steel tube concrete column (1) is greater than 200 mm, four inner partitions (5) are provided in the rectangular steel tube concrete column (1), and the four inner partitions (5) are respectively flush with the upper and lower end surfaces of the second-order upper flange steel brackets (3) in the reinforced concrete frame beams (2) on both sides.
10. The connection node structure of rectangular steel tube concrete column and reinforced concrete beam according to claim 8, characterized in that: The inner partition (5) is a rectangular plate-shaped structure, and its shape and size match the shape and size of the steel tube inner cavity of the rectangular steel tube concrete column (1); the four sides of the inner partition (5) are welded and fixed to the steel tube inner cavity of the rectangular steel tube concrete column (1); a grouting hole (10) is formed in the middle of the inner partition (5), and exhaust holes (11) are provided at its four corners.