An assembled square steel tube confined concrete column-beam node

Abstract

The present invention discloses an assembled square steel tube constrained concrete column-beam node, comprising an upper column steel tube at the node, a middle connecting steel tube, a lower column steel tube at the node, and a structural beam at the side; the upper column steel tube at the node, the middle connecting steel tube, and the lower column steel tube at the node are aligned vertically; the structural beam is circumferentially arranged on the outside of the middle connecting steel tube, and the longitudinal reinforcement of the structural beam horizontally extends into the interior of the upper and lower column steel tubes through a first notch and a second notch, and the upper and lower column steel tubes at the node, the middle connecting steel tube, and the structural beam are cast together by concrete. The beneficial effects of the present invention are as follows: the upper and lower column steel tubes at the node are connected to the middle connecting steel tube, and are connected to the structural beam at the side through a horizontal connecting partition, and the longitudinal reinforcement of the structural beam extends into the interior of the square steel tube. This node form is convenient to construct, the force transmission path is simple and clear, the node rigidity is large, the bearing capacity is high, and the shear resistance is greatly improved. At the same time, it solves the problem of excessive stirrups and inconvenient construction in the node area due to shear resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to an assembled square steel tube confined concrete column-beam node. Background Art

[0002] In recent years, my country's prefabricated buildings and building industrialization have developed rapidly. Steel tube confined concrete structure has emerged as a new type of prefabricated structural system. This system has good mechanical properties and good economy, and has been increasingly widely used.

[0003] Joints are key components of building frames, especially after a structure experiences a strong earthquake and enters the elastoplastic stage. Joints play a crucial role in the integrity and stability of the structure. Severe damage to joints at locations where shear forces and bending moments are greatest under earthquakes can lead to structural collapse. Therefore, the current focus of research on steel-contained concrete (CFST) structures is on how to connect reinforced concrete beams to concrete-filled steel tube (CFST) columns, how to reinforce the joints, and how to ensure simple and reliable construction of the joints. In-depth research on the construction and seismic performance of CFST column-CFST beam joints, and the development of safe, reliable, and easy-to-construct joint forms and design methods, are crucial for promoting the widespread application of CFST structures in engineering.

[0004] At present, existing steel tube confined concrete structures use ring reinforcement nodes or semi-through nodes in the core area of ​​steel tube confined concrete columns and reinforced concrete beams. The former has a large diameter of column stirrups in the core area, while the latter has a small opening, both of which make it difficult to thread the longitudinal reinforcement of the beam. In addition, the construction operation surface is small, making it difficult to tie the steel bars and pour concrete in the core area. Summary of the Invention

[0005] The object of the present invention is to provide an assembled square steel tube confined concrete column-beam node with a tripod-shaped variable thickness reinforced connecting steel tube, which is convenient to construct and addresses the deficiencies of the existing technology.

[0006] The technical solution adopted by the present invention is: an assembled square steel tube constrained concrete column-beam node, comprising an upper column steel tube, a lower column steel tube, a node upper column steel tube, a middle connecting steel tube, a node lower column steel tube and a side structural beam; the node upper column steel tube, the middle connecting steel tube and the node lower column steel tube are aligned up and down; the lower end four corners of the node upper column steel tube extend downward to form a first extension section, the first extension section is connected to the upper end of the middle connecting steel tube; two adjacent first extension sections and the middle connecting steel tube are enclosed to form a connection with the node upper column steel tube. The four corners of the upper end of the node lower column steel pipe extend upward to form a second extension section, the second extension section is connected to the lower end of the middle connecting steel pipe, and the two adjacent second extension sections and the middle connecting steel pipe are enclosed to form a second notch connected to the interior of the node lower column steel pipe; the structural beam is circumferentially arranged on the outside of the middle connecting steel pipe, and the longitudinal reinforcement of the structural beam extends horizontally into the interior of the upper and lower column steel pipes of the node through the first notch and the second notch, and the upper and lower column steel pipes of the node, the middle connecting steel pipe and the structural beam are cast into one by concrete.

[0007] According to the above scheme, the upper four corners of the middle connecting steel pipe are upper connecting areas adapted to the position of the first extension section, the upper connecting area is in contact with the first extension section, and the upper connecting area is located on the inner side of the first extension section, and the two are connected by a number of bolts; the lower four corners of the middle connecting steel pipe are lower connecting areas adapted to the second extension section, the lower connecting area is in contact with the second extension section, and the lower connecting area is located on the inner side of the second extension section, and the two are connected by a number of bolts.

[0008] According to the above scheme, horizontal connecting partitions are provided in the node upper column steel pipe and the node lower column steel pipe; the horizontal connecting partition includes four partition units connected end to end in sequence, and the middle parts of the four partition units are enclosed to form a through hole; each partition unit includes a mounting frame and an outward-extending flange plate, and the flange plate is fixed to the outer edge of the mounting frame.

[0009] According to the above scheme, the horizontal connecting partition connected to the node column steel pipe, the mounting frames of its four partition units are connected in sequence, the outer edge of the mounting frame is connected to the inner wall of the node column steel pipe, and the flange plate extends horizontally through the top of the first notch and is connected to the upper part of the structural beam.

[0010] According to the above scheme, the horizontal connecting partition connected to the steel pipe of the lower column of the node, the mounting frames of its four partition units are connected in sequence, the outer edge of the mounting frame is connected to the inner wall of the steel pipe of the lower column of the node, and the flange plate extends horizontally through the bottom of the second notch and is connected to the lower part of the structural beam at this location.

[0011] According to the above scheme, the four upper corners of the upper column steel pipe of the node and the four lower corners of the lower column steel pipe are respectively provided with oblique stiffening ribs; the oblique stiffening ribs are triangular, and their two side edges are connected to the two inner side walls of the upper column steel pipe of the node or the lower column steel pipe of the node; the oblique stiffening ribs are inclined toward the centroid of the column section of the upper column steel pipe of the node or the lower column steel pipe of the node.

[0012] According to the above solution, the oblique stiffening rib is provided with a central hole.

[0013] According to the above solution, both the first extension section and the second extension section have an L-shaped corner structure in cross-section.

[0014] According to the above solution, the middle connecting steel pipe is a square pipe that is compatible with the upper and lower column steel pipes of the node; the middle connecting steel pipe is formed by welding four special-shaped and variable-thickness steel plates.

[0015] The beneficial effects of the present invention are:

[0016] 1. In the present invention, the upper and lower column steel pipes of the node are connected to the middle connecting steel pipe, and are connected to the side structural beams through horizontal connecting partitions. The longitudinal reinforcement of the structural beam extends into the interior of the square steel pipe. This node form is convenient to construct, the force transmission path is simple and clear, the node stiffness is large, the bearing capacity is high, and the shear resistance is greatly improved. At the same time, it solves the problem of excessive stirrups and inconvenient construction in the node area due to shear resistance problems.

[0017] 2. The node upper and lower column steel pipes, horizontal connecting partitions, and oblique stiffening ribs in the node area of ​​the present invention can be welded together in advance in the factory to form a combined square steel pipe of the node upper and lower columns;

[0018] 3. The oblique stiffening ribs in the present invention can not only resist horizontal shear force, but also tighten the outer square steel tube inward when subjected to axial force, thereby enhancing its restraint effect. The holes on the oblique stiffening ribs are not only convenient for the passage of longitudinal reinforcement, but also convenient for the pouring of concrete.

[0019] 4. The horizontal connecting diaphragms in this invention not only resist shear forces at the beam-column connection but also shift the plastic hinge outward, complying with the "strong joint, weak component" design standard. They also integrate the beam and column, enhancing structural rigidity and integrity. The upper and lower horizontal connecting steel plates reduce the compressive height of the joint area, significantly improving the bearing capacity of the core area. Furthermore, the horizontal connecting diaphragms secure the column longitudinal reinforcement, improving its ability to resist buckling.

[0020] 5. In the present invention, the horizontal connecting partition is overlapped on the variable thickness reinforced connecting steel pipe to form a structural core tube, which enhances the restraining effect of the steel pipe on the concrete at the node position, not only enhancing the bearing capacity of the concrete, but also enabling the steel pipe and concrete to work better together.

[0021] 6. In the present invention, the connection area of ​​the tripod-shaped variable thickness reinforced connecting steel pipe is bolted, which is convenient for construction, and the thickened steel plate in the reinforced area enhances the restraining ability of the steel pipe on the core concrete, greatly improving its shear resistance and restraining ability. At the same time, the integrity of the inner wall of the reinforced steel pipe is stronger, and the tedious construction of welding on the inner wall of the steel pipe is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of a specific embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the elevation structure of the column steel pipe at the node.

[0024] Figure 3 Schematic diagram of the elevation structure of the column steel pipe under the node.

[0025] Figure 4 Schematic diagram of the horizontal connection partition structure.

[0026] Figure 5 This is a structural diagram of the middle connecting steel pipe.

[0027] Figure 6 This is a structural diagram of the core tube.

[0028] Figure 7 This is a structural diagram of the middle connecting steel pipe.

[0029] Figure 8 for Figure 7 CC cross-sectional view.

[0030] Figure 9 Schematic diagram of the connection between the column steel pipe on the node and the horizontal connecting partition and oblique stiffener.

[0031] Figure 10 Schematic diagram of the connection between the column steel pipe at the node and the horizontal connecting partition and oblique stiffener.

[0032] Figure 11 Schematic diagram of the connection between the node and the upper and lower column steel pipes.

[0033] In the figure: 1-node upper column steel pipe, 1.1-first extension section, 1.2-first notch, 2-node lower column steel pipe, 2.1-second extension section, 2.2-second notch, 3-oblique stiffening rib, 4-horizontal connecting partition, 4.1-mounting frame, 4.2-flange plate, 5-middle connecting steel pipe, 5.1-upper connecting area, 5.2-lower connecting area, 5.3-connecting steel pipe reinforcement area, 6-bolt, 7-structural beam, 8-upper column steel pipe, 9-lower column steel pipe. DETAILED DESCRIPTION

[0034] In order to better understand the present invention, the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 and Figure 6The assembled square steel tube confined concrete column-beam node shown in FIG. 1 includes an upper column steel tube 1, a middle connecting steel tube 5, a lower column steel tube 2, and a side structural beam 7; the upper column steel tube 1, the middle connecting steel tube 5, and the lower column steel tube 2 are aligned vertically; the lower end corners of the upper column steel tube 1 extend downward to form a first extension section 1.1 (as shown in FIG. Figure 2 As shown), the first extension section 1.1 is connected to the upper end of the middle connecting steel pipe 5; the two adjacent first extension sections 1.1 and the middle connecting steel pipe 5 enclose a first notch 1.2 that is connected to the interior of the node upper column steel pipe 1; the upper end four corners of the node lower column steel pipe 2 extend upward to form a second extension section 2.1 (as shown Figure 3 As shown), the second extension section 2.1 is connected to the lower end of the middle connecting steel pipe 5, and the two adjacent second extension sections 2.1 and the middle connecting steel pipe 5 enclose a second notch 2.2 that is connected to the interior of the node lower column steel pipe 2; the structural beam 7 is circumferentially arranged on the outside of the middle connecting steel pipe 5, and the longitudinal reinforcement of the structural beam 7 extends horizontally into the interior of the upper and lower column steel pipes of the node through the first notch 1.2 and the second notch 2.2. The upper and lower column steel pipes of the node, the middle connecting steel pipe 5 and the structural beam 7 are cast into one body by concrete.

[0036] In the present invention, the first extension section 1.1 and the second extension section 2.1 are both L-shaped corner structures; the central connecting steel pipe 5 is a square pipe that matches the upper and lower column steel pipes; the first notch 1.2 and the second notch 2.2 are square or rectangular. There are four structural beams 7, each provided on the outer circumference of the central connecting steel pipe 5.

[0037] Preferably, if Figure 5 、 7 As shown in Figure 8, the middle connecting steel pipe 5 is a tripod-shaped variable thickness structure, and its upper four corners are provided with upper connecting areas 5.1 that are adapted to the position of the first extension section 1.1. The upper connecting area 5.1 is in contact with the first extension section 1.1, and the upper connecting area 5.1 is located on the inner side of the first extension section 1.1, and the two are connected by a number of bolts 6; the lower four corners of the middle connecting steel pipe 5 are provided with lower connecting areas 5.2 that are adapted to the second extension section 2.1. The lower connecting area 5.2 is in contact with the second extension section 2.1, and the lower connecting area 5.2 is located on the inner side of the second extension section 2.1, and the two are connected by a number of bolts 6.

[0038] Preferably, the central connecting steel pipe 5 is formed by welding together four pieces of deformed and variable-thickness steel plates. During factory prefabrication, the deformed and variable-thickness steel plates are machined from thickened steel plates (the thickness of the thickened steel plates is generally 2 to 2.5 times that of the upper and lower column steel pipes). First, the upper outer side of the thickened steel plate is thinned overall, and a rectangular area is carved out in the center to form a first notch 1.2. The remaining protruding portion of the upper area serves as the upper connecting area 5.1. Then, the lower outer side of the thickened steel plate is thinned overall, and a rectangular area is carved out in the center to form a second notch 2.2. The two remaining protruding portions of the lower area serve as the lower connecting area 5.2. The unthinned central area serves as the reinforced area 5.3 of the central connecting steel pipe 5. Specifically, the sum of the thicknesses of the upper connecting area 5.1 and the first extension 1.1, and the sum of the thicknesses of the lower connecting area 5.2 and the second extension 2.1, are both equal to the thickness of the reinforced area 5.3 of the central connecting steel pipe 5.

[0039] Preferably, the node upper column steel pipe 1 and the node lower column steel pipe 2 are both provided with a horizontal connecting partition 4; Figure 4 As shown, the horizontal connecting partition 4 includes four partition units connected end to end in sequence, and the middle parts of the four partition units are enclosed to form a through hole; each partition unit includes a mounting frame 4.1 and an outwardly extending flange plate 4.2, and the flange plate 4.2 is fixed to the outer edge of the mounting frame 4.1.

[0040] Preferably, the mounting frame 4.1 is provided with strip holes to facilitate the passage of column longitudinal reinforcement for fixation and subsequent concrete pouring.

[0041] In the present invention, Figure 9 As shown, the horizontal connecting partition 4 connected to the node column steel pipe 1 has four partition unit mounting brackets 4.1 connected in sequence. The outer edge of the mounting bracket 4.1 is connected to the inner wall of the node column steel pipe 1. The flange plate 4.2 extends horizontally through the top of the first notch 1.2 and is connected to the upper part of the structural beam 7. Figure 10 As shown, the horizontal connecting partition 4 connected to the node column steel pipe 2 has four partition unit mounting brackets 4.1 connected in sequence. The outer edge of the mounting bracket 4.1 is connected to the inner wall of the node column steel pipe 2. The flange plate 4.2 extends horizontally through the bottom of the second notch 2.2 and is connected to the lower part of the structural beam 7 at that location.

[0042] Preferably, the four upper corners of the node upper column steel pipe 1 and the four lower corners of the node lower column steel pipe 2 are respectively provided with oblique stiffening ribs 3; the oblique stiffening ribs 3 are triangular, and their two side edges are connected to the two inner side walls of the node upper column steel pipe 1 or the node lower column steel pipe 2; the oblique stiffening ribs 3 are inclined toward the centroid of the column section of the node upper column steel pipe 1 or the node lower column steel pipe 2.

[0043] Preferably, the oblique stiffening rib 3 is provided with a central hole to facilitate concrete pouring and the passage of steel bars.

[0044] In this embodiment, the oblique stiffening ribs 3 are respectively welded and fixed to the node upper column steel pipe 1 and the node lower column steel pipe 2.

[0045] In actual construction, the column-beam node and the upper and lower column steel pipes (column bodies) are poured into one piece by concrete, and gaps are left between the upper column steel pipe 1 and the upper column steel pipe 8, and between the lower column steel pipe 2 and the lower column steel pipe 9. Figure 11 As shown. Each steel pipe is a square steel pipe. The construction process of the present invention is:

[0046] 1. Fabricate the node upper column steel tube 1; weld oblique stiffening ribs 3 to the top four corners of the node upper column steel tube 1, with the top corners of the oblique stiffening ribs 3 facing downward and inclined toward the centroid of the column cross-section of the node upper column steel tube 1; provide first extension sections 1.1 at the four lower corners of the upper column steel tube 1, forming first notches 1.2 between adjacent first extension sections 1.1. The first notches 1.2 mate with the upper horizontal connecting diaphragm 4 (enabling the flange 4.2 of the horizontal connecting diaphragm 4 to extend through the top of the first notches 1.2); and provide bolt holes in the first extension sections 1.1.

[0047] 2. Fabricate the node lower column steel pipe 2: Weld oblique stiffening ribs 3 at the four bottom corners of the node lower column steel pipe 2, with the top corners of the oblique stiffening ribs 3 facing downward and inclined toward the centroid of the column cross-section of the lower column steel pipe 2. Provide second extension sections 2.1 at the four upper corners of the node lower column steel pipe 2, forming second notches 2.2 between two connected second extension sections 2.1. The second notches 2.2 are adapted to the lower horizontal connecting diaphragm 4 (enabling the flange 4.2 of the horizontal connecting diaphragm 4 to extend through the bottom of the second notches 2.2). Provide bolt holes in the second extension sections 2.1.

[0048] 3. Fabricate the middle connecting steel pipe 5: Use four pieces of special-shaped and variable-thickness steel plates to enclose and weld together to form the middle connecting steel pipe 5. Set upper connecting areas 5.1 corresponding to the positions of the first extension section 1.1 at the top four corners of the middle connecting steel pipe 5, and set lower connecting areas 5.2 corresponding to the positions of the second extension section 2.1 at the bottom four corners of the middle connecting steel pipe 5.

[0049] 4. Sleeve the upper connection area 5.1 at the top of the middle connecting steel pipe 5 with the four first extension sections 1.1 of the node upper column steel pipe 1 (the upper connection area 5.1 is located inside the first extension section 1.1 and the two are in contact), and fix them with bolts 6; sleeve the four lower connection areas 5.2 at the top of the middle connecting steel pipe 5 with the four second extension sections 2.1 of the node lower column steel pipe 2 (the lower connection area 5.2 is located inside the second extension section 2.1 and the two are in contact), and fix them with bolts 6; then weld and reinforce the upper and lower column steel pipes 1 and 2 of the node and the middle connecting steel pipe 5 through outer welds.

[0050] 5. Arrange the reinforcement of the side structural beam 7 and the upper and lower column steel pipes of the node. The longitudinal reinforcement of the structural beam 7 is inserted into the upper and lower column steel pipes 2 of the node through the first notch 1.2 and the second notch 2.2 and fixed. Finally, pour concrete to connect the side structural beam 7, the upper and lower column steel pipes 2 and the middle connecting square pipe into one. The outer side steel pipes serve as column formwork.

[0051] In the present invention, the setting of the middle connecting steel pipe 5 plays the role of strengthening the node, enhancing the restraining effect of the steel pipe at the node on the concrete, so that the steel pipe and concrete can work together better; its shear resistance and restraint capacity are greatly improved, while strengthening the integrity of the inner wall of the steel pipe, and avoiding the tedious construction of welding on the inner wall of the steel pipe.

[0052] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. An assembled square steel tube confined concrete column-beam node, characterized in that: The top end of the node is connected with the bottom end of the node, and the bottom end of the node is connected with the top of the node. The upper four corners of the middle connecting steel pipe are upper connecting areas adapted to the position of the first extension section. The upper connecting area fits in with the first extension section and is located inside the first extension section. The two are connected by a number of bolts. The lower four corners of the middle connecting steel pipe are lower connecting areas adapted to the second extension section. The lower connecting area fits in with the second extension section and is located inside the second extension section. The two are connected by a number of bolts. Horizontal connecting partitions are provided in the steel pipes of the upper and lower nodes. The horizontal connecting partitions include four partition units connected end to end, with the middle portions of the four partition units enclosing a through hole. Each partition unit includes a mounting frame and an outwardly extending flange plate, and the flange plate is fixed to the outer edge of the mounting frame. The mounting frame is provided with a strip-shaped hole.

2. The assembled square steel tube confined concrete column-beam node according to claim 1, characterized in that: The horizontal connecting partition connected to the node column steel pipe has four partition unit mounting frames connected in sequence, the outer edge of the mounting frame is connected to the inner wall of the node column steel pipe, and the flange plate extends horizontally through the top of the first notch and is connected to the upper part of the structural beam.

3. The assembled square steel tube confined concrete column-beam node according to claim 1, characterized in that: The horizontal connecting partition connected to the steel pipe of the node column has four partition unit mounting frames connected in sequence, the outer edge of the mounting frame is connected to the inner wall of the steel pipe of the node column, and the flange plate extends horizontally through the bottom of the second notch and is connected to the lower part of the structural beam at this location.

4. The assembled square steel tube confined concrete column-beam node according to claim 1, characterized in that: The four upper corners of the node upper column steel pipe and the four lower corners of the node lower column steel pipe are respectively provided with oblique stiffening ribs.

5. The assembled square steel tube confined concrete column-beam node according to claim 4, characterized in that: The oblique stiffening rib is triangular, and its two sides are connected to the two inner walls of the node upper column steel pipe or the node lower column steel pipe; the oblique stiffening rib is inclined toward the column section centroid of the node upper column steel pipe or the node lower column steel pipe.

6. The assembled square steel tube confined concrete column-beam node according to claim 4, characterized in that: The oblique stiffening rib is provided with a central hole.

7. The assembled square steel tube confined concrete column-beam node according to claim 1, characterized in that: The first extension section and the second extension section both have an L-shaped corner structure in cross section.

8. The assembled square steel tube confined concrete column-beam node according to claim 1, characterized in that: The middle connecting steel pipe is a square pipe adapted to the node upper column steel pipe and the node lower column steel pipe; the middle connecting steel pipe is formed by welding four special-shaped variable thickness steel plates.

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