Concrete column corner circumscribed steel beam connecting structure and construction method thereof

Abstract

The application discloses a concrete column corner-circumscribed steel beam connecting structure and a construction method thereof, and belongs to the technical field of building engineering, which comprises a concrete column and a circumscribed steel beam. At least one column corner load transmitting element is arranged at at least one column corner of the concrete column and is fixedly connected with the circumscribed steel beam. The column corner load transmitting element comprises an outer flat limb, an embedded limb and a horizontal web. The outer flat limb is embedded in the concrete column and is flush with both sides of the column corner. The outer flat limb is provided with at least one longitudinally arranged column longitudinal reinforcement and is connected with a plurality of transversely arranged column stirrups. At least one outer side surface of the outer flat limb is orthogonally or obliquely connected with the circumscribed steel beam. At least three embedded limbs are uniformly spaced apart from the outer flat limb, are embedded in the inner side of the column stirrup and the column longitudinal reinforcement of the concrete column, and are connected with each other through a plurality of transversely arranged horizontal webs to form a hollow lattice structure. Under the condition that the bearing capacity of the connecting joint is not less than the bearing capacity of the steel beam, the connecting structure of the steel beam directly connected with the column corner of the concrete column is realized.

Description

Technical Field

[0001] This invention belongs to the field of building engineering technology, specifically relating to a connection structure for external steel beams at the corner of a concrete column and its construction method. Background Technology

[0002] In the field of building construction, there are two common connection methods between steel beams and concrete columns: embedded part connection and column-embedded steel section connection. In the embedded part connection, the steel beam is connected to the concrete column through embedded parts on the column surface, which is usually suitable for connection nodes with small beam end reactions. In the column-embedded steel section connection, the steel section is placed in the center of the concrete, and the steel beam extends into the interior of the concrete column to connect with the column-embedded steel section, which is usually suitable for connection nodes with large beam end reactions.

[0003] The load-bearing capacity of embedded parts connections is controlled by the anchor reinforcement. The load-bearing capacity of the connection node is usually less than that of the steel beam itself, making it unsuitable for situations with large bending moments or shear forces at the beam ends. Due to the relatively weak bending stiffness of embedded parts connections, their application in important connection parts such as cantilever beams is significantly limited. Furthermore, to meet the required protective layer thickness for the anchor reinforcement, the embedded parts and steel beams must be at a certain distance from the sides of the concrete column, and cannot be installed close to the column corners.

[0004] Built-in steel connection can achieve the same load-bearing capacity as steel beam, but in order to meet the requirements of steel protective layer thickness, steel beam and built-in steel need to be a certain distance away from the side of concrete (usually more than 150mm), and cannot be set at the corner of concrete column. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a connection structure for external steel beams at the corner of a concrete column and its construction method.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides a connection structure for an external steel beam at the corner of a concrete column, comprising: Concrete columns and external steel beams, At least one corner of the concrete column is embedded with a corner force transmission component that is fixedly connected to an external steel beam. The column corner force transmission component includes an outer flat limb, an inner limb, and a horizontal web member. The outer flat limb is hollow and long, embedded in the concrete column and flush with both sides of the column corner. The outer flat limb is provided with at least one longitudinal column reinforcement bar and connected to several transverse column stirrups. At least one outer side of the outer flat limb is orthogonally or obliquely connected to an external steel beam. At least three internal limbs, which are embedded in the inner side of the column stirrups and column longitudinal reinforcements of the concrete column, parallel and evenly spaced from the outer horizontal limbs, and are interconnected by several transversely arranged horizontal web members to form a central open space configuration.

[0007] Furthermore, the outer flat limb and the inner flat limb are at the same height, and are connected from top to bottom by three horizontal web members: upper, middle and lower. The height of the horizontal web member located in the middle is equal to the height of the external steel beam and is set at the same elevation position as the external steel beam.

[0008] Furthermore, the inner surface of the outer flat limb, the inner surface of the inner limb, and the upper and lower surfaces of the horizontal web member are respectively provided with a number of single or multiple rows of shear-resistant connectors, and the longitudinal spacing between the shear-resistant connectors arranged on the inner surface of the outer flat limb and the inner surface of the inner limb should be ≤150mm.

[0009] Furthermore, the interior of the hollow tube of the outer flat limb is filled with grouting material with a concrete strength grade one level higher than that of the concrete column, or the interior of the hollow tube of the outer flat limb is filled with fine stone concrete.

[0010] Furthermore, the column stirrups are connected to the outer horizontal leg through column stirrup connecting plates. The column stirrup connecting plates are connected to the column stirrups one by one, or are set along the entire height of the outer horizontal leg. When the column stirrup connecting plates are connected to the column stirrups one by one, the length of the column stirrup connecting plates is 5 times the diameter of the column stirrups. The thickness of the column stirrup connecting plate is the diameter of the column stirrup minus 2mm, and should not be less than 6mm; the width of the column stirrup connecting plate is 5 to 7 times the diameter of the column stirrup. The column stirrups and the column stirrup connecting plate are welded on both sides, and the welding length is 5 to 6 times the stirrup diameter; the column stirrup connecting plate is welded to the outer horizontal leg.

[0011] Furthermore, the horizontal web members adopt an H-shaped or C-shaped cross section; When the cross-sectional height of the horizontal web member is greater than 100mm, the column stirrups within the height of the horizontal web member shall be tie bars with transverse openings through the horizontal web member.

[0012] Furthermore, the cross-section of the outer flat limb is hollow rectangular, and the wall thickness of the cross-section is not less than the flange wall thickness of the outer steel beam; the cross-sectional width of the outer flat limb is not less than the width of the intersection surface between the flange of the outer steel beam and the outer flat limb, and the ratio of the cross-sectional wall thickness to the cross-sectional width of the outer flat limb is not greater than 0.1.

[0013] Furthermore, the built-in limb is H-shaped, and the sum of the flange width of the built-in limb and the thickness of the concrete protective layer on the outside of the built-in limb is equal to the cross-sectional width of the outer horizontal limb; the flange width of the horizontal web member is equal to the flange width of the built-in limb; the thickness of the concrete protective layer on the outside of the built-in limb is 70~100mm or not less than 150mm.

[0014] Furthermore, the lateral clearance between the outer flat limb and the inner limb is 1.5 to 3.0 times the height of the outer steel beam.

[0015] Secondly, the present invention provides a construction method for a steel beam connection structure at the corner of a concrete column as described in any of the first aspects, characterized by comprising the following steps: Step (1): Pre-assemble the steel structural members of this connection device, including the outer horizontal members, inner horizontal members, horizontal web members, and associated connecting plates, shear connectors, etc. The pre-assembled section should include the pre-connected section at the beam end of the external steel beam. The length of the pre-connected section at the beam end should preferably be equal to the beam section height; Step (2): Pre-construct the longitudinal reinforcement of the concrete column, and tie the longitudinal reinforcement of the column below the bottom elevation of this connection structure design; no column longitudinal reinforcement joints should be set within the height range of this connection device and within 500mm above and below it; close and fix the column formwork below this connection device; Step (3): Pour the column concrete to 50mm below the bottom elevation of this connection device; Step (4): Temporarily fix the prefabricated column corner force transmission component in step (1) to the column corner designed for installation; in this step, the connecting device should be inserted from top to bottom, and the 1 to 3 longitudinal bars of the column corner should pass through the hollow pipe of the outer horizontal limb according to the design structure. Step (5): Use engineering-specific grouting material to pour the installation gap reserved in step (3), and accurately adjust the verticality and planar positioning of the connecting device in this step; the two sides of the outer flat limb should be flush with the design surfaces on both sides of the column corner; Step (6): Construct the remaining stirrups of the concrete column; wherein, the column stirrups within the height range of the connecting device are constructed in accordance with the methods described in claims 5 to 6 above; after the reinforcement construction is completed, close and fix the remaining formwork of the column; Step (7): According to claim 4, pour grout or fine stone concrete into the hollow tube of the outer flat limb; this process should be fully and thoroughly vibrated to ensure that the pouring inside the hollow tube is dense; Step (8): Pour the remaining concrete for the column; cure according to standard procedures; remove the formwork; Step (9): After the column concrete strength reaches 100% of the design strength, splice the steel beam with the pre-connected section at the beam end; complete the construction.

[0016] The concrete and grouting material pouring in steps (3) to (8) above should be carried out continuously, and the pouring time of each batch should not be later than the final setting time of the previous concrete.

[0017] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: The concrete column corner external steel beam connection structure and construction method provided by this invention are applicable to the connection nodes of steel beams connected to the corners of reinforced concrete columns, and can be used in the case of bidirectional external steel beams at the corners: By setting rectangular steel pipe vertical column limbs at the column corners, a connection form in which the steel beam is directly connected to the column corners is realized. Furthermore, an equal-strength connection between the external steel beam and the column can be achieved: by forming a lattice structure within the column through vertical limbs and horizontal web members, and by controlling the dimensions of each component and the overall lattice structure, the bearing capacity of the node connection is not less than the bearing capacity of the steel beam itself. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a steel beam connection structure for the corner of a concrete column provided in an embodiment of the present invention.

[0019] Figure 2 This is an elevation view of a steel beam connection structure for an externally attached concrete column corner, provided as an embodiment of the present invention.

[0020] Figure 3 for Figure 2 Sectional view of AA.

[0021] Figure 4 This is a schematic diagram of a unidirectional arrangement of external steel beams provided in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of a bidirectional arrangement of external steel beams provided in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the arrangement of a shear-resistant connector provided in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the arrangement of a shear-resistant connector provided in an embodiment of the present invention.

[0025] In the diagram: 1. Concrete column; 2. External horizontal member; 3. Internal vertical member; 4. Horizontal web member; 5. Shear connector; 6. Stirrup connector plate; 7. Transverse opening; 8. Hollow pipe; 9. Column longitudinal reinforcement; 10. Column stirrup; 11. External steel beam. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figures 1-3 As shown, this embodiment of the invention provides a steel beam connection structure for an externally connected concrete column corner. By setting localized lattice steel sections on and inside the concrete column 1, with some longitudinal reinforcement 9 passing through the box-section steel sections, and with corresponding structural measures, an externally connected steel beam 11 is directly connected to the column corner, thereby achieving a force-transfer connection between the steel beam and the concrete column 1. Specifically, the connection structure includes: Concrete column 1 and external steel beam 11, At least one corner of the concrete column 1 is embedded with a corner force transmission component that is fixedly connected to the external steel beam 11. The column corner force transmission component includes an outer horizontal member 2, an inner horizontal member 3, and a horizontal web member 4. The outer horizontal limb 2 is hollow and long, embedded in the concrete column 1 and flush with both sides of the column corner. The outer horizontal limb 2 is provided with at least one longitudinal column reinforcement 9 and connected to several transverse column stirrups 10. At least one outer side of the outer horizontal limb 2 is orthogonally or obliquely connected to an external steel beam 11. At least three internal limbs 3 are embedded in the inner side of the column stirrups 10 and column longitudinal bars 9 of the concrete column 1, parallel and evenly spaced from the outer horizontal limbs 2, and are interconnected by several transversely arranged horizontal web members 4 to form a hollow lattice member.

[0030] In this embodiment, the external steel beam 11 is connected to the corner of the rectangular concrete column 1. The external steel beam 11 can be orthogonal to the column corner surface or oblique to the column surface at a certain angle. When the steel beam is oblique to the column corner surface, the horizontal oblique angle θ should preferably be <45°, and sufficient space must be ensured for welding at the beam end. (Reference) Figure 4 , Figure 5 The external steel beam 11 can be installed unidirectionally at the column corner or bidirectionally at the column corner. Considering the conventional component dimensions of building engineering, it is preferably applied when the external steel beam 11 has a beam height of 100~400mm and a beam width of 80~300mm. There are no special requirements for the cross-sectional shape of the external steel beam 11, and it can be any conventional steel beam cross-section, such as H-section, box section, C-section, etc.

[0031] The corner load-bearing member typically consists of one outer horizontal member 2 and three inner horizontal members 3. The outer horizontal member 2 uses a rectangular steel tube cross section to provide structural strength and stiffness at the corner; the inner horizontal members 3 use an H-shaped cross section to facilitate the pouring of column concrete.

[0032] The outer horizontal limb 2 and the inner horizontal limb 3 are at the same height, and are connected from top to bottom by three horizontal web members 4, namely upper, middle and lower. The height of the horizontal web member 4 located in the middle is the same as the height of the external steel beam 11 and is set at the same elevation position as the external steel beam 11.

[0033] The outer horizontal member 2 is positioned at the corner of the concrete column 1, with its outer surface flush with the outer surface of the concrete column 1. The outer steel beam 11 is directly connected to the outer horizontal member 2. Generally, the outer steel beam 11 is directly connected to the outer horizontal member 2 by circumferential welding.

[0034] The built-in member 3 is embedded inside the concrete column 1, located inside the longitudinal reinforcement 9. (Reference) Figure 6 , Figure 7 Depending on the actual engineering conditions, the built-in limb 3 can be placed in the shallow layer of the concrete column 1, in which case the concrete protective layer thickness should be 70~100mm; or it can be placed in the deep layer of the concrete column 1, in which case the concrete protective layer thickness should be ≥150mm. When conditions permit, placing the built-in limb 3 in the deep layer should be given priority, which is conducive to the coordinated work of the steel frame and the concrete.

[0035] The height of the outer flat limb 2 and the inner limb 3 should be hb+200mm above and below the top and bottom surfaces of the outer steel beam 11, respectively, where hb is the beam height of the outer steel beam 11.

[0036] The cross-sectional height of the horizontal web member 4 should be equal to the beam height hb of the external steel beam 11, and should be set at the same elevation as the external steel beam 11. The upper and lower horizontal web members 4 are respectively set at the top and bottom of the vertical column, and their cross-sectional height should preferably be 100~200mm.

[0037] The inner surface of the outer horizontal member 2, the inner surface of the inner horizontal member 3, and the upper and lower surfaces of the horizontal web member 4 are each provided with a number of single or multiple rows of shear connectors 5 spaced apart. The longitudinal spacing between the shear connectors 5 arranged on the inner surface of the outer horizontal member 2 and the inner surface of the inner horizontal member 3 should be ≤150mm. Generally, shear studs can be used as shear connectors 5. Shear studs can be arranged in a single row. The outer horizontal member 2, the inner horizontal member 3, the horizontal web member 4, and the shear connectors 5 together form this force transmission structure and force transmission path, and the reliability of the connection between its components should be carefully controlled.

[0038] At the corner of the column where the outer horizontal member 2 is located, depending on the actual column reinforcement, 1 to 3 longitudinal reinforcement bars 9 pass through the inside of the square steel pipe of the outer horizontal member 2. The inside of the hollow rectangular pipe of the outer horizontal member 2 is filled with a special structural grouting material with a concrete strength grade one level higher than that of the concrete column 1; under reliable construction conditions, the inside of the rectangular pipe can also be filled with fine aggregate concrete.

[0039] For reinforced concrete column 1 with corner force transmission components installed, the stirrups should be densely packed along the entire height of the floor, and the stirrup spacing should be ≤100mm.

[0040] In sections where column corner load transfer members are installed, the outer ring stirrups of the column cannot be connected in a conventional manner around the outer horizontal leg 2. At this point, the stirrups need to be connected to the column wall of the outer horizontal leg 2 via the stirrup connection plate 6 of column stirrup 10. The thickness of the stirrup connection plate 6 can be the stirrup diameter minus 2mm, but should not be less than 6mm; the width of the connection plate should be 6 times the stirrup diameter.

[0041] The column stirrup 10 is welded to the stirrup connecting plate 6 on both sides, with a welding length of 5 times the stirrup diameter. The stirrup connecting plate 6 is welded to the outer horizontal leg 2. The stirrup connecting plate 6 can be installed separately for each stirrup or along the entire height of the outer horizontal leg 2. When the stirrup connecting plate 6 is installed separately for each column stirrup 10, the length of a single stirrup connecting plate 6 should preferably be 5 times the diameter of the column stirrup 10. Preferably, the stirrup connecting plate 6 should be installed along the entire height of the outer horizontal leg 2.

[0042] When the cross-sectional height of each horizontal web member 4 is greater than 100mm, the inner ring of column stirrups 10 within the height of the horizontal web member 4 should preferably be tie bars, and the reinforcement should be threaded through the transverse openings 7 in the web of the horizontal web member 4. The holes for the web reinforcement to be threaded through should be prefabricated in the factory and should not be drilled on site.

[0043] The wall thickness of the rectangular steel tube of the outer horizontal member 2 should not be less than the flange wall thickness of the external steel beam 11. The cross-sectional width b1 of the rectangular steel tube of the outer horizontal member 2 should not be less than 200mm, and should not be less than the width of the intersection surface between the flange of the external steel beam 11 and the tube. At the same time, the ratio of the cross-sectional wall thickness to the cross-sectional width b1 of the outer horizontal member 2 should not be greater than 0.1.

[0044] If the cross-sectional wall thickness of the rectangular outer limb 2 is too large, it will make it difficult to pour the grout (or concrete) inside, and will also cause the stiffness difference between the connection section and the concrete section to be too large, which is not conducive to the reliability of the connection.

[0045] The transverse section of the internal limb 3 is H-shaped steel, and the flange width b2 should preferably be b1-a1, where a1 is the thickness of the concrete protective layer on the outside of the internal limb 3. The flange width of the horizontal web member 4 is the same as the flange width of the internal limb 3.

[0046] For concrete columns 1 using corner load transfer members, the cross-sectional dimensions should not be less than 900mm × 900mm. The net spacing between the vertically arranged outer horizontal member 2 and the inner horizontal member 3 should preferably be 1.5hb to 3.0hb, meaning the net lateral spacing between the outer horizontal member 2 and the inner horizontal member 3 is 1.5 to 3.0 times the height of the external steel beam 11.

[0047] The steel grade of the internal steel structural members of the column corner load transfer components (including the outer horizontal member 2, the inner horizontal member 3, the horizontal web member 4, and the stirrup connecting plate 6) shall not be lower than Q355B. Furthermore, it shall not be lower than the steel grade of the external steel beam 11.

[0048] The steel components of the column corner force transmission members located inside the concrete column 1 shall not be painted. The exposed steel components shall be treated with anti-corrosion and fireproofing and meet the relevant requirements of the current code for anti-corrosion and fireproofing design of steel components.

[0049] The concrete column corner external steel beam connection structure provided in this embodiment of the invention forms a lattice structure for force transmission through the vertical outer horizontal member 2 and the inner member 3 embedded inside the concrete column 1, together with the horizontal web member 4. A single outer horizontal member 2 placed on the column surface cannot reliably transmit force between the steel beam and the concrete column 1; therefore, the outer horizontal member 2, the inner member 3, and the horizontal web member 4 need to be formed into an integral lattice structure, and shear connectors 5 are provided on the surface of the steel member, thereby forming an overall force transmission mechanism that transfers the load of the connected local part to the entire cross-section of the concrete column 1. This is significantly different from the connection of general embedded parts and anchor bars. The concrete column corner external steel beam 11 connection structure provided in this embodiment of the invention can provide greater connection stiffness and has better connection bearing capacity.

[0050] The column corner longitudinal reinforcement 9 passes through the rectangular hollow steel tube of the outer horizontal limb 2 at the corner; the column stirrups 10 are fixedly connected to the outer horizontal limb 2 at other locations using stirrup connection plates 6. Since the column corner longitudinal reinforcement 9 needs to pass through the inside of the steel tube, the inside of the steel tube is filled with grout or fine aggregate concrete to ensure continuity of the column longitudinal reinforcement 9 at the connection points. The outer ring column stirrups 10 are connected to the outer horizontal limb 2 at other locations using stirrup connection plates 6, thus ensuring that the outer ring column stirrups 10 at the connection points are also closed ring stirrups.

[0051] The concrete column corner external steel beam connection structure provided in this embodiment of the invention is applicable to the connection node of the steel beam connected to the corner of the reinforced concrete column 1, and can be used for the case of bidirectional external steel beam 11 at the corner: by setting a rectangular steel pipe vertical column limb at the column corner, the connection form of the steel beam directly connected to the column corner is realized. Furthermore, it can achieve an equal-strength connection between the external steel beam 11 and the column: by forming a lattice structure inside the column through the vertical limb and horizontal web members 4, and by controlling the dimensions of each component and the overall lattice structure, the bearing capacity of the node connection is not less than the bearing capacity of the steel beam itself.

[0052] Secondly, the present invention provides a construction method for the above-described concrete column corner external steel beam connection structure, characterized by comprising the following steps: Step (1): Pre-assemble the steel structural members of this connection device, including the outer horizontal member 2, the inner horizontal member 3, the horizontal web member 4, and the associated connecting plates, shear connectors 5, etc. The pre-assembled section should include the pre-connection section at the beam end of the external steel beam 11. The length of the pre-connection section at the beam end should preferably be equal to the beam section height; Step (2): Pre-construct the longitudinal reinforcement of concrete column 1, and tie the longitudinal reinforcement 9 of the column below the bottom elevation of this connection structure design; no joints of the longitudinal reinforcement 9 of the column should be set within the height range of this connection device and within 500mm above and below it; close and fix the column formwork below this connection device. Step (3): Pour the column concrete to 50mm below the bottom elevation of this connection device; Step (4): Temporarily fix the prefabricated column corner force transmission component in step (1) to the column corner designed for installation; in this step, the connecting device should be inserted from top to bottom, and the 1 to 3 longitudinal bars of the column corner should pass through the hollow pipe 8 of the outer horizontal limb 2 according to the design structure. Step (5): Use engineering-specific grouting material to pour the installation gap reserved in step (3), and accurately adjust the verticality and planar positioning of the connecting device in this step; the two sides of the outer flat limb 2 should be flush with the design surfaces on both sides of the column corner; Step (6): Construct the remaining stirrups of the concrete column 1; wherein, the column stirrups 10 within the height range of the connecting device are constructed in accordance with the methods described in claims 5 to 6 above; after the reinforcement construction is completed, close and fix the remaining formwork of the column; Step (7): According to claim 4, pour grout or fine stone concrete into the hollow tube of the outer flat limb 2; this process should be fully and thoroughly vibrated to ensure that the pouring inside the hollow tube is dense; Step (8): Pour the remaining concrete for the column; cure according to standard procedures; remove the formwork; Step (9): After the column concrete strength reaches 100% of the design strength, splice the steel beam with the pre-connected section at the beam end; complete the construction.

[0053] The concrete and grouting material pouring in steps (3) to (8) above should be carried out continuously, and the pouring time of each batch should not be later than the final setting time of the previous concrete.

[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A steel beam connection structure for the corner of a concrete column, characterized in that, include: Concrete columns and external steel beams, At least one corner of the concrete column is embedded with a corner force transmission component that is fixedly connected to an external steel beam. The column corner force transmission component includes an outer flat limb, an inner limb, and a horizontal web member. The outer flat limb is hollow and long, embedded in the concrete column and flush with both sides of the column corner. The outer flat limb is provided with at least one longitudinal column reinforcement bar and connected to several transverse column stirrups. At least one outer side of the outer flat limb is orthogonally or obliquely connected to an external steel beam. At least three internal limbs, which are embedded in the inner side of the column stirrups and column longitudinal reinforcements of the concrete column, parallel and evenly spaced from the outer horizontal limbs, and are interconnected by several transversely arranged horizontal web members to form a central open space configuration.

2. The steel beam connection structure at the corner of a concrete column according to claim 1, characterized in that, The outer flat limb and the inner limb are at the same height, and are connected by three horizontal web members from top to bottom. The height of the horizontal web member located in the middle is equal to the height of the external steel beam and is set at the same elevation position as the external steel beam.

3. The steel beam connection structure at the corner of a concrete column according to claim 2, characterized in that, The inner surface of the outer flat limb, the inner surface of the inner limb, and the upper and lower surfaces of the horizontal web are respectively provided with a number of single or multiple rows of shear-resistant connectors, and the longitudinal spacing between the shear-resistant connectors arranged on the inner surface of the outer flat limb and the inner surface of the inner limb should be ≤150mm.

4. The steel beam connection structure at the corner of a concrete column according to claim 3, characterized in that, The interior of the hollow tube of the outer flat limb is filled with grouting material with a concrete strength grade one level higher than that of the concrete column, or the interior of the hollow tube of the outer flat limb is filled with fine stone concrete.

5. The steel beam connection structure at the corner of a concrete column according to claim 4, characterized in that, The column stirrups are connected to the outer horizontal leg through column stirrup connecting plates. The column stirrup connecting plates are connected to the column stirrups one by one, or are set along the entire height of the outer horizontal leg. When the column stirrup connecting plates are connected to the column stirrups one by one, the length of the column stirrup connecting plates is 5 times the diameter of the column stirrups. The thickness of the column stirrup connecting plate is the diameter of the column stirrup minus 2mm, and should not be less than 6mm; the width of the column stirrup connecting plate is 5 to 7 times the diameter of the column stirrup. The column stirrups and the column stirrup connecting plate are welded on both sides, and the welding length is 5 to 6 times the stirrup diameter; the column stirrup connecting plate is welded to the outer horizontal leg.

6. The steel beam connection structure at the corner of a concrete column according to claim 5, characterized in that, The horizontal web members adopt an H-shaped or C-shaped cross section; When the cross-sectional height of the horizontal web member is greater than 100mm, the column stirrups within the height of the horizontal web member shall be tie bars with transverse openings through the horizontal web member.

7. The steel beam connection structure at the corner of a concrete column according to claim 6, characterized in that, The outer flat limb has a hollow rectangular cross-section, and the wall thickness of the cross-section is not less than the flange wall thickness of the outer steel beam; the cross-sectional width of the outer flat limb is not less than the width of the intersection surface between the flange of the outer steel beam and the outer flat limb, and the ratio of the cross-sectional wall thickness to the cross-sectional width of the outer flat limb is not greater than 0.

1.

8. The steel beam connection structure at the corner of a concrete column according to claim 7, characterized in that, The built-in limb is H-shaped, and the sum of the flange width of the built-in limb and the thickness of the concrete protective layer on the outside of the built-in limb is equal to the cross-sectional width of the outer horizontal limb; the flange width of the horizontal web member is equal to the flange width of the built-in limb; the thickness of the concrete protective layer on the outside of the built-in limb is 70~100mm or not less than 150mm.

9. The steel beam connection structure at the corner of a concrete column according to claim 8, characterized in that, The lateral clearance between the outer flat limb and the inner limb is 1.5 to 3.0 times the height of the outer steel beam.

10. A construction method for a steel beam connection structure at the corner of a concrete column as described in any one of claims 6 to 9, characterized in that, Includes the following steps: Step (1): Pre-assemble the steel structural members of this connection structure, including the outer horizontal members, the inner horizontal members, the horizontal web members and the associated connecting plates and shear connectors; the pre-assembled section should include the pre-connected section at the beam end of the external steel beam; the length of the pre-connected section at the beam end is equal to the height of the beam section; Step (2): Pre-construct the longitudinal reinforcement of the concrete column, and tie the longitudinal reinforcement of the column below the bottom elevation of this connection structure design; no column longitudinal reinforcement joints should be set within the height range of this connection structure and within 500mm above and below it; close and fix the column formwork below this connection structure. Step (3): Pour the column concrete to 50mm below the bottom elevation of this connection structure; Step (4): Temporarily fix the prefabricated column corner force transmission component in step (1) to the column corner designed for installation; in this step, the connection structure should be inserted from top to bottom, and the 1 to 3 longitudinal bars of the column corner should pass through the hollow pipe of the outer horizontal limb according to the design structure. Step (5): Use engineering-specific grouting material to pour the installation gap reserved in step (3), and accurately adjust the verticality and planar positioning of the connection structure in this step; the two sides of the outer flat limb should be flush with the design surfaces on both sides of the column corner; Step (6): Construct the remaining stirrups of the concrete column; wherein, the column stirrups are constructed within the connection structural height range; after the reinforcement construction is completed, the remaining formwork of the column is closed and fixed; Step (7): Pour grout or fine stone concrete into the hollow tube of the outer flat limb; this process should be fully and thoroughly vibrated to ensure that the pouring inside the hollow tube is dense; Step (8): Pour the remaining concrete for the column; cure according to standard procedures; remove the formwork; Step (9): After the column concrete strength reaches 100% of the design strength, splice the steel beam with the pre-connected section at the beam end; complete the construction.

Images