A steel-concrete composite beam-column joint mortise and tenon structure

Abstract

The application discloses a steel-concrete composite beam column joint mortise and tenon structure, which comprises an upper steel pipe column and a lower steel pipe column; a connecting steel pipe column is further arranged between the upper steel pipe column and the lower steel pipe column, the upper end of the connecting steel pipe column is fixedly connected with the lower end of the upper steel pipe column, and the lower end of the connecting steel pipe column is fixedly connected with the upper end of the lower steel pipe column. A core pipe is arranged in the connecting steel pipe column, and a plurality of fixing members are arranged on the core pipe, so that the steel beam can be connected with the core pipe through clamping, thereby reducing on-site welding operation and ensuring the connecting strength of the joint.

Description

Technical Field

[0001] This invention relates to the field of building structure technology, specifically to a steel-concrete composite beam-column joint tenon and mortise structure. Background Technology

[0002] Currently, the connection between the U-shaped steel-concrete composite beam and the steel-concrete composite column is crucial to the structural load-bearing capacity of a building. To ensure the beam-column connection meets design requirements, traditional diaphragm or outer ring plate designs are typically used, and these are welded to the column on-site to secure the connection. However, due to the semi-closed cross-section of the U-shaped steel and the large number of components involved in the connection, the on-site welding workload is enormous. Furthermore, the welding of the steel beam to the column from the underside is done overhead, which is difficult to perform due to its location, making it challenging to guarantee weld quality. Even skilled welders often struggle to ensure weld quality in this location, ultimately posing significant structural safety risks. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a steel-concrete composite beam-column joint tenon and mortise structure to solve the problems of large welding volume, high welding difficulty, difficulty in ensuring weld quality, and impact on structural safety in the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A steel-concrete composite beam-column joint tenon and mortise structure includes an upper steel pipe column and a lower steel pipe column; a connecting steel pipe column is also provided between the upper and lower steel pipe columns, the upper end of the connecting steel pipe column being fixedly connected to the lower end of the upper steel pipe column, and its lower end being fixedly connected to the upper end of the lower steel pipe column; an inner partition is provided at the upper end of the lower steel pipe column, the lower surface of the inner partition being fixedly connected to the upper end of the lower steel pipe column; a core tube is provided above the inner partition, the core tube being located inside the connecting steel pipe column, the axis of the core tube coinciding with the axis of the connecting steel pipe column, and its lower end being connected to the upper surface of the inner partition; multiple fasteners are provided on the outer surface of the core tube, the length direction of the fasteners being consistent with the length direction of the core tube, and the fasteners being L-shaped; located on the same outer surface of the core tube and... Two adjacent fasteners are positioned with one end facing each other, and their other ends are fixedly connected to the outer surface of the core tube, so that the two ends of the two adjacent fasteners facing each other on the same outer surface of the core tube form a groove with the outer surface of the core tube; at least one steel beam is provided on the outside of the connecting steel pipe column, and a slot is opened on the connecting steel pipe column at the position corresponding to the steel beam, one end of the slot extending vertically downward from the top of the connecting steel pipe column, so that one end of the steel beam can be placed in the slot; an end plate is provided at one end of the steel beam, one side of the end plate is fixedly connected to one end of the steel beam, and the end plate can be inserted into the groove, so that the steel beam is fixedly connected to the core tube; an upper partition is also provided at the upper end of the core tube, the upper partition is flush with the top of the steel beam, and is fixedly connected to the inner wall of the core tube.

[0006] Preferably, the lower end of the end plate extends out of the slot after being inserted into the slot, so that the upper end of the end plate is flush with the upper end of the core tube, and the lower end of the end plate is located outside the lower end of the core tube.

[0007] Preferably, a plurality of openings are provided on the inner partition plate at the position corresponding to the end plate. The openings penetrate the two opposing side walls of the inner partition plate, so that after the lower end of the end plate extends out of the slot, it can continue to pass through the openings and extend into the lower steel pipe column.

[0008] Preferably, a through hole I is provided in the middle of the inner partition, and the through hole I penetrates the two opposing side walls of the inner partition.

[0009] Preferably, a plurality of armhole plates are provided below the steel beam. The armhole plates are distributed at intervals around the core tube. One side of the armhole plate is fixedly connected to the steel beam, and the other side adjacent to it is fixedly connected to the side of the end plate away from the core tube.

[0010] Preferably, a plurality of connecting plates I are provided above the connecting steel pipe column. The connecting plates I are L-shaped and are fixedly connected to the upper end of the connecting steel pipe column.

[0011] Preferably, a connecting plate II is provided at the lower end of the upper steel pipe column, the upper side of the connecting plate II is fixedly connected to the lower end of the upper steel pipe column, and the upper steel pipe column is fixedly connected to the connecting plate I through the connecting plate II.

[0012] Preferably, a through hole II is provided in the middle of the connecting plate II, and the through hole II penetrates the two opposing side walls of the connecting plate II.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This invention improves the structure of the joint by creating grooves on the connecting steel pipe column and setting fasteners on the core tube, allowing the U-shaped steel beam to be inserted into the grooves of the steel pipe column from top to bottom. The end plate of one end of the U-shaped steel beam is then inserted into the fastener on the core tube, forming a lever connection. After the concrete is poured, cement grout fills the gaps between the components, making the joint more robust. This also allows the U-shaped steel beam and the connecting steel pipe column to be fixedly connected without welding, ensuring the strength of the connection and avoiding the adverse effects of welding on the joint strength.

[0015] 2. In this invention, the upper and lower steel pipe columns can be fixedly connected to the connecting steel pipe columns by bolts. Compared with traditional connection nodes, the amount of on-site welding in the node described in this invention is greatly reduced, the assembly efficiency is improved, and the construction period is greatly shortened. In addition, the node also avoids welding in the cold bending area of ​​the U-shaped steel, ensuring the load-bearing capacity and ductility of the node connection.

[0016] 3. In this invention, the groove depth of the connecting steel pipe column is greater than the height of the U-shaped steel beam, so that there is an opening area in the steel pipe column within a certain height range from the upper flange of the U-shaped steel beam. This facilitates the longitudinal reinforcement of the composite beam in the negative bending moment area to pass through the steel pipe column, solving the problem of difficult arrangement of longitudinal reinforcement in the negative bending moment area of ​​ordinary beam-column joints. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a steel-concrete composite beam-column joint tenon and mortise structure according to the present invention.

[0018] Figure 2 for Figure 1 AA view.

[0019] Figure 3 This is a schematic diagram of the structure after the steel pipe column is connected to the inner diaphragm.

[0020] Figure 4 This is a schematic diagram of the structure after the steel beam is connected to the end plate and the haunch plate.

[0021] In the diagram: 1. Upper steel pipe column, 2. Lower steel pipe column, 3. Connecting steel pipe column, 4. Inner partition, 5. Core tube, 6. Fixing component, 7. Steel beam, 8. Slot, 9. End plate, 10. Opening, 11. Through hole I, 12. Armhole plate, 13. Connecting plate I, 14. Rib plate I, 15. Rib plate II, 16. Upper partition, 17. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the present invention are within the scope of protection of the present invention.

[0023] This invention provides a mortise and tenon structure for steel-concrete composite beam-column joints, such as... Figures 1-4As shown, the system includes an upper steel pipe column 1 and a lower steel pipe column 2. A connecting steel pipe column 3 is also provided between the upper steel pipe column 1 and the lower steel pipe column 2. The upper end of the connecting steel pipe column 3 is fixedly connected to the lower end of the upper steel pipe column 1, and its lower end is fixedly connected to the upper end of the lower steel pipe column 2. An inner partition 4 is provided at the upper end of the lower steel pipe column 2, and the lower surface of the inner partition 4 is fixedly connected to the upper end of the lower steel pipe column 2. A core tube 5 is provided above the inner partition 4. The core tube 5 is located inside the connecting steel pipe column 3, and the axis of the core tube 5 coincides with the axis of the connecting steel pipe column 3. Its lower end is connected to the upper surface of the inner partition 4. Multiple fixing members 6 are provided on the outer surface of the core tube 5. The length direction of the fixing members 6 is consistent with the length direction of the core tube 5, and the fixing members 6 are L-shaped. Two adjacent fasteners 6 located on the same outer surface of the core tube 5 are positioned opposite each other at one end, and their other ends are fixedly connected to the outer surface of the core tube 5, forming a groove between the two opposite ends of the two adjacent fasteners 6 on the same outer surface of the core tube 5. At least one steel beam 7 is provided on the outer side of the connecting steel pipe column 3. A slot 8 is provided on the connecting steel pipe column 3 at the position corresponding to the steel beam 7. One end of the slot 8 extends vertically downward from the top of the connecting steel pipe column 3, allowing one end of the steel beam 7 to be placed within the slot 8. The number of steel beams can be adjusted according to the positions of the upper and lower steel pipe columns, making the node structure of the present invention applicable to steel beams in different positions, such as L-shaped nodes, T-shaped nodes, and cross-shaped nodes. The steel beam 7 can be an I-beam or a U-shaped steel beam, but is preferably a U-shaped steel beam. An end plate 9 is provided at one end of the steel beam. One side of the end plate 9 is fixedly connected to one end of the steel beam 7, and the end plate 9 can be inserted into the groove, thus fixing the steel beam 7 to the core tube 5. An upper partition plate 17 is provided at the upper end of the core tube. The upper partition plate is flush with the top of the steel beam, and its four edges are fixedly connected to the inner wall of the core tube. After the concrete is poured, the cement grout fills the gaps between the steel beams, making the joint more solid after the concrete hardens. This structurally achieves a fixed connection between the steel beam 7 and the connecting steel pipe column 3, ensuring the connection strength of the joint. At the same time, no welding operation is required between the steel beam 7 and the connecting steel pipe column 3, which reduces the problem of large welding volume between the U-shaped steel beam and the steel pipe column in the prior art, avoids overhead welding of the lower flange of the U-shaped steel, and reduces the impact of welding operation on the joint strength and ductility. Furthermore, the upper partition plate 17 at the upper end of the core tube can transmit the internal force of the upper flange of the U-shaped steel beam, ensuring the stability of the force transmission at the upper end of the core tube; at the same time, an opening is made in the middle of the upper partition plate to facilitate concrete pouring. In practical implementation, the connecting steel pipe columns are weakened due to the slotting. Therefore, the thickness of the remaining steel pipe portion of the slot should be determined according to the requirement of equal strength, and the wall thickness of the connecting steel pipe column must be greater than the wall thickness of the upper and lower steel pipe columns, i.e. B 2 t 2 f y2 ≥ B 1t 1 f y1 ,in B 1. t 1. f y1 The width, thickness, and yield strength of the steel plate on one side of the lower steel pipe column are given. B 2. t 2. f y2 The width, thickness, and yield strength of the remaining steel plate on one side of the connecting steel pipe column are specified.

[0024] When the U-shaped steel beam is connected to the column in two continuous directions, i.e., a slotted connection is used at the intersection of the U-shaped steel beams, this type of connection is only suitable for middle column nodes and requires that the beam top elevations be consistent. When the U-shaped steel beam is connected to the column in one continuous direction, i.e., one direction of the U-shaped steel beam is continuous and the other direction of the U-shaped steel beam is held in place by a fixing member of the continuous beam, this type of connection is only suitable for middle and side column nodes, and requires that the continuous beam be long enough to demonstrate the advantages of this type of node. However, if the continuous beam is too long, it will lead to difficulties in transportation and hoisting, and the overall cost may not necessarily be reduced. In this invention, the beams in both directions are non-continuous beams, with one beam corresponding to each column span, which facilitates transportation and hoisting. The mortise and tenon connections are all implemented inside the column, which can adapt to different beam heights and different beam top elevations. At the same time, this invention also considers the application of thin-walled steel pipe columns. The cross-sectional dimensions of ordinary rectangular or square steel-concrete composite columns should not be less than 400mm, the thickness of the steel tube should not be less than 8mm, and the ratio of the width to the thickness of the steel tube should not exceed the limit of 60 × (235 / f ak ) 0.5 ,in f ak This refers to the standard value for the tensile strength of the steel pipe. Here, "thin-walled steel pipe column" refers to a steel-concrete composite column where the ratio of the width to the thickness of the steel pipe exceeds this limit, and the steel content is between 4% and 5%. This type of thin-walled steel pipe column has good application prospects due to its lower steel consumption. However, in actual construction, it has been found that when connecting this type of steel pipe column to the column joint using existing U-shaped steel-concrete composite beams, excessive welding exacerbates its adverse effects, failing to leverage the advantages of the thin-walled steel pipe column and making it difficult to ensure the strength of the joint. Therefore, the mortise and tenon structure of the joint described in this invention can completely avoid the impact of these adverse factors on the joint structure.

[0025] In some embodiments, the upper surface of the steel beam is located below the slot opening, while the top of the core tube is flush with the upper surface of the steel beam. That is, the entire steel beam is completely located inside the slot, and there is a gap between the upper surface of the steel beam and the slot opening. This structure allows the reinforcing bars above the steel beam to pass through the opposite sides of the connecting steel pipe column and the opposite sides of the core tube, reserving space for the reinforcing bars above the steel beam without affecting the overall setup of the node.

[0026] In some embodiments, the upper surface of the steel beam is located above the slot opening, making the upper surface of the steel beam higher than the slot opening. However, this structure does not affect the placement of the reinforcing bars above the steel beam. In this embodiment, the shape of the lower end of the upper steel column can be adjusted, and a slot I is also provided at the lower end of the upper steel column, allowing the portion of the steel beam above the slot opening to extend into the slot I. Simultaneously, a gap is created between the upper surface of the steel beam and the bottom of the slot I, which also facilitates the placement of the reinforcing bars above the steel beam. This embodiment does not affect the overall strength of the joint, but subsequent decorative work on the joint is required.

[0027] In practical implementation, the lower end of the end plate extends into the slot and then protrudes out of the slot, making the upper end of the end plate flush with the upper end of the core tube, and the lower end of the end plate located outside the lower end of the core tube. Multiple openings 10 are provided on the inner partition plate at positions corresponding to the end plate. These openings 10 penetrate the opposing sidewalls of the inner partition plate 4, allowing the lower end of the end plate 9 to continue through the openings 10 and extend into the lower steel pipe column 2 after protruding from the slot. A through hole I 11 is provided in the middle of the inner partition plate 4, penetrating the opposing sidewalls of the inner partition plate, allowing concrete to flow from the connecting steel pipe column into the lower steel pipe column. Multiple haunch plates 12 are also provided below the steel beam 7, spaced around the core tube 5. One side of each haunch plate 12 is fixedly connected to the steel beam 7, and the adjacent side is fixedly connected to the side of the end plate 9 opposite to the core tube 5. The haunch plates further enhance the force transmission capacity of the end plate. Above the connecting steel pipe column 3, multiple connecting plates I13 are provided. Each connecting plate I is L-shaped, with its lower side fixedly connected to the upper end of the connecting steel pipe column. A gap exists between the facing ends of adjacent connecting plates I, slightly larger than the width of the steel beam. This gap further expands the opening area above the steel beam, facilitating the passage of longitudinal reinforcement in the negative bending moment region of the composite beam through the steel pipe column. Below the connecting plates I, multiple reinforcing plates I15 are provided. These reinforcing plates I are spaced apart circumferentially along the connecting steel pipe column, with their upper sides fixedly connected to the lower sides of the connecting plates I. The side of the reinforcing plate I closest to the connecting steel pipe column is also fixedly connected to the connecting steel pipe column. A connecting plate II 14 is provided at the lower end of the upper steel pipe column. The upper side of the connecting plate II is fixedly connected to the lower end of the upper steel pipe column, and the upper steel pipe column is fixedly connected to the connecting plate I through the connecting plate II. That is, the connecting plate II on the upper steel pipe column and multiple connecting plates I at the upper end of the connecting steel pipe column are fixedly connected by high-strength bolts. This can further reduce on-site welding operations and ensure the connection strength between the upper steel pipe column and the connecting steel pipe column. Multiple reinforcing plates II 16 are provided above the connecting plate II. The reinforcing plates II are distributed circumferentially around the upper steel pipe column, and the lower side of the reinforcing plate II is fixedly connected to the upper side of the connecting plate II. The side of the reinforcing plate II closest to the upper steel pipe column is fixedly connected to the upper steel pipe column. A through hole II is opened in the middle of the connecting plate II, and the through hole II penetrates the two opposing sidewalls of the connecting plate II.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A steel-concrete composite beam-column joint tenon and mortise structure, characterized in that, It includes an upper steel pipe column (1) and a lower steel pipe column (2); a connecting steel pipe column (3) is also provided between the upper steel pipe column and the lower steel pipe column, the upper end of the connecting steel pipe column is fixedly connected to the lower end of the upper steel pipe column, and its lower end is fixedly connected to the upper end of the lower steel pipe column. An inner partition (4) is provided at the upper end of the lower steel pipe column. The lower surface of the inner partition is fixedly connected to the upper end of the lower steel pipe column. A core tube (5) is provided above the inner partition. The core tube is located inside the connecting steel pipe column. The axis of the core tube coincides with the axis of the connecting steel pipe column, and its lower end is connected to the upper surface of the inner partition. Multiple fasteners (6) are provided on the outer surface of the core tube. The length direction of the fastener is consistent with the length direction of the core tube, and the fastener is L-shaped. Two fasteners located on the same outer surface of the core tube and adjacent to each other are arranged opposite to each other, and their other ends are fixedly connected to the outer surface of the core tube, so that the two ends of the two fasteners arranged opposite to each other on the same outer surface of the core tube form a groove with the outer surface of the core tube. At least one steel beam (7) is provided on the outside of the connecting steel pipe column. A slot (8) is opened on the connecting steel pipe column at the position corresponding to the steel beam. One end of the slot extends vertically downward from the top of the connecting steel pipe column so that one end of the steel beam can be placed in the slot. An end plate (9) is provided at one end of the steel beam. One side of the end plate is fixedly connected to one end of the steel beam, and the end plate can be inserted into the slot so that the steel beam is fixedly connected to the core tube. An upper partition plate (17) is also provided at the upper end of the core tube. The upper partition plate is flush with the top of the steel beam and is fixedly connected to the inner wall of the core tube.

2. The steel-concrete composite beam-column joint tenon and mortise structure according to claim 1, characterized in that, The lower end of the end plate extends into the slot and can extend out of the slot, so that the upper end of the end plate is flush with the upper end of the core tube, and the lower end of the end plate is located outside the lower end of the core tube.

3. The mortise and tenon structure for steel-concrete composite beam-column joints according to claim 2, characterized in that, Multiple openings (10) are provided on the inner partition plate at the position corresponding to the end plate. The openings penetrate the two opposing side walls of the inner partition plate, so that after the lower end of the end plate extends out of the slot, it can continue to pass through the openings and extend into the lower steel pipe column.

4. The mortise and tenon structure for steel-concrete composite beam-column joints according to claim 1, characterized in that, Multiple haunch plates (12) are provided below the steel beam. The haunch plates are distributed at intervals around the core tube. One side of the haunch plate is fixedly connected to the steel beam, and the other side adjacent to it is fixedly connected to the side of the end plate away from the core tube.

5. The mortise and tenon structure for steel-concrete composite beam-column joints according to claim 1, characterized in that, Multiple connecting plates I (13) are provided above the connecting steel pipe column. The connecting plates I are L-shaped and are fixedly connected to the upper end of the connecting steel pipe column.

6. The mortise and tenon structure for steel-concrete composite beam-column joints according to claim 5, characterized in that, A connecting plate II (14) is provided at the lower end of the upper steel pipe column. The upper side of the connecting plate II is fixedly connected to the lower end of the upper steel pipe column, and the upper steel pipe column is fixedly connected to the connecting plate I through the connecting plate II.

7. The steel-concrete composite beam-column joint tenon and mortise structure according to claim 6, characterized in that, A through hole II is provided in the middle of the connecting plate II, and the through hole II penetrates the two opposing side walls of the connecting plate II.

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