CN200940313Y - Steel-concrete combined beam without top flange steel plate - Google Patents

Abstract

A new type of steel-concrete composite beam without a steel beam upper flange, including a reinforced concrete slab, a steel beam lower flange and a steel beam web, one side of the steel beam web is a serrated edge, and the serrated edge is edged by a steel plate or an H-shaped steel web It is cut by a broken line, and the sawtooth shape is inverted trapezoid, rectangle or other shapes, and the whole sawtooth extends into the reinforced concrete slab to form the shear connector of the composite beam. The upper flange of the steel beam and the single-piece shear connector and its welding are omitted, so that the amount of steel used in the composite beam is reduced, the quality of the shear connector is reliable, the production, construction and installation are simple, the bonding force with the concrete slab is large, and the cost is lower than that of ordinary steel. - Concrete composite beams are low. This new type of steel-concrete composite beam can be applied to building floor beams, crane beams and span components of composite bridges, etc.

Description

Steel-concrete Composite Beam Without Upper Flange Steel Plate

technical field

The invention relates to a composite beam, more specifically to a novel steel-concrete composite beam used in bridges and industrial and civil building floor systems, and belongs to the scope of bridges and building support components.

Background technique

The steel-concrete composite beam combines the steel beam and the concrete slab together to bear the force through the shear connector. Compared with the reinforced concrete beam, it can reduce the structural height and self-weight, thereby reducing the section size and The foundation load can reduce the construction formwork and support, and the construction is convenient. Compared with steel beams, it can reduce steel consumption, increase rigidity, improve stability, reduce structural height, and enhance corrosion resistance and durability. It has been widely used in multi-high-rise building floor systems and bridge span structures. The steel beams of steel-concrete composite beams are H-shaped steel, I-shaped steel and box-shaped section. However, the research shows that because the upper flange of the steel beam is very close to the neutral axis of the section, the stress on the upper flange of the steel beam is small when the composite beam is damaged. It plays only a minor role in the strength of the composite section, its main function is to provide stability of the steel beam during construction and to provide a location for welded shear connections. If the upper flange of the steel beam is canceled, the composite beam will be more economical; in order to ensure the effective combination of the steel beam and the concrete slab and the rigidity and strength of the composite beam, the shear connector must be welded on the steel beam, which consumes a lot of manpower and man-hours , which increases the cost and construction difficulty of the composite beam. At the same time, because the welding quality is greatly affected by human factors, it cannot be fully guaranteed, thus affecting the safety and reliability of the composite beam.

Contents of the invention

The purpose of the present invention is to solve the deficiencies and problems in the above-mentioned prior art, providing a novel composite beam in which the steel beam has only the lower flange and the web, and utilizes the zigzag edge of the steel beam web as the shear connector, The single-piece shear connector and its welding are omitted, so that the amount of steel used in the composite beam is reduced, the quality of the shear connector is reliable, the manufacture, construction and installation are simple, the bonding force with the concrete slab is large, and the cost is lower than that of ordinary steel-concrete composite Beam low.

The present invention is achieved through the following technical solutions:

A steel-concrete composite beam of the present invention comprises a reinforced concrete slab, a steel beam lower flange and a steel beam web, the steel beam in the composite beam has only a lower flange and a web, and one side of the web of the steel beam is a sawtooth edge , the entire sawtooth extends into the reinforced concrete slab to form the shear connector of the composite beam. The serrated edge of the web is cut from a steel plate or H-shaped steel web along the fold line, and the sawtooth shape is inverted trapezoidal, rectangular or other shapes; the lower flange of the steel beam and the web of the steel beam are made of steel plate or H-shaped steel Bottom flange and web.

Due to the adoption of the above structure, compared with the prior art, the steel-concrete composite beam of the present invention has the following beneficial effects:

1. The upper flange of the steel beam is omitted, saving steel and reducing the welding workload of the steel beam;

2. The single-type shear connector and its welding are omitted, saving materials and labor;

3. Serrations are used as shear connectors to ensure the quality of the connection between the steel beam and the reinforced concrete slab, and have a strong bond with the reinforced concrete slab and strong shear resistance;

4. Since the sawtooth edge is cut from the steel plate or H-shaped steel web along the fold line, two sawtooth edges are formed by cutting, and no steel is wasted.

Due to the above characteristics, the novel steel-concrete composite girder of the present invention can be used as a floor girder of a house building, a crane girder and a span member of a composite bridge, etc.

Description of drawings

Fig. 1: Structural schematic diagram of T-shaped steel-concrete composite beam of the present invention;

Fig. 2: Structural schematic diagram of Π-shaped steel-concrete composite beam of the present invention;

Fig. 3: Structural schematic diagram of the Π-shaped steel-concrete composite beam whose abdomen is filled with concrete in the present invention;

Figure 4: Schematic diagram of H-shaped steel web dissection;

Figure 5: Schematic diagram of steel plate dissection.

Detailed ways

Embodiment one

As shown in Figures 1 and 4, a T-shaped steel-concrete composite beam of the present invention includes a reinforced concrete slab 1, a steel beam lower flange 2, and a steel beam web 3, and one side of the steel beam web 3 is sawtooth Side 4, the sawtooth shape is an inverted isosceles trapezoid, the web sawtooth edge is cut from the H-shaped steel web along the fold line, the entire sawtooth 4 extends into the upper reinforced concrete slab to form the shear connector of the composite beam, the lower flange of the steel beam 2 and steel beam web 3 are the lower flange and web of H-shaped steel.

Embodiment two

As shown in Figures 1 and 5, a T-shaped steel-concrete composite beam of the present invention includes a reinforced concrete slab 1, a steel beam lower flange 2, and a steel beam web 3, and one side of the steel beam web 3 is sawtooth Side 4, the sawtooth shape is an inverted isosceles trapezoid, the web sawtooth edge is cut from the steel plate along the fold line, the whole sawtooth 4 extends into the upper reinforced concrete slab to form the shear connector of the composite beam, the lower flange of the steel beam 2 and the steel The beam web 3 is welded to form T-shaped steel.

Embodiment three

As shown in Figure 2 and Figure 5, a Π-shaped steel-concrete composite beam of the present invention includes a reinforced concrete slab 1, a steel beam lower flange 2, and a steel beam web 3, and one side of the steel beam web 3 is sawtooth Side 4, the sawtooth shape is an inverted isosceles trapezoid, the web sawtooth edge is cut from the steel plate along the fold line, the entire sawtooth 4 extends into the upper reinforced concrete slab to form the shear connector of the composite beam, the lower flange of the steel beam 2 and the web Plates 3 are connected by welding to form Π-shaped steel.

Embodiment four

As shown in Fig. 3 and Fig. 5, a Π-shaped steel-concrete composite beam whose belly is filled with concrete according to the present invention includes a reinforced concrete slab 1, a steel beam lower flange 2, a steel beam web 3 and belly concrete 5, steel One side of the beam web 3 is a serrated edge 4, and the serrated edge is cut from a steel plate along a fold line. The entire sawtooth 4 extends into the upper reinforced concrete slab to form a shear connector of the composite beam, and the lower flange 2 of the steel beam and the web 3 are connected by welding to form a Π-shaped steel.

Claims (4)

1. A novel steel-concrete composite beam, comprising a reinforced concrete slab, a steel beam lower flange and a steel beam web, characterized in that: the steel beam in the composite beam has only a lower flange and a web. 2. The steel-concrete composite beam according to claim 1, characterized in that: one side of the web is a sawtooth edge, and the entire sawtooth extends into the reinforced concrete slab as a shear connector. 3. The steel-concrete composite beam according to claim 1, characterized in that: the serrated edge of the web is cut from steel plate or H-shaped steel web along the fold line, and the sawtooth shape is inverted trapezoid, rectangle or other shapes. 4. The steel-concrete composite beam according to claim 1, characterized in that: the lower flange and web of the steel beam are the lower flange and web of steel plate or H-shaped steel.

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