CN2663553Y - Composite beam of floorslab on bottom flange of steel beam - Google Patents

Abstract

The utility model discloses a composite beam structure in which the floor is located at the lower flange of the steel beam, which is composed of a reinforced concrete floor (1) and a steel beam (2), and the fabricated reinforced concrete floor (1) is placed on the steel beam (2) ) lower flange. The composite beam of this structure can reduce the floor height under the condition of the same floor height; it can effectively reduce the area of the outer wall, save the energy required for indoor air conditioning, reduce the cost of building maintenance, and has good seismic performance.

Description

Composite beams with slabs at the lower flanges of steel beams

1. Technical field:

The invention relates to a building structure, in particular to a composite beam structure in which the floor is located at the lower flange of the steel beam.

2. Technical background

With the needs of social production and people's life and the progress of science and technology, high-rise building structures have developed greatly in my country since the 1970s, especially high-rise building steel structures, because of their high strength, high ductility, and earthquake resistance. It has good performance and is widely used by structural engineers. The continuous increase in building height will inevitably lead to a substantial increase in construction costs. In order to reduce the construction cost and increase the profit of the enterprise, the enterprises in the construction industry are trying to find ways to reduce the total height of the building and improve the utilization rate of the headroom under the premise of ensuring the number of floors of the building, which has led to a new type of structure different from the traditional structure. Generation of structural systems.

The floor is located at the lower flange of the steel beam. The composite beam is a structural form that combines the properties of steel and concrete to form a whole and work together. Compared with the structure made of a single material, it can improve the strength and rigidity of the structure and save steel. , reduce the cost, and can have more significant technical and economic effects. Composite beams can make full use of the mechanical properties of steel and concrete. You can also: 1. Reduce the cross-section, because the fairly wide concrete participates in the compression resistance, the moment of inertia of the composite beam is much larger than that of the steel beam, which can achieve the effect of reducing the beam height and increasing the storey height. 2. Good stability. Due to the large lateral stiffness of the upper flange of the composite beam, the overall stability is good. In addition, the compression flange of the steel beam is constrained by the concrete slab, and the local stability of the flange and web is improved. . 3. Good ductility, due to strong energy dissipation capacity and good overall stability, it shows good seismic performance in actual earthquakes. 4. Good impact resistance and fatigue resistance. Actual engineering shows that composite beams used for bridges and crane beams have better impact resistance and fatigue resistance. 5. The service life is extended. Due to the existence of the concrete slab, the stress level of the upper flange of the steel beam is reduced, and the damage caused by cracks is small, and the service life of the steel crane beam is much improved. However, because the group and the beam have more connectors than the non-composite beam, the workload of making and welding the connectors is correspondingly increased.

3. Contents of the invention

The purpose of the utility model is to provide a new composite beam structure on the basis of the composite beam in the prior art. The composite beam of this structure can reduce the storey height under the condition of the same floor net height. The composite beam structure can effectively reduce the area of the outer protective wall, save energy required for indoor air conditioning, reduce building maintenance and use costs, and has good seismic performance.

In order to solve the problems of the technologies described above, the utility model is achieved in that:

It comprises a reinforced concrete floor (1) and a steel beam (2). The reinforced concrete floor (1) is equipped with steel bars (8) and poured with concrete. The steel beam (2) consists of a web (3), an upper The flange (4) and the lower flange (5) are spliced and welded into I-beams, and one end face of the reinforced concrete floor (1) is placed on the upper end of the lower flange (5) of the steel beam (2) and fixedly connected; A shear stud (6) is welded on the lower flange (5) of the steel beam (2).

The steel beam (2) is a welded steel beam or a rolled H-shaped steel beam.

Compared with the prior art, the utility model has the following beneficial effects:

1. Compared with the connection form of the prior art, the connection form of the utility model can reduce the area of the peripheral wall and save the energy required for indoor air conditioning.

2. Under the condition that the total height of the building is determined, the floor of the utility model can be increased than that of the prior art, thereby increasing the building area.

3. The in-plane rigidity of the structure floor of the utility model is infinite.

4. Compared with the connection form of the prior art, the connection form of the present utility model has stronger energy dissipation capacity than the traditional connection form, better seismic performance, and greatly improved ductility, so it is a kind of better seismic performance. The structure is more suitable for seismic areas than traditional connection methods.

4. Description of drawings

Fig. 1 is the cross-sectional structural diagram of the composite beam in which the floor slab is positioned at the upper flange of the steel beam in the prior art;

Fig. 2 is the sectional structural diagram of the composite beam (fixed by shear nails) where the floor slab of the present invention is located at the lower flange of the steel beam;

Fig. 3 is the sectional structural diagram of the composite beam (fixed by negative reinforcement) where the floor slab of the present invention is positioned at the lower flange of the steel beam;

5. Specific implementation

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

Example:

The utility model comprises a reinforced concrete floor 1 and a steel beam 2. One end of the reinforced concrete floor 1 is placed on the upper end of the lower flange 5 of the steel beam 2, and the steel beam 2 and the reinforced concrete floor 1 are fixed by shear nails 6.

Referring to Fig. 2, Fig. 3, the utility model manufacturing process is as follows:

1. Manufacture of steel beams: according to the requirements of construction engineering and construction technology, carry out numbering and blanking; splice the web 3, upper flange 4, and lower flange 5, assemble them into I-beams, and weld the steel beams; and Correct the deformation and upper stiffener to ensure the vertical position of the steel beam, and finally hoist the steel beam.

2. Manufacture of concrete slab: According to the construction conditions and the relevant regulations of "Code for Construction and Acceptance of Reinforced Concrete Engineering", cast-in-place slabs can be used, and the reinforced concrete floor slab 1 made is placed on the lower flange of the steel beam 2.

3. Temporary support: When the beam needs to be provided with temporary support according to the design requirements, after the steel beam is hoisted, the temporary support is set according to the requirements of the design drawings, and the temporary support can be removed until the concrete strength grade meets the design requirements.

4. Remove steel pollutants: In order to ensure the adhesion between the steel beam and the concrete, the lower flange of the steel beam must not be painted with paint. Before pouring the concrete slab, rust, welding slag, ice, snow, mud and Miscellaneous.

5. Installation: Weld the shear studs 6 on the lower flange of the steel beam 2 according to the design requirements, and ensure the appropriate spacing, diameter and rod length of the shear studs 6 (see Figure 2). Also have a kind of fixing method in addition: on the web 3 of steel girder 2, perforate negative reinforcement 7, and negative reinforcement 7 and web 3 are welded (see figure 3).

6. Concrete can be poured according to the general method.

Claims (2)

1. a floor is positioned at the compound beam of girder steel bottom flange, it comprises reinforced concrete floor (1), girder steel (2), is furnished with reinforcing bar (8) in the described reinforced concrete floor (1), and fluid concrete, described girder steel (2) is welded into i iron by web (3), top flange (4) and bottom flange (5) splicing, it is characterized in that: an end face of described reinforced concrete floor (1) places the upper end of girder steel (2) bottom flange (5) also fixedly connected; Go up welding WELDING STUDS (6) in the bottom flange (5) of girder steel (2).

2. floor according to claim 1 is positioned at the compound beam of girder steel bottom flange, it is characterized in that: girder steel (2) is welded steel beam or rolling H section steel beam.

Images