A connection structure between a beam and a steel column and its connection method

Abstract

This invention discloses a connection structure and method for beams and steel columns, relating to the field of building structure technology. It mainly includes precast steel columns and beams. The precast steel column comprises a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. Gaps exist between the upper and lower ring plates and the column body. Both the upper and lower ring plates are vertically arranged around the column body. The beam is perpendicular to and fixedly connected to the precast steel column. The beam is provided with longitudinal reinforcement, the ends of which are bent to extend into the gap between the upper ring plate and the column body. This invention can significantly reduce the workload on construction sites, improve work efficiency and quality, and has high reliability and stability.

Description

Technical Field

[0001] This invention relates to the field of building structure technology, and in particular to a connection structure and method for connecting beams and steel columns. Background Technology

[0002] Steel-concrete composite structures are a widely used structural system. Commonly used structures include concrete beams-concrete steel tubular columns and concrete beams-steel columns. The combination of concrete beams and steel columns can fully utilize the high load-bearing capacity and high ductility of steel columns, while also leveraging the advantages of concrete beam-slab systems such as good moldability and low cost. Traditional connections between concrete beams and steel columns generally fall into three categories: First, the steel column uses a connecting bracket, and the concrete beam reinforcement is welded to the bracket. This requires extensive welding work and involves numerous weld points, resulting in a large workload and difficulty in ensuring quality. Second, the steel column uses a concrete ring beam, with the concrete beam reinforcement anchored within the ring beam. This method requires bending the reinforcement into a circular shape during the ring beam manufacturing process, but the reinforcement used in ring beams is typically high-strength steel, making bending extremely difficult. Third, the steel column has openings through which the concrete beam reinforcement passes. However, this method weakens the load-bearing capacity of the steel column and the connection joint, failing to meet the requirement of strong joints and weak members. All three methods involve a large amount of on-site work, and because they require a lot of welding, anchoring, and binding processes, the quality of the project is easily affected by the construction environment and the skill level of the operators.

[0003] Patent CN202466845U discloses a mid-level node connection structure between a steel-concrete composite column and a steel-concrete composite beam, including an upper ring plate and a lower ring plate. However, both the upper and lower ring plates are set close to the steel-concrete composite column. Although the shear resistance can be guaranteed to some extent, the upper and lower ring plates are close to the steel-concrete composite column, and their ability to withstand forces parallel to the steel-concrete composite column is poor, that is, the bending resistance is poor, and the structural stability and safety cannot be guaranteed.

[0004] Therefore, there is a need for a connection structure and method between beams and steel columns that can greatly reduce the workload on the construction site, improve work efficiency and quality, and have high reliability and stability. Summary of the Invention

[0005] The purpose of this invention is to provide a connection structure and method for beams and steel columns to solve the problems existing in the prior art. This invention can greatly reduce the workload on the construction site, improve work efficiency and quality, and has high reliability and good stability.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a connection structure between a beam and a steel column, comprising:

[0008] A precast steel column includes a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. There are gaps between the upper ring plate and the lower ring plate and the column body. The upper ring plate and the lower ring plate are both vertically arranged around the column body.

[0009] The beam is perpendicular to and fixedly connected to the precast steel column. The beam is provided with longitudinal reinforcement bars, the ends of which are bent to extend into the gap between the upper ring plate and the column.

[0010] Preferably, both the upper fixing member and the lower fixing member are provided in multiples along the circumference of the column and are arranged perpendicular to the column.

[0011] Preferably, two upper ring plates are provided along the radial direction of the column, and there is a gap between the two upper ring plates;

[0012] Two lower ring plates are provided along the radial direction of the column, and there is a gap between the two lower ring plates.

[0013] Preferably, it further includes ring beam stirrups, wherein multiple ring beam stirrups are provided along the circumference of the upper ring plate, and the ring beam stirrups are used to clamp the two upper ring plates and the two lower ring plates.

[0014] Preferably, it further includes a reinforcing hoop, one end of which is fixed to the middle of the ring beam stirrup between the two upper ring plates, and the other end is fixed to the middle of the ring beam stirrup between the two lower ring plates.

[0015] Preferably, it also includes circumferential stirrups, which are used to connect multiple ring beam stirrups.

[0016] Preferably, the upper fixing member includes a shear-resistant part and a fixing part, the shear-resistant part and the fixing part are fixedly connected, the height of the shear-resistant part is greater than the height of the fixing part, and is used to fix it to the column. The smaller diameter of the two upper ring plates is fixedly disposed at the connection between the corresponding fixing part and the shear-resistant part, and the larger diameter of the two upper ring plates is fixedly disposed at the end of the corresponding fixing part away from the shear-resistant part.

[0017] The lower fixing member includes a shear-resistant part and a fixing part, which are fixedly connected. The height of the shear-resistant part is greater than the height of the fixing part, and it is used to fix it to the column. The smaller diameter of the two lower ring plates is fixedly disposed at the connection between the corresponding fixing part and the shear-resistant part, and the larger diameter of the two lower ring plates is fixedly disposed at the end of the corresponding fixing part away from the shear-resistant part.

[0018] Preferably, the beam further includes a reinforcing plate, which is horizontally arranged around the column and fixedly connected to the column. The top of the shear-resistant portion is fixedly connected to the bottom of the reinforcing plate and extends along the width direction of the reinforcing plate. The beam longitudinal reinforcement includes a top longitudinal reinforcement and a bottom longitudinal reinforcement. The end of the top longitudinal reinforcement is bent and located above the upper ring plate for extending into the gap. The bottom longitudinal reinforcement is located above the lower ring plate for extending into the gap. The beam further includes beam stirrups that clamp the top longitudinal reinforcement and the bottom longitudinal reinforcement.

[0019] A method for connecting a beam and a steel column includes the following steps:

[0020] S1. Preparation of Precast Steel Columns: Provide precast steel columns including a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. There are gaps between the upper and lower ring plates and the column body. The upper and lower ring plates are both vertically arranged around the column body. Check the integrity, dimensions, and quality of each component connection to ensure that they meet the design requirements.

[0021] S2. Beam preparation: Provide a beam with longitudinal reinforcement, including top longitudinal reinforcement and bottom longitudinal reinforcement; bend the end of the top longitudinal reinforcement to form a bent section at a preset angle, and keep the bottom longitudinal reinforcement at an appropriate length to insert into the gap between the upper ring plate and the column, and between the lower ring plate and the column; check whether the arrangement of beam longitudinal reinforcement, stirrup installation, and thickness of steel reinforcement protective layer meet the specifications.

[0022] S3. Alignment and installation of beams and precast steel columns: Use hoisting equipment to lift the beams to the corresponding positions of the precast steel columns, control the horizontality and verticality of the beams, accurately align the ends of the bent top longitudinal reinforcement with the gap between the upper ring plate and the column, and align the extended parts of the bottom longitudinal reinforcement with the gap between the lower ring plate and the column.

[0023] S4. Insertion and temporary fixing of longitudinal reinforcement: Insert the bent end of the top longitudinal reinforcement into the gap between the upper ring plate and the column, and insert the extended section of the bottom longitudinal reinforcement into the gap between the lower ring plate and the column, so that the longitudinal reinforcement of the beam and the precast steel column form a preliminary connection; use temporary support to fix the position of the beam to ensure that the beam does not shift in subsequent processes.

[0024] S5. Installation of ring beam stirrups: Install multiple ring beam stirrups along the circumference of the upper ring plate to clamp the two upper ring plates and the two lower ring plates, ensuring that the ring plates can work together when under stress and preventing local deformation.

[0025] S6. Installation of reinforcing hoops and circumferential hoops: Install reinforcing hoops, fixing one end to the middle of the ring beam hoops between the two upper ring plates and the other end to the middle of the ring beam hoops between the two lower ring plates to form a vertical reinforcement system; install circumferential hoops to connect multiple ring beam hoops to form a complete hoop network and enhance overall stability.

[0026] S7. Inspection and adjustment of connection nodes: Inspect the shear and bending performance of the connection nodes between the beam and the precast steel column, and check the installation quality of the ring beam stirrups, reinforcing stirrups and circumferential stirrups. Check for any looseness, misalignment or poor welding. Adjust or rework any problems found.

[0027] S8. Subsequent Construction and Acceptance: For sections requiring concrete pouring, pour and cure the concrete; once the concrete strength reaches the design requirements, remove the temporary supports; conduct overall structural acceptance, including indicators such as joint stiffness, beam and column verticality, reinforcement protective layer, welding quality, and overall stability, to ensure that design and specification requirements are met.

[0028] Preferably, in S2, the bending angle of the top longitudinal bar is 90° to 135°, and the elongation of the bottom longitudinal bar is greater than 20cm to ensure a reliable anchorage length.

[0029] In S5, the spacing of the ring beam stirrups is 10cm to 20cm, and a closed stirrup arrangement is adopted.

[0030] In S6, the reinforcing hoops are evenly spaced, and the connection points are connected by full welding or high-strength bolts.

[0031] In S7, node inspection employs a combination of ultrasonic testing, magnetic particle testing, or visual inspection.

[0032] In S8, the temporary supports are removed after the concrete has reached more than 75% of its design strength.

[0033] The present invention achieves the following technical effects compared to the prior art:

[0034] The precast steel column of the present invention includes a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. There are gaps between the upper ring plate and the lower ring plate and the column body. The upper ring plate and the lower ring plate are both vertically arranged around the column body. The beam is perpendicular to the precast steel column and fixedly connected. The beam is provided with longitudinal reinforcement bars. The ends of the longitudinal reinforcement bars are bent and can extend into the gap between the upper ring plate and the column body. Precast steel columns are manufactured in a standardized manner in the factory, with the dimensions and connection methods of each component precisely designed. On the construction site, installation and fixation are achieved simply by bending the ends of the longitudinal reinforcement bars of the beam and inserting them directly into the gap between the upper ring plate and the column, eliminating the need for complex on-site welding or bolt connections. This greatly simplifies the construction process and improves efficiency. Moreover, since most components are prefabricated in the factory, quality can be effectively monitored during production. Compared to on-site fabrication, precast components offer more stable and reliable quality, reducing quality issues caused by the construction environment and human factors, thus ensuring the overall structural quality. The upper and lower fixing components extend a certain length relative to the column to secure the upper and lower ring plates, ensuring not only the shear strength of the beam-column connection but also reliable bending strength. Therefore, this design significantly reduces on-site workload, improves work efficiency and quality, and offers high reliability and stability.

[0035] The beam-to-column connection method described in this invention, through standardized preparation of precast steel columns and beams, especially the pre-bending design of the ends of the longitudinal reinforcement bars in the beams, enables rapid alignment and installation of the beams and steel columns on-site, reducing the large number of welding, anchoring, or complex connection procedures in traditional construction. Temporary supports fix the beam position, reducing human error and repeated adjustments during construction, significantly improving installation efficiency. Simultaneously, since most connectors are prefabricated in the factory, on-site operation relies more on assembly than on-site processing, making it easier to standardize and control the project quality, avoiding quality instability caused by fluctuations in the construction environment and personnel skill levels. In the installation phase, this invention employs a multi-level reinforcement method using ring beam stirrups, reinforcing stirrups, and circumferential stirrups, creating multi-directional synergy between the upper and lower ring plates, longitudinal reinforcement bars, and steel columns, effectively distributing and transferring loads in all directions. Ring beam stirrups improve the shear strength of the joints, reinforcing stirrups provide direct vertical ties, and circumferential stirrups enhance the torsional stiffness of the overall frame. This multi-layered, multi-directional reinforcement system significantly improves the overall stability, bending resistance, and seismic resistance of the connection nodes, reduces the risk of premature failure due to localized stress concentration, and enhances the durability and safety of the beam-column system under complex loads. In this method, the node inspection and adjustment procedures are strictly defined, including the use of non-destructive testing technologies such as ultrasonic and magnetic particle testing for quality acceptance, ensuring that there are no welding defects, misalignments, or loosening at each connection, thus reducing potential hazards. Simultaneously, by clearly defining the strength conditions for concrete pouring and temporary support removal, the overall load-bearing capacity of the connection nodes after concrete curing is guaranteed. After the overall construction is completed, the structural nodes have a longer service life and stronger fatigue resistance, reducing maintenance frequency and costs in the subsequent operation phase. The overall solution improves construction convenience while achieving higher long-term reliability. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a perspective view of the connection structure between the beam and the steel column in an embodiment of the present invention;

[0038] Figure 2 This is a cross-sectional view of the connection structure between the beam and the steel column in an embodiment of the present invention.

[0039] In the diagram: 101-Precast steel column; 102-Beam; 1-Upper ring plate; 2-Lower ring plate; 3-Upper fixing component; 4-Lower fixing component; 41-Shear-resistant part; 42-Fixing part; 5-Reinforcing plate; 6-Ring beam stirrups; 7-Top longitudinal reinforcement; 8-Bottom longitudinal reinforcement; 9-Reinforcing stirrups; 10-Circumferential stirrups. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The purpose of this invention is to provide a connection structure and method for beams and steel columns to solve the problems existing in the prior art. It can greatly reduce the workload on the construction site, improve work efficiency and quality, and has high reliability and good stability.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] like Figures 1-2As shown, the present invention provides a connection structure between a beam and a steel column, including a precast steel column 101 and a beam 102. The precast steel column 101 includes a column body, an upper ring plate 1, a lower ring plate 2, an upper fixing member 3, and a lower fixing member 4. One end of the upper fixing member 3 is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate 1. One end of the lower fixing member 4 is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate 2. There are gaps between the upper ring plate 1 and the lower ring plate 2 and the column body. The upper ring plate 1 and the lower ring plate 2 are both vertically arranged around the column body. The beam 102 is perpendicular to and fixedly connected to the precast steel column 101. The beam 102 is provided with longitudinal reinforcement bars, and the ends of the longitudinal reinforcement bars are bent to extend into the gap between the upper ring plate 1 and the column body. The precast steel column 101 is manufactured in a standardized manner in the factory. The dimensions and connection methods of each component are precisely designed. On the construction site, the ends of the longitudinal reinforcement bars of the beam are simply bent and inserted directly into the gap between the upper ring plate 1 and the column for installation and fixation. This eliminates the need for complex on-site welding or bolting, greatly simplifying the construction process and improving efficiency. Furthermore, since most components are prefabricated in the factory, quality can be effectively monitored during production. Compared to on-site fabrication, precast components offer more stable and reliable quality, reducing quality issues caused by the construction environment and human factors, thus ensuring the overall structural quality. The upper fixing member 3 and the lower fixing member 4 extend a certain length relative to the column to fix the upper ring plate 1 and the lower ring plate 2, ensuring not only the shear strength of the beam-column connection node but also reliable bending strength. Therefore, this design significantly reduces on-site workload, improves work efficiency and quality, and offers high reliability and stability.

[0044] In some embodiments, multiple upper fixing members 3 and lower fixing members 4 are arranged circumferentially around the column and perpendicular to the column. The multiple fixing members increase the number of connection points between the upper ring plate 1, lower ring plate 2, and the column, making the connections between the various components of the precast steel column 101 tighter and stronger, thus enhancing the overall integrity of the precast steel column 101 structure. It also allows the forces from the beams on the upper ring plate 1 and lower ring plate 2 to be evenly transmitted to the column, avoiding stress concentration in localized areas and ensuring more uniform stress distribution throughout the column. This improves the structure's load-bearing capacity and stability. In complex stress environments, such as the multidimensional forces generated during earthquakes, these circumferentially evenly arranged fixing members allow the precast steel column 101 to cooperate in bearing forces from multiple angles, better coping with forces in different directions and reducing the risk of structural damage due to excessive local stress.

[0045] It should be noted that the upper fixing member 3 and the lower fixing member 4 can each be provided as a single unit, which can be set as a ring plate to fix the upper ring plate 1 and the lower ring plate 2 to the column.

[0046] In some embodiments, two upper ring plates 1 are arranged radially along the column, with a gap between the two upper ring plates 1; two lower ring plates 2 are arranged radially along the column, with a gap between the two lower ring plates 2. The gap between the two ring plates can play a certain buffering role, enabling the structure to maintain good load-bearing capacity under different stress stages. The area of ​​the upper ring plate 1 and the lower ring plate 2 can be determined by the following formula:

[0047] ;

[0048] ;

[0049] ;

[0050] ;

[0051] In the formula: H and t represent the area, height, and thickness of the upper and lower ring plates, respectively.

[0052] —The bending moments at both ends of the frame beam calculated from the actual reinforcement configuration of the concrete beam;

[0053] —Design values ​​for the tensile strength of the upper and lower ring plates;

[0054] —The lever arm from the point of application of the resultant force of the upper and lower ring plates under tension to the point of application of the resultant force in the compression zone is taken as ;

[0055] —Height of the ring beam section;

[0056] —Effective height of the ring beam section;

[0057] —The shear ring ratio, which is the ratio of the nominal tensile force of the stirrups in the ring beam to the nominal tensile force of the upper and lower ring plates of the ring beam, can be taken as 0.35~0.7;

[0058] —Relative diameter of the steel pipe;

[0059] —Round beam radius: Radial distance from the edge of the ring beam to the center of the steel pipe;

[0060] —Width of the frame beam connected to the ring beam;

[0061] —The angle formed between the longitudinal reinforcement of the beam and the column when inserted into the upper ring plate reflects the inclination angle of the longitudinal reinforcement after bending into the ring joint. It is generally determined according to the spatial relationship between the beam and the column, and the value range is 20°~45°.

[0062] , : These represent the angles formed between the upper and lower ring plate sections and the beam centerline when arranged circumferentially. The eccentricity angle of the upper ring plate, The eccentricity angle of the lower ring plate, together with the eccentricity angle, determines the range of the constraint force exerted by the ring plate on the longitudinal reinforcement.

[0063] In some embodiments, the connection structure between the beam and the steel column further includes ring beam stirrups 6. Multiple ring beam stirrups 6 are arranged circumferentially along the upper ring plate 1, and are used to clamp the two upper ring plates 1 and the two lower ring plates 2. The ring beam stirrups 6 mainly bear the shear force transmitted from the beam. Multiple ring beam stirrups 6 are arranged circumferentially along the upper ring plate 1 and clamp the upper ring plate 1 and the lower ring plate 2, tightly connecting the two upper ring plates 1 and the two lower ring plates 2 together. This allows the ring plates to work collaboratively under stress, preventing local deformation or displacement of a single ring plate, thereby enhancing the integrity and stability of the ring plate structure. The cross-sectional area of ​​a single-limb ring beam stirrup 6 can be determined by the following formula:

[0064] ;

[0065] ;

[0066] In the formula: —Area of ​​a single leg of the ring beam stirrups;

[0067] —Design value of tensile strength of stirrups;

[0068] — Width of the ring beam;

[0069] —Number of closed hoops;

[0070] —Angle between stirrups (radians);

[0071] S— Spacing of stirrups along the centerline of the ring beam;

[0072] : This is the stirrup configuration coefficient, used to correct the actual stress efficiency of stirrups under different structural arrangements. The value range is 0.65~0.85. In this embodiment, the recommended value of 0.7 is included according to the structural design code.

[0073] f: The design value of the shear force transmitted from the longitudinal reinforcement to the stirrups in the concrete beam, in N;

[0074] In some embodiments, the connection structure between the beam and the steel column further includes a reinforcing hoop 9. One end of the reinforcing hoop 9 is fixed to the middle of the ring beam stirrup 6 between the two upper ring plates 1, and the other end is fixed to the middle of the ring beam stirrup 6 between the two lower ring plates 2. The reinforcing hoop 9 connects the middle of the ring beam stirrup 6 between the upper ring plate 1 and the lower ring plate 2, forming a direct tension member in the vertical direction. This effectively resists vertical tensile and compressive forces, preventing relative displacement between the upper ring plate 1 and the lower ring plate 2 under vertical loads, thereby improving the vertical stability of the entire connection structure. When the structure is subjected to horizontal or torsional forces, the reinforcing hoop 9 can limit the slippage between the upper ring plate 1 and the lower ring plate 2, enhancing the structure's shear resistance in the horizontal direction. Furthermore, by more effectively transferring and dispersing the force between the upper ring plate 1 and the lower ring plate 2, it reduces the risk of local shear failure and improves the overall seismic performance of the structure. The reinforcing hoop 9 alters the force transmission path within the structure, allowing a portion of the force to be transferred from the beam to the upper ring plate 1 and then directly to the lower ring plate 2 via the reinforcing hoop 9. This avoids the force relying entirely on the indirect transmission through the ring beam stirrups 6, helping to optimize the internal force distribution and making the stress distribution of each part of the structure more rational. Without the reinforcing hoop 9, local stress concentration may occur at the connection points between the upper ring plate 1 and the lower ring plate 2 and the ring beam stirrups 6, which can easily lead to fatigue failure under long-term stress. The presence of the reinforcing hoop 9 can distribute some of the force, reducing the stress concentration at the connection points, thereby improving the durability and service life of the structure.

[0075] In some embodiments, the connection structure between the beam and the steel column further includes circumferential stirrups 10, which are used to connect multiple ring beam stirrups 6. The circumferential stirrups 10 connect multiple ring beam stirrups 6 to form a denser stirrup network, making the stirrup system of the entire connection structure more complete and stable, and enhancing the overall performance of the structure.

[0076] In some embodiments, the upper fixing member 3 includes a shear-resistant portion 41 and a fixing portion 42, which are fixedly connected. The height of the shear-resistant portion 41 is greater than the height of the fixing portion 42, and it is used for fixed connection with the column. The smaller diameter of the two upper ring plates 1 is fixedly disposed at the connection between the corresponding fixing portion 42 and the shear-resistant portion 41, and the larger diameter of the two upper ring plates 1 is fixedly disposed at the end of the corresponding fixing portion 42 away from the shear-resistant portion 41. The lower fixing member 4 includes a shear-resistant portion 41 and a fixing portion 42, which are fixedly connected. The height of the shear-resistant portion 41 is greater than the height of the fixing portion 42, and it is used for fixed connection with the column. The smaller diameter of the two lower ring plates 2 is fixedly disposed at the connection between the corresponding fixing portion 42 and the shear-resistant portion 41, and the larger diameter of the two lower ring plates 2 is fixedly disposed at the end of the corresponding fixing portion 42 away from the shear-resistant portion 41. The height of the shear-resistant part 41 is greater than the height of the fixed part 42. When the structure is subjected to shear force, the larger shear-resistant part 41 can provide a larger shear-resistant area and stronger shear stiffness. When external force attempts to cause relative shear motion between the beam and the column, the shear-resistant part 41 can effectively resist this shear force, improve the shear resistance of the connected structure, and reduce the risk of structural failure due to shear failure.

[0077] In some embodiments, the connection structure between the beam and the steel column further includes a reinforcing plate 5, which is horizontally arranged around the column and fixedly connected to the column. The top of the shear-resistant portion 41 is fixedly connected to the bottom of the reinforcing plate 5 and extends along the width direction of the reinforcing plate 5. The top of the shear-resistant portion 41 is connected to the reinforcing plate 5, and when the structure is subjected to shear force, the reinforcing plate 5 can provide additional support for the shear-resistant portion 41. Through this connection method, shear force can be more effectively transferred from the shear-resistant portion 41 to the reinforcing plate 5, and then the reinforcing plate 5 distributes the force to the column, which can improve the shear resistance of the entire connection structure, reduce the risk of structural failure due to shear force, and increase structural stability.

[0078] In some embodiments, the longitudinal reinforcement of the beam includes a top longitudinal reinforcement 7 and a bottom longitudinal reinforcement 8. The top longitudinal reinforcement 7 is located above the upper ring plate 1, and its end is bent to extend into the gap. The bottom longitudinal reinforcement 8 is located above the lower ring plate 2 and extends into the gap. The top longitudinal reinforcement 7 and the bottom longitudinal reinforcement 8 are located at the upper and lower parts of the beam, respectively. The end of the top longitudinal reinforcement 7 is bent and extends into the gap between the upper ring plate 1 and the column. The bottom longitudinal reinforcement 8 extends into the gap between the lower ring plate 2 and the column. When the beam is subjected to bending moment, the top longitudinal reinforcement 7 and the bottom longitudinal reinforcement 8 can work together. The top longitudinal reinforcement 7 is under tension, and the bottom longitudinal reinforcement 8 is under compression, which can effectively improve the bending resistance of the beam and enable the beam to maintain good load-bearing performance under bending load. When the beam is subjected to shear force, the longitudinal reinforcement can transfer the shear force to the entire structural system through the connection with the upper ring plate 1, the lower ring plate 2, and the column, which can avoid the failure caused by the concentration of shear force in a certain part of the beam and enhance the shear stability of the beam under complex stress conditions.

[0079] In some embodiments, beam 102 further includes beam stirrups that connect the top longitudinal reinforcement 7 and the bottom longitudinal reinforcement 8. The beam stirrups can maintain the position of the top longitudinal reinforcement 7 and the bottom longitudinal reinforcement 8, and can improve the flexural and shear bearing capacity.

[0080] A method for connecting a beam and a steel column includes the following steps:

[0081] S1. Preparation of Precast Steel Columns: Provide precast steel columns including a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. There are gaps between the upper and lower ring plates and the column body. The upper and lower ring plates are both vertically arranged around the column body. Check the integrity, dimensions, and quality of each component connection to ensure that they meet the design requirements.

[0082] S2. Beam preparation: Provide a beam with longitudinal reinforcement, including top longitudinal reinforcement and bottom longitudinal reinforcement; bend the end of the top longitudinal reinforcement to form a bent section at a preset angle, and keep the bottom longitudinal reinforcement at an appropriate length to insert into the gap between the upper ring plate and the column, and between the lower ring plate and the column; check whether the arrangement of beam longitudinal reinforcement, stirrup installation, and thickness of steel reinforcement protective layer meet the specifications.

[0083] S3. Alignment and installation of beams and precast steel columns: Use hoisting equipment to lift the beams to the corresponding positions of the precast steel columns, control the horizontality and verticality of the beams, accurately align the ends of the bent top longitudinal reinforcement with the gap between the upper ring plate and the column, and align the extended parts of the bottom longitudinal reinforcement with the gap between the lower ring plate and the column.

[0084] S4. Insertion and temporary fixing of longitudinal reinforcement: Insert the bent end of the top longitudinal reinforcement into the gap between the upper ring plate and the column, and insert the extended section of the bottom longitudinal reinforcement into the gap between the lower ring plate and the column, so that the longitudinal reinforcement of the beam and the precast steel column form a preliminary connection; use temporary support to fix the position of the beam to ensure that the beam does not shift in subsequent processes.

[0085] S5. Installation of ring beam stirrups: Install multiple ring beam stirrups along the circumference of the upper ring plate to clamp the two upper ring plates and the two lower ring plates, ensuring that the ring plates can work together when under stress and preventing local deformation.

[0086] S6. Installation of reinforcing hoops and circumferential hoops: Install reinforcing hoops, fixing one end to the middle of the ring beam hoops between the two upper ring plates and the other end to the middle of the ring beam hoops between the two lower ring plates to form a vertical reinforcement system; install circumferential hoops to connect multiple ring beam hoops to form a complete hoop network and enhance overall stability.

[0087] S7. Inspection and adjustment of connection nodes: Inspect the shear and bending performance of the connection nodes between the beam and the precast steel column, and check the installation quality of the ring beam stirrups, reinforcing stirrups and circumferential stirrups. Check for any looseness, misalignment or poor welding. Adjust or rework any problems found.

[0088] S8. Subsequent Construction and Acceptance: For sections requiring concrete pouring, pour and cure the concrete; once the concrete strength reaches the design requirements, remove the temporary supports; conduct overall structural acceptance, including indicators such as joint stiffness, beam and column verticality, reinforcement protective layer, welding quality, and overall stability, to ensure that design and specification requirements are met.

[0089] In S2, the bending angle of the top longitudinal reinforcement is 90° to 135°, and the elongation of the bottom longitudinal reinforcement is greater than 20cm to ensure reliable anchorage length.

[0090] In S5, the spacing of the ring beam stirrups is 10cm to 20cm, and a closed stirrup arrangement is adopted.

[0091] In S6, the reinforcing hoops are evenly distributed, and the connection points are connected by full welding or high-strength bolts.

[0092] In S7, node inspection is carried out by a combination of ultrasonic testing, magnetic particle testing, or visual inspection.

[0093] In S8, the temporary supports are removed after the concrete has reached more than 75% of its design strength.

[0094] The beam-to-column connection method described in this invention, through standardized preparation of precast steel columns and beams, especially the pre-bending design of the ends of the longitudinal reinforcement bars in the beams, enables rapid alignment and installation of the beams and steel columns on-site, reducing the large number of welding, anchoring, or complex connection procedures in traditional construction. Temporary supports fix the beam position, reducing human error and repeated adjustments during construction, significantly improving installation efficiency. Simultaneously, since most connectors are prefabricated in the factory, on-site operation relies more on assembly than on-site processing, making it easier to standardize and control the project quality, avoiding quality instability caused by fluctuations in the construction environment and personnel skill levels. In the installation phase, this invention employs a multi-level reinforcement method using ring beam stirrups, reinforcing stirrups, and circumferential stirrups, creating multi-directional synergy between the upper and lower ring plates, longitudinal reinforcement bars, and steel columns, effectively distributing and transferring loads in all directions. Ring beam stirrups improve the shear strength of the joints, reinforcing stirrups provide direct vertical ties, and circumferential stirrups enhance the torsional stiffness of the overall frame. This multi-layered, multi-directional reinforcement system significantly improves the overall stability, bending resistance, and seismic resistance of the connection nodes, reduces the risk of premature failure due to localized stress concentration, and enhances the durability and safety of the beam-column system under complex loads. In this method, the node inspection and adjustment procedures are strictly defined, including the use of non-destructive testing technologies such as ultrasonic and magnetic particle testing for quality acceptance, ensuring that there are no welding defects, misalignments, or loosening at each connection, thus reducing potential hazards. Simultaneously, by clearly defining the strength conditions for concrete pouring and temporary support removal, the overall load-bearing capacity of the connection nodes after concrete curing is guaranteed. After the overall construction is completed, the structural nodes have a longer service life and stronger fatigue resistance, reducing maintenance frequency and costs in the subsequent operation phase. The overall solution improves construction convenience while achieving higher long-term reliability.

[0095] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A connection structure between a beam and a steel column, characterized in that: include A precast steel column includes a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. The upper ring plate and the lower ring plate are both vertically arranged around the column body, and there are gaps between the upper ring plate and the column body. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. The beam is perpendicular to and fixedly connected to the precast steel column. The beam is provided with longitudinal reinforcement along its length, and the ends of the longitudinal reinforcement are bent to extend into the gap between the upper ring plate and the column. Two upper ring plates are provided along the radial direction of the column, and there is a gap between the two upper ring plates; Two lower ring plates are provided along the radial direction of the column, and there is a gap between the two lower ring plates; It also includes ring beam stirrups, wherein multiple ring beam stirrups are provided along the circumference of the upper ring plate, and the ring beam stirrups are used to fasten the two upper ring plates and the two lower ring plates; The upper fixing member includes a shear-resistant part and a fixing part, which are fixedly connected. The height of the shear-resistant part is greater than the height of the fixing part, and it is used to fix it to the column. The smaller diameter of the two upper ring plates is fixedly disposed at the connection between the corresponding fixing part and the shear-resistant part, and the larger diameter of the two upper ring plates is fixedly disposed at the end of the corresponding fixing part away from the shear-resistant part. The lower fixing member includes a shear-resistant part and a fixing part, which are fixedly connected. The height of the shear-resistant part is greater than the height of the fixing part, and it is used to fix it to the column. The smaller diameter of the two lower ring plates is fixedly disposed at the connection between the corresponding fixing part and the shear-resistant part, and the larger diameter of the two lower ring plates is fixedly disposed at the end of the corresponding fixing part away from the shear-resistant part.

2. The beam-steel column connection structure according to claim 1, characterized in that: Both the upper and lower fixing members are provided in multiples along the circumference of the column and are arranged perpendicular to the column.

3. The beam-steel column connection structure according to claim 1, characterized in that: It also includes a reinforcing hoop, one end of which is fixed to the middle of the ring beam stirrup between the two upper ring plates, and the other end is fixed to the middle of the ring beam stirrup between the two lower ring plates.

4. The beam-steel column connection structure according to claim 1, characterized in that: It also includes circumferential stirrups, which are used to connect multiple ring beam stirrups.

5. The beam-steel column connection structure according to claim 1, characterized in that: It also includes a reinforcing plate, which is horizontally arranged around the column and fixedly connected to the column. The top of the shear-resistant portion is fixedly connected to the bottom of the reinforcing plate and extends along the width direction of the reinforcing plate. The beam longitudinal reinforcement includes a top longitudinal reinforcement and a bottom longitudinal reinforcement. The end of the top longitudinal reinforcement is bent and located above the upper ring plate for extending into the gap. The bottom longitudinal reinforcement is located above the lower ring plate for extending into the gap. The beam also includes beam stirrups, which clamp the top longitudinal reinforcement and the bottom longitudinal reinforcement.

6. A method for connecting a beam and a steel column, applicable to the beam and steel column connection structure described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Preparation of Precast Steel Columns: Provide precast steel columns including a column body, an upper ring plate, a lower ring plate, an upper fixing member, and a lower fixing member. One end of the upper fixing member is fixedly connected to the column body, and the other end is fixedly connected to the upper ring plate. One end of the lower fixing member is fixedly connected to the column body, and the other end is fixedly connected to the lower ring plate. There are gaps between the upper and lower ring plates and the column body. The upper and lower ring plates are both vertically arranged around the column body. Check the integrity, dimensions, and quality of each component connection to ensure that they meet the design requirements. S2. Beam preparation: Provide a beam with longitudinal reinforcement, including top longitudinal reinforcement and bottom longitudinal reinforcement; bend the end of the top longitudinal reinforcement to form a bent section at a preset angle, and keep the bottom longitudinal reinforcement at an appropriate length to insert into the gap between the upper ring plate and the column, and between the lower ring plate and the column; check whether the arrangement of the beam longitudinal reinforcement, the installation of the stirrups, and the thickness of the concrete cover meet the specifications. S3. Alignment and installation of beams and precast steel columns: Use hoisting equipment to lift the beams to the corresponding positions of the precast steel columns, control the horizontality and verticality of the beams, accurately align the ends of the bent top longitudinal reinforcement with the gap between the upper ring plate and the column, and align the extended parts of the bottom longitudinal reinforcement with the gap between the lower ring plate and the column. S4. Insertion and temporary fixing of longitudinal reinforcement: Insert the bent end of the top longitudinal reinforcement into the gap between the upper ring plate and the column, and insert the extended section of the bottom longitudinal reinforcement into the gap between the lower ring plate and the column, so that the longitudinal reinforcement of the beam and the precast steel column form a preliminary connection; use temporary support to fix the position of the beam to ensure that the beam does not shift in subsequent processes. S5. Installation of ring beam stirrups: Install multiple ring beam stirrups along the circumference of the upper ring plate to clamp the two upper ring plates and the two lower ring plates, ensuring that the ring plates can work together when under stress and preventing local deformation. S6. Installation of reinforcing hoops and circumferential hoops: Install reinforcing hoops, fixing one end to the middle of the ring beam hoops between the two upper ring plates and the other end to the middle of the ring beam hoops between the two lower ring plates to form a vertical reinforcement system; install circumferential hoops to connect multiple ring beam hoops to form a complete hoop network and enhance overall stability. S7. Inspection and adjustment of connection nodes: Inspect the shear and bending performance of the connection nodes between the beam and the precast steel column, and check the installation quality of the ring beam stirrups, reinforcing stirrups and circumferential stirrups. Check for any looseness, misalignment or poor welding. Adjust or rework any problems found. S8. Subsequent Construction and Acceptance: For sections requiring concrete pouring, pour and cure the concrete; once the concrete strength reaches the design requirements, remove the temporary supports; conduct overall structural acceptance, including joint stiffness, beam and column verticality, reinforcement protective layer, welding quality, and overall stability indicators, to ensure that design and specification requirements are met.

7. The method for connecting a beam and a steel column according to claim 6, characterized in that: In S2, the bending angle of the top longitudinal bar is 90° to 135°, and the elongation of the bottom longitudinal bar is greater than 20cm to ensure a reliable anchorage length. In S5, the spacing of the ring beam stirrups is 10cm to 20cm, and a closed stirrup arrangement is adopted. In S6, the reinforcing hoops are evenly spaced, and the connection points are connected by full welding or high-strength bolts. In S7, node inspection employs a combination of ultrasonic testing, magnetic particle testing, or visual inspection. In S8, the temporary supports are removed after the concrete has reached more than 75% of its design strength.

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