A weakly rigid connection joint of a steel beam and a reinforced concrete column

Abstract

The utility model discloses a weak rigid connection joint of steel beam and reinforced concrete column relates to the field of building structure design, and the technical scheme is connected with the embedded part of reinforced concrete column through the web of steel beam and the embedded part of reinforced concrete column to the connecting plate of steel beam, and the connecting plate and embedded part are welded and fixed, the upper flange of steel beam is connected with the embedded part through angle steel, and the lower flange of steel beam is fixed with the embedded part and adopts non - continuous welding. The utility model has the advantages of: effectively providing the rotational stiffness of joint: through the angle steel and embedded part connection of steel beam upper flange addition, and combining the positioning hole and oval mounting hole of steel beam web, make the connecting bolt only bear vertical shearing force, thereby guaranteeing simply supported beam stress mode at the same time, the joint has certain rotational stiffness, avoids the floor cracking caused by the excessive rotation angle.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a weakly rigid connection node between a steel beam and a reinforced concrete column. Background Technology

[0002] With the development of steel structure technology and the national policy of vigorously promoting steel structure buildings, the application of steel structure technology in engineering is becoming increasingly widespread. Due to its characteristics such as being green, lightweight, and high-strength, steel structures are often used in large-span floors and roofs to form connection nodes between steel beams and columns.

[0003] Hinged connections between steel beams and reinforced concrete columns are a common type of joint connection in steel structure and reinforced concrete design. They are simple in construction, easy to install, and save on the number of bolts. They can leverage the structural advantages of steel beams in long spans. However, because hinged joints lack rotational constraints, the beam-column joints have large rotation angles. Their rotational deformation cannot be coordinated with the reinforced concrete floor slabs or roof slabs, leading to floor cracking, potential leakage, and affecting safety. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a weakly rigid connection node between a steel beam and a reinforced concrete column.

[0005] The technical solution includes a steel beam and a reinforced concrete column. The web of the steel beam is connected to the embedded part of the reinforced concrete column through a connecting plate, and the connecting plate is welded and fixed to the embedded part.

[0006] The upper flange of the steel beam is connected to the embedded part by angle steel;

[0007] The lower flange of the steel beam is fixed to the embedded part by discontinuous welding.

[0008] Preferably, a positioning hole is provided at the middle of one end of the web of the steel beam, and a plurality of mounting holes are symmetrically arranged on the web on both sides above and below the positioning hole, and the mounting holes are elliptical in shape.

[0009] Preferably, there are two connecting plates, symmetrically arranged on both sides of the web of the steel beam. The connecting plates have positioning holes and mounting holes, which correspond to the positioning holes and mounting holes on the web of the steel beam. The connecting plates and the steel beam are fixedly connected by bolts that pass through the connecting plates and the web of the steel beam.

[0010] Preferably, one side of the angle steel is connected to the upper flange of the steel beam by two bolts, and the other side is welded to the embedded part.

[0011] Preferably, the cross-sectional area of ​​the angle steel is not less than 1 / 4 of the cross-sectional area of ​​the upper flange of the steel beam, and the thickness of the angle steel is not less than 1 / 2 of the thickness of the upper flange of the steel beam.

[0012] Preferably, the embedded part includes a steel plate, the steel plate is flush with the surface of the reinforced concrete column, a plurality of anchor bars are fixedly provided on the plate, the end of the anchor bar away from the steel plate is bent, and the anchor bar is fixedly connected to the main reinforcement of the reinforced concrete column.

[0013] The beneficial effects of the technical solution provided by this utility model embodiment are: ① Effectively providing rotational stiffness of the node: By adding angle steel to the upper flange of the steel beam and connecting it with the embedded part, and combining the positioning hole and elliptical mounting hole on the web of the steel beam, the connecting bolts only bear the vertical shear force, thereby ensuring the stress mode of the simply supported beam while the node has a certain rotational stiffness, avoiding floor cracking caused by excessive rotation angle.

[0014] ② Achieving standardized construction and simplified construction: The nodes use elliptical holes to release horizontal shear force, allowing for a certain amount of installation adjustment during construction; the angle steel and connecting plates can be prefabricated and welded in the factory, requiring only a small number of bolts and local welding on site. The construction process is similar to that of conventional steel beam nodes, making it easy to promote and apply.

[0015] ③ Reduce project costs and maintenance costs; angle steel is small in size and used in small quantities, eliminating the need for additional stiffening plates, thus avoiding excessive construction and material waste caused by excessive rigidity, helping to save material and labor costs, and reducing the workload of later maintenance.

[0016] ④ Improve the reliability and durability of the joint under stress: The lower flange of the steel beam adopts a discontinuous weld arrangement. The weld and the upper flange angle steel together form a reasonable force transmission path, which reduces welding residual stress and stress concentration, and is conducive to improving the overall stability and fatigue life of the joint.

[0017] ⑤ Wide applicability: This node structure can be used for beam-column connections in reinforced concrete frame structures, and can also provide a reference for weak rigid connections between steel beams and other column types, with strong adaptability and versatility. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the angle steel and bolts in an embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram of the connecting plate and bolts in an embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the reinforcing bars in an embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the embedded part in an embodiment of the present utility model.

[0023] The attached diagram is labeled as follows: 1. Steel beam; 2. Reinforced concrete column; 3. Connecting plate; 4. Embedded part; 5. Angle steel; 6. Positioning hole; 7. Mounting hole; 8. Bolt; 9. Steel plate; 10. Anchor bar. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only for explaining this utility model and are not intended to limit it.

[0025] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a welded connection; they can also refer to an indirect connection through an intermediate medium, or the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example 1

[0029] See Figures 1 to 5This utility model provides a weakly rigid connection node between a steel beam and a reinforced concrete column, including a steel beam 1 and a reinforced concrete column 2. The web of the steel beam 1 is connected to the embedded part 4 of the reinforced concrete column 2 through a connecting plate 3. The connecting plate 3 and the embedded part 4 are welded and fixed.

[0030] The upper flange of steel beam 1 is connected to the embedded part 4 via angle steel 5;

[0031] The lower flange of steel beam 1 is fixed to the embedded part 4 by discontinuous welding.

[0032] Discontinuous welding is used to reduce residual stress, welding deformation and time caused by welding while ensuring the necessary connection strength and rigidity, and to achieve a "weak rigidity" rather than a completely rigid connection.

[0033] A positioning hole 6 is opened at the middle of one end of the web of the steel beam 1. Several mounting holes 7 are symmetrically arranged on the web on both sides above and below the positioning hole 6. The mounting holes 7 are elliptical.

[0034] There are two connecting plates 3, which are symmetrically arranged on both sides of the web of the steel beam 1. The connecting plates 3 have positioning holes 6 and mounting holes 7. The positioning holes 6 and mounting holes 7 on the connecting plates 3 correspond to the positioning holes 6 and mounting holes 7 on the web of the steel beam 1. The connecting plates 3 and the steel beam 1 are fixedly connected by bolts 8 that pass through the connecting plates and the web of the steel beam 1.

[0035] In the connection between steel beams and columns, if the web of steel beam 1 is connected with ordinary round hole rigid bolts 8, bolts 8 will bear the horizontal force and shear force generated by the bending moment of steel beam 1, resulting in excessive node stiffness.

[0036] The elliptical hole allows for a slight free sliding between the connecting plate 3 and the web in the horizontal direction, allowing only the bolt 8 to bear the vertical shear force and releasing excess horizontal tension or thrust.

[0037] One side of the angle steel 5 is connected to the upper flange of the steel beam 1 by several bolts 8. The number of bolts 8 is not less than two, and the specification of the bolts 8 is not less than M16. The other side is welded to the embedded part 4.

[0038] The cross-sectional area of ​​angle steel 5 shall not be less than 1 / 4 of the cross-sectional area of ​​the upper flange of steel beam 1, the thickness of angle steel 5 shall not be less than 1 / 2 of the thickness of the upper flange, and the specification of angle steel 5 shall not be less than L50×4mm.

[0039] The embedded part 4 includes a steel plate 9, which is flush with the surface of the reinforced concrete column 2. Several anchor bars 10 are fixedly installed on the plate body of the steel plate 9. The end of the anchor bar 10 away from the steel plate 9 is bent. The anchor bar 10 is fixedly connected to the main reinforcement of the reinforced concrete column 2.

[0040] In use, steel plates 9 and anchor bars 10 are first pre-embedded in the reinforced concrete column 2. After the concrete is poured and formed, the steel beam 1 is hoisted into place, and the connecting plates 3 are symmetrically installed on both sides of the web of the steel beam 1. They are fixed by bolts 8 through positioning holes 6 and mounting holes 7, so that the connecting plates 3 are in close contact with the pre-embedded parts 4 and then welded and fixed. Subsequently, the angle steel 5 of the upper flange of the steel beam 1 is connected to the upper flange of the steel beam 1 with bolts 8, and the other side of the angle steel 5 is welded to the pre-embedded parts 4. Finally, the lower flange of the steel beam 1 is discontinuously welded to complete the node installation.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A weakly rigid connection joint between a steel beam and a reinforced concrete column, characterized in that, It includes a steel beam (1) and a reinforced concrete column (2). The web of the steel beam (1) is connected to the embedded part (4) of the reinforced concrete column (2) through a connecting plate (3). The connecting plate (3) is welded and fixed to the embedded part (4). The upper flange of the steel beam (1) is connected to the embedded part (4) by angle steel (5); The lower flange of the steel beam (1) is fixed to the embedded part (4) by discontinuous welding.

2. The weakly rigid connection node between a steel beam and a reinforced concrete column according to claim 1, characterized in that, A positioning hole (6) is provided at the middle of one end of the web of the steel beam (1). Several mounting holes (7) are symmetrically arranged on the web on both sides of the positioning hole (6). The mounting holes (7) are elliptical.

3. The weakly rigid connection node between a steel beam and a reinforced concrete column according to claim 2, characterized in that, There are two connecting plates (3), which are symmetrically arranged on both sides of the web of the steel beam (1). The connecting plates (3) have positioning holes (6) and mounting holes (7). The positioning holes (6) and mounting holes (7) on the connecting plates (3) correspond to the positioning holes (6) and mounting holes (7) on the web of the steel beam (1). The connecting plates (3) and the steel beam (1) are fixedly connected by bolts (8) that pass through the connecting plates (3) and the web of the steel beam (1).

4. The weakly rigid connection node between the steel beam and the reinforced concrete column according to claim 3, characterized in that, One side of the angle steel (5) is connected to the upper flange of the steel beam (1) by several bolts (8), and the other side is welded to the embedded part (4).

5. The weakly rigid connection node between a steel beam and a reinforced concrete column according to claim 3, characterized in that, The cross-sectional area of ​​the angle steel (5) is not less than 1 / 4 of the cross-sectional area of ​​the upper flange of the steel beam (1), and the thickness of the angle steel (5) is not less than 1 / 2 of the thickness of the upper flange.

6. The weakly rigid connection node between a steel beam and a reinforced concrete column according to claim 1, characterized in that, The embedded part (4) includes a steel plate (9), which is flush with the surface of the reinforced concrete column (2). Several anchor bars (10) are fixedly installed on the plate body of the steel plate (9). The end of the anchor bar (10) away from the steel plate (9) is bent. The anchor bar (10) is fixedly connected to the main reinforcement of the reinforced concrete column (2).

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