Square steel tube confined concrete column-RC beam connecting joint and construction method

Abstract

The invention belongs to the technical field of building structural member connection, and discloses a square steel tube confined concrete column-RC beam connection joint which comprises a connection joint body used for connecting a steel tube confined concrete column and a reinforced concrete beam. The connecting joint comprises a joint area steel pipe, and the reinforced concrete beam penetrates through the joint area steel pipe and is fixedly connected with the joint area steel pipe. The steel pipe confined concrete column comprises an upper column and a lower column; a connecting assembly is arranged in the reinforced concrete beam, penetrates through the joint area steel pipe and is fixedly connected with the joint area steel pipe. The node area steel pipe is filled with concrete. The method is convenient and fast to construct, reliable in joint performance, high in material utilization rate, small in steel consumption and excellent in anti-seismic performance, local buckling of the square steel pipe can be effectively delayed, the integrity of concrete is higher, the restraining effect on core concrete is enhanced, economic benefits are improved, and the problems that in the prior art, construction is difficult, and joints are complex are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure component connection, and in particular relates to a square steel tube confined concrete column-RC beam connection node and a construction method. Background Art

[0002] In existing building construction, the connection between square steel tube confined concrete columns and reinforced concrete beams is a commonly used structural form, which is suitable for engineering fields such as high-rise buildings and bridges, and can meet the structural connection requirements under complex stress conditions.

[0003] However, when square steel tubes are used to confine concrete columns, the confinement of the core concrete is uneven, and the steel tubes are prone to local buckling. The node connection between square steel tube confined concrete columns and reinforced concrete beams is a key issue in the design of steel tube confined concrete structures. The effectiveness of the connection nodes directly affects the stiffness, stability and bearing capacity of the overall structure, and also affects the difficulty and progress of on-site construction. The existing steel tube confined concrete node area has the problem of dense steel bars in the node area and the difficulty of the longitudinal bars of the beams to penetrate the node area, which directly increases the difficulty of construction and affects the progress of on-site construction.

[0004] Therefore, it is necessary to design a square steel tube confined concrete column-RC beam connection node and construction method to solve the above technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a square steel tube confined concrete column-RC beam connection node.

[0006] To achieve the above-mentioned object, the present invention provides a square steel tube confined concrete column-RC beam connection node, including a connection node for connecting a steel tube confined concrete column and a reinforced concrete beam;

[0007] The connection node comprises a node area steel pipe, the node area steel pipe is arranged on the steel pipe confined concrete column, and the reinforced concrete beam passes through the node area steel pipe and is fixedly connected to the node area steel pipe;

[0008] The steel tube confined concrete column comprises an upper column and a lower column which are arranged correspondingly, wherein the upper column is arranged above the steel tube in the node area, and the lower column is arranged below the steel tube in the node area;

[0009] A connection component is provided in the reinforced concrete beam, and the connection component passes through the node area steel pipe and is fixedly connected to the node area steel pipe;

[0010] The steel pipe in the node area is filled with concrete.

[0011] Preferably, the upper column comprises an upper column steel pipe, the bottom end of the upper column steel pipe is arranged corresponding to the upper end of the node area steel pipe and a gap is provided therebetween, and the concrete in the node area steel pipe is combined with the concrete in the upper column steel pipe.

[0012] Preferably, the lower column comprises a lower column steel pipe, the top end of the lower column steel pipe is arranged corresponding to the lower end of the node area steel pipe and a gap is provided, and the concrete in the node area steel pipe is combined with the concrete in the lower column steel pipe.

[0013] Preferably, an upper structural joint is provided between the upper column steel pipe and the node area steel pipe, and a lower structural joint is provided between the lower column steel pipe and the node area steel pipe.

[0014] Preferably, the connection assembly includes a shear web vertically penetrating the node area steel pipe, and the shear web is welded and fixed to the node area steel pipe; both ends of the shear web extend out of the node area steel pipe and are embedded in the reinforced concrete beam.

[0015] Preferably, flanges are vertically fixed to the upper and lower sides of the shear web extending out of the steel pipe portion of the node area, one end of the flange abuts and is fixed to the side wall of the steel pipe in the node area, and the other end of the flange is flush with the end of the shear web and embedded in the reinforced concrete beam.

[0016] Preferably, the node area steel pipe and the side wall opposite to the reinforced concrete beam are respectively provided with a second hole, the upper and lower sides of the second hole are respectively provided with a first hole vertically connected to the second hole, the shear web passes through the second hole, the flange is flush with the lower end of the first hole, and the edge of the reinforced concrete beam is flush with the edge of the first hole away from the second hole.

[0017] Preferably, a plurality of inclined ribs are longitudinally arranged at the four corners of the steel pipe in the node area, two sides of the inclined ribs are respectively fixedly connected to adjacent sides of the steel pipe in the node area, and grouting through holes are opened through the inclined ribs.

[0018] Preferably, an outer steel plate adapted to the shear web is welded and fixed to the side wall of the steel pipe in the node area, and the two outer steel plates are arranged parallel to the shear web.

[0019] The present invention also discloses a square steel tube confined concrete column-RC beam connection node construction method, comprising the following steps:

[0020] Cut materials for upper columns, lower columns and steel pipes in node areas, and cut materials for other auxiliary structures at the same time;

[0021] According to the specifications of the connection components, through holes corresponding to the connection components are opened on the side wall of the steel pipe in the node area, and the connection components are welded to the steel pipe in the node area;

[0022] Tie the reinforcement bars of concrete columns, upper columns and lower columns;

[0023] The upper column material and the lower column material are welded to the upper and lower ends of the steel pipe in the node area, and then the reinforcing ribs are arranged at the corresponding positions to form a frame structure;

[0024] Concrete is poured to form concrete beams, and then the upper columns, steel pipes in the node area and lower columns are poured to form structural concrete.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a square steel tube constrained concrete column-RC beam connection node and a construction scheme, which is used to connect the steel tube constrained concrete column and the reinforced concrete beam, strengthens the effective constraint of the core area node steel tube on the internal concrete, improves the node strength, has a high material utilization rate, low steel consumption, and convenient construction; a connection component connected to the concrete column is arranged through the middle of the steel tube in the node area, which improves the problem that the core part in the middle of the node is easy to be damaged, enhances the structural stability, improves the stiffness of the steel tube constrained concrete node, enhances the node integrity, has excellent seismic performance, and improves the shear resistance and axial compression bearing capacity, thereby achieving the purpose of "strong node and weak component"; the connection component penetrates both ends of the steel tube in the node area and is embedded in the concrete column, which can not only effectively cause the plastic hinge in the node area to occur on the reinforced concrete beam and move outward to both ends of the beam, thereby achieving the purpose of "strong column and weak beam", but also helps to strengthen the connection between the steel tube node area and the steel The bonding strength of the reinforced concrete beam connection interface is improved, the voids and relative slippage of the steel and concrete interface are reduced, and it is beneficial to the shear force transmission of the beam, and the shear bearing capacity of the node is improved; the perforated diagonal ribs arranged in the corners around the steel pipe in the node area can effectively delay the local buckling of the square steel pipe; the perforated diagonal ribs not only constrain the steel pipe and concrete, but also bear the axial load together; compared with other stiffening rib square steel pipe constrained concrete columns, the diagonal rib square steel pipe constrained concrete columns have higher strength, ductility and energy dissipation capacity at the same stiffness ratio; the perforated diagonal ribs are conducive to concrete pouring and tamping, making the concrete more integrated; the middle part of the steel pipe in the node area is a "weak area", and two outer steel plates are arranged on the outside of the steel pipe in the node area to connect with the steel pipe in the node area to improve the strength of the steel pipe structure in the "weak area", and the stiffness of the middle part of the steel pipe in the node area is increased, which not only effectively alleviates the local buckling of the steel pipe, but also avoids the presence of a relatively large stress concentration area in the steel pipe in the node area, so that the structure can better perform its performance.

[0026] The invention has the advantages of convenient construction, reliable node performance, high material utilization rate, low steel consumption, and excellent seismic performance. It can effectively delay the local buckling of the square steel tube, make the integrity of the concrete stronger, enhance the restraint effect on the core concrete, improve economic benefits, and solve the problems of difficult construction and complex nodes in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the beam-column node structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the steel structure of the beam-column node of the present invention;

[0030] Figure 3 This is a schematic diagram of the steel pipe structure in the node area of ​​the present invention;

[0031] Figure 4 It is a cross-sectional view of the steel pipe structure in the node area of ​​the present invention;

[0032] Figure 5 This is a schematic diagram of a steel pipe in a node area of ​​the present invention;

[0033] Figure 6 It is a schematic diagram of the shear web and flange of the present invention;

[0034] Figure 7 This is a schematic diagram of the perforated inclined rib of the present invention;

[0035] Figure 8 This is a schematic diagram of the outer steel plate of the present invention;

[0036] Fig. 9 It is the stress cloud diagram section of the steel structure in the node area of ​​the new type of node under the yield state;

[0037] Fig.10 It is the front view of the stress cloud diagram of the steel pipe in the node area when the node is damaged;

[0038] Fig.11 It is a top view of the stress cloud diagram of the steel pipe in the node area when the node is damaged;

[0039] Fig.12 This is the front view of the stress cloud diagram of part of the steel structure in the node area when the new node is destroyed;

[0040] Fig.13 It is a top view of the stress cloud diagram of part of the steel structure in the node area when the new type of node is destroyed;

[0041] Fig.14 Finite element simulation cloud diagram of the concrete failure mode of the standard node;

[0042] Fig.15 This is the finite element simulation cloud diagram of equivalent plastic strain of concrete in standard nodes;

[0043] Fig.16 This is the finite element simulation cloud diagram of the new type of node concrete failure mode;

[0044] Fig.17 This is the finite element simulation cloud diagram of the equivalent plastic strain of concrete in the new node.

[0045] In the figure: 1. upper column steel pipe; 2. node area steel pipe; 3. outer steel plate; 4. lower column steel pipe; 5. concrete beam; 7. flange; 8. shear web; 10. diagonal rib; 11. grouting hole; 12. first hole; 13. second hole; 61. upper structural joint; 62. lower structural joint; 91. beam longitudinal reinforcement; 92. beam stirrups. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Reference Figure 1-Figure 17 As shown, this embodiment provides a square steel tube confined concrete column-RC beam connection node, including a connection node for connecting a steel tube confined concrete column and a reinforced concrete beam 5;

[0049] The connection node includes a node area steel pipe 2, the node area steel pipe 2 is arranged on a steel pipe confined concrete column, and a reinforced concrete beam 5 passes through the node area steel pipe 2 and is fixedly connected to the node area steel pipe 2;

[0050] The steel tube confined concrete column includes an upper column and a lower column which are arranged correspondingly, wherein the upper column is arranged above the steel tube 2 in the node area, and the lower column is arranged below the steel tube 2 in the node area;

[0051] A connection assembly is provided in the reinforced concrete beam 5, and the connection assembly passes through the node area steel pipe 2 and is fixedly connected to the node area steel pipe 2;

[0052] The node area steel pipe 2 is filled with concrete.

[0053] The invention discloses a square steel tube constrained concrete column-RC beam connection node, which is used to connect the steel tube constrained concrete column and the reinforced concrete beam 5, strengthens the effective constraint of the core area node steel tube on the internal concrete, improves the node strength, has high material utilization rate, low steel consumption and convenient construction; a connection component connected to the concrete column is arranged through the middle of the node area steel tube 2, improves the problem that the core part in the middle of the node is easy to be damaged, enhances the structural stability, improves the rigidity of the steel tube constrained concrete node, makes the node integrity enhanced, has excellent seismic performance, improves the shear resistance and axial compression bearing capacity, and achieves the purpose of "strong node and weak component"; the connection component penetrates the two ends of the node area steel tube 2 and is embedded in the concrete column, which can not only effectively make the node area plastic hinge occur on the reinforced concrete beam and move outward to the two ends of the beam, so as to achieve the purpose of "strong column and weak beam", but also helps to enhance the bonding strength of the connection interface between the steel tube node area and the reinforced concrete beam, reduce the voiding and relative slippage of the steel and concrete interface, and is conducive to the shear force transmission of the beam, and improves the shear bearing capacity of the node. The invention has the advantages of convenient construction, reliable node performance, high material utilization rate, low steel consumption, and excellent seismic performance. It can effectively delay the local buckling of the square steel tube, make the integrity of the concrete stronger, enhance the restraint effect on the core concrete, improve economic benefits, and solve the problems of difficult construction and complex nodes in the prior art.

[0054] Further optimization scheme, the upper column includes an upper column steel pipe 1, the bottom end of the upper column steel pipe 1 is correspondingly arranged with the upper end of the node area steel pipe 2 and a gap is provided, and the concrete in the node area steel pipe 2 is combined with the concrete in the upper column steel pipe 1; the lower column includes a lower column steel pipe 4, the top end of the lower column steel pipe 4 is correspondingly arranged with the lower end of the node area steel pipe 2 and a gap is provided, and the concrete in the node area steel pipe 2 is combined with the concrete in the lower column steel pipe 4. The upper column steel pipe 1 and the lower column steel pipe 4 are respectively welded to the two ends of the node area steel pipe 2, and are successively fixed by hoisting positioning to form a steel pipe constrained concrete column structure to improve strength.

[0055] In one embodiment of the present application, a structural seam of 10-20 mm is provided between the bottom end of the upper column steel pipe 1 and the top end of the node area steel pipe 2, which are positioned and fixed in sequence by hoisting.

[0056] In one embodiment of the present application, a structural gap of 10-20 mm is provided between the bottom end of the lower column steel pipe 4 and the top end of the node area steel pipe 2, which are positioned and fixed in sequence by hoisting.

[0057] Further optimization scheme, an upper structural seam 61 is provided between the upper column steel pipe 1 and the node area steel pipe 2, and a lower structural seam 62 is provided between the lower column steel pipe 4 and the node area steel pipe 2. An upper structural seam 61 is provided between the upper column steel pipe 1 and the bottom and top of the node area steel pipe 2, which is convenient for positioning and fixing by hoisting; a lower structural seam 62 is provided between the lower column steel pipe 4 and the bottom end of the node area steel pipe 2, which is convenient for positioning and fixing by hoisting.

[0058] In one embodiment of the present application, the upper column steel pipe 1, the lower column steel pipe 4 and the node area steel pipe 2 are all made by curling and welding of rectangular steel plates or by cutting of seamless rectangular steel pipes.

[0059] In one embodiment of the present application, column longitudinal reinforcement and column stirrups are provided in the steel tube confined concrete column to improve the strength.

[0060] In one embodiment of the present application, the reinforced concrete beam 5 is provided with beam longitudinal reinforcement 91 and beam stirrups 92, and full-length longitudinal reinforcements and stirrups are arranged at both ends of the beam column.

[0061] In one embodiment of the present application, the upper structural seam 61 and the lower structural seam 62 are designed to be in the range of 10-20 mm.

[0062] Further optimization scheme, the connection assembly includes a shear web 8 vertically penetrating the node area steel pipe 2, and the shear web 8 is welded and fixed to the node area steel pipe 2; the two ends of the shear web 8 extend out of the node area steel pipe 2 and are embedded in the reinforced concrete beam 5. The shear web 8 is set on the node area steel pipe 2 and welded and fixed, so that the shear web 8 and the node area steel pipe 2 form an integral structure, improve the problem of easy damage to the core part in the middle after pouring concrete, enhance the structural stability, and improve the rigidity of the steel pipe constrained concrete node; at the same time, the two ends of the shear web 8 extend into the reinforced concrete beams 5 on both sides, so that the reinforced concrete beams 5 and the node area steel pipe 2 form a whole, and improve the overall structural strength.

[0063] Further optimization scheme, the upper and lower sides of the shear web 8 extending out of the node area steel pipe 2 are respectively vertically fixed with flanges 7, one end of the flange 7 is abutted and fixed with the side wall of the node area steel pipe 2, and the other end of the flange 7 is flush with the end of the shear web 8 and embedded in the reinforced concrete beam 5. In this embodiment, a total of four flanges 7 are designed, which are respectively arranged at the upper and lower ends of the part of the shear web 8 extending out of the node area steel pipe 2, and are vertically welded; one end of the flange 7 is aligned with the end of the shear web 8, and the other end is abutted on the node area steel plate and fixed by welding; the flange 7 and the shear web 8 form an I-shaped shear structure, while improving the integrity of the flange 7 and the shear web 8 and the node area steel pipe 2, improving the connection strength of the reinforced concrete beam 5 and the node area steel pipe 2, reducing the void and relative slip of the steel and concrete interface, and is conducive to the shear force transmission of the beam, and improving the shear bearing capacity of the node.

[0064] Further optimization scheme, the side wall opposite to the steel pipe 2 in the node area and the reinforced concrete beam 5 is respectively provided with a second hole 13, and the upper and lower sides of the second hole 13 are respectively provided with a first hole 12 vertically connected to the second hole 13, the shear web 8 passes through the second hole 13, the flange 7 is flush with the lower end of the first hole 12, and the edge of the reinforced concrete beam 5 is flush with the edge of the first hole 12 away from the second hole 13. The second hole 13 is set as a longitudinal gap, the shear web 8 passes through the second hole 13 and is welded with the steel pipe 2 in the node area to form a whole; while the first hole 12 is a rectangular structure, which is respectively set on the upper and lower sides of the second hole 13, and the flange 7 contacts and welds with the edge of one side of the first hole 12 close to the second hole 13 to form a whole; at the same time, it is convenient for the steel bars of the concrete member to pass through, so that the steel bars inside the reinforced concrete beam 5 on both sides of the steel pipe 2 in the node area pass through as a whole, thereby improving the overall strength of the reinforced concrete beam 5.

[0065] According to a further optimization scheme, a plurality of diagonal ribs 10 are longitudinally arranged at the four corners of the steel pipe 2 in the node area, and two sides of the diagonal ribs 10 are respectively fixedly connected to adjacent sides of the steel pipe 2 in the node area, and grouting through holes 11 are opened through the diagonal ribs 10. The setting height of the diagonal rib 10 is from the upper and lower ends of the steel pipe to the openings on both sides of the steel pipe. The diagonal rib 10 is welded to the steel pipe 2 in the node area, and the diagonal rib 10 and the adjacent two sides of the right angle of the square steel pipe form a hollow triangular prism; the arrangement of the diagonal rib 10 in the corners around the steel pipe 2 in the node area can effectively delay the local buckling of the square steel pipe; the diagonal rib 10 not only constrains the steel pipe and concrete, but also jointly bears the axial load; compared with other stiffening rib square steel pipe constrained concrete columns, the diagonal rib 10 square steel pipe constrained concrete column has higher strength, ductility and energy dissipation capacity at the same stiffness ratio; the openings of the diagonal rib 10 are conducive to concrete pouring and tamping, making the concrete more integrated; the diagonal rib 10 is provided with grouting holes 11 for convenient grouting.

[0066] In one embodiment of the present application, the diagonal rib 10 is a vertically arranged plate-like structure, on which a circular grouting through hole 11 is opened, and the size of the opening can be 1 / 3-1 / 2 of the width of the diagonal rib 10 .

[0067] To further optimize the solution, the side wall of the steel pipe 2 in the node area is welded and fixed with an outer steel plate 3 that matches the shear web 8, and the two outer steel plates 3 are arranged in parallel with the shear web 8. The middle part of the steel pipe 2 in the node area is a "weak area", and two outer steel plates 3 are arranged on the outside of the steel pipe 2 in the node area to connect with the steel pipe 2 in the node area, so as to improve the strength of the steel pipe structure in the "weak area", increase the stiffness of the middle part of the steel pipe 2 in the node area, effectively alleviate the local buckling of the steel pipe, and avoid the presence of a relatively large stress concentration area in the steel pipe 2 in the node area, so that the structure can better perform its performance.

[0068] In one embodiment of the present application, the outer steel plate 3 is rectangular and is arranged on both sides of the steel pipe between the two openings in the node area. The height is consistent with the arranged through web plate, the width is consistent with the side length of the steel pipe, and is connected to the node area steel pipe 2 by welding.

[0069] The shear web 8, flange 7, outer steel plate 3 and diagonal rib 10 arranged in the present application are simple in structure. Compared with the existing ring beam type nodes, external ring plate type nodes and built-in steel type nodes, there is no problem of difficult reinforcement construction in the node area. The installation method reduces the difficulty and complexity of on-site construction, has high material utilization rate, low steel consumption, good economy, beautiful appearance, and improved construction efficiency. The new square steel tube confined concrete column-reinforced concrete beam node of the present application has good mechanical properties, better solves the problem of complex construction of the traditional steel tube confined concrete column and reinforced concrete beam connection node, improves the seismic performance of the composite column, and reduces the cost of the composite column.

[0070] Through finite element simulation analysis of new nodes and standard nodes, Fig. 9 The shear web 8 penetrating the steel pipe 2 in the new node area almost completely yields. The shear web 8 effectively transfers the beam end bending moment and shear force outside the node area, plays a certain role in resisting the shear force in the core area inside the column, and improves the shear performance of the node area structure. Fig.10 When the node is damaged in the standard, there is a large stress concentration area in the node area steel pipe 2, and Fig.11 The steel tube in the node area of ​​the standard node has obvious buckling phenomenon. Compared with the standard node, Fig.12 The new type of nodes only differs in the node area structure, and everything else is the same. Fig.13 The new node effectively limits the buckling of the steel pipe 2 in the node area by adding the diagonal rib 10 to constrain the steel pipe. The diagonal rib 10 partially yields and bears part of the axial force, resulting in high stress. The new node increases the strength of the "weak area" by arranging the outer steel plate 3 outside the steel pipe 2 in the node area, avoiding the occurrence of a large stress concentration area in the node area, and giving full play to the mechanical properties of the steel pipe 2 in the node area.

[0071] Fig.14 The finite element results of concrete failure in the standard node are as follows. The concrete failure in the standard node mainly occurs in the core area of ​​the node and on both sides of the beam near the core area. Fig.15 Plastic hinges in the standard nodes appear on both sides of the beam near the core area. Fig.16 and Fig.17 The concrete failure and plastic hinge of the new type of node mainly occur on the beam, reflecting the characteristics of "strong column and weak beam". The position of the concrete plastic hinge is close to the two ends of the shear web 8 and the flange 7. Fig. 9The two ends of the extended part that penetrates the shear web 8 and the flange 7 and extends into the reinforced concrete beam 5 yield. The node area formed by the column body and the reinforced concrete beam 5 that penetrates the shear web 8 and the flange 7 has a large stiffness, and the concrete plastic area moves outward. The reinforced concrete beam 5 that does not penetrate the shear web 8 and the flange 7 has a small stiffness, which is quite different from the stiffness of the two end areas, resulting in a large shear force during the load bearing process, and the two ends of the extended part yield.

[0072] The present invention also discloses a square steel tube confined concrete column-RC beam connection node construction method, comprising the following steps:

[0073] Cut the materials for the upper column, lower column and node area steel pipe 2, and cut other auxiliary structures at the same time;

[0074] A through hole corresponding to the connection assembly is opened on the side wall of the node area steel pipe 2, and the connection assembly is welded to the node area steel pipe 2;

[0075] Tie the reinforcement bars of concrete columns, upper columns and lower columns;

[0076] The upper column material and the lower column material are welded to the upper and lower ends of the steel pipe 2 in the node area, and then the reinforcing ribs are arranged to the corresponding positions to form a frame structure;

[0077] Concrete is poured to form a concrete beam 5, and then the upper column, the node area steel pipe 2 and the lower column are poured to form a structural internal concrete.

[0078] The upper column steel pipe 1, the node area steel pipe 2 and the lower column steel pipe 4 are processed according to the design requirements. The upper column steel pipe 1, the lower column steel pipe 4 and the node area steel pipe 2 are all made by curling and welding of rectangular steel plates or by cutting of seamless rectangular steel pipes.

[0079] Two groups of first holes 12 of equal size are opened on the two side walls of the steel pipe 2 in the node area to facilitate the passage of a number of longitudinal beam reinforcements 91; a vertical second hole 13 is opened between the first holes 12 for the penetrating shear web 8 to pass through, and the two sides of the shear web 8 are welded to the inner surface of the steel plate where the second holes 13 are opened, and then the four flanges 7 are welded to the two ends of the shear web 8 and welded to the outer surface of the steel pipe 2 in the node area.

[0080] The eight inclined ribs 10 are respectively arranged at the four inner corners of the upper and lower ends of the node area steel pipe 2. The setting height of the inclined ribs 10 is from the upper and lower ends of the node area steel pipe 2 to the openings on both sides. The inclined ribs 10 are welded to the node area steel pipe 2, and the two adjacent sides of the inclined ribs 10 at right angles to the square steel pipe form a hollow triangular prism; the distance from the welding point between the inclined ribs 10 and the inner surface of the node area steel pipe 2 and the corner of the node area steel pipe 2 can be 1 / 4-1 / 3 of the side length of the node area steel pipe 2, the size of the grouting through hole 11 on the cross section of the inclined rib 10 can be 1 / 3-1 / 2 of the width of the inclined rib 10, and the adjacent distance of the grouting through holes 11 is greater than 1 / 2 of the width of the inclined rib 10.

[0081] Finally, two outer steel plates 3 are arranged on both sides of the steel pipe between the two openings in the node area, with the height consistent with the arranged shear web 8, so that the node area steel pipe 2, the diagonal rib 10, the outer steel plate 3, the penetrating shear web 8 and the flange 7 together constitute a node steel pipe complex.

[0082] Insert several column longitudinal reinforcements into the node steel pipe complex, tie the column longitudinal reinforcements and column stirrups to form a column reinforcement cage; position and fix the lower column steel pipe 4, the node steel pipe complex and the upper column steel pipe 1 from bottom to top in sequence by hoisting. The lower column steel pipe 4, the node steel pipe complex and the upper column steel pipe 1 are not tightly connected, leaving a 10mm-20mm steel pipe structural seam in the middle.

[0083] A number of beam longitudinal reinforcements 91 are passed through the holes opened on the steel pipe 2 in the node area, and the beam longitudinal reinforcements 91 and beam stirrups 92 are tied together to form a beam reinforcement cage.

[0084] Beam concrete is poured in the beam reinforcement cage, and column concrete is poured inside the upper column steel pipe 1 , the node steel pipe complex and the lower column steel pipe 4 .

[0085] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0086] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A square steel tube confined concrete column-RC beam connection node, characterized in that: It includes a connection node for connecting a steel tube confined concrete column and a reinforced concrete beam (5); The connection node comprises a node area steel pipe (2), the node area steel pipe (2) is arranged on the steel pipe confined concrete column, and the reinforced concrete beam (5) passes through the node area steel pipe (2) and is fixedly connected to the node area steel pipe (2); The steel tube confined concrete column comprises an upper column and a lower column which are arranged correspondingly, wherein the upper column is arranged above the steel tube (2) in the node area, and the lower column is arranged below the steel tube (2) in the node area; A connection component is provided in the reinforced concrete beam (5), and the connection component passes through the node area steel pipe (2) and is fixedly connected to the node area steel pipe (2); The node area steel pipe (2) is filled with concrete.

2. The square steel tube confined concrete column-RC beam connection node according to claim 1 is characterized in that: The upper column comprises an upper column steel pipe (1), the bottom end of the upper column steel pipe (1) is arranged corresponding to the upper end of the node area steel pipe (2) and a gap is provided therebetween, and the concrete in the node area steel pipe (2) is combined with the concrete in the upper column steel pipe (1).

3. The square steel tube confined concrete column-RC beam connection node according to claim 2 is characterized in that: The lower column comprises a lower column steel pipe (4), the top end of the lower column steel pipe (4) is arranged corresponding to the lower end of the node area steel pipe (2) and a gap is provided therebetween, and the concrete in the node area steel pipe (2) is combined with the concrete in the lower column steel pipe (4).

4. The square steel tube confined concrete column-RC beam connection node according to claim 3 is characterized in that: An upper structural joint (61) is provided between the upper column steel pipe (1) and the node area steel pipe (2), and a lower structural joint (62) is provided between the lower column steel pipe (4) and the node area steel pipe (2).

5. The square steel tube confined concrete column-RC beam connection node according to claim 1, characterized in that: The connection assembly comprises a shear web (8) vertically penetrating the node area steel pipe (2), the shear web (8) being welded and fixed to the node area steel pipe (2); both ends of the shear web (8) extending out of the node area steel pipe (2) and embedded in the reinforced concrete beam (5).

6. The square steel tube confined concrete column-RC beam connection node according to claim 5, characterized in that: The upper and lower sides of the shear web (8) extending out of the node area steel pipe (2) are respectively vertically fixed with flanges (7), one end of the flange (7) is abutted against and fixed to the side wall of the node area steel pipe (2), and the other end of the flange (7) is flush with the end of the shear web (8) and embedded in the reinforced concrete beam (5).

7. The square steel tube confined concrete column-RC beam connection node according to claim 6, characterized in that: The node area steel pipe (2) is provided with a second hole (13) on the side wall opposite to the reinforced concrete beam (5); the upper and lower sides of the second hole (13) are provided with a first hole (12) vertically connected to the second hole (13); the shear web (8) passes through the second hole (13); the flange (7) is flush with the lower end of the first hole (12); and the edge of the reinforced concrete beam (5) is flush with the edge of the first hole (12) away from the second hole (13).

8. The square steel tube confined concrete column-RC beam connection node according to claim 7, characterized in that: A plurality of inclined ribs (10) are longitudinally arranged at the four corners of the node area steel pipe (2), and the two sides of the inclined ribs (10) are respectively fixedly connected to the adjacent sides of the node area steel pipe (2), and grouting holes (11) are penetrated through the inclined ribs (10).

9. The square steel tube confined concrete column-RC beam connection node according to claim 5, characterized in that: The side walls of the node area steel pipe (2) are welded and fixed with outer steel plates (3) adapted to the shear web (8), and the two outer steel plates (3) are arranged parallel to the shear web (8).

10. A method for constructing a connection node between a steel tube concrete column and a reinforced concrete beam, according to the connection node between a steel tube concrete column and a reinforced concrete beam according to any one of claims 1 to 9, characterized in that The following steps are involved: Cutting materials for upper columns, lower columns and steel pipes (2) in the node area, and cutting materials for other auxiliary structures at the same time; A through hole corresponding to the connection component is opened on the side wall of the node area steel pipe (2), and the connection component is welded to the node area steel pipe (2); Tie the reinforcement bars of concrete columns, upper columns and lower columns; Welding the upper column material and the lower column material to the upper and lower ends of the node area steel pipe (2), and then arranging the reinforcing ribs at corresponding positions to form a frame structure; Concrete is poured to form a concrete beam (5), and then the upper column, the node area steel pipe (2) and the lower column are poured to form a structural cast concrete.

Images