A rigid connection node for converting concrete beams into steel columns

Abstract

The present invention belongs to the field of construction engineering technology and is a rigid connection node for converting concrete beams into steel columns. The technical solution comprises a box-shaped steel column or an H-shaped steel column, a short horizontal steel section, and a converted concrete beam. The box-shaped steel column or the H-shaped steel column is inserted into a cross-orthogonal converted concrete beam, and the four front, rear, left, and right sides of the lower end of the inserted section of the box-shaped steel column or the H-shaped steel column are connected to short horizontal steel sections. The short horizontal steel sections are embedded in the converted concrete beam and placed centrally. Upper longitudinal reinforcement, lower longitudinal reinforcement, torsional waist reinforcement, and stirrups are provided inside the concrete beam. By connecting the short horizontal steel sections to the sides around the base of the steel column and embedding them in the converted concrete beam, the internal force of the steel column can be effectively transferred to the converted concrete beam, achieving the refined design requirements of the strong node at the base of the steel structure column. The short horizontal steel sections are embedded in only a small length of the converted concrete beam, avoiding the interlacing of beam-column node steel sections and reinforcement, reducing construction difficulty, saving steel usage, and lowering construction costs.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, in particular to a rigid connection node for converting a concrete beam into a steel column. Background Art

[0002] Prefabricated buildings, with their advantages of factory-based processing, fast on-site construction, and environmental friendliness, have become widely used in public and residential buildings. As a major structural form, steel structures, with their prefabricated and assembled characteristics, have become a major trend in domestic building structure development. While steel structures offer significant advantages for above-ground construction, they are still primarily constructed using reinforced concrete due to the damp and corrosive underground environment. Therefore, the use of steel structures for above-ground structures and reinforced concrete for basements will become increasingly common.

[0003] Due to the differences in the functions of above-ground and underground buildings and the differences in column grids, the above-ground steel columns often cannot fall to the foundation bottom plate, and it is necessary to convert them through reinforced concrete beams on the basement top plate.

[0004] Above-ground steel structures bear vertical gravity loads, horizontal wind loads, and seismic loads, all of which are transmitted to the lower foundation through the columns. The safety and reliability of the column foot joints are a prerequisite for ensuring the safety of the superstructure. Current structural design specifications for steel structure column footings require that the column foot joints should not fail before the column itself under moderate or severe earthquakes.

[0005] To meet the requirements for strong joints at the base of steel columns, the conventional structural design approach for above-ground conversion steel columns is to use steel-concrete beams, which essentially connect the entire steel beam. This approach, in addition to requiring excessive steel and lacking detailed design, also presents construction challenges such as interlaced steel and rebar at the beam-column joints, the heavy weight of embedded steel, and difficulty in hoisting, increasing project costs and complexity. Summary of the Invention

[0006] To address the shortcomings of the prior art, the present invention, based on theoretical analysis and full-scale test verification, provides a rigid connection for converting concrete beams to steel columns. This connection reduces steel usage, facilitates construction, shortens construction time, overcomes existing technical bottlenecks, and offers a simple design.

[0007] The technical solutions of the present invention are as follows:

[0008] Technical Solution 1: A rigid connection node for converting a concrete beam into a steel column, comprising a box-shaped steel column, a short horizontal steel section and a conversion concrete beam; the box-shaped steel column is inserted into a cross-orthogonal conversion concrete beam, and the front, rear, left and right sides of the lower end of the inserted section of the box-shaped steel column are connected to short horizontal steel sections; the short horizontal steel sections are pre-embedded in the conversion concrete beam; in the inner cavity of the box-shaped steel column, horizontal inner partitions are provided at positions corresponding to the upper and lower flanges of the short horizontal steel sections and the upper longitudinal reinforcement of the conversion concrete beam, and a hole is opened in the center of the horizontal inner partition for pouring concrete.

[0009] Technical Solution 2: A rigid connection node for converting a concrete beam into a steel column, comprising an H-shaped steel column, a short horizontal steel section and a conversion concrete beam; the H-shaped steel column is inserted into a cross-orthogonal conversion concrete beam, and the front, rear, left and right sides of the lower end of the inserted section of the H-shaped steel column are connected with short horizontal steel sections; the short horizontal steel sections are embedded in the conversion concrete beam; horizontal partitions are provided between the column flanges of the H-shaped steel column, at positions corresponding to the upper and lower flanges of the short horizontal steel sections and the upper longitudinal reinforcement of the conversion concrete beam.

[0010] Based on the above technical features: upper longitudinal reinforcement, lower longitudinal reinforcement and torsional waist reinforcement are arranged inside the conversion concrete beam, and rectangular stirrups and diamond stirrups are arranged between the upper longitudinal reinforcement and the lower longitudinal reinforcement.

[0011] Based on the above technical features: the horizontal short steel section has an H-shaped cross-section; multiple studs are welded on the upper surface of the upper flange, the lower surface of the lower flange and both sides of the web of the horizontal short steel section, and the studs are evenly arranged along the length direction of the horizontal short steel section.

[0012] Based on the above technical features: the horizontal short steel sections are embedded in the center of the conversion concrete beam, the horizontal short steel sections are not less than 250 mm away from the top and bottom of the conversion concrete beam, and the horizontal short steel sections are not less than 150 mm away from the sides of the conversion concrete beam.

[0013] Based on the above technical features: the length of the horizontal short steel section extending from the side of the box-shaped steel column is not less than 2 times the cross-sectional height of the box-shaped steel column in the same direction, the cross-sectional height of the horizontal short steel section is not less than the cross-sectional height of the box-shaped steel column in the same direction, and the thickness of the upper and lower flanges of the horizontal short steel section is not less than the wall panel thickness of the connected box-shaped steel column.

[0014] Based on the above technical features: the length of the horizontal short steel extending from the side of the H-shaped steel column is not less than 2 times the cross-sectional height of the H-shaped steel column in the same direction, the cross-sectional height of the horizontal short steel is not less than the cross-sectional height of the H-shaped steel column in the same direction, and the upper and lower flange thicknesses of the horizontal short steel are not less than the flange thickness of the H-shaped steel column.

[0015] Based on the above technical features: the upper longitudinal reinforcement is fixed to the wall panel of the box-shaped steel column through a sleeve connection.

[0016] Based on the above technical features: in the weak axis direction of the H-shaped steel column, the upper longitudinal reinforcement is fixed to the column flange of the H-shaped steel column through a sleeve connection; in the strong axis direction of the H-shaped steel column, the upper longitudinal reinforcement is connected and fixed to the H-shaped steel column through a horizontal partition.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Technological advancement. By connecting short horizontal steel sections around the base of the steel column and pre-embedding them in the transfer concrete beam, the internal forces of the steel column can be effectively transferred to the transfer concrete beam, achieving the refined design requirements for strong joints at the base of the steel structure column, and ensuring that the column base joint should not fail before the column itself under moderate or severe earthquakes.

[0019] 2. Convenient construction. The short horizontal steel sections are embedded within a small section of the transfer concrete beam, eliminating the interlacing of beam-column joint steel and rebar, reducing construction difficulty and facilitating project quality control. Furthermore, the small connecting steel sections embedded within the transfer beam are lightweight, making them relatively easy to transport and hoist.

[0020] 3. Engineering economy: The rigid connection node of the concrete beam-to-steel column conversion of the present invention eliminates the need for through-section steel in the conversion concrete beam, thereby saving steel material and reducing engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic elevation view of the first embodiment of the present invention.

[0022] Figure 2 It is a schematic top view of embodiment 1 of the present invention.

[0023] Figure 3 This is embodiment 1 of the present invention Figure 1 Schematic diagram of section II.

[0024] Figure 4 This is embodiment 1 of the present invention Figure 1 Schematic diagram of the II-II section.

[0025] Figure 5 It is a schematic top view of the second embodiment of the present invention.

[0026] Figure 6 This is a schematic elevation view of the third embodiment of the present invention.

[0027] Figure 7 This is a schematic top view of embodiment 3 of the present invention.

[0028] Figure 8 This is the third embodiment of the present invention Figure 6 Schematic diagram of section III-III.

[0029] Figure 9This is the third embodiment of the present invention Figure 6 Schematic diagram of section IV-IV.

[0030] Figure 10 This is a schematic top view of the fourth embodiment of the present invention.

[0031] Part Number Description

[0032] 1 Box-shaped steel column

[0033] 2 Horizontal short steel

[0034] 3 studs

[0035] 4 Conversion concrete beams

[0036] 5 Horizontal inner partition

[0037] 6. Concrete

[0038] 7 H-shaped steel column

[0039] 8 horizontal partitions

[0040] 9 sleeve

[0041] 10 Upper longitudinal ribs

[0042] 11 Lower longitudinal ribs

[0043] 12 Anti-torsion lumbar muscles

[0044] 13 rectangular stirrups

[0045] 14 Diamond stirrups DETAILED DESCRIPTION

[0046] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0049] Example 1

[0050] like Figures 1 to 4 As shown, a rigid connection node of a concrete beam-to-steel column conversion comprises a box-shaped steel column 1, a horizontal short steel section 2 and a conversion concrete beam 4; the box-shaped steel column 1 is inserted into the cross-orthogonal conversion concrete beam 4, and the front, rear, left and right sides of the lower end of the insertion section of the box-shaped steel column 1 are connected with horizontal short steel sections 2; the horizontal short steel sections 2 are pre-embedded in the conversion concrete beam 4; upper longitudinal reinforcement 10 is provided on the upper side of the interior of the concrete beam 4, lower longitudinal reinforcement 11 is provided on the lower side of the interior of the concrete beam 4, and anti-torsion waist reinforcement 12 is provided on the side of the interior of the concrete beam 4, and rectangular stirrups 13 and diamond stirrups 14 are provided between the upper longitudinal reinforcement 10 and the lower longitudinal reinforcement 11; in the inner cavity of the box-shaped steel column 1, horizontal inner partitions 5 are provided at positions corresponding to the upper and lower flanges of the horizontal short steel section 2 and the upper longitudinal reinforcement 10, and the center of the horizontal inner partition 5 is opened for pouring concrete 6.

[0051] The horizontal short steel section 2 has an H-shaped cross section, and a plurality of studs 3 are welded to the upper surface of the upper flange, the lower surface of the lower flange and both sides of the web. The studs 3 are evenly arranged along the length direction of the horizontal short steel section 2.

[0052] The horizontal short steel section 2 is embedded in the center of the conversion concrete beam 4. The horizontal short steel section 2 is not less than 250 mm away from the top and bottom of the conversion concrete beam 4, and the horizontal short steel section 2 is not less than 150 mm away from the sides of the conversion concrete beam 4. This can prevent the conversion concrete beam 4 from being damaged by the squeezing and shearing of the steel sections at the upper and lower flange positions of the horizontal short steel section 2, and meet the construction structural requirements.

[0053] The length of the horizontal short steel section 2 extending from the side of the box-shaped steel column 1 is not less than twice the cross-sectional height of the box-shaped steel column 1 in the same direction, the cross-sectional height of the horizontal short steel section 2 is not less than the cross-sectional height of the box-shaped steel column 1 in the same direction, and the thickness of the upper and lower flanges of the horizontal short steel section 2 is not less than the thickness of the wall panel of the connected box-shaped steel column 1. According to theoretical analysis and full-scale test verification, the length and cross-sectional parameters of the horizontal short steel section 2 can meet the requirements of reliable column foot embedding stiffness and bearing capacity of the upper box-shaped steel column 1, and can effectively transfer the internal force of the box-shaped steel column 1 to the conversion concrete beam 4. According to the test results, cracks develop significantly on the theoretical punching surface where the corner of the horizontal short steel section 2 is parallel to the diamond stirrups 14; no obvious cracks appear on the theoretical punching surface where the corner of the horizontal short steel section 2 intersects with the diamond stirrups 14, indicating that the diamond stirrups 14 have a significant anti-cracking effect.

[0054] The upper longitudinal reinforcement 10 is connected and fixed to the wall plate of the box-shaped steel column 1 through the sleeve 9.

[0055] Example 2

[0056] The structure of this embodiment is basically the same as that of the first embodiment, and the difference from the first embodiment is that:

[0057] like Figure 5 As shown, when the conversion concrete beam 4 meets the load-bearing conditions, the horizontal short steel section 2 is locally armpited in the beam width direction to meet the distance requirement from the edge of the conversion concrete beam 4.

[0058] Example 3

[0059] like Figures 6 to 9 As shown, a new type of rigid connection node for converting concrete beams into steel columns comprises an H-shaped steel column 7, a horizontal short steel 2 and a converted concrete beam 4; the characteristics are as follows: the H-shaped steel column 7 is inserted into the cross-orthogonal converted concrete beam 4, and the four front, rear, left and right sides of the lower end of the inserted section of the H-shaped steel column 7 are connected with horizontal short steels 2; the horizontal short steels 2 are pre-buried in the converted concrete beam 4; upper longitudinal reinforcement 10 is provided on the upper side of the interior of the concrete beam 4, lower longitudinal reinforcement 11 is provided on the lower side of the interior of the concrete beam 4, anti-torsion waist reinforcement 12 is provided on the side of the interior of the concrete beam 4, and rectangular stirrups 13 and diamond stirrups 14 are provided between the upper longitudinal reinforcement 10 and the lower longitudinal reinforcement 11; horizontal partitions 8 are provided between the column flanges of the H-shaped steel column 7 and at positions corresponding to the upper and lower flanges of the horizontal short steel 2 and the upper longitudinal reinforcement 10.

[0060] The horizontal short steel section 2 has an H-shaped cross section, and a plurality of studs 3 are welded to the upper surface of the upper flange, the lower surface of the lower flange and both sides of the web. The studs 3 are evenly arranged along the length direction of the horizontal short steel section 2.

[0061] The horizontal short steel section 2 is embedded in the center of the conversion concrete beam 4. The horizontal short steel section 2 is not less than 250 mm away from the top and bottom of the conversion concrete beam 4, and the horizontal short steel section 2 is not less than 150 mm away from the sides of the conversion concrete beam 4. This can prevent the conversion concrete beam 4 from being damaged by the squeezing and shearing of the steel sections at the upper and lower flange positions of the horizontal short steel section 2, and meet the construction structural requirements.

[0062] The length of the horizontal short steel section 2 extending from the side of the H-shaped steel column 7 is not less than twice the cross-sectional height of the H-shaped steel column 7 in the same direction, the cross-sectional height of the horizontal short steel section 2 is not less than the cross-sectional height of the H-shaped steel column 7 in the same direction, and the upper and lower flange thicknesses of the horizontal short steel section 2 are not less than the flange thicknesses of the H-shaped steel column 7. According to theoretical analysis and full-scale test verification, the length and cross-sectional parameters of the horizontal short steel section 2 can meet the requirements for reliable column foot embedding stiffness and bearing capacity of the upper H-shaped steel column 7, and can effectively transmit the internal force of the H-shaped steel column 7 to the conversion concrete beam 4. According to the test results, cracks develop significantly on the theoretical shear surface where the corner of the horizontal short steel section 2 is parallel to the diamond stirrups 14; no obvious cracks appear on the theoretical shear surface where the corner of the horizontal short steel section 2 intersects with the diamond stirrups 14, indicating that the diamond stirrups 14 have a significant anti-cracking effect.

[0063] In the weak axis direction of the H-shaped steel column 7, the upper longitudinal reinforcement 10 is connected and fixed to the column flange of the H-shaped steel column 7 through the sleeve 9; in the strong axis direction of the H-shaped steel column 7, the longitudinal reinforcement 10 is connected and fixed to the H-shaped steel column 7 through the horizontal partition 8.

[0064] Example 4

[0065] The structure of this embodiment is basically the same as that of the third embodiment, and the difference from the third embodiment is that:

[0066] like Figure 10 As shown, when the conversion concrete beam 4 meets the load-bearing conditions, the horizontal short steel section 2 is locally armpited in the beam width direction to meet the distance requirement from the edge of the conversion concrete beam 4.

[0067] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the embodiments described herein. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A rigid connection node for converting concrete beams into steel columns, characterized by: The invention comprises a box-shaped steel column (1), a horizontal short steel section (2) and a conversion concrete beam (4); the box-shaped steel column (1) is inserted into the cross-orthogonal conversion concrete beam (4), and the four sides of the front, rear, left and right sides of the lower end of the insertion section of the box-shaped steel column (1) are connected to the horizontal short steel section (2); the horizontal short steel section (2) is pre-buried in the conversion concrete beam (4); in the inner cavity of the box-shaped steel column (1), horizontal inner partitions (5) are provided at positions corresponding to the upper and lower flanges of the horizontal short steel section (2) and the upper longitudinal reinforcement (10) of the conversion concrete beam (4), and the central opening of the horizontal inner partition (5) is used for pouring concrete (6); The upper longitudinal reinforcement (10), the lower longitudinal reinforcement (11) and the torsional waist reinforcement (12) are arranged inside the conversion concrete beam (4); rectangular stirrups (13) and diamond stirrups (14) are sleeved between the upper longitudinal reinforcement (10) and the lower longitudinal reinforcement (11); and the diamond stirrups (14) are arranged around the horizontal short steel section (2); The horizontal short steel section (2) has an H-shaped cross section; a plurality of studs (3) are welded to the upper surface of the upper flange, the lower surface of the lower flange and both sides of the web of the horizontal short steel section (2), and the studs (3) are evenly arranged along the length direction of the horizontal short steel section (2); The horizontal short steel section (2) is embedded in the conversion concrete beam (4) and placed in the center. The distance between the horizontal short steel section (2) and the top and bottom of the conversion concrete beam (4) is not less than 250 mm, and the distance between the horizontal short steel section (2) and the side of the conversion concrete beam (4) is not less than 150 mm. The length of the horizontal short steel (2) extending from the side of the box-shaped steel column (1) is not less than twice the cross-sectional height of the box-shaped steel column (1) in the same direction, the cross-sectional height of the horizontal short steel (2) is not less than the cross-sectional height of the box-shaped steel column (1) in the same direction, and the thickness of the upper and lower flanges of the horizontal short steel (2) is not less than the thickness of the wall panel of the connected box-shaped steel column (1).

2. The rigid connection node for converting a concrete beam to a steel column according to claim 1, characterized in that: The upper longitudinal reinforcement (10) is connected and fixed to the wall panel of the box-shaped steel column (1) through a sleeve (9).

3. A rigid connection node for converting concrete beams into steel columns, characterized by: The invention comprises an H-shaped steel column (7), a horizontal short steel section (2) and a conversion concrete beam (4); the H-shaped steel column (7) is inserted into the cross-orthogonal conversion concrete beam (4), and the four sides of the front, rear, left and right sides of the lower end of the insertion section of the H-shaped steel column (7) are connected to the horizontal short steel section (2); the horizontal short steel section (2) is pre-buried in the conversion concrete beam (4); horizontal partitions (8) are provided between the column flanges of the H-shaped steel column (7) and at positions corresponding to the upper and lower flanges of the horizontal short steel section (2) and the upper longitudinal reinforcement (10) of the conversion concrete beam (4); The upper longitudinal reinforcement (10), the lower longitudinal reinforcement (11) and the torsional waist reinforcement (12) are arranged inside the conversion concrete beam (4); rectangular stirrups (13) and diamond stirrups (14) are sleeved between the upper longitudinal reinforcement (10) and the lower longitudinal reinforcement (11); and the diamond stirrups (14) are arranged around the horizontal short steel section (2); The horizontal short steel section (2) has an H-shaped cross section; a plurality of studs (3) are welded to the upper surface of the upper flange, the lower surface of the lower flange and both sides of the web of the horizontal short steel section (2), and the studs (3) are evenly arranged along the length direction of the horizontal short steel section (2); The horizontal short steel (2) is embedded in the conversion concrete beam (4) and placed in the center. The distance between the horizontal short steel (2) and the top and bottom of the conversion concrete beam (4) is not less than 250 mm, and the distance between the horizontal short steel (2) and the side of the conversion concrete beam (4) is not less than 150 mm. The length of the horizontal short steel (2) extending from the side of the H-shaped steel column (7) is not less than 2 times the cross-sectional height of the H-shaped steel column (7) in the same direction. The cross-sectional height of the horizontal short steel (2) is not less than the cross-sectional height of the H-shaped steel column (7) in the same direction. The thickness of the upper and lower flanges of the horizontal short steel (2) is not less than the flange thickness of the H-shaped steel column (7). In the weak axis direction of the H-shaped steel column (7), the upper longitudinal reinforcement (10) is connected and fixed to the column flange of the H-shaped steel column (7) through a sleeve (9); in the strong axis direction of the H-shaped steel column (7), the upper longitudinal reinforcement (10) is connected and fixed to the H-shaped steel column (7) through the horizontal partition (8).

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