An embedded weak link structure

Abstract

The present invention discloses an embedded weak connection structure, including a steel beam, a sliding support, a corbel and a mounting bolt. The main structure of the corbel is H-shaped, and its horizontal structure is a bearing surface, and the vertical structures on both sides are side plates, and its upper side is a semi-enclosed hollow cavity with an upper end opening; the steel beam is a variable height component with a thin end and a thick middle; the end of the steel beam is embedded in the semi-enclosed hollow cavity of the corbel; the height of the corbel is less than or equal to the height of the steel beam, and after installation, the upper end surface of the corbel is not higher than the upper end surface of the steel beam, and the lower end surface of the corbel is not lower than the lower end surface of the steel beam. The weak connection structure, by moving the corbel bearing surface downward, realizes that the end of the steel beam and the sliding support are hidden within the height of the corbel in terms of the floor height relationship. By improving the weak connection structure, a reliable connection of beams and columns can be achieved under a relatively small height requirement, and it has a certain sliding deformation ability, and can achieve that there is no redundant protruding structure at the facade connection part, meeting the building facade requirements.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, in particular to the design of a weak connection structure used for corridors in large-scale construction. Background Art

[0002] With the development of large public buildings, commercial complexes, and large office buildings, weak connection structures have appeared in more and more buildings. In actual projects, weak connections are generally achieved through steel beams, sliding bearings, and corbels, but these three require a certain height to meet the force requirements. When the three are superimposed, the overall height requirement is relatively large, and there is often a large protruding connection structure at the beam-column connection, which has a greater impact on the building's facade. Figure 1 , 2 As shown in Figure 3, the lower side of the end of the steel beam 1' is connected to the bracket 3' fixed to the column 5' by installing bolts 4' and sliding bearings 2'. It can be clearly seen from the figure that the total height of the connection after installation is the height of the bracket plus the height of the sliding bearing plus the height of the steel beam (i.e., htotal = hcow + hbear + hbeam). There is a large protruding structure at the beam-column connection, which affects the appearance of the building's facade. Therefore, we have improved the weak connection structure at the beam-column connection to solve the above problem. Summary of the invention

[0003] The purpose of the present invention is to provide an improved weak connection structure that effectively reduces the overall height, which can achieve reliable connection between beams and columns under lower height requirements and has a certain sliding deformation ability, so that no redundant protruding structures appear at the facade connection parts, thereby meeting the building facade requirements.

[0004] The technical solution of the present invention is: an embedded weak connection structure, including a steel beam, a sliding support, a corbel and mounting bolts, the end of the steel beam is connected to the corbel through the sliding support and the mounting bolts, the corbel is fixedly connected to the column, the main structure of the corbel is H-shaped in cross-section, its horizontal structure is a receiving surface, the vertical structures on both sides are side plates, and the upper side is a semi-enclosed hollow cavity with an open upper end; the steel beam is a variable height component with a thin end and a thick middle part; the end of the steel beam is embedded in the semi-enclosed hollow cavity of the corbel; the height of the corbel is less than or equal to the height of the steel beam, and after installation, the upper end surface of the corbel is not higher than the upper end surface of the steel beam, and the lower end surface of the corbel is not lower than the lower end surface of the steel beam.

[0005] Preferably, the receiving surface on the corbel for supporting the end of the steel beam is arranged at a middle and lower position in the vertical direction of the corbel.

[0006] Preferably, the sliding support is installed in the middle of the upper end of the supporting surface, and the supporting surface, the sliding support and the steel beam are connected in sequence from bottom to top by installing bolts.

[0007] Preferably, four steel beam limiting plates are fixedly provided on the lower end surface of the end of the steel beam, and the internal space enclosed by the four steel beam limiting plates is the installation area of ​​the sliding support, which is rectangular.

[0008] Preferably, a support limiting plate is fixedly provided on the upper end surface of the receiving surface; the support limiting plate is arranged on the side away from the connection with the column and parallel to the column.

[0009] Preferably, the lower end surface of the steel beam limit plate is lower than the upper end surface of the support limit plate.

[0010] Preferably, a plurality of vertical reinforcing ribs are fixedly provided on the lower end surface of the receiving surface.

[0011] Preferably, flange plates perpendicular to the side plates are fixedly provided on the outer sides of the upper ends of the two side plates.

[0012] Preferably, one or more horizontal reinforcing ribs perpendicular to the side panels are fixedly provided on the outer sides of the middle portions of the two side panels.

[0013] Preferably, the mounting bolt is installed with the fixed nut at the upper end and the movable nut and the fixing device at the lower end.

[0014] The advantages of the present invention are:

[0015] 1. Compared with the prior art, by moving the corbel bearing surface downward to the middle and lower position of the overall corbel, the steel beam end and the sliding support are hidden within the corbel height in terms of the floor height relationship;

[0016] 2. The ends of the steel beams are designed as variable height components, that is, the principle that the bending moment at the ends of the steel beams is small and the bending moment in the middle of the span is large is reasonably utilized in the weak connection structure. The height of the ends of the steel beams is reduced while meeting the shear resistance requirements, and the steel beams are made higher in the middle of the span according to the actual bending moment and deflection control requirements;

[0017] 3. Multiple reinforcing ribs are arranged under the corbel bearing surface to ensure the local bending and compression resistance of the steel corbel bearing surface;

[0018] 4. Flange plates are arranged at the upper ends of the outer sides of the two side plates of the corbel and horizontal reinforcing ribs are arranged in the middle to ensure the local bending and compression resistance of the corbel side plates; when the flange plates are accidentally damaged, the horizontal reinforcing ribs can replace the flange plates to form a second line of defense for the side plate stress;

[0019] 5. Install limit devices on the steel beam and corbel respectively. Under the action of medium or large earthquakes, the sliding bearing will first have a certain deformation and energy absorption capacity. If the sliding bearing is damaged, the side plate of the corbel and the support limit plate will prevent the steel beam from falling off, forming a second line of defense to prevent falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a structural schematic diagram of a common weak connection structure in the prior art;

[0022] Figure 2 for Figure 1 Middle AA section view;

[0023] Figure 3 for Figure 1 Cross-section along BB direction;

[0024] Figure 4 It is a structural schematic diagram of the weak connection structure of Example 1;

[0025] Figure 5 for Figure 4 Middle CC section;

[0026] Figure 6 for Figure 4 Middle DD section;

[0027] Figure 7 for Figure 4 EE section view;

[0028] Figure 8 This is the exterior elevation of the weak connection structure after installation;

[0029] Fig. 9 It is a structural schematic diagram of the weak connection structure of the second embodiment;

[0030] Fig.10 for Fig. 9 Middle FF section view;

[0031] Among them: 1. Steel beam; 1-1. Steel beam limit plate; 2. Sliding bearing; 2-1. Bearing limit plate; 3. Corbel; 3-1. Supporting surface; 3-2. Side plate; 3-3. Vertical reinforcing rib; 3-4. Flange plate; 3-5. Horizontal reinforcing rib; 4. Mounting bolts; 5. Column. DETAILED DESCRIPTION

[0032] Embodiment 1:

[0033] As attached Figures 4 to 8As shown, an embedded weak connection structure includes a steel beam 1, a sliding support 2, a corbel 3 and a mounting bolt 4. The end of the steel beam 1 is connected to the corbel 3 through the sliding support 2 and the mounting bolt 4, and the corbel 3 is fixedly connected to the column 5. The main structure of the corbel 3 is H-shaped in cross section, and its horizontal structure is a receiving surface 3-1, and the vertical structures on both sides are side plates 3-2, and its upper side is a semi-enclosed hollow cavity with an upper end opening; the steel beam 1 is a variable height component with a thin end and a thick middle part; the end of the steel beam 1 is embedded in the semi-enclosed hollow cavity of the corbel 3; the receiving surface 3-1 on the corbel 3 for supporting the end of the steel beam 1 is set in the middle and lower position of the corbel 3 in the vertical direction. The sliding support 2 is installed in the middle of the upper end of the receiving surface 3-1, and the receiving surface 3-1, the sliding support 2 and the steel beam 1 are connected in sequence from bottom to top through the mounting bolt 4. Four steel beam limit plates 1-1 are fixedly arranged on the lower end surface of the end of the steel beam 1. The internal space enclosed by the four steel beam limit plates 1-1 is the installation area of ​​the sliding support 2, which is rectangular. A support limit plate 2-1 is fixedly arranged on the upper end surface of the receiving surface 3-1; the support limit plate 2-1 is arranged on the side away from the connection with the column 5 and is parallel to the column 5. The lower end surface of the steel beam limit plate 1-1 is lower than the upper end surface of the support limit plate 2-1. The height of the corbel 3 is equal to the height of the steel beam 1 (i.e., h 总 =h 牛 =h 梁 ), and after installation, the upper end surface of the corbel 3 is not higher than the upper end surface of the steel beam 1, and the lower end surface of the corbel 3 is not lower than the lower end surface of the steel beam 1. Therefore, after the weak connection structure is installed, the longitudinal movement limit range of the sliding support 2 is the distance between the column 5 and the support limit plate 2-1, and the lateral movement limit range is the distance between the two side plates 3-2 of the corbel 3.

[0034] The lower end surface of the receiving surface 3-1 is fixedly provided with a plurality of vertical reinforcing ribs 3-3, which are used to ensure the local bending and compression resistance of the steel corbel receiving surface.

[0035] As attached Figure 7 , 8 As shown, flange plates 3-4 perpendicular to the side plates 3-2 are symmetrically fixed on the outer sides of the upper ends of the two side plates 3-2; horizontal reinforcing ribs 3-5 perpendicular to the side plates 3-2 are symmetrically fixed on the outer sides of the middle parts of the two side plates 3-2. The design of the flange plates 3-4 and the horizontal reinforcing ribs 3-5 is used to ensure the local bending and compression resistance of the corbel side plates, and the number of the horizontal reinforcing ribs 3-5 can be increased or decreased according to actual needs.

[0036] Further explanation of the above technical solution, the installation method of the mounting bolt 4 is that the fixed nut is at the upper end, and the spring and the movable nut are at the lower end. This installation method is convenient for later observation and maintenance, and effectively prevents the bolt from falling. The bolt installed from top to bottom will not fall unless it is manually pulled out.

[0037] Embodiment 2:

[0038] As attached Figures 9-10 As shown, an embedded weak connection structure, the height of the bracket 3 is less than the height of the steel beam 1 (i.e., h 牛 <h 梁 =h 总 ), and after installation, the upper end surface of the bracket 3 is lower than the upper end surface of the steel beam 1, and the lower end surface of the bracket 3 is flush with the lower end surface of the steel beam 1. The rest is the same as in the first embodiment.

[0039] Of course, the present invention is not limited to the above two embodiments. For example, the height of the bracket 3 is less than the height of the steel beam 1 (ie, h 牛 <h 梁 =h 总 ), it may also be that the upper end surface of the corbel 3 is lower than the upper end surface of the steel beam 1 after installation, and the lower end surface of the corbel 3 is higher than the lower end surface of the steel beam 1. This structure does not provide a structural schematic diagram. Compared with the second embodiment, the height of the corbel 3 located on the lower side of the receiving surface 3-1 is reduced.

[0040] In summary, the height of the corbel 3 is less than or equal to the height of the steel beam 1 (i.e., h 牛 ≤h 梁 ), the specific height of the corbel 3 is calculated and determined based on the actual building height, building shape, corridor length, and the bending and shearing capabilities of the corbel to ensure that the internal force of the corridor end is effectively transmitted to the frame column where it is located. If necessary, the finite element method can be used to conduct a more detailed analysis of the corbel to find out the weak points and make targeted reinforcement.

[0041] Compared with the commonly used ones in the prior art, the embedded weak connection structure of the present invention realizes that the steel beam end and the sliding support are hidden at the height of the corbel in terms of the floor height relationship by moving the steel corbel bearing surface downward. In order to meet the bending and shearing resistance of the corbel, two side plates of the corbel of conventional height are set, but these two side plates are basically overlapped with the steel beam end and the sliding support in terms of height relationship. If the column is a steel column, the steel corbel is connected to the steel column by factory pre-welding. If the column is a concrete column, under the condition of large load, the steel corbel can be connected to a section of steel embedded in the column by factory pre-welding; under the condition of small load, the steel corbel can be directly connected to the column by embedded parts. In order to prevent the steel beam from falling off under medium and large earthquakes, it is necessary to verify the large earthquake elastic-plastic displacement of the main structure at both ends of the weak connection, and superimpose the maximum elastic-plastic displacement of the main structure at both ends at the steel beam position as the maximum displacement of the sliding support. Limiting devices are installed on the steel beam and corbel respectively. Under the action of medium or large earthquakes, the sliding bearing has a certain deformation and energy absorption capacity. If the sliding bearing is damaged, the side plate of the corbel and the bearing limit plate will prevent the steel beam from falling off, forming a second line of defense to prevent falling off.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An embedded weak connection structure, comprising a steel beam (1), a sliding support (2), a bracket (3) and a mounting bolt (4), wherein the end of the steel beam (1) is connected to the bracket (3) via the sliding support (2) and the mounting bolt (4), and the bracket (3) is fixedly connected to a column (5), characterized in that: The main structure of the corbel (3) is H-shaped in cross section, wherein the horizontal structure is the receiving surface (3-1), the vertical structures on both sides are the side plates (3-2), and the upper side is a semi-enclosed hollow cavity with an upper end opening; the steel beam (1) is a variable height component with a thin end and a thick middle; the end of the steel beam (1) is embedded in the semi-enclosed hollow cavity of the corbel (3); the height of the corbel (3) is less than or equal to the height of the steel beam (1), and after installation, the upper end surface of the corbel (3) is not higher than the upper end surface of the steel beam (1), and the lower end surface of the corbel (3) is not lower than the lower end surface of the steel beam (1); The sliding support (2) is installed at the middle of the upper end of the bearing surface (3-1), and the bearing surface (3-1), the sliding support (2) and the steel beam (1) are connected in sequence from bottom to top via mounting bolts (4); Four steel beam limit plates (1-1) are fixedly provided on the lower end surface of the end of the steel beam (1); the internal space enclosed by the four steel beam limit plates (1-1) is the installation area of ​​the sliding support (2) and is rectangular; A support stop plate (2-1) is fixedly provided on the upper end surface of the receiving surface (3-1); the support stop plate (2-1) is arranged on a side away from the side connected to the column (5) and is parallel to the column (5); The lower end surface of the steel beam limiting plate (1-1) is lower than the upper end surface of the support limiting plate (2-1); Flange plates (3-4) perpendicular to the side plates (3-2) are symmetrically fixedly arranged on the outer sides of the upper ends of the two side plates (3-2); One or more horizontal reinforcing ribs (3-5) perpendicular to the side plates (3-2) are symmetrically fixedly arranged on the outer sides of the middle parts of the two side plates (3-2); The receiving surface (3-1) on the corbel (3) for supporting the end of the steel beam (1) is arranged at a middle and lower position of the corbel (3) in a vertical direction; The lower end surface of the receiving surface (3-1) is fixedly provided with a plurality of vertical reinforcing ribs (3-3); The mounting bolt (4) is mounted in such a manner that the fixed nut is at the upper end and the movable nut and the fixing device are at the lower end.

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