A steel pipe concrete composite column structure connecting joint

Abstract

The utility model relates to building structure engineering technical field, and disclose a kind of steel pipe concrete composite column structure connecting joint, by optimizing the arrangement of beam longitudinal reinforcement, effectively avoid the spatial interference of reinforcement and prestressed steel strand, ensure that prestress can be smoothly applied and transmission, solve the interference problem of reinforcement and prestressed component, steel column is connected rigidly with the beam end connecting piece of concrete beam by node connecting plate, floor and steel column, concrete beam are closely adhered, the bearing capacity and stability of node are improved, the integrity and force transmission reliability of node are strengthened, the setting of slow-bonding prestressed steel strand can offset tensile stress generated under the action of load of structure, effectively control crack development, the constraint of stirrup enhances the integrity of reinforcement cage and the ductility of concrete, make node have good seismic performance under the action of horizontal load such as earthquake, not prone to damage, improve the crack resistance and seismic delay of structure, and the connection mode is simple and reliable, and construction is convenient.

Description

Technical Field

[0001] This utility model relates to the field of building structure engineering technology, specifically a connection node for a steel-concrete composite column structure. Background Technology

[0002] In modern building structures, steel-concrete composite structures combine the advantages of high strength and convenient construction of steel with the high rigidity and good fire resistance of concrete, and are widely used in various building projects. Among them, the connection nodes between steel columns and concrete beams and floor slabs are the key parts of structural force transmission, and their performance directly affects the safety, stability and durability of the entire building structure.

[0003] In existing technologies, connection nodes in steel-concrete composite column structures are typically achieved by directly anchoring the longitudinal reinforcement of the beam to the steel column or by lapping the node plates. Large stadiums are generally ultra-long structures, and temperature changes can cause significant stress changes in the concrete floor slabs, potentially leading to cracking. Therefore, prestressing is usually incorporated into the structural floor slabs to offset temperature stress. Currently, slow-bonded prestressed steel strands are commonly used as prestressing, but this method has several drawbacks: Firstly, the arrangement of the longitudinal reinforcement of the beam can easily interfere with the prestressing members, preventing the prestressed steel strands from smoothly traversing the node area, affecting the prestressing effect, and consequently reducing the structure's crack resistance and load-bearing capacity. Secondly, traditional nodes have poor overall integrity, and under horizontal loads such as earthquakes, they are prone to shear failure in the node area and reinforcement anchorage failure, affecting the seismic safety of the structure. Furthermore, in some node designs, the connection between the floor slab and the steel column or concrete beam is not tight enough, resulting in discontinuous load transfer, uneven structural stiffness distribution, and a tendency for stress concentration.

[0004] Therefore, there is an urgent need for a structurally sound, reliable force transmission, and convenient construction method for connecting steel-concrete composite columns to solve the technical problems of interference between steel bars and prestressed components, insufficient integrity, and poor seismic performance in existing joints. Utility Model Content

[0005] The purpose of this utility model is to provide a connection node for a steel-concrete composite column structure. By optimizing the arrangement of the steel bars and prestressed steel strands inside the node, the connection strength between the steel column and the concrete beam and floor slab is strengthened, the prestress is effectively applied, the integrity, load-bearing capacity and seismic performance of the node are improved, and the construction process is simplified and the construction efficiency is improved.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a connection node for a steel-concrete composite column structure, comprising a steel column body, a concrete beam, a floor slab, longitudinal reinforcement bars of the beam, and loosely bonded prestressed steel strands; the concrete beam is laterally fixed to the side wall of the steel column body, and the floor slab is cast on top of the concrete beam and fits against the side wall of the steel column body; the longitudinal reinforcement bars of the beam are arranged along the length of the concrete beam, and the loosely bonded prestressed steel strands include beam body steel strands and floor slab steel strands. The beam body steel strands are arranged within the concrete beam along the length of the concrete beam, and the floor slab steel strands are arranged within the floor slab along the length of the floor slab. Both the beam body steel strands and the floor slab steel strands avoid the arrangement area of ​​the longitudinal reinforcement bars of the beam and pass through the connection node between the steel column body and the concrete beam.

[0007] Preferably, the longitudinal reinforcement of the beam is arranged in two parallel rows within the concrete beam, and the spacing between adjacent longitudinal reinforcement bars is not less than the diameter of the reinforcement bar and not less than 25 mm.

[0008] Preferably, the two rows of longitudinal steel bars of the beam are symmetrically distributed, and the central axis of each row of steel bars is parallel to the central axis of the concrete beam section.

[0009] Preferably, the beam steel strands are located in the interlayer gaps between the longitudinal reinforcing bars of multiple rows of beams.

[0010] Preferably, the steel column body sidewall is fixedly connected with a node connection plate, and the concrete beam is pre-embedded with a beam end connector. The node connection plate and the beam end connector are fixedly connected by fasteners.

[0011] Preferably, the concrete beam is further provided with stirrups, which are arranged at intervals along the length of the concrete beam and are sleeved on the outside of the longitudinal reinforcement of the beam, and are tied and fixed to the longitudinal reinforcement of the beam.

[0012] Preferably, when the floor slab steel strands pass through the beam-column joint, they avoid the top area of ​​the longitudinal reinforcement of the beam along the thickness direction of the floor slab, and the vertical spacing between the floor slab steel strands and the longitudinal reinforcement of the beam is not less than 30mm.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By optimizing the arrangement of longitudinal steel bars in the beams, and placing the beam steel strands in the gaps between steel bar layers, while ensuring that the floor slab steel strands avoid the top area of ​​the steel bars and maintain sufficient spacing, spatial interference between the steel bars and prestressed steel strands is effectively avoided, ensuring that prestress can be smoothly applied and transferred, thus solving the problem of interference between steel bars and prestressed members.

[0014] The steel columns are rigidly connected to the beam end connectors of the concrete beams through node connection plates. The floor slab is closely fitted with the steel columns and concrete beams to form an integrated load-bearing system. The load transfer path is clear and continuous, avoiding stress concentration, improving the load-bearing capacity and stability of the nodes, and enhancing the integrity and load transfer reliability of the nodes.

[0015] The use of loosely bonded prestressed steel strands can offset the tensile stress generated in the structure under load, effectively controlling crack propagation; the restraining effect of stirrups enhances the integrity of the steel cage and the ductility of concrete, giving the joints good seismic performance under horizontal loads such as earthquakes, making them less prone to damage, and improving the crack resistance and seismic ductility of the structure.

[0016] The connection method of each component of the node is simple and reliable, and the layout design of the steel bars and prestressed steel strands is reasonable, which facilitates the positioning, installation and concrete pouring during the construction process, effectively shortens the construction cycle, reduces construction costs, and makes construction convenient and efficient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the concrete beam in this utility model; Figure 3 This is a schematic diagram of the structural installation of the beam end connector and fastener of this utility model; Figure 4 This is a structural diagram showing the location of the concrete beams and floor slabs in this utility model.

[0018] In the diagram: 1. Steel column main body; 2. Concrete beam; 3. Floor slab; 4. Longitudinal reinforcement of beam; 5. Slow-bonded prestressed steel strand; 6. Beam steel strand; 7. Floor slab steel strand; 8. Node connection plate; 9. Beam end connector; 10. Fastener; 11. Stirrup. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1 to 4As shown, this utility model provides a connection node for a steel-concrete composite column structure, including a steel column body 1, a concrete beam 2, a floor slab 3, longitudinal reinforcement bars 4, and loosely bonded prestressed steel strands 5. The concrete beam 2 is horizontally fixed to the side wall of the steel column body 1, and the floor slab 3 is cast on the top of the concrete beam 2 and fits against the side wall of the steel column body 1, ensuring that the floor slab, beam, and column form an integral load-bearing system. The longitudinal reinforcement bars 4 are arranged along the length of the concrete beam 2 to provide the concrete beam with bending and shear bearing capacity. The loosely bonded prestressed steel strands 5 include beam steel strands 6 and floor steel strands 7. The beam steel strands 6 are arranged along the length of the concrete beam 2 and are arranged within the concrete beam 2, while the floor steel strands 7 are arranged along the length of the floor slab 3 and are arranged within the floor slab 3. Both the beam steel strands 6 and the floor steel strands 7 avoid the arrangement area of ​​the longitudinal reinforcement bars 4 and pass through the connection node between the steel column body 1 and the concrete beam 2, realizing the smooth transfer of prestress in the node area.

[0021] The longitudinal reinforcement 4 of the beam is arranged in two parallel rows in the concrete beam 2. The spacing between adjacent longitudinal reinforcement 4 is not less than the diameter of the reinforcement and not less than 25mm. This arrangement not only ensures the uniformity of the reinforcement stress, but also reserves sufficient space for the arrangement of the beam steel strands 6, avoiding interference between the two.

[0022] The two rows of longitudinal reinforcement bars 4 of the beam are symmetrically distributed, and the central axis of each row of reinforcement bars is parallel to the central axis of the concrete beam 2 section, which ensures that the upper and lower flanges of the concrete beam 2 are subjected to balanced forces during bending, thereby improving the bending performance and stability of the beam.

[0023] The beam steel strand 6 is located in the interlayer gap between the longitudinal steel bars 4 of the multi-row beam. This position avoids the arrangement area of ​​the longitudinal steel bars 4 of the beam and allows the prestress to act on the core stress area of ​​the concrete beam, effectively improving the crack resistance and stiffness of the concrete beam.

[0024] A node connection plate 8 is fixedly connected to the side wall of the steel column body 1, and a beam end connector 9 is pre-embedded in the concrete beam 2. The node connection plate 8 and the beam end connector 9 are fixedly connected by fasteners 10. The rigid connection between the node connection plate 8 and the beam end connector 9 realizes reliable force transmission between the steel column body 1 and the concrete beam 2, enhances the integrity and shear resistance of the node, and facilitates positioning and fixing during construction and installation.

[0025] It should be noted that: the beam end connector 9 is an anchor plate that is snapped into the node connection plate 8. The anchor plate is welded to the longitudinal steel bars 4 in the concrete beam 2, which further improves the stability of the steel column connection node and improves the load-bearing capacity of the beam.

[0026] The concrete beam 2 is also equipped with stirrups 11, which are arranged at intervals along the length of the concrete beam 2 and are fitted outside the longitudinal reinforcement 4 of the beam. The stirrups 11 are tied and fixed to the longitudinal reinforcement 4 of the beam. The stirrups 11 can restrain the longitudinal displacement of the longitudinal reinforcement 4 of the beam, improve the integrity of the reinforcement cage, and enhance the shear bearing capacity and seismic ductility of the concrete beam 2, so as to avoid shear failure of the beam during the stress process.

[0027] When the floor slab steel strand 7 passes through the beam-column joint, it avoids the top area of ​​the longitudinal reinforcement 4 of the beam along the thickness direction of the floor slab 3, and the vertical spacing between the floor slab steel strand 7 and the longitudinal reinforcement 4 of the beam is not less than 30mm. This design effectively avoids spatial interference between the floor slab steel strand 7 and the longitudinal reinforcement 4 of the beam, ensures that the prestress can be applied evenly to the floor slab 3, and at the same time ensures the coordinated stress between the floor slab 3 and the concrete beam 2, thereby improving the overall stiffness and crack resistance of the structure.

[0028] Working principle and process: According to the design requirements, the longitudinal reinforcement 4 of the beam is arranged in two rows of symmetrical parallel arrangement, with the spacing between adjacent reinforcement bars controlled to be not less than the diameter of the reinforcement bar and not less than 25mm. The stirrups 11 are sleeved on the outside of the longitudinal reinforcement 4 of the beam and tied and fixed to form a complete reinforcement skeleton. Beam end connectors 9 are pre-embedded at the beam ends of the reinforcement skeleton to ensure that the position of the beam end connectors 9 corresponds to the node connection plate 8 on the main body of the steel column 1. Then, the prestressed steel strands 5 are laid with slow bonding. In the reinforcement skeleton of the concrete beam 2, the beam steel strands 6 are arranged in the interlayer gap between the two rows of longitudinal reinforcement 4 of the beam to ensure that they avoid the arrangement area of ​​the longitudinal reinforcement 4 of the beam. In the reinforcement mesh of the floor slab 3, along the length of the floor slab 3, Lay the floor slab steel strands 7 in the 10-degree direction. When crossing the beam-column joint, ensure that the vertical spacing between the floor slab steel strands 7 and the longitudinal reinforcement 4 of the beam is not less than 30mm to avoid interference. Hoist the completed concrete beam 2 reinforcement cage to the design position, align the beam end connector 9 with the node connection plate 8 on the main body of the steel column 1, and use fasteners 10 to fix the two together to ensure that the connection is firm and reliable. Then, install the formwork and pour the concrete. Install the formwork for the concrete beam 2 and the floor slab 3, check the quality of the reinforcement cage, prestressed steel strands and node connections. After confirming that there are no errors, pour the concrete and vibrate it to ensure that the concrete is tightly bonded to the main body of the steel column 1, the node connection plate 8, the reinforcement and the prestressed steel strands.

[0029] Prestressing application and anchoring: After the concrete strength reaches the design requirements, the prestressed steel strand 5 is tensioned to apply prestress. After tensioning is completed, anchoring is carried out to complete the construction of the entire node.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection node for a steel-concrete composite column structure, characterized in that: The structure includes a steel column body (1), a concrete beam (2), a floor slab (3), longitudinal reinforcement bars (4) of the beam, and a loosely bonded prestressed steel strand (5). The concrete beam (2) is horizontally fixed to the side wall of the steel column body (1), and the floor slab (3) is cast on the top of the concrete beam (2) and fits against the side wall of the steel column body (1). The longitudinal reinforcement bars (4) of the beam are arranged along the length of the concrete beam (2). The loosely bonded prestressed steel strand (5) includes beam body steel strand (6) and floor slab steel strand (7). The beam body steel strand (6) is arranged in the concrete beam (2) along the length of the concrete beam (2), and the floor slab steel strand (7) is arranged in the floor slab (3) along the length of the floor slab (3). The beam body steel strand (6) and the floor slab steel strand (7) both avoid the arrangement area of ​​the longitudinal reinforcement bars (4) of the beam and pass through the connection node between the steel column body (1) and the concrete beam (2).

2. The connection node of a steel-concrete composite column structure according to claim 1, characterized in that: The longitudinal reinforcement (4) of the beam is arranged in two parallel rows in the concrete beam (2), and the spacing between adjacent longitudinal reinforcement (4) of the beam is not less than the diameter of the reinforcement and not less than 25mm.

3. The connection node of a steel-concrete composite column structure according to claim 1, characterized in that: The two rows of longitudinal steel bars (4) of the beam are symmetrically distributed, and the central axis of each row of steel bars is parallel to the central axis of the concrete beam (2) section.

4. The connection node of a steel-concrete composite column structure according to claim 1, characterized in that: The beam strands (6) are located in the interlayer gaps between the longitudinal reinforcing bars (4) of the multi-row beams.

5. A connection node for a steel-concrete composite column structure according to claim 1, characterized in that: The steel column body (1) has a node connection plate (8) fixedly connected to its side wall, and the concrete beam (2) has a beam end connector (9) pre-embedded inside. The node connection plate (8) and the beam end connector (9) are fixedly connected by fasteners (10).

6. A connection node for a steel-concrete composite column structure according to claim 1, characterized in that: The concrete beam (2) is also provided with stirrups (11), which are arranged at intervals along the length of the concrete beam (2) and are sleeved on the outside of the longitudinal reinforcement (4) of the beam. The stirrups (11) are tied and fixed to the longitudinal reinforcement (4) of the beam.

7. A connection node for a steel-concrete composite column structure according to claim 1, characterized in that: When the floor slab steel strand (7) passes through the beam-column joint, it avoids the top arrangement area of ​​the longitudinal reinforcement (4) of the beam along the thickness direction of the floor slab (3), and the vertical spacing between the floor slab steel strand (7) and the longitudinal reinforcement (4) of the beam is not less than 30mm.

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