Concrete beam column connecting structure

Abstract

The utility model belongs to the technical field of building structures, and particularly relates to a concrete beam column connecting structure suitable for connecting a newly-added interlayer concrete beam and an existing concrete column. The concrete column is connected with the concrete beam through the annular beam, the annular beam comprises annular rib units arranged at intervals in the axial direction of the outer surface of the concrete column, each annular rib unit is composed of at least two annular ribs concentrically arranged on the periphery of the concrete column at intervals, and the stirrups are distributed at intervals in the radial direction of the annular ribs and fixed to the annular ribs through an annular beam concrete structure. The concrete column is anchored with the annular beam concrete structure through shear-resistant studs which are arranged on the surface of the concrete column at intervals in the axial direction, the concrete beam comprises a longitudinal bar and a concrete structure arranged outside the longitudinal bar, and the inner end of the longitudinal bar is anchored with the annular beam concrete structure in a hinged mode. The concrete column effectively solves the problems of difficult construction, weak bearing capacity of the concrete column, poor anti-seismic effect and the like in the prior art, and has the advantages of convenience in construction, strong bearing capacity of the concrete column, good anti-seismic effect and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of building structures, and particularly relates to a concrete beam-column connection structure applicable to the connection between a newly added concrete beam of a mezzanine and an existing concrete column. Background Technique

[0002] Necessary renovation and strengthening of existing buildings can not only save investment and resources, but also reduce land acquisition, which is of great significance for alleviating the increasingly tense urban land use contradiction. Adding a mezzanine inside an existing building is a very effective way to increase the effective usable area. Considering different usage functions and the size of the added mezzanine area, choosing to add a concrete structure mezzanine can effectively reduce the impact on the existing structure caused by choosing other structural forms.

[0003] The connection of beam-column joints is a seismic weak area. In renovation projects, the connection between a newly added concrete beam and an existing concrete column often occurs, resulting in problems such as insufficient shear bearing capacity of the beam-column connection joints, and appropriate reinforcement measures should be taken. Most of the existing technologies are to implant the longitudinal reinforcement of the beam into the existing concrete column by the way of post-inserted bars, or the longitudinal reinforcement of the beam directly penetrates the concrete column. The existing technology has the following deficiencies: First, the construction is difficult. The number of post-inserted bar drill holes is large, the drilling depth is deep, and the drill holes need to avoid the steel bars of the existing concrete column; second, the post-inserted bar drill holes damage the existing concrete column too much and weaken the bearing capacity of the column itself; third, there is no reinforcement effect on the newly formed beam-column joints, and there are potential safety hazards.

[0004] The current "Code for Seismic Design of Buildings" improves the seismic bearing capacity of frame columns greatly by adjusting the moment and shear force amplification coefficients at the column ends of frame structures, in order to achieve the seismic fortification purpose of "strong columns and weak beams". However, for the actually constructed frame structure buildings, due to the existence of floor slabs and infill walls, etc., the enhancement effect on the stiffness and flexural bearing capacity of frame beams does not achieve the expected seismic effect, but instead shows the failure characteristics of "strong beams and weak columns". Summary of the Invention

[0005] The purpose of the utility model is to provide a concrete beam-column connection structure, which can effectively reduce the damage to the existing concrete column, effectively improve the shear and flexural bearing capacity of the joint by increasing the connection area of the beam-column joint, and at the same time improve the seismic performance by optimizing the structure of the beam-column joint.

[0006] The overall technical concept of the utility model is:

[0007] Concrete beam-column connection structure, including a concrete column and a concrete beam connected thereto; the concrete column is connected to the concrete beam through a ring beam, and the ring beam includes ring reinforcement units axially spaced along the outer surface of the concrete column. Each ring reinforcement unit is composed of at least two concentrically spaced rings of reinforcement arranged around the outer periphery of the concrete column. Stirrups are radially spaced along the ring reinforcement and fixed thereto through the ring beam concrete structure. Shear studs are axially spaced and planted on the side surface of the concrete column. The concrete column is anchored to the ring beam concrete structure through the shear studs planted on its surface. The concrete beam includes longitudinal reinforcement and a concrete structure arranged outside thereof. The inner end of the longitudinal reinforcement is anchored to the ring beam concrete structure in a hinged manner.

[0008] The applicant needs to explain that:

[0009] A plastic hinge is a connection member that can undergo plastic deformation when subjected to external forces. It can enable the entire structure to undergo plastic deformation when affected by natural disasters such as earthquakes, thereby playing a role in absorbing energy. At the same time, it can also protect the building structure and reduce the damage degree of natural disasters such as earthquakes to the building.

[0010] The purpose of anchoring the inner end of the longitudinal reinforcement to the ring beam concrete structure in a hinged manner is to form a plastic hinge between the beam and the column through the hinged connection, which can rotate or deform relatively to a certain extent to meet the deformation requirements of the structure under load. The plastic hinge can reduce the stress concentration caused by the structural deformation, thereby improving the performance and durability of the structure. The plastic hinge can reduce the rigid connection between the beam and the column, thereby helping to reduce the stress and deformation of the structure and improve the seismic performance and load-bearing capacity of the structure. It can also improve the maintainability and replaceability of the structure.

[0011] The specific technical concept of the present utility model also includes:

[0012] The adjacent surface of the concrete column and the ring beam is a rough surface.

[0013] To facilitate the positioning of the stirrups and the ring reinforcement to meet the construction requirements, the preferred technical implementation means is that the stirrups adopt a rectangular structure wound around the outside of the ring reinforcement and adapted thereto. In this way, the relative fixation of their positions can be conveniently achieved through tying after lapping.

[0014] The function of the shear studs is to bear the shear force. To meet the need of anti-shear performance while ensuring the strength, reduce the damage to the concrete column under the premise of meeting the standards and specifications, and at the same time ensure a reliable anchoring effect on the concrete structure, the preferred technical implementation means is that the diameter d of the shear studs ≥ 16mm. The shear studs are planted on each side surface of the concrete column in not less than two rows, the axial distance of each row of shear studs ≤ 200mm, the exposed length of the outer end of the shear studs ≥ 4d, and the planting depth of the shear studs on the concrete column ≥ 10d.

[0015] To improve the connection strength between the ring beam concrete structure and the concrete column, the preferred technical implementation method is that the ring beam concrete structure is formed by pouring concrete with a strength grade higher than that of the concrete column. A more preferred technical implementation means is that the ring beam concrete structure is formed by pouring concrete with a strength grade one level higher than that of the concrete column.

[0016] On the premise of meeting the requirements of standards and specifications, to improve the structural strength of the ring beam, the preferred technical implementation method is that the spacing between axially adjacent ring reinforcement units ≤ 200 mm, and the spacing between radially adjacent ring reinforcements 2A in each ring reinforcement unit ≤ 100 mm.

[0017] To facilitate the anchoring of the inner end to the ring beam concrete structure in a hinged manner, the preferred technical implementation means is that the longitudinal reinforcement is arranged radially along the concrete column and is axially spaced, and the inner end of the longitudinal reinforcement is provided with a bending part.

[0018] The applicant needs to explain that:

[0019] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "axial direction", "radial direction", "surface", "side surface", "external" is based on the orientation or positional relationship shown in the drawings. It is only for facilitating the simplified description of the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be construed as a limitation to the present utility model.

[0020] The present utility model is made as follows:

[0021] 1. According to the renovation construction drawings, determine the construction position where the concrete beam needs to be connected to the concrete column;

[0022] 2. Determine the cross-sectional dimensions of the ring beam. For the determination of the inner diameter of the ring beam: the long side length of the diagonal of the cross-section of the concrete column is used as the minimum inner diameter; for the determination of the outer diameter of the ring beam: the sum of the long side length of the diagonal of the cross-section of the concrete column and the beam width is used as the outer diameter, and the beam width should not be less than 200 mm; for the determination of the height of the ring beam: it is increased by not less than 50 mm compared with the beam height of the concrete beam;

[0023] 3. According to the connection structure requirements, roughen the outer surface of the concrete column in the connection area and clean the surface;

[0024] 4. Install shear studs on the surface of the concrete column;

[0025] 5. Conduct on-site lofting and process the ring reinforcement and stirrups according to the on-site dimension requirements;

[0026] 6. Support the formwork and support the formwork according to the connection joint structure;

[0027] 7. Bind the steel bars and bind and fix the ring reinforcement and stirrups on-site;

[0028] 8. Anchor the longitudinal bars into the ring beam according to the connection structure requirements of hinged joints.

[0029] 9. Pour concrete, using concrete with a strength grade higher than that of the concrete column for pouring.

[0030] 10. Cure according to the requirements of the construction specifications. After reaching the design strength, remove the formwork.

[0031] 11. The renovation of the structural part is completed.

[0032] The technical progress achieved by the present utility model lies in:

[0033] 1. In the present utility model, the longitudinal bars of the concrete beam do not need to be implanted into the concrete column. Only shear studs need to be planted on the surface of the concrete column. First, it reduces the damage to the concrete column caused by the implantation of steel bars, improving the bearing capacity of the concrete column. Second, the construction process is simple and convenient, only requiring construction according to the traditional construction process, without the need to avoid the existing concrete column steel bars. Third, the shear studs effectively improve the shear resistance performance and connection reliability of the connection part between the ring beam and the concrete column, meeting the design principle of "strong shear and weak flexure" in seismic design.

[0034] 2. A ring beam is added in the connection node range, and the connection reliability is improved by increasing the connection area of the beam-column node, effectively improving the shear bearing capacity and flexural bearing capacity of the beam-column connection node.

[0035] 3. The longitudinal bars are anchored into the ring beam according to the connection structure requirements of hinged joints to form plastic hinges, which can cause plastic deformation of the overall structure when subjected to natural disasters such as earthquakes, guiding the frame structure or frame-shear wall structure to form a beam hinge mechanism under earthquake action, that is, controlling the beam end with a large plastic deformation capacity to appear plastic hinges prior to the column, meeting the design principle of "strong column and weak beam" in seismic design.

[0036] 4. The present utility model connects the concrete column and beam through the ring beam. Without changing the existing building structure system, a "hoop" is formed at the connection position, enhancing the connection strength between the concrete beam and column, facilitating the connection between the concrete beam and column, and meeting the design principle of "strong node and weak member" in seismic design. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is the overall structural schematic diagram of the present utility model.

[0038] Figure 2 is Figure 1 the view in the A-A direction of

[0039] The reference numerals in the drawings are as follows:

[0040] 1. Concrete column; 2. Ring beam; 2A. Ring reinforcement; 2B. Stirrup; 3. Shear stud; 4. Concrete beam; 4A. Longitudinal reinforcement. Detailed implementation mode

[0041] The following further describes the present utility model in conjunction with embodiments, but it should not be construed as a limitation to the present utility model. The protection scope of the present utility model is subject to the content recorded in the claims. Any equivalent technical means substitution made according to the specification does not deviate from the protection scope of the present utility model.

[0042] The overall concept of the maintenance system in this embodiment is as shown in the figure. The concrete beam-column connection structure includes a concrete column 1 and a concrete beam 4 connected thereto; the concrete column 1 is connected to the concrete beam 4 through a ring beam 2. The ring beam 2 includes ring reinforcement units axially spaced along the outer surface of the concrete column 1. Each ring reinforcement unit is composed of two ring reinforcements 2A concentrically and spaced apart on the outer periphery of the concrete column 1. Stirrups 2B are radially and equally angularly spaced along the ring reinforcement 2A and are fixed thereto through the ring beam concrete structure. Shear studs 3 are axially spaced and planted on the side surface of the concrete column 1. The concrete column 1 is anchored to the ring beam concrete structure through the shear studs 3 planted on its surface. The concrete beam 4 includes longitudinal reinforcements 4A and a concrete structure provided outside thereof. The inner end of the longitudinal reinforcement 4A is anchored to the ring beam concrete structure in a hinged manner.

[0043] The adjacent surface of the concrete column 1 and the ring beam 2 is a rough surface.

[0044] The stirrup 2B adopts a rectangular structure wound around the outside of the ring reinforcement 2A and adapted thereto.

[0045] The diameter d of the shear stud 3 ≥ 16 mm. The shear studs 3 are planted on each side surface of the concrete column 1 in not less than two rows. The axial distance of each row of shear studs 3 ≤ 200 mm. The exposed length of the outer end of the shear stud 3 ≥ 4d. The planting depth of the shear stud 3 on the concrete column 1 ≥ 10d.

[0046] The ring beam concrete structure is formed by pouring concrete with a strength grade one higher than that of the concrete column 1.

[0047] The spacing between axially adjacent ring reinforcement units ≤ 200 mm. The spacing between radially adjacent ring reinforcements 2A in each ring reinforcement unit ≤ 100 mm.

[0048] The longitudinal reinforcements 4A are arranged radially along the concrete column 1 and are axially spaced. The inner end of the longitudinal reinforcement 4A is provided with a bending portion.

Claims

1. Concrete beam-column connection structure, comprising a concrete column (1) and a concrete beam (4) connected thereto; characterized in that The concrete column (1) is connected to the concrete beam (4) through the ring beam (2). The ring beam (2) includes ring reinforcement units axially spaced along the outer surface of the concrete column (1). Each ring reinforcement unit consists of at least two ring reinforcements (2A) concentrically and spaced apart around the outer circumference of the concrete column (1). Stirrups (2B) are radially spaced along the ring reinforcement (2A) and are fixed thereto through the ring beam concrete structure. Shear studs (3) are axially spaced and planted on the side surface of the concrete column (1). The concrete column (1) is anchored to the ring beam concrete structure through the shear studs (3) planted on its surface. The concrete beam (4) includes longitudinal reinforcements (4A) and a concrete structure arranged outside thereof. The inner end of the longitudinal reinforcement (4A) is anchored to the ring beam concrete structure in a hinged manner.

2. The concrete beam-column connection structure according to claim 1, characterized in that The adjacent surface between the concrete column (1) and the ring beam (2) is a rough surface.

3. The concrete beam-column connection structure according to claim 1, characterized in that The stirrup (2B) adopts a rectangular structure wound around the outside of the ring reinforcement (2A) and adapted thereto.

4. The concrete beam-column connection structure according to claim 1, wherein The diameter d of the shear stud (3) is ≥16 mm. The shear studs (3) are planted on each side surface of the concrete column (1) in not less than two rows. The axial distance of each row of shear studs (3) is ≤200 mm. The exposed length of the outer end of the shear stud (3) is ≥4d. The planting depth of the shear stud (3) on the concrete column (1) is ≥10d.

5. The concrete beam-column connection structure according to claim 1, characterized in that The ring beam concrete structure is formed by pouring concrete with a strength grade higher than that of the concrete column (1).

6. The concrete beam-column connection structure according to claim 1 or 3, characterized in that The distance between axially adjacent ring reinforcement units is ≤200 mm. The distance between radially adjacent ring reinforcements (2A) in each ring reinforcement unit is ≤100 mm.

7. The concrete beam-column connection structure according to claim 1, characterized in that The longitudinal reinforcements (4A) are arranged radially along the concrete column (1) and are axially spaced. The inner end of the longitudinal reinforcement (4A) is provided with a bending portion.

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