Structure for improving section grade of composite beam

Abstract

The utility model provides a structure for improving the section grade of a composite beam. The structure comprises a steel beam, reinforcing angle steel and a concrete floor. The concrete floor slab and the steel beam are connected through a connecting piece; the steel beam is provided with a neutralizing shaft, the part above the neutralizing shaft forms a compression area, the compression area comprises a T-shaped compression area of the steel beam and a concrete floor, reinforcing angle steel is installed on the outer side of the steel beam and located in the T-shaped compression area of the steel beam, and two limb plates of the reinforcing angle steel are tightly attached to a web and an upper flange of the steel beam respectively. The reinforcing angle steel is symmetrically arranged on two sides of a web of the steel beam. The reinforcing angle steel is arranged in the compression area of the web of the steel beam, so that the width-to-thickness ratio of the web in the compression area is reduced, the web of the composite beam meets the S1 section grade, and meanwhile, the bending resistance and the shearing resistance of the composite beam are improved. The combined beam is simple in structure and beneficial to popularization of the combined beam in a steel structure reinforcing project.

Description

Technical Field

[0001] This utility model relates to the field of steel structure technology, specifically to a structure for improving the cross-sectional grade of composite beams. Background Technology

[0002] In recent years, the requirements for steel structure reinforcement technology in existing building renovation projects have become increasingly stringent. Changes in building function, the addition of new partition walls, and increases in load factors have all led to the inability of the original steel beams to meet the required flexural bearing capacity. Composite beams that take into account the effect of concrete floor slabs can improve the flexural bearing capacity of steel beams. The current "Steel Structure Design Standard" (GB50017-2017) requires composite beams to meet the S1 section grade of plastic design requirements and specifies the arrangement of studs to restrain the compression flange. However, the stud arrangement of conventional composite beams is difficult to meet the requirement of restraining the compression flange, and the web of steel beams is often thin, making it even more difficult to meet the S1 section grade requirement. Furthermore, even if the original steel beams are designed as composite beams, the "Steel Structure Design Code" (GB50017-2003) has a lower requirement for the width-to-thickness ratio of the web, equivalent to the S2 section grade of the current "Steel Structure Design Standard" (GB50017-2017), which cannot meet the S1 requirement. In such cases, web reinforcement is also necessary. Conventional reinforcement methods involve chiseling the concrete floor slab, removing and re-welding the shear studs, increasing the spacing between the studs, and pouring concrete. Simultaneously, steel reinforcement is applied to the entire web of the steel beam. This method damages the original structure, wastes steel, and involves complex construction procedures. Therefore, we propose a structure that uses angle steel to improve the cross-sectional grade of the composite beam, reinforcing the web and upper flange of the steel beam in the compression zone, enabling the steel beam to meet the requirements of the S1 cross-sectional grade. Utility Model Content

[0003] To address the problems in the existing technology, this utility model proposes a structure that improves the cross-sectional grade of composite beams.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A structure for improving the cross-sectional grade of composite beams includes steel beams, reinforcing angle steel, and a concrete floor slab; the concrete floor slab and the steel beams are connected by connectors; the steel beams have a neutral axis, and the portion above the neutral axis forms a compression zone, the compression zone including a T-shaped compression zone of the steel beam and the concrete floor slab; reinforcing angle steel is installed on the outside of the steel beam, the reinforcing angle steel is located in the T-shaped compression zone of the steel beam, the two limbs of the reinforcing angle steel are respectively in close contact with the web and upper flange of the steel beam, and the reinforcing angle steel is symmetrically arranged on both sides of the web of the steel beam.

[0006] As a further improvement to this scheme, the steel beam has an upper flange, a lower flange, and a web; a web compression zone is formed above the neutral axis of the steel beam and between the upper flange.

[0007] As a further improvement to this solution, the reinforcing angle steel is arranged longitudinally along the steel beam, and the reinforcing angle steel is welded to the steel beam.

[0008] As a further improvement to this solution, the connector is a stud, which is welded to the upper flange of the steel beam.

[0009] As a further improvement to this solution, the connecting component is a channel steel, which is welded to the upper flange of the steel beam.

[0010] As a further improvement to this scheme, the length of the limb plate on the side of the reinforcing angle steel that is close to the web plate is the same as the height of the web plate's compression zone, and the length of the limb plate on the side of the reinforcing angle steel that is close to the upper flange plate is the same as the upper flange's overhang length.

[0011] Compared with existing technologies, the beneficial effects of this invention are: by setting reinforcing angle steel in the T-shaped compression zone of the steel beam, the width-to-thickness ratio of the web and upper flange in the compression zone is reduced, enabling the composite beam to meet the S1 section grade, while simultaneously improving the bending and shear bearing capacity of the composite beam. This invention has a clear concept and simple construction, which is conducive to promoting the use of composite beams in steel structure reinforcement projects. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the overall side view structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0016] The diagram is labeled as follows: 1-steel beam; 2-reinforcing angle steel; 3-T-shaped compression zone; 4-neutral axis; 5-concrete floor slab; 6-connector; 101-web compression zone. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1

[0019] like Figure 1-3As shown, this embodiment provides a structure for improving the cross-sectional grade of a composite beam, including a steel beam 1, reinforcing angle steel 2, and a concrete floor slab 5; the concrete floor slab 5 and the steel beam 1 are connected by a connector 6; the steel beam 1 has a neutral axis 4, and the portion above the neutral axis 4 forms a compression zone, the compression zone including the T-shaped compression zone 3 of the steel beam 1 and the concrete floor slab 5, the reinforcing angle steel 2 is installed on the outside of the steel beam 1, the reinforcing angle steel 2 is located in the T-shaped compression zone 3 of the steel beam 1, the two limbs of the reinforcing angle steel 2 are respectively close to the web and the upper flange of the steel beam 1, and the reinforcing angle steel 2 is symmetrically arranged on both sides of the web of the steel beam 1.

[0020] The steel beam 1 has an upper flange, a lower flange, and a web; a web compression zone 101 is formed above the neutral axis 4 of the steel beam 1 and between the upper flange.

[0021] The reinforcing angle steel 2 is arranged longitudinally along the steel beam 1, and the reinforcing angle steel 2 is welded to the steel beam 1.

[0022] In this embodiment, the connector 6 is a stud, which is welded to the upper flange of the steel beam 1. Alternatively, the connector 6 is a channel steel, which is welded to the upper flange of the steel beam 1.

[0023] The length of the limb plate of the reinforcing angle steel 2 on the side that is close to the web plate is the same as the height of the web plate compression zone 101, and the length of the limb plate of the reinforcing angle steel 2 on the side that is close to the upper flange is the same as the extension length of the upper flange.

[0024] By setting reinforcing angle steel in the T-shaped compression zone of the steel beam, the width-to-thickness ratio of the web and upper flange of the compression zone is reduced, enabling the composite beam to meet the S1 section grade, while improving the bending and shear bearing capacity of the composite beam.

[0025] The above description is merely an illustrative example of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A structure for improving the cross-sectional grade of composite beams, comprising steel beams (1), reinforcing angle steel (2), and concrete floor slabs (5); characterized in that, The concrete floor slab (5) and the steel beam (1) are connected by connectors (6); the steel beam (1) has a neutral axis (4), and the part above the neutral axis (4) forms a compression zone. The compression zone includes the T-shaped compression zone (3) of the steel beam (1) and the concrete floor slab (5). A reinforcing angle steel (2) is installed on the outside of the steel beam (1). The reinforcing angle steel (2) is located in the T-shaped compression zone (3) of the steel beam (1). The two limbs of the reinforcing angle steel (2) are respectively close to the web and upper flange of the steel beam (1). The reinforcing angle steel (2) is symmetrically arranged on both sides of the web of the steel beam (1).

2. The structure for improving the cross-sectional grade of composite beams according to claim 1, characterized in that, The steel beam (1) has an upper flange, a lower flange and a web; a web compression zone (101) is formed above the neutral axis (4) of the steel beam (1) and between the upper flange.

3. The structure for improving the cross-sectional grade of composite beams according to claim 1, characterized in that, The reinforcing angle steel (2) is arranged longitudinally along the steel beam (1), and the reinforcing angle steel (2) is welded to the steel beam (1).

4. The structure for improving the cross-sectional grade of composite beams according to claim 1, characterized in that, The connector (6) is a stud, which is welded to the upper flange of the steel beam (1).

5. A structure for improving the cross-sectional grade of composite beams according to claim 1, characterized in that, The connector (6) is a channel steel, which is welded to the upper flange of the steel beam (1).

6. A structure for improving the cross-sectional grade of composite beams according to claim 2, characterized in that, The length of the limb plate of the reinforcing angle steel (2) on the side close to the web is the same as the height of the web compression zone (101), and the length of the limb plate of the reinforcing angle steel (2) on the side close to the upper flange is the same as the extension length of the upper flange.

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