Structure for improving section grade of composite beam through double stiffened ribs

Abstract

The utility model provides a structure for improving the section grade of a composite beam through double stiffening ribs. The structure comprises a steel beam, longitudinal stiffening ribs, short stiffening ribs and a concrete floor. The concrete floor and the steel beam are connected through a connecting piece. The steel beam is provided with a neutral shaft, a compression area is formed on the part above the neutral shaft, longitudinal stiffening ribs and short stiffening ribs are installed on the outer side of the steel beam, the longitudinal stiffening ribs are located at the neutral shaft, and the longitudinal stiffening ribs are symmetrically arranged on the two sides of a web of the steel beam. The short stiffening ribs are located between the T-shaped compression area of the steel beam and the longitudinal stiffening ribs, are evenly arranged at intervals in the longitudinal direction of the steel beam and are symmetrically arranged on the two sides of a web of the steel beam. The double stiffening ribs are arranged in the pressed area of the steel beam for reinforcement, the T-shaped pressed area of the steel beam is reinforced into the H-shaped section, meanwhile, the short stiffening ribs provide lateral support for the upper flange, local buckling is avoided, the pressed areas of the upper flange and the web plate both meet the requirement of the S1 section grade, and meanwhile the flexural capacity of the composite beam is improved.

Description

Technical Field

[0001] This utility model relates to the field of steel structure technology, specifically to a structure that improves the cross-sectional grade of composite beams through double stiffening ribs. 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 out 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 double stiffeners 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 through double stiffening ribs.

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

[0005] A structure for improving the cross-sectional grade of a composite beam through double stiffeners includes a steel beam and a concrete floor slab; the concrete floor slab and the steel beam are connected by connectors; the steel beam has a neutral axis, and the portion above the neutral axis forms a compression zone, the compression zone including the T-shaped compression zone of the steel beam and the concrete floor slab; longitudinal stiffeners and short stiffeners are installed on the outside of the steel beam, the longitudinal stiffeners are located at the neutral axis and are symmetrically arranged on both sides of the web of the steel beam; the short stiffeners are located between the T-shaped compression zone of the steel beam and the longitudinal stiffeners, the short stiffeners are evenly spaced along the longitudinal direction of the steel beam and are symmetrically arranged on both sides of the web of the steel beam.

[0006] As a further improvement to this scheme, the longitudinal stiffeners, short stiffeners, and steel beams are all welded together.

[0007] 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.

[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] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention strengthens the T-shaped compression zone of the steel beam into an H-shaped section by adding double stiffeners to the compression zone. Simultaneously, the short stiffeners provide lateral support to the upper flange, preventing local buckling and ensuring that both the upper flange and the web compression zone meet the requirements of the S1 section grade. Furthermore, it improves the flexural bearing capacity of the composite beam. This invention has a clear concept, simple construction, and can be widely applied in steel structure reinforcement projects. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the overall side view structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0015] The diagram is labeled as follows: 1-steel beam; 21-longitudinal stiffener; 22-short stiffener; 3-T-shaped compression zone; 4-neutral axis; 5-concrete floor slab; 6-connector. Detailed Implementation

[0016] 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.

[0017] Example 1

[0018] like Figure 1-3As shown, this embodiment provides a structure for improving the cross-sectional grade of a composite beam through double stiffeners, including a steel beam 1 and a concrete floor slab 5; 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 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, longitudinal stiffeners 21 and short stiffeners 22 are installed on the outside of the steel beam 1, the longitudinal stiffeners 21 are located at the neutral axis 4, and the longitudinal stiffeners 21 are symmetrically arranged on both sides of the web of the steel beam 1; the short stiffeners 22 are located between the T-shaped compression zone 3 of the steel beam and the longitudinal stiffeners 21, the short stiffeners 22 are evenly spaced along the longitudinal direction of the steel beam 1, and the short stiffeners 22 are symmetrically arranged on both sides of the web of the steel beam 1.

[0019] The longitudinal stiffeners 21, short stiffeners 22, and steel beam 1 are all welded together. 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.

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

[0021] This novel design strengthens the T-shaped compression zone of a steel beam by adding double stiffeners, transforming it into an H-shaped section. Simultaneously, the short stiffeners provide lateral support to the upper flange, preventing local buckling and ensuring that both the upper flange and the web compression zone meet the requirements of the S1 section grade. This also improves the flexural capacity of the composite beam. This design is clear in concept, simple in construction, and can be widely applied in steel structure reinforcement projects.

[0022] 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 a composite beam through double stiffeners, comprising a steel beam (1) and a concrete floor slab (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). Longitudinal stiffening ribs (21) and short stiffening ribs (22) are installed on the outside of the steel beam (1). The longitudinal stiffening ribs (21) are located at the neutral axis (4) and are symmetrically arranged on both sides of the web of the steel beam (1). The short stiffening ribs (22) are located between the T-shaped compression zone (3) of the steel beam and the longitudinal stiffening ribs (21). The short stiffening ribs (22) are evenly spaced along the longitudinal direction of the steel beam (1) and are symmetrically arranged on both sides of the web of the steel beam (1).

2. The structure for improving the cross-sectional grade of a composite beam by means of double stiffeners according to claim 1, characterized in that, The longitudinal stiffeners (21), short stiffeners (22), and steel beams (1) are all welded together.

3. The structure for improving the cross-sectional grade of a composite beam by means of double stiffeners 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 is formed above the neutral axis (4) of the steel beam (1) and between the upper flange.

4. The structure for improving the cross-sectional grade of a composite beam by means of double stiffeners 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 a composite beam by means of double stiffeners 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).

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