A tenon-mortise connection structure of a U-shaped steel reinforced concrete composite beam column

Abstract

The application discloses a tenon-mortise connecting structure of a U-shaped steel concrete combined beam column, which comprises vertically arranged upper steel pipe columns, lower steel pipe columns and reinforced steel pipe columns; the reinforced steel pipe columns are located between the upper steel pipe columns and the lower steel pipe columns, and upper and lower ends of the reinforced steel pipe columns are fixedly connected with the upper steel pipe columns and the lower steel pipe columns respectively; a plurality of grooves are formed in the reinforced steel pipe columns, the grooves penetrate through side walls of the reinforced steel pipe columns, and one end of each groove extends vertically downward from an upper end of the reinforced steel pipe column; after the steel beam I and the steel beam II are cross arranged, the steel beam I and the steel beam II are arranged in the grooves of the reinforced steel pipe columns, and the steel beam I and the steel beam II are U-shaped steel beams.

Description

Technical Field

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

[0002] Currently, U-shaped steel-concrete composite beams are increasingly used in practical engineering projects due to their advantages such as high load-bearing capacity, high stiffness, good ductility, and good fire resistance, as they fully utilize the tensile properties of steel and the compressive properties of concrete. To improve economic efficiency, U-shaped steel is mass-produced using a standardized production model of one-time cold bending of thin steel plates. When this U-shaped steel-concrete composite beam is connected to the column, the beam-column joint is the key to the structural stress. Since the U-shaped steel is a semi-closed section, when this beam-column joint is connected by the traditional inner diaphragm, through diaphragm or outer ring plate, there are many problems: (1) Due to the structural characteristics of the U-shaped steel beam itself, a section of U-shaped steel beam is pre-welded to the column in the factory and then welded to the remaining section on site. On the one hand, this will increase the amount of welding, and on the other hand, it is inconvenient to transport the steel column with the corbel. (2) Based on point (1), this beam-column joint is welded on the construction site, but the amount of on-site welding is very large. At the same time, due to the simultaneous existence of overhead welding, vertical welding and flat welding processes, the welding difficulty is high and the weld quality is difficult to guarantee. Moreover, the cold-bent U-shaped steel has a cold bending zone welding, which makes the weld brittle, resulting in a reduction in the load-bearing capacity and ductility of the joint, thus affecting the promotion and use of U-shaped steel beams. 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 U-shaped steel-concrete composite beam-column tenon-and-mortise connection structure to solve the problems of difficult welding process, difficulty in guaranteeing welding quality, and reduction of joint bearing capacity and ductility after welding in the existing technology.

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

[0005] A U-shaped steel-concrete composite beam-column tenon-and-mortise connection structure includes an upper steel pipe column, a lower steel pipe column, and a reinforced steel pipe column arranged vertically. The reinforced steel pipe column is located between the upper and lower steel pipe columns, and its upper and lower ends are fixedly connected to the upper and lower steel pipe columns, respectively. Multiple slots are opened on the reinforced steel pipe column, the slots penetrating the side wall of the reinforced steel pipe column, and one end of the slot extends vertically downward from the upper end of the reinforced steel pipe column. Steel beam I and steel beam II are arranged intersectingly and placed in the slots of the reinforced steel pipe column, and both steel beam I and steel beam II are U-shaped steel beams.

[0006] Preferably, a groove I is provided on the upper side of steel beam I, and a groove II is provided on the lower side of steel beam II. Steel beam I is located below steel beam II and is connected to steel beam II after being engaged by groove I and groove II.

[0007] Preferably, a through hole is provided on the lower side of the steel beam I and at the position corresponding to the groove I, the through hole penetrating the opposite side walls of the steel beam I; multiple reinforcing bars are laid at the bottom inside the steel beam II, so that the reinforcing bars can penetrate the steel beam I through the through hole on the steel beam I.

[0008] Preferably, a plurality of connectors are provided on the upper side of the connection between steel beam I and steel beam II, with both ends of the connectors located above steel beam I.

[0009] Preferably, a partition is provided between the lower end of the reinforced steel pipe column and the upper end of the lower steel pipe column. The lower surface of the partition is fixedly connected to the upper end of the lower steel pipe column, and its upper surface is fixedly connected to the lower end of the reinforced steel pipe column. An opening is provided in the middle of the partition, which penetrates the opposite sides of the partition.

[0010] Preferably, a plurality of end plates are provided at the upper end of the reinforced steel pipe column, the end plates being located above the adjacent side walls of the reinforced steel pipe column and fixedly connected to the upper end of the reinforced steel pipe column; a connecting plate is provided at the lower end of the upper steel pipe column, the upper side of the connecting plate being fixedly connected to the lower end of the upper steel pipe column, and the upper steel pipe column being fixedly connected to the end plates on the reinforced steel pipe column through the connecting plate.

[0011] Preferably, a plurality of stiffening plates I are provided below the end plate. The stiffening plates I are arranged vertically and located on the outside of the reinforced steel pipe column, and are laid at intervals and fixedly connected to the lower surface of the end plate.

[0012] Preferably, a plurality of stiffening plates II are provided above the connecting plate. The stiffening plates II are located on the outside of the upper steel pipe column and are arranged in the vertical direction. The stiffening plates II are distributed at intervals along the circumference of the connecting plate, and their lower ends are fixedly connected to the upper surface of the connecting plate.

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

[0014] 1. This invention adjusts the connection structure between the U-shaped steel beam and the steel pipe column, eliminating the need for welding between them. The U-shaped steel beam and the steel pipe column can be directly connected via reinforced steel pipe columns, avoiding welding in the cold bending area of ​​the U-shaped steel beam, reducing the number of welds, and ensuring weld quality. This solves the problems of reduced connection load-bearing capacity and poor ductility. Furthermore, the reinforced steel pipe column has slots for placing the U-shaped beam, significantly reducing on-site welding at the joints, improving assembly efficiency, and greatly shortening the construction period. Simultaneously, multiple connectors are used above the U-shaped steel beam for lap joint force transmission, ensuring the continuity of force transmission at the joints of the main beam.

[0015] 2. The present invention strengthens the steel pipe column by making the groove depth greater than the height of the U-shaped steel beam, so that the steel pipe column has an opening area within a certain height range from the upper flange of the U-shaped steel beam. This is to facilitate the longitudinal reinforcement of the composite beam in the negative bending moment area to pass through the steel pipe column, and solves the problem of difficult longitudinal reinforcement arrangement in the negative bending moment area of ​​ordinary beam-column joints. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a U-shaped steel-concrete composite beam-column tenon-and-mortise connection structure according to the present invention.

[0017] Figure 2 for Figure 1 AA view.

[0018] Figure 3 This is a structural schematic diagram of steel beam I and its reinforcing bars.

[0019] Figure 4 This is a structural schematic diagram of steel beam II and its reinforcing bars.

[0020] Figure 5 A schematic diagram of the structure after strengthening the connection between the steel pipe column and the partition.

[0021] In the diagram: Upper steel pipe column 1, Lower steel pipe column 2, Reinforced steel pipe column 3, Slot 4, Steel beam I 5, Steel beam II 6, Groove I 7, Groove II 8, Through hole 9, Reinforcing bar 10, Connector 11, Partition plate 12, End plate 13, Connecting plate 14, Stiffening plate I 15, Stiffening plate II 16. 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 U-shaped steel-concrete composite beam-column tenon-and-mortise connection structure, such as... Figures 1-5As shown, the structure includes a vertically arranged upper steel pipe column 1, a lower steel pipe column 2, and a reinforced steel pipe column 3. The reinforced steel pipe column is located between the upper and lower steel pipe columns, with its upper and lower ends fixedly connected to the upper and lower steel pipe columns, respectively. Multiple slots 4 are formed on the reinforced steel pipe column 3, penetrating its sidewall, with one end extending vertically downwards from the upper end of the reinforced steel pipe column. Steel beams I 5 and II 6 are intersected and placed within the slots of the reinforced steel pipe column, and both steel beams I and II are U-shaped steel beams. The intersecting arrangement of steel beams I and II allows them to be directly placed within the slots of the reinforced steel pipe column, eliminating the need for welding at the contact points between steel beams I, II, and the reinforced steel pipe column. This solves the problem of excessive welding when using traditional methods with internal partitions, through partitions, or outer ring plates for U-shaped steel beams and steel pipe columns, facilitating on-site assembly and improving construction efficiency. The width of the slots is 3-5 mm wider than the beams to facilitate beam placement. Considering that the reinforced steel pipe column is weakened due to the slotting, the thickness of the remaining steel pipe portion of the slot should be determined according to the requirement of equal strength, that is, B 2 t 2 f y2 ≥ B 1 t 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 To enhance the width, thickness, and yield strength of the remaining steel plate on one side of the steel pipe column, ensuring the reinforced steel pipe column reaches the required strength, the U-shaped steel beam is cold-bent and pressed, resulting in a U-shaped cross-section. The upper edges of the U-shaped steel beam are bent inwards or outwards and extend horizontally to form upper flanges. Furthermore, at the intersection of steel beams I and II, pouring holes are provided at the bottom of both beams, and these holes are aligned. During pouring, the concrete in steel beams I and II can connect with the concrete inside the reinforced steel pipe column, thereby improving the connection between the steel pipe and the steel pipe column.

[0024] The connection structure described in this invention is applicable to various connections between steel pipe columns and steel beams, especially thin-walled steel pipe columns, wherein the upper and lower steel pipe columns can be thin-walled. In this invention, the thin-walled steel pipe is not simply determined by its thickness. Existing technology specifies that the cross-sectional dimensions of ordinary rectangular or square steel-concrete composite columns should not be less than 400mm, the steel pipe thickness should not be less than 8mm, and the ratio of the steel pipe width to its thickness should not exceed the limit of 60 × (235 / fak ) 0.5 ,in f ak This refers to the standard value for the tensile strength of steel pipes. The thin-walled steel-concrete composite column mentioned in this invention 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 steel pipe column meets national standards while saving steel consumption, thus further improving economic efficiency and showing great application prospects. However, this invention finds that in existing technologies, when connecting U-shaped steel-concrete composite beams to columns, the excessive welding workload and the simultaneous presence of multiple welding processes lead to high overall welding difficulty at the joints and difficulty in guaranteeing weld quality. These adverse effects are further amplified when connecting the new thin-walled steel-concrete composite column to beams. Because the wall thickness of this type of steel pipe column is lower than that of ordinary steel pipe columns, the welding quality is even more difficult to control than in existing technologies. Therefore, this invention aims to improve the connection structure, minimizing the amount of welding, and even achieving welding-free operation while ensuring that the connection structure meets design requirements.

[0025] In some embodiments, such as Figure 1 , 3As shown in Figure 4, steel beams I and II are intersected using a mortise and tenon joint. Steel beam I has a groove I on its upper side, and steel beam II has a groove II on its lower side. Steel beam I is located below steel beam II and is connected to steel beam II by engaging grooves I and II, creating a mortise and tenon joint structure between them. This connection method further enhances the stability of the connection between steel beams I and II. However, the intersecting connection between steel beams I and II is not limited to mortise and tenon joints. The grooves in steel beams I and II solve the problem of overlapping positions, allowing for relatively larger errors and making construction more convenient. A through hole is provided on the lower side of steel beam I, corresponding to the position of groove I. This through hole penetrates both opposite side walls of steel beam I. Multiple reinforcing bars are laid at the bottom inside steel beam II, allowing them to pass through the through hole in steel beam I. Since the lower flange of steel beam II is cut off, the force transmission of the lower flange is interrupted, and the reinforcing bars are used for the lap joint force transmission of the lower flange of steel beam II, ensuring continuous force transmission at the joint. This type of connection node, with the U-shaped steel beam extending in two directions, avoids direct welding in the cold bending zone on-site, improving the node's load-bearing capacity and ductility. Multiple protective elements are fitted onto the reinforcing bars, spaced apart along the length of the bars. These protective elements are ring-shaped and fixedly connected to the reinforcing bars. The straight-line distance between the surface of the reinforcing bar and the outermost edge of the protective element is equal to the thickness of the concrete cover on the reinforcing bar surface, ensuring sufficient concrete coverage for force transmission. In actual construction, the reinforcing bars with the fixed protective elements can be placed directly at the bottom of steel beam II, with both ends of the reinforcing bars passing through through holes in steel beam I. After concrete pouring, the concrete anchors the reinforcing bars, while the bars also transmit force, ensuring the continuity of force transmission at the bottom of steel beam II. Multiple end plates 13 are provided at the upper end of the reinforced steel pipe column. These end plates are located above the adjacent side walls of the reinforced steel pipe column and are fixedly connected to the upper end of the reinforced steel pipe column. A connecting plate 14 is provided at the lower end of the upper steel pipe column. The upper side of the connecting plate is fixedly connected to the lower end of the lower steel pipe column. The upper steel pipe column is fixedly connected to the end plate on the reinforced steel pipe column through the connecting plate. Below the end plate 13, multiple stiffening plates I 15 are also provided. The stiffening plates I are arranged vertically and located on the outside of the reinforced steel pipe column. The stiffening plates I are spaced apart and fixedly connected to the lower surface of the end plate. The end plate is L-shaped and located on the outside of the upper end of the reinforced steel pipe column. Its open end is attached to and fixedly connected to the outer wall of the reinforced steel pipe column. The stiffening plates I are spaced apart along the length of the end plate, and the adjacent sides of the stiffening plates I are fixedly connected to the outer side of the reinforced steel pipe column and the lower surface of the end plate, respectively. Multiple stiffening plates II 16 are provided above the connecting plate 14. The stiffening plates II are located on the outside of the upper steel pipe column and are arranged in the vertical direction. The stiffening plates II are distributed circumferentially along the connecting plate. Their lower ends are fixedly connected to the upper surface of the connecting plate, and their side adjacent to their lower ends is fixedly connected to the outer surface of the upper steel pipe column.Under this structure, there are several ways to position the steel beams I and II after they are crossed with the reinforced steel pipe column: (1) The uppermost side of the connection between steel beam I and steel beam II is located below the slot opening, so that steel beam I and steel beam II are completely placed in the slot of the reinforced steel pipe column. In this way, there is a gap between the uppermost side of the connection between steel beam I and steel beam II and the connecting plate on the upper steel pipe column, so that the longitudinal reinforcement above steel beam II can pass through the upper steel pipe column through the gap. (2) The uppermost side of the connection between steel beam I and steel beam II is located above the slot opening, so that only a part of steel beam I and steel beam II are placed in the slot of the reinforced steel pipe column. In this implementation method, the position of steel beam I and steel beam II does not affect the overall effect of the connection structure. However, the drawback is that since part of steel beam I or steel beam II is located outside the slot, the appearance of the node needs to be decorated afterward.

[0026] In some embodiments, a plurality of connectors 11 are provided on the upper side of the connection between steel beam I and steel beam II, with both ends of the connectors located above steel beam I 5. The connectors can be implemented in various ways. One connector can be a connecting steel plate, which covers the groove I 7 of steel beam I and the portion where steel beam II intersects with steel beam I. Both ends of the connecting steel plate are fixedly connected to both sides of the groove I of steel beam I. Alternatively, the connector can be a connecting reinforcing bar, on which the aforementioned protective element can be fitted. This connecting reinforcing bar is located above the groove I of steel beam I, its length direction is consistent with steel beam I, and it does not need to be welded to steel beam I; the two can be fixedly connected using poured concrete.

[0027] In some embodiments, a partition 12 is further provided between the lower end of the reinforced steel pipe column and the upper end of the lower steel pipe column. The lower surface of the partition is fixedly connected to the upper end of the lower steel pipe column, and its upper surface is fixedly connected to the upper end of the upper steel pipe column. An opening is provided in the middle of the partition, which extends through the opposite sides of the partition. The opening is used to allow concrete to flow from inside the reinforced steel pipe column into the lower steel pipe column during concrete pouring.

[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 U-shaped steel-concrete composite beam-column tenon-and-mortise connection structure, characterized in that, It includes an upper steel pipe column (1), a lower steel pipe column (2), and a reinforced steel pipe column (3) arranged vertically; the reinforced steel pipe column is located between the upper steel pipe column and the lower steel pipe column, and its upper and lower ends are fixedly connected to the upper steel pipe column and the lower steel pipe column, respectively. Multiple slots (4) are provided on the reinforced steel pipe column. The slots penetrate the side wall of the reinforced steel pipe column, and one end of the slot extends vertically downward from the top of the reinforced steel pipe column. Steel beam I (5) and steel beam II (6) are intersected and placed in the slots of the reinforced steel pipe column. Both steel beam I and steel beam II are U-shaped steel beams. The upper side of steel beam I is provided with groove I (7), and the lower side of steel beam II is provided with groove II (8). Steel beam I is located below steel beam II and is connected to steel beam II after being engaged by groove I and groove II. A through hole (9) is provided on the lower side of steel beam I and at the position corresponding to groove I. The through hole penetrates the opposite side walls of steel beam I. Multiple steel bars (10) are laid at the bottom inside steel beam II so that the steel bars can penetrate steel beam I through the through hole on steel beam I. Multiple end plates (13) are provided at the upper end of the reinforced steel pipe column. The end plates are located above the adjacent side walls of the reinforced steel pipe column and are fixedly connected to the upper end of the reinforced steel pipe column. A connecting plate (14) is provided at the lower end of the upper steel pipe column. The upper side of the connecting plate is fixedly connected to the lower end of the upper steel pipe column. The upper steel pipe column is fixedly connected to the end plates on the reinforced steel pipe column through the connecting plate. Below the end plate (13), there are also a plurality of stiffening plates I (15). The stiffening plates I are arranged vertically and located on the outside of the reinforced steel pipe column. The stiffening plates I are laid at intervals and fixedly connected to the lower surface of the end plate. The end plate is L-shaped and located on the outside of the upper end of the reinforced steel pipe column. Its open end is attached to and fixedly connected to the outer wall of the reinforced steel pipe column. The stiffening plates I are distributed at intervals along the length of the end plate. The adjacent sides of the stiffening plates I are fixedly connected to the outside of the reinforced steel pipe column and the lower surface of the end plate, respectively. Above the connecting plate (14), there are a plurality of stiffening plates II (16). The stiffening plates II are located on the outside of the upper steel pipe column and are arranged vertically. The stiffening plates II are distributed at intervals along the circumference of the connecting plate. Its lower end is fixedly connected to the upper surface of the connecting plate, and the side adjacent to its lower end is fixedly connected to the outer surface of the upper steel pipe column.

2. The half-timbered structure according to claim 1, wherein Multiple connectors (11) are provided on the upper side of the connection between steel beam I and steel beam II, with both ends of the connectors located above steel beam I.

3. The half-timbered structure according to claim 1, wherein A partition (12) is provided between the lower end of the reinforced steel pipe column and the upper end of the lower steel pipe column. The lower surface of the partition is fixedly connected to the upper end of the lower steel pipe column, and its upper surface is fixedly connected to the lower end of the reinforced steel pipe column. An opening is provided in the middle of the partition, which penetrates the opposite sides of the partition.

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