Composite concrete filled steel tubular column-double web steel beam assembly type outer ring plate connecting joint

Abstract

The invention discloses a composite concrete filled steel tubular column-double web steel beam assembly type outer ring plate connecting joint which comprises a composite concrete filled steel tubular column, a double web steel beam, a prestress steel strand coil, an anchorage device, a first assembly type ring plate assembly, a fixed support and a second assembly type ring plate assembly. The first assembly type annular plate assembly is arranged on the outer side of the composite concrete filled steel tubular column in the circumferential direction and is formed by splicing two identical first assembly type semi-annular plate assemblies. Each first assembly type semi-ring plate assembly comprises a semi-square annular channel steel, a polygonal semi-square annular plate, a cantilever web plate, a stiffening rib, a dovetail groove and a semi-square annular groove; the second assembly type annular plate assembly is formed by splicing two identical second assembly type semi-annular plate assemblies; each second assembly type semi-ring plate assembly comprises a rectangular semi-square ring plate, a vertical connecting plate and a sawtooth groove. Assembled connection of the double-web steel beam with higher rigidity and strength and the compound concrete-filled steel tubular column can be realized, and the strength matching of the frame structure is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure engineering, and in particular is a composite steel tube concrete column-double web steel beam assembled outer ring plate connection node. Background Art

[0002] Steel tube concrete composite structure is an important structural form under the current structural system. Compared with traditional reinforced concrete structure, the steel tube in steel tube concrete can serve as a template, thereby improving construction efficiency and shortening construction period. It has been widely used in large-span factory buildings, bridges, high-rise and super-high-rise structures. The compound steel tube concrete structure is developed on the basis of the traditional single steel tube concrete structure. Its cross-sectional forms include outer square inner square, outer square inner circle, outer circle inner circle, etc. The compound steel tube concrete can make full use of the performance of steel tube confined concrete, and has the characteristics of high bearing capacity, good plasticity, and excellent fire and collapse resistance.

[0003] Ring plate nodes are a common node form in current steel tube concrete structures, including inner ring plate nodes, outer ring plate nodes, and through ring plate nodes. The connection form of steel tube concrete ring plate node structures is generally bolt-welded. The steel tube column is usually welded with the outer ring plate and web connection plate during factory prefabrication. After prefabrication, it will be connected to the steel beam on site by bolting or welding. However, since the outer ring plate is easily squeezed and deformed or otherwise damaged during transportation, the workload on site is increased and the welding quality on the construction site cannot be guaranteed.

[0004] Double-web steel beam is a steel component with great application prospects. It is a steel beam with an additional web on the basis of ordinary H steel beam, which can enhance the torsion resistance of steel beam and improve the bending and shear bearing capacity of steel beam. Compared with steel box beams with similar structures, double-web steel beams are more convenient to connect and simpler to prefabricate in factories. Since the compound steel tube concrete outer ring plate node has excellent bearing capacity, the application of ordinary H steel beams can guarantee the seismic design requirements of "strong column and weak beam", but cannot give full play to the seismic performance of the compound steel tube concrete outer ring plate node. Therefore, matching the double-web steel beam with better bending resistance with the compound steel tube concrete outer ring plate node is an important research direction. Summary of the invention

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a composite steel tube concrete column-double web steel beam assembled outer ring plate connection node.

[0006] The technical solution of the present invention to solve the technical problem is to provide a composite steel tube concrete column-double web steel beam assembled outer ring plate connection node, characterized in that the connection node includes a composite steel tube concrete column, a double web steel beam, a prestressed steel strand coil, an anchor, a first assembled ring plate assembly, a fixed support and a second assembled ring plate assembly; The first assembled ring plate assembly is arranged on the outer side of the composite steel tube concrete column along the circumferential direction, and is formed by splicing two identical first assembled half ring plate assemblies; each first assembled half ring plate assembly includes a half square annular channel steel, a polygonal half square annular plate, a cantilever web, a stiffening rib, a dovetail groove and a half square annular groove; The semi-square annular channel steel is vertically fixed to the outer side of the composite steel tube concrete column by one-way high-strength bolts; two polygonal semi-square annular plates are fixed to the semi-square annular channel steel in layers along the vertical direction; four cantilever webs are fixed to the semi-square annular channel steel along the circumference of the semi-square annular channel steel and are located between the two polygonal semi-square annular plates; two semi-square annular grooves are provided on the outer surface of the semi-square annular channel steel along the vertical direction for laying prestressed steel strand coils; the two sides of the stiffening ribs are respectively fixed to the semi-square annular channel steel and the polygonal semi-square annular plates; a dovetail groove is provided at one end of the polygonal semi-square annular plate; The dovetail grooves of the two first assembled half-ring plate assemblies are spliced ​​and matched to form two complete polygonal square ring plates, and the semi-square annular grooves of the two first assembled half-ring plate assemblies are spliced ​​into two complete square annular grooves, and the semi-square annular channel steels of the two first assembled half-ring plate assemblies are spliced ​​into a complete square annular channel steel and fixed on the outside of the compound steel tube concrete column to form a first assembled ring plate assembly; Two fixed supports are fixed on the square annular channel steel and are respectively located at their respective square annular grooves; two prestressed steel strand coils are respectively laid in their respective square annular grooves, and both ends of each prestressed steel strand coil are fixed in their respective fixed supports by anchors; The second assembled ring plate assembly is formed by splicing two identical second assembled half ring plate assemblies; each second assembled half ring plate assembly comprises a rectangular half square ring plate, a vertical connecting plate and a sawtooth groove; The upper and lower ends of the four vertical connecting plates are respectively fixed between the two rectangular semi-square ring plates; one end of the rectangular semi-square ring plate is provided with a serrated groove; the serrated grooves of the two second assembled semi-square plate assemblies are spliced ​​and matched to form two complete rectangular square ring plates and embrace the outer side of the square annular channel steel to form a second assembled ring plate assembly; The vertical connecting plates are tightly fitted with their respective cantilever webs and fixed by high-strength bolts; the rectangular square ring plates are tightly fitted with their respective polygonal square ring plates and fixed by high-strength bolts; the starting end of the double-web steel beam extends between the first assembled ring plate assembly and the second assembled ring plate assembly, and is in flush contact with the ends of the cantilever webs and the rectangular square ring plates, and is tightly fitted with the vertical connecting plates and the polygonal square ring plates and fixed by high-strength bolts.

[0007] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can realize the assembled connection of double-web steel beams with greater stiffness and strength and composite steel tube concrete columns, which is beneficial to improving the linear stiffness ratio of the composite steel tube concrete structure beam-column structure, enhancing the strength matching of the frame structure, and having superior node mechanical properties. It is simple to manufacture, convenient to construct and convenient to transport.

[0008] (2) The structural components and connectors used in the present invention can be prefabricated in the factory, the nodes are completely bolted, there is no welding at the construction site, the installation operation is simple, the construction efficiency is high, the construction efficiency can be effectively improved, the construction efficiency is economical and durable, and the risk of component damage is low. In addition, since the welding process quality at the construction site is usually worse than that of factory prefabrication, this node can effectively avoid weld defects caused by substandard welding process, such as welding slag, welding pits and welding cracks.

[0009] (3) The node of the present invention is completely bolted and has a certain flexibility when transmitting loads, which can dissipate the transmitted energy well, improve the energy dissipation capacity of the node, and avoid premature brittle failure of the node.

[0010] (4) The outer ring plate of the node of the present invention adopts two assembled ring plate assemblies with different structures. The existence of the first assembled ring plate assembly and the second assembled ring plate assembly makes the stress distribution of the node more uniform, enhances the bearing capacity of the node, improves the mechanical properties of the node, and strengthens the integrity of the ring plate, so that even if it is a pure bolted node, the stiffness is still relatively large.

[0011] The first assembled ring plate assembly is buckled into a ring shape through a dovetail groove, so that the ring plate assembly can be connected into a ring shape without bolts, connecting plates or other connecting parts, and the on-site construction is simple.

[0012] The second assembled ring plate assembly increases the friction bite force by setting a serrated groove at the ring plate connection, and the connection surface of the second assembled ring plate assembly is perpendicular to the connection surface of the first assembled ring plate assembly. This method can further impose annular constraints on the first assembled ring plate assembly and increase the radial pressure of the ring column of the node.

[0013] (5) The node of the present invention applies prestressed steel strand coils between the assembled ring plates. After the bolts are assembled at the construction site, the prestressed steel strand coils are tensioned to the target value and fixed to the fixed support by anchors. This not only strengthens the connection between the assembled ring plate components, enhances the locking force of the ring plates, and improves the integrity of the node, but also further strengthens the locking force of the ring plate components and provides stronger radial pressure on the ring column, ensuring that there is sufficient friction between the steel pipe column and the ring plate component, ensuring that bending moment and shear force can be transmitted at the node.

[0014] (6) The node of the present invention adopts a double-web steel beam to connect with the column. This method can further improve the bending bearing capacity, shear bearing capacity and torsion resistance of the node on the basis of ensuring "strong column and weak beam" and "strong node and weak member", give full play to the mechanical properties of this node, and have better stability and a wider range of applications. If an ordinary H-steel beam is used to connect it, the stiffness of the column and the beam will be very different, the strength will not match, and the superior mechanical properties of the node of this invention cannot be fully utilized.

[0015] The column and beam of the node of the present invention are respectively a composite steel tube concrete column and a double web steel beam, wherein the composite steel tube concrete column has superior bearing capacity, good plasticity and energy consumption, and the composite steel tube concrete column is simpler to construct than ordinary concrete columns, which can improve construction efficiency and shorten construction period. The double web steel beam has the characteristics of light weight, high bearing capacity, good overall stability, etc., is easy to process, economical and durable, and is suitable for large-span factories and high-rise buildings.

[0016] (7) After the assembled ring plate assembly of the node of the present invention is connected, a sleeve structure composed of channel steel will be formed at the end of the node column. The friction surface between the sleeve and the steel pipe column is large, which can generate sufficient friction to ensure the connection of the node. The sleeve can also provide radial pressure of the ring column to the column, thereby improving the vertical bearing capacity of the column.

[0017] (8) The node of the present invention uses one-way high-strength bolts to fix the channel steel in the assembled ring plate assembly to the steel pipe column, making its construction simple, convenient and quick. There is no need to open a temporary process opening on the steel pipe column during construction, and the performance of the steel column is not affected.

[0018] (9) The node can be applied to composite steel tube concrete structures with outer square and inner square, outer square and inner circle, and outer circle and inner circle. It has high rigidity, good integrity and superior mechanical properties.

[0019] (10) The node of the present invention connects the outer ring plate to the outer steel pipe by bolting. The ring plate assembly is simple to manufacture, quick to install and transport. Compared with ordinary ring plate type steel tube concrete nodes, the ring plate is usually fixed to the outer steel pipe by welding. After prefabrication, there is a risk of the ring plate being bumped and deformed during transportation to the construction site, which in turn affects the construction progress and causes economic losses. Therefore, this node can effectively avoid the impact of transportation on the components and ensure the quality of the components and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is an exploded schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of assembling the first assembled ring plate assembly and the second assembled ring plate assembly of the present invention; Figure 4 It is a three-dimensional schematic diagram of a first assembled half-ring plate assembly of the present invention; Figure 5 It is a front view schematic diagram of a first assembled half-ring plate assembly of the present invention; Figure 6 is a schematic top view of a first assembled ring plate assembly of the present invention; Figure 7 is a three-dimensional schematic diagram of a second assembled half-ring plate assembly of the present invention; Figure 8 It is a front view schematic diagram of a second assembled half-ring plate assembly of the present invention; Fig. 9 is a top view schematic diagram of a second assembled ring plate assembly of the present invention; Fig.10 It is a schematic diagram of the connection between the first assembled ring plate assembly, the second assembled ring plate assembly and the double web steel beam of the present invention; Fig.11 It is a top view schematic diagram of a double-web steel beam of the present invention; Fig.12 It is a schematic front view of a double-web steel beam of the present invention; Fig.13 The figure is a schematic diagram of the assembly process of the node of the present invention.

[0021] In the figure, a composite steel tube concrete column 1, a high-strength bolt 2, a one-way high-strength bolt 3, a double-web steel beam 4, a prestressed steel strand coil 5, an anchor 6, a first assembled semi-ring plate assembly 7, a fixed support 8, and a second assembled semi-ring plate assembly 9; External steel pipe 11, internal steel pipe 12; Double web plate 41, flange plate 42; Semi-square annular channel steel 71, polygonal semi-square annular plate 72, cantilever web plate 73, stiffening rib 74, dovetail groove 75, semi-square annular groove 76; Rectangular semi-square ring plate 91 , vertical connecting plate 92 , and sawtooth groove 93 . DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the present invention.

[0023] The present invention provides a composite steel tube concrete column-double web steel beam assembled outer ring plate connection node (referred to as connection node), characterized in that the connection node comprises a vertical composite steel tube concrete column 1, a double web steel beam 4, a prestressed steel strand coil 5, an anchor 6, a first assembled ring plate assembly, a fixed support 8 and a second assembled ring plate assembly; The first assembled ring plate assembly is circumferentially arranged in the middle of the outer side of the composite steel tube concrete column 1, and is formed by splicing two identical first assembled semi-ring plate assemblies 7; each first assembled semi-ring plate assembly 7 includes a semi-square annular channel steel 71, a polygonal semi-square annular plate 72, a cantilever web 73, a stiffening rib 74, a dovetail groove 75 and a semi-square annular groove 76; The semi-square annular channel steel 71 is vertically fixed to the middle part of the outer side of the composite steel tube concrete column 1 by a one-way high-strength bolt 3; two polygonal semi-square ring plates 72 are welded and fixed to the semi-square annular channel steel 71 in layers along the vertical direction; four cantilever webs 73 are fixed to the semi-square annular channel steel 71 along the circumference of the semi-square annular channel steel 71, and are located between the two polygonal semi-square ring plates 72; two semi-square annular grooves 76 are provided on the outer surface of the semi-square annular channel steel 71 along the vertical direction for laying the prestressed steel strand coil 5; the two sides of the stiffening rib 74 are respectively welded and fixed to the semi-square annular channel steel 71 and the polygonal semi-square ring plate 72; a dovetail groove 75 is provided at one end of the polygonal semi-square ring plate 72; The dovetail grooves 75 of the two first assembled semi-ring plate assemblies 7 are spliced ​​and matched to form two complete polygonal square ring plates, and the semi-square annular grooves 76 of the two first assembled semi-ring plate assemblies 7 are spliced ​​into two complete square annular grooves, and the semi-square annular channel steels 71 of the two first assembled semi-ring plate assemblies 7 are spliced ​​into a complete square annular channel steel and are fixed around the outside of the composite steel tube concrete column 1 to form a first assembled ring plate assembly; Two fixed supports 8 are welded and fixed on the square annular channel steel, and are respectively located at respective square annular grooves; two prestressed steel strand coils 5 are respectively laid in respective square annular grooves, and both ends of each prestressed steel strand coil 5 are fixed in respective fixed supports 8 by anchors 6; The second assembled ring plate assembly is formed by splicing two identical second assembled half ring plate assemblies 9; each second assembled half ring plate assembly 9 includes a rectangular half square ring plate 91, a vertical connecting plate 92 and a sawtooth groove 93; The upper and lower ends of the four vertical connecting plates 92 are respectively welded and fixed between the two rectangular semi-square ring plates 91; one end of the rectangular semi-square ring plate 91 is provided with a serrated groove 93; the serrated grooves 93 of the two second assembled semi-ring plate assemblies 9 are spliced ​​and matched to form two complete rectangular square ring plates and embrace the outer side of the square annular channel steel to form a second assembled ring plate assembly; The vertical connecting plates 92 are tightly fitted with their respective cantilever webs 73 and fixed by high-strength bolts 2; the rectangular square ring plates are tightly fitted with their respective polygonal square ring plates and fixed by high-strength bolts 2; the starting end of the double-web steel beam 4 extends between the first assembled ring plate assembly and the second assembled ring plate assembly, and is flush with the ends of the cantilever webs 73 and the rectangular square ring plates, and is tightly fitted with the vertical connecting plates 92 and the polygonal square ring plates and fixed by high-strength bolts 2.

[0024] Preferably, one semi-square annular groove 76 is located between the top of the upper polygonal semi-square ring plate 72 and the cantilever web 73 , and another semi-square annular groove 76 is located between the bottom of the lower polygonal semi-square ring plate 72 and the cantilever web 73 .

[0025] Preferably, the cross-section of the semi-square annular groove 76 is a semicircle, and the cross-section radius is the same as the cross-section radius of the prestressed steel strand coil 5 .

[0026] Preferably, in the first assembled ring plate assembly, eight cantilever webs 73 are evenly fixed on the square annular channel steel along the circumference of the square annular channel steel, and two cantilever webs 73 are fixed on each surface of the square annular channel steel.

[0027] Preferably, in the first assembled ring plate assembly, eight stiffening ribs 74 are evenly arranged along the circumference of the square annular channel steel, and two stiffening ribs 74 are arranged on each surface of the square annular channel steel.

[0028] Preferably, the stiffening rib 74 is an isosceles right triangle.

[0029] Preferably, the two fixing supports 8 are respectively located at the corners of their respective square annular grooves.

[0030] Preferably, in the second assembled ring plate assembly, eight vertical connecting plates 92 are evenly fixed between two rectangular square ring plates along the circumference of the rectangular square ring plates, and two vertical connecting plates 92 are fixed on each surface of the rectangular square ring plate.

[0031] Preferably, the first assembled ring plate component is a ring-shaped structure with an outer dodecagon and an inner rectangle; and the second assembled ring plate component is a rectangular ring plate.

[0032] Preferably, the composite steel tube concrete column 1 comprises an outer steel tube 11 and an inner steel tube 12 of equal length and coaxial arrangement, and concrete; the inner steel tube 12 is located inside the outer steel tube 11; the semi-square annular channel steel 71 is vertically fixed to the middle of the outer side of the outer steel tube 11 by a one-way high-strength bolt 3.

[0033] Preferably, the inner steel pipe 12 is a round steel pipe or a square steel pipe.

[0034] Preferably, the vertical distance between the two polygonal semi-square ring plates 72 is the distance between the upper surface of the upper rectangular semi-square ring plate 91 and the lower surface of the lower rectangular semi-square ring plate 91 .

[0035] Preferably, the size of the inner surface of the rectangular square ring plate is the same as the size of the outer surface of the square ring channel steel.

[0036] Preferably, the double-web steel beam 4 comprises a double web 41 and a flange plate 42; The upper and lower ends of the double web 41 are respectively welded and fixed between the two flange plates 42; the starting end of the double web 41 extends outward from the starting end of the flange plate 42, and the end is flush with the end of the flange plate 42; during installation, the starting end of the double web 41 is flush with the end of the cantilever web 73, and is tightly fitted with the vertical connecting plate 92 and fixed by high-strength bolts 2; the starting end of the flange plate 42 is flush with the end face of the rectangular square ring plate, and is tightly fitted with the polygonal square ring plate and fixed by high-strength bolts 2.

[0037] Preferably, a plurality of bolt holes are provided in the outer square steel tube 11, the semi-square annular channel steel 71, the polygonal semi-square ring plate 72, the cantilever web plate 73, the rectangular semi-square ring plate 91, the vertical connecting plate 92, and the double web plate 41 and the flange plate 42 near the column end, wherein the bolt hole positioning dimensions of the outer square steel tube 11 and the semi-square annular channel steel 71, the polygonal semi-square ring plate 72 and the rectangular semi-square ring plate 91, and the cantilever web plate 73 and the vertical connecting plate 92 match each other and have the same hole diameter.

[0038] The present invention also provides a connection method for a composite steel tube concrete column-double web steel beam assembled outer ring plate connection node, comprising the following steps: S1, placing the prefabricated outer square steel pipe 11 and the inner steel pipe 12 coaxially to form a composite steel pipe column; S2, place two identical first assembled semi-ring plate assemblies 7 close to the outer square steel pipe 11, and move the two first assembled semi-ring plate assemblies 7 vertically until their respective dovetail grooves 75 are locked with each other by snapping, and then insert the one-way high-strength bolts 3 into the semi-square annular channel steel 71 to fix it on the outer square steel pipe 11; S3, between the two polygonal square ring plates of the first assembled ring plate assembly, horizontally move the two second assembled half ring plate assemblies 9 toward the center of the composite steel pipe column until the respective serrated grooves 93 are closed to each other, and the vertical connecting plates 92 are tightly fitted with the respective cantilever webs 73 and the rectangular square ring plates are tightly fitted with the respective polygonal square ring plates, and then insert high-strength bolts 2 to fix the vertical connecting plates 92 with the cantilever webs 73 and the rectangular square ring plates with the polygonal square ring plates; Preferably, after the first assembled ring plate assembly is assembled, the second assembled semi-ring plate assembly 9 is assembled between the polygonal semi-square ring plates 72, and its connecting surface is perpendicular to the connecting surface of the first assembled ring plate assembly, so as to enhance the locking force and further increase the radial pressure of the ring column.

[0039] S4, extend the starting end of the double web steel beam 4 between the first assembled ring plate assembly and the second assembled ring plate assembly, the starting end of the double web 41 is flush with the end of the cantilever web 73 and fits tightly with the vertical connecting plate 92, and the starting end of the flange plate 42 is flush with the end surface of the rectangular square ring plate and fits tightly with the polygonal square ring plate; then insert the high-strength bolt 2 to fix the starting end of the double web 41 to the vertical connecting plate 92, and fix the starting end of the flange plate 42 to the polygonal square ring plate, so as to realize the connection between the assembled ring plate assembly and the double web steel beam 4; S5, repeat S4 to complete the connection between the double web steel beam 4 and the compound steel pipe column in four directions; S6, after the prestressed steel strand coil 5 is stretched to the target value, it is laid in the square annular groove and anchored to the fixed support 8 by the anchor 6; S7. Pour self-compacting concrete into the composite steel pipe column. The node connection is now completed.

[0040] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A composite steel tube concrete column-double web steel beam assembled outer ring plate connection node, characterized in that: The connection node comprises a composite steel tube concrete column (1), a double web steel beam (4), a prestressed steel strand coil (5), an anchor (6), a first assembled ring plate assembly, a fixed support (8) and a second assembled ring plate assembly; The first assembled ring plate assembly is arranged on the outer side of the composite steel tube concrete column (1) along the circumferential direction, and is formed by splicing two identical first assembled half ring plate assemblies (7); each first assembled half ring plate assembly (7) comprises a half square annular channel steel (71), a polygonal half square annular plate (72), a cantilever web plate (73), a stiffening rib (74), a dovetail groove (75) and a half square annular groove (76); A semi-square annular channel steel (71) is vertically fixed to the outer side of a composite steel tube concrete column (1) by means of a one-way high-strength bolt (3); two polygonal semi-square annular plates (72) are fixed to the semi-square annular channel steel (71) in a layered manner along a vertical direction; four cantilever web plates (73) are fixed to the semi-square annular channel steel (71) along the circumference of the semi-square annular channel steel (71) and are located between the two polygonal semi-square annular plates (72); two semi-square annular grooves (76) are provided on the outer surface of the semi-square annular channel steel (71) along a vertical direction for laying prestressed steel strand coils (5); two sides of a stiffening rib (74) are respectively fixed to the semi-square annular channel steel (71) and the polygonal semi-square annular plate (72); a dovetail groove (75) is provided at one end of the polygonal semi-square annular plate (72); The dovetail grooves (75) of the two first assembled semi-ring plate assemblies (7) are spliced ​​together to form two complete polygonal square ring plates, and the semi-square annular grooves (76) of the two first assembled semi-ring plate assemblies (7) are spliced ​​together to form two complete square annular grooves, and the semi-square annular channel steels (71) of the two first assembled semi-ring plate assemblies (7) are spliced ​​together to form a complete square annular channel steel and fixed to the outer side of the composite steel tube concrete column (1), thereby forming a first assembled ring plate assembly; Two fixed supports (8) are fixed on the square annular channel steel and are respectively located at respective square annular grooves; two prestressed steel strand coils (5) are respectively laid in respective square annular grooves, and both ends of each prestressed steel strand coil (5) are fixed to respective fixed supports (8) via anchors (6); The second assembled ring plate assembly is formed by splicing two identical second assembled half ring plate assemblies (9); each second assembled half ring plate assembly (9) comprises a rectangular half square ring plate (91), a vertical connecting plate (92) and a sawtooth groove (93); The upper and lower ends of the four vertical connecting plates (92) are respectively fixed between the two rectangular semi-square ring plates (91); one end of each rectangular semi-square ring plate (91) is provided with a sawtooth groove (93); the sawtooth grooves (93) of the two second assembled semi-square plate assemblies (9) are spliced ​​and matched to form two complete rectangular square ring plates and embrace the outer side of the square annular channel steel to form a second assembled ring plate assembly; The vertical connection plates (92) are tightly fitted with their respective cantilever webs (73) and fixed by high-strength bolts (2); the rectangular square ring plates are tightly fitted with their respective polygonal square ring plates and fixed by high-strength bolts (2); the starting end of the double-web steel beam (4) extends between the first assembled ring plate assembly and the second assembled ring plate assembly, is in flush contact with the ends of the cantilever webs (73) and the rectangular square ring plates, and is tightly fitted with the vertical connection plates (92) and the polygonal square ring plates and fixed by high-strength bolts (2).

2. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1 is characterized in that: One semi-square annular groove (76) is located between the upper polygonal semi-square annular plate (72) and the top end of the cantilever web (73), and the other semi-square annular groove (76) is located between the lower polygonal semi-square annular plate (72) and the bottom end of the cantilever web (73).

3. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: The cross-section of the semi-square annular groove (76) is a semicircle, and the cross-section radius is the same as the cross-section radius of the prestressed steel strand coil (5).

4. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: In the first assembled ring plate assembly, eight cantilever webs (73) are evenly fixed to the square annular channel steel along the circumference of the square annular channel steel, and two cantilever webs (73) are fixed on each surface of the square annular channel steel; Eight stiffening ribs (74) are evenly arranged along the circumference of the square annular channel steel, and two stiffening ribs (74) are arranged on each surface of the square annular channel steel; The stiffening rib (74) is an isosceles right triangle.

5. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: The two fixed supports (8) are respectively located at the corners of their respective square annular grooves.

6. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: In the second assembled ring plate assembly, eight vertical connection plates (92) are evenly fixed between two rectangular square ring plates along the circumference of the rectangular square ring plates, and two vertical connection plates (92) are fixed on each surface of the rectangular square ring plate.

7. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: The first assembled ring plate component is a ring structure with an outer dodecagon and an inner rectangle; the second assembled ring plate component is a rectangular ring plate.

8. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: The composite steel tube concrete column (1) comprises an outer square steel tube (11) and an inner steel tube (12) which are coaxially arranged with equal length, and concrete; the inner steel tube (12) is located inside the outer square steel tube (11); and the semi-square annular channel steel (71) is vertically fixed to the middle part of the outer side of the outer square steel tube (11) by means of one-way high-strength bolts (3).

9. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 8, characterized in that: The inner steel pipe (12) is a round steel pipe or a square steel pipe.

10. The composite steel tube concrete column-double web steel beam assembled outer ring plate connection node according to claim 1, characterized in that: The double-web steel beam (4) comprises a double web (41) and a flange plate (42); The upper and lower ends of the double web (41) are respectively fixed between the two flange plates (42); the starting end of the double web (41) extends outward from the starting end of the flange plate (42), and the end thereof is flush with the end of the flange plate (42); during installation, the starting end of the double web (41) is flush with the end of the cantilever web (73), and is tightly fitted with the vertical connecting plate (92) and fixed by high-strength bolts (2); the starting end of the flange plate (42) is flush with the end surface of the rectangular square ring plate, and is tightly fitted with the polygonal square ring plate and fixed by high-strength bolts (2).

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