Multidirectional H-shaped steel beam and rectangular concrete filled steel tubular column oblique crossing assembly type joint

Abstract

The invention provides a multidirectional H-shaped steel beam and rectangular concrete filled steel tubular column oblique crossing assembly type node, which belongs to the technical field of assembly type beam column nodes, and comprises a rectangular concrete filled steel tubular column, an outer reinforcing ring, an H-shaped steel beam, a unilateral bolt for connection, a butt weld, a friction type high-strength bolt and a splicing cover plate, the bending moment of the beam end can be uniformly transmitted to the orthogonal direction of the rectangular steel pipe column, so that the rectangular steel pipe column is stressed more uniformly; by arranging the outer reinforcing ring, the anti-seismic performance of the joint can be improved; in addition, welding is not needed on a construction site, connection is conducted only through bolts, and modular construction of the multi-direction H-shaped steel beam and rectangular steel pipe concrete column oblique crossing joint can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated beam-column joints, and particularly to an inclined intersection prefabricated joint between multi-directional H-shaped steel beams and concrete-filled rectangular steel tubes. Background Art

[0002] In recent years, the state has introduced a series of policies to support the transformation of the construction industry, and the demands for industrialization, prefabrication, and intelligentization of the construction industry have been increasing day by day. Prefabricated structures have the advantages of convenient installation, reduced construction pollution, short construction period, resource conservation, improved labor efficiency, and enhanced construction quality. They are gradually replacing traditional cast-in-place concrete structures and traditional steel structures mainly based on welding, becoming the preferred building structure form.

[0003] Large complex buildings are characterized by large building sizes and multiple functions. There are many large-span, large overhang, high-rise, and super-high structures during the design process, resulting in diverse structural member forms and complex joint structures. In buildings with high space requirements, when H-shaped steel beams at different angles converge on a concrete column, there are problems such as complex structure, numerous welds, difficult welding construction, and hard-to-guarantee welding construction quality at the joint. The construction quality of complex joints directly affects the mechanical properties of the structure.

[0004] According to domestic and foreign research data, seismic damage to steel frame structures mainly occurs at the beam-column connections. The main failure form is the cracking of beam-column connection welds. The cracks mostly originate from the edge of the connection weld between the lower flange of the beam and the column and extend into the column. According to China's seismic design objectives, the seismic design of structures should meet the requirements of "strong columns and weak beams" and "strong joints and weak members". Filling concrete in steel tubes to form concrete-filled steel tubes can improve the strength of columns and the seismic performance of the connection joints between steel beams and concrete-filled steel tubes, which is a key issue in design. In addition, replacing the traditional welding connection form of beam-column joints with a bolt connection form to form a new joint prefabrication technology to improve the construction quality of joints is also an urgent problem to be solved.

[0005] In a building space with extremely high requirements for pipeline layout, there are a large number of crisscrossing pipes and lines. The circular surface of a concrete-filled circular steel tube is not conducive to the regular arrangement and fixed installation of pipelines. Circular columns require additional supports and complex fixing methods, increasing the difficulty and cost of pipeline installation, and being inconvenient for later maintenance and renovation.

[0006] The utility model patent with the application number 2023222591910 discloses a fully assembled flange connection node between a square / rectangular steel pipe column and an H-shaped steel beam. This solution effectively connects the square / rectangular steel pipe column and the H-shaped steel beam into a whole by using the node flange plate, strengthening the integrity of the structure and improving the bearing capacity of the node. Moreover, the core connection area of this solution's node is connected to the H-shaped steel beam through high-strength bolts. This connection area is relatively weak, ensuring the outward displacement of the plastic hinge and meeting the requirement of "strong column and weak beam" in the seismic code.

[0007] However, when encountering the above complex environment, the application environment of this solution is relatively single and it is difficult to meet the construction requirements. Summary of the Invention

[0008] The present invention provides an obliquely intersecting prefabricated joint between a multi-directional H-shaped steel beam and a rectangular concrete-filled steel tube column, which can not only meet the requirements of obliquely intersecting beam-column joints in actual projects, but also utilize a series of advantages of the prefabricated structure, and has a simple structure, convenient construction and strong applicability.

[0009] To solve the above problems, the obliquely intersecting prefabricated joint between a multi-directional H-shaped steel beam and a rectangular concrete-filled steel tube column provided by the present invention adopts the following technical solutions: a rectangular concrete-filled steel tube column, which includes a rectangular steel tube and the concrete poured inside the rectangular steel tube, and a number of bolt holes are evenly distributed on the rectangular steel tube;

[0010] An external strengthening ring, which is installed on the rectangular concrete-filled steel tube column and is used to connect the H-shaped steel beam;

[0011] An H-shaped steel beam, which is connected to the external strengthening ring by bolts;

[0012] It is characterized in that the external strengthening ring includes a number of external strengthening units, which are connected by bolts to form an annular structure, and the external strengthening units are connected to the rectangular concrete-filled steel tube column by bolts;

[0013] The external strengthening unit includes a vertically arranged connecting plate, an upper horizontal arc-shaped connecting plate, a lower horizontal arc-shaped connecting plate, two outer short stiffening plates and an inner short stiffening plate arranged between the two outer short stiffening plates, and at least one inner short stiffening plate is provided;

[0014] Four external strengthening units are provided.

[0015] As a further improvement, a number of bolt holes are opened on the outer short stiffening plate, and the outer short stiffening plates between adjacent two external strengthening units are connected by friction-type high-strength bolts.

[0016] As a further improvement, the outer short stiffening plate and the inner short stiffening plate are connected to the upper horizontal arc connecting plate and the lower horizontal arc connecting plate by butt welds; the outer short stiffening plate and the inner short stiffening plate are connected to the vertical connecting plate by butt welds; the upper horizontal arc connecting plate and the lower horizontal arc connecting plate are connected to the vertical connecting plate by butt welds.

[0017] As a further improvement, bolt holes are provided on the vertical connecting plate and are connected to the outer rectangular steel pipe of the rectangular concrete-filled steel tube column through single-sided bolts.

[0018] As a further improvement, bolt holes are provided on the upper horizontal arc connecting plate, the lower horizontal arc connecting plate and the inner short stiffening plate; the upper horizontal arc connecting plate, the lower horizontal arc connecting plate and the inner short stiffening plate are connected to the H-shaped steel beam in cooperation with friction-type high-strength bolts and splicing cover plates.

[0019] As a further improvement, the outer strengthening unit is divided into two types according to whether the inner short stiffening plate is configured as a single plate or a double plate, namely the outer strengthening unit with a single-plate configuration and the outer strengthening unit with a double-plate configuration; there are two ways for the outer strengthening units to form an outer strengthening ring, namely a positive placement and an inclined placement, namely a positive-placement outer strengthening ring and an inclined-placement outer strengthening ring;

[0020] When the skew angle between the H-shaped steel beam and the rectangular concrete-filled steel tube column is 30° - 45°, the outer strengthening unit with a single-plate configuration is selected and a positive-placement combination method is adopted to form a positive-placement outer strengthening ring;

[0021] When the skew angle between the H-shaped steel beam and the rectangular concrete-filled steel tube column is 0° - 15°, the outer strengthening unit with a single-plate configuration is selected and an inclined-placement combination method is adopted to form an inclined-placement outer strengthening ring;

[0022] When the skew angle between the H-shaped steel beam and the rectangular concrete-filled steel tube column is greater than 15° and less than 30°, the outer strengthening unit with a double-plate configuration is selected, and a positive-placement or inclined-placement combination method can be adopted to form a positive-placement outer strengthening ring or an inclined-placement outer strengthening ring.

[0023] The beneficial effects of the above technical solutions of the present invention are as follows:

[0024] 1. In the construction site of the present invention, welding is not required, and only bolt connection is used, which can realize the modular construction of the multi-directional skew joint of the H-shaped steel beam and the rectangular concrete-filled steel tube column.

[0025] In the construction site, it is only necessary to align the bolt holes pre-set on workpieces such as the rectangular concrete-filled steel tube column, the outer strengthening unit, and the H-shaped steel beam, and then tighten the bolts to complete the connection. There is no need for professional welding equipment and technicians to perform on-site welding like welding, which can effectively shorten the construction time, improve the construction efficiency. Moreover, the installation accuracy and connection reliability are higher, and the quality is easy to inspect.

[0026] 2. The external strengthening unit of the present invention can be combined into different types of external strengthening rings according to the skew angle between the H-shaped steel beam and the rectangular concrete-filled steel tube column, which can evenly transfer the beam-end moment to the orthogonal direction of the rectangular concrete-filled steel tube column, making the stress of the rectangular concrete-filled steel tube column more uniform and better adapting to the complex design of large-scale comprehensive buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0028] Figure 1 Schematic diagram of the overall structure of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention Figure 1 ;

[0029] Figure 2 Schematic diagram of the overall structure of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention Figure 2 ;

[0030] Figure 3 Front view of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0031] Figure 4 Top view of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the external strengthening ring of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the external strengthening unit of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0034] Figure 7 Schematic diagram of the connection between the external strengthening unit and the rectangular concrete-filled steel tube column of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0035] Figure 8 Schematic diagram of the structure of the external strengthening unit type 1 of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0036] Figure 9 Schematic diagram of the structure of the external strengthening unit type 2 of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint of the present invention;

[0037] Figure 10 This is a schematic structural diagram of the external strengthening unit type 3 of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0038] Figure 11 This is a schematic structural diagram of the external strengthening unit type 4 of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0039] Figure 12 This is a schematic structural diagram of the external strengthening unit type 5 of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0040] Figure 13 This is a schematic structural diagram of the orthotropic external strengthening unit with single plate configuration of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0041] Figure 14 This is a schematic structural diagram of the obliquely placed external strengthening unit with single plate configuration of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0042] Figure 15 This is a schematic structural diagram of the orthotropic external strengthening unit with single plate configuration and the orthotropic external strengthening unit with double plate configuration of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0043] Figure 16 This is a schematic structural diagram of the obliquely placed external strengthening unit with single plate configuration and the obliquely placed external strengthening unit with double plate configuration of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention;

[0044] Figure 17 This is a schematic connection diagram of the external strengthening unit of the skew assembled joint between the multi-directional H-shaped steel beam and the rectangular concrete-filled steel tube column of the present invention and the H-shaped steel beam.

[0045] Explanation of reference numerals:

[0046] 1. Rectangular concrete-filled steel tube column; 2. External strengthening ring; 3. External strengthening unit; 4. Vertical connecting plate; 5. Upper horizontal arc connecting plate; 6. Lower horizontal arc connecting plate; 7. Outer short stiffening plate; 8. Inner short stiffening plate; 9. H-shaped steel beam; 10. Unilateral bolt; 11. Butt weld; 12. Friction type high-strength bolt; 13. Splice cover plate. Detailed implementation manners

[0047] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0048] Large complex buildings are characterized by large building sizes and multiple functions. During the design process, there are many large-span, large cantilever, high-rise and super-high structures, resulting in diverse structural member forms and complex joint structures. When H-shaped steel beams at different angles converge on a rectangular concrete-filled steel tube column, there are problems such as complex structures, many welds, difficult welding construction, and difficult to guarantee welding construction quality at the joint.

[0049] Regarding the above problems, the present invention designs two types of external strengthening units, namely the external strengthening unit with single-board configuration and the external strengthening unit with double-board configuration; according to the placement form of the external strengthening unit, it is divided into the directly placed external strengthening ring and the obliquely placed external strengthening ring. Finally, according to the different skew angles between the H-shaped steel beam and the rectangular concrete-filled steel tube column, the corresponding external strengthening unit is selected to form an external strengthening ring, so that the beam end moment is more evenly transferred to the orthogonal direction of the rectangular steel tube column, making the force on the rectangular steel tube column more uniform.

[0050] After introducing the basic principle of the present invention, the various non-limiting embodiments of the present invention will be specifically introduced below. The number of any element in the accompanying drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0051] Next, with reference to several representative embodiments of the present invention, the principles and spirits of the present invention will be elaborated in detail.

[0052] Embodiment 1 of the multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint provided by the present invention:

[0053] As Figures 1 - 17 shown, it includes a rectangular concrete-filled steel tube column 1, an external strengthening ring 2, an H-shaped steel beam 9, and one-sided bolts 10 for connection, butt welds 11, friction-type high-strength bolts 12, and splicing cover plates 13.

[0054] As Figures 1 - 4 shown, the rectangular concrete-filled steel tube column 1 includes an external rectangular steel tube and internally poured concrete. Bolt holes are provided on the external rectangular steel tube to facilitate subsequent connection of the external strengthening ring 2 thereto through one-sided bolts 10; the concrete is poured into the rectangular steel tube after the installation of the one-sided bolts 10 is completed.

[0055] As Figure 5As shown, the external stiffening ring 2 includes four external stiffening units 3. Bolt holes are provided on the outer short stiffening plates 7 of the external stiffening units 3. Two adjacent external stiffening units 3 can be connected together by friction-type high-strength bolts 12 to form the external stiffening ring 2.

[0056] As Figure 6 shown, the external stiffening unit 3 includes a vertical connecting plate 4, an upper horizontal arc connecting plate 5, a lower horizontal arc connecting plate 6, an outer short stiffening plate 7 and an inner short stiffening plate 8. The outer short stiffening plate 7 and the inner short stiffening plate 8 are connected to the upper horizontal arc connecting plate 5 and the lower horizontal arc connecting plate 6 by butt welds 11. The outer short stiffening plate 7 and the inner short stiffening plate 8 are connected to the vertical connecting plate 4 by butt welds. The upper horizontal arc connecting plate 5 and the lower horizontal arc connecting plate 6 are connected to the vertical connecting plate 4 by butt welds 11.

[0057] As Figure 7 shown, bolt holes are provided on the vertical connecting plate 4 of the external stiffening unit 3, and it is connected to the external rectangular steel pipe of the rectangular concrete-filled steel tube column 1 by a single-sided bolt 10.

[0058] As Figures 8 - 12 shown, the external stiffening unit 3 is divided into five types according to the different skew angles of the multi-directional H-shaped steel beam 9.

[0059] When the inner short stiffening plate 8 is configured as a single plate: when the included angle between the inner short stiffening plate 8 and the outer short stiffening plate 7 is 30°, it is type 1, as Figure 8 shown;

[0060] when the included angle between the inner short stiffening plate 8 and the outer short stiffening plate 7 is 35°, it is type 2, as Figure 9 shown;

[0061] when the included angle between the inner short stiffening plate 8 and the outer short stiffening plate 7 is 40°, it is type 3, as Figure 10 shown;

[0062] when the included angle between the inner short stiffening plate 8 and the outer short stiffening plate 7 is 45°, it is type 4, as Figure 11 shown.

[0063] When the inner short stiffening plate 8 is configured as a double plate: when the included angles between the two inner short stiffening plates 8 and the two outer short stiffening plates 7 are 20° and 25° respectively, it is type 5, as ​ shown.

[0064] As ​ shown, the selection and combination of different types of external stiffening units 3 need to be determined according to the skew angle of the multi-directional H-shaped steel beam 9.

[0065] When the skew angle between the H-shaped steel beam 9 and the concrete-filled rectangular steel tubular column 1 is relatively large, ranging from 30° to 45°, generally, the externally strengthened unit 3 with single-plate configuration, type 1 - 4, is selected, and the combined form of the positive placement is adopted to form the positive-placement externally strengthened ring 2;

[0066] When the skew angle between the H-shaped steel beam 9 and the concrete-filled rectangular steel tubular column 1 is relatively small, ranging from 0° to 15°, generally, the externally strengthened unit 3 with single-plate configuration, type 1 - 4, is selected, and the combined form of the inclined placement is adopted to form the inclined-placement externally strengthened ring 2;

[0067] When the skew angle between the H-shaped steel beam 9 and the concrete-filled rectangular steel tubular column 1 is greater than 15° and less than 30°, generally, the externally strengthened unit 3 with double-plate configuration, type 5, is selected, and the combined form of the positive placement or the inclined placement can be adopted to form the positive-placement externally strengthened ring 2 or the inclined-placement externally strengthened ring 2.

[0068] For example: when the skew angles of the four H-shaped steel beams 9 at the beam-column joint are 30°, 35°, 40° and 45° respectively, the externally strengthened unit 3 with single-plate configuration and positive placement, type 1, 2, 3, 4, is selected, and the combined form is as ​ shown.

[0069] When the skew angles of the four H-shaped steel beams 9 at the beam-column joint are 0°, 5°, 10° and 15° respectively, the externally strengthened unit 3 with single-plate configuration and inclined placement, type 4, 3, 2, 1, is selected, and the combined form is as ​ shown.

[0070] When the skew angles of the four H-shaped steel beams 9 at the beam-column joint are 30°, 45°, 20° and 25° respectively, the externally strengthened unit 3 with single-plate configuration and positive placement and the externally strengthened unit 3 with double-plate configuration and positive placement, type 1, 4, 5, 5, are selected, and the combined form is as ​ shown.

[0071] When the skew angles of the four H-shaped steel beams 9 at the beam-column joint are 5°, 15°, 20° and 25° respectively, the externally strengthened unit 3 with single-plate configuration and inclined placement and the externally strengthened unit 3 with double-plate configuration and inclined placement, type 3, 1, 5, 5, are selected, and the combined form is as ​ shown.

[0072] As ​ shown, bolt holes are provided on the upper horizontal arc connecting plate 5, the lower horizontal arc connecting plate 6 and the inner short stiffening plate 8 of the externally strengthened unit 3. Cooperating with the friction-type high-strength bolts 12 and the splicing cover plate 13, the multi-directional H-shaped steel beam 9 can be connected to the externally strengthened unit 3.

[0073] As ​As shown, the multi-directional H-shaped steel beam 9 includes steel beams i (i = 1, 2, ……, n) with different skew angles, and the cross-section of each steel beam i is H-shaped. Bolt holes are provided on the upper flange and are connected to the upper horizontal arc-shaped connecting plate 5 of the outer strengthening unit 3 through friction-type high-strength bolts 12 and splicing cover plates 13; bolt holes are provided on the lower flange and are connected to the lower horizontal arc-shaped connecting plate 6 of the outer strengthening unit 3 through friction-type high-strength bolts 12 and splicing cover plates 13; bolt holes are provided on the web and are connected to the inner short stiffening plate 8 of the outer strengthening unit 3 through friction-type high-strength bolts 12 and splicing cover plates 13.

[0074] Although this specification has shown and described multiple embodiments of the present invention, it is obvious to those skilled in the art that such embodiments are provided only by way of example. Those skilled in the art will think of many changes, alterations, and alternative ways without departing from the spirit and idea of the present invention. It should be understood that various alternative solutions of the embodiments of the present invention described herein can be adopted in the process of practicing the present invention. The appended claims are intended to define the protection scope of the present invention and thus cover the module compositions, equivalents, or alternative solutions within the protection scope of these claims.

Claims

1. A multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint, comprising: A rectangular concrete-filled steel tube column (1), which includes a rectangular steel tube and the cast-in concrete inside the rectangular steel tube, and a number of bolt holes are evenly distributed on the rectangular steel tube; An external strengthening ring (2), which is installed on the rectangular concrete-filled steel tube column (1), and the external strengthening ring (2) is used to connect the H-shaped steel beam (9); An H-shaped steel beam (9), and the H-shaped steel beam (9) is connected to the external strengthening ring (2) by bolts; It is characterized in that the external strengthening ring (2) includes a number of external strengthening units (3), and the external strengthening units (3) are connected by bolts to form an annular structure, and the external strengthening units (3) are connected to the rectangular concrete-filled steel tube column (1) by bolts; The external strengthening unit (3) includes a vertical connecting plate (4), an upper horizontal arc connecting plate (5), a lower horizontal arc connecting plate (6), two outer short stiffening plates (7) and an inner short stiffening plate (8) arranged between the two outer short stiffening plates (7), and at least one inner short stiffening plate (8) is provided; There are four external strengthening units (3).

2. The multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint according to claim 1, characterized in that: A number of bolt holes are provided on the outer short stiffening plate (7), and the outer short stiffening plates (7) between adjacent two external strengthening units (3) are connected by friction type high-strength bolts (12).

3. The multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint according to claim 2, characterized in that: The outer short stiffening plate (7) and the inner short stiffening plate (8) are connected to the upper horizontal arc connecting plate (5) and the lower horizontal arc connecting plate (6) by butt welds (11); the outer short stiffening plate (7) and the inner short stiffening plate (8) are connected to the vertical connecting plate (4) by butt welds; the upper horizontal arc connecting plate (5) and the lower horizontal arc connecting plate (6) are connected to the vertical connecting plate (4) by butt welds (11).

4. The multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint according to claim 3, characterized in that: Bolt holes are provided on the vertical connecting plate (4), and it is connected to the external rectangular steel tube of the rectangular concrete-filled steel tube column (1) by single-sided bolts (10).

5. The multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint according to claim 4, characterized in that: Bolt holes are provided on the upper horizontal arc connecting plate (5), the lower horizontal arc connecting plate (6) and the inner short stiffening plate (8); the upper horizontal arc connecting plate (5), the lower horizontal arc connecting plate (6) and the inner short stiffening plate (8), in cooperation with friction type high-strength bolts (12) and splicing cover plates (13), are connected to the H-shaped steel beam (9).

6. The multi-directional H-shaped steel beam and rectangular concrete-filled steel tube column skew assembled joint according to any one of claims 1 to 5, characterized in that: The external strengthening unit (3) is divided into two types according to whether the inner short stiffening plate (8) is configured as a single plate or a double plate, namely the external strengthening unit (3) with a single plate configuration and the external strengthening unit (3) with a double plate configuration; there are two ways for the external strengthening units (3) to form the external strengthening ring (2), namely the external strengthening ring (2) placed upright and the external strengthening ring (2) placed obliquely; When the skew angle between the H-shaped steel beam (9) and the rectangular concrete-filled steel tube column (1) is 30° - 45°, the external strengthening unit (3) with a single plate configuration is selected, and the external strengthening ring (2) placed upright is formed by using the combination method of placing upright; When the skew angle between the H-shaped steel beam (9) and the rectangular concrete-filled steel tube column (1) is 0° - 15°, the external strengthening unit (3) with a single plate configuration is selected, and the external strengthening ring (2) placed obliquely is formed by using the combination method of placing obliquely; When the skew angle between the H-shaped steel beam (9) and the rectangular concrete-filled steel tube column (1) is greater than 15° and less than 30°, the outer strengthening unit (3) with double-plate configuration can be selected, and it is acceptable to form the orthotropic outer strengthening ring (2) or the skew outer strengthening ring (2) by adopting a combined form of orthotropic placement or skew placement.

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