CN204199537U - A kind of assembled steel and concrete combination beam - Google Patents

Abstract

The utility model discloses a kind of assembled steel and concrete combination beam, belong to building material technical field, comprise layer of concrete and horizontally disposed girder steel, girder steel is made up of girder steel top flange, steel beam web plate and girder steel bottom flange, be connected with lower reinforcing bar in the inner side of girder steel bottom flange, layer of concrete is arranged between girder steel bottom flange and lower reinforcing bar.The utility model plays the feature that concrete material rigidity is large, cost is low, fireproof performance is good while giving full play to high, the easy to connect advantage of girder steel intensity, the performance advantage of bi-material is combined, reaches reasonable stress, economical and practical effect.

Description

A prefabricated steel and concrete composite beam

technical field

The utility model belongs to the technical field of building materials, in particular to an assembled steel and concrete composite beam.

Background technique

Concrete and steel are the two most important building materials at present. The combination performance of the two is good, but the material performance is significantly different. On the one hand, concrete has high rigidity, convenient materials, low cost, good compression and fire resistance, but has disadvantages such as poor tensile performance, poor ductility, and low degree of industrialization; on the other hand, steel has high strength, convenient connection, and high degree of industrialization. , has good plasticity and can better meet the functional requirements of buildings, but there are also problems such as high cost and complicated anti-rust and fire-proof treatment.

In the process of building structure design, the stiffness and strength of the structure are two very important design indicators. Design specifications. For example, "Code for Seismic Design of Buildings" GB50011-2010 and "Technical Regulations for Concrete Structures of High-Rise Buildings" JGJ3-2010 both stipulate the shear-to-weight ratio and interstory displacement index of the structure under the corresponding seismic intensity. The overall stiffness makes the demands. In addition, Article 9.1.11 of JGJ3-2010 "Technical Regulations for Concrete Structures of High-Rise Buildings" stipulates the standard value of floor seismic shear force distributed according to the lateral stiffness of the frame part of the frame-core tube structure. While meeting the design requirements, it must have a certain degree of rigidity. In the current steel frame structure, if the stiffness design index does not meet the requirements of the relevant codes, the common solution is to increase the cross-sectional size of the steel frame (especially the steel beam) member, which makes the strength index excessively rich while increasing the member stiffness. As a result, the amount of steel used has increased, and the cost of anti-rust and fire prevention measures has also increased.

Therefore, it is one of the main research topics in the field of architectural structure design to rationally combine the two materials of steel and concrete to better utilize their complementary advantages in material properties.

Utility model content

The purpose of the utility model is to provide an assembled steel and concrete composite beam, which solves the problem of material waste caused by excessive strength index of the composite steel beam in the prior art.

The technical scheme adopted by the utility model is: an assembled steel and concrete composite beam, including a concrete layer and a steel beam arranged horizontally, the steel beam is composed of the upper flange of the steel beam, the web of the steel beam and the lower flange of the steel beam. The inner side of the lower flange is connected with a lower steel bar, and the concrete layer is arranged between the lower flange of the steel beam and the lower steel bar.

The utility model is also characterized in that:

An upper reinforcing bar is connected to the inner side of the upper flange of the steel beam, and a concrete layer is arranged between the upper flange of the steel beam and the upper reinforcing bar.

The upper reinforcing bars include interconnected upper longitudinally distributed reinforcing bars and upper transversely distributed reinforcing bars, and the lower reinforcing bars include interconnected lower longitudinally distributed reinforcing bars and lower transversely distributed reinforcing bars.

One end of the upper horizontally distributed reinforcement is affixed to the inner side of the upper flange of the steel beam, the other end of the upper laterally distributed reinforcement is affixed to the web of the steel beam, one end of the lower horizontally distributed reinforcement is affixed to the inner side of the lower flange of the steel beam, and the lower horizontal The other end of the distribution reinforcement is fixed on the web of the steel beam.

The inner side of the upper flange of the steel beam is fixed to the upper shear connector, and the upper shear connector is connected to the upper transversely distributed reinforcement; the inner side of the lower flange of the steel beam is fixed to the lower shear connector, and the lower shear connector is connected to the lower laterally distributed connect.

Fixing is specifically welding.

The upper steel bar and the lower steel bar are steel mesh.

The beneficial effects of the utility model are: the utility model is an assembled steel and concrete composite beam, which fully utilizes the advantages of high strength of the steel beam and convenient connection, and at the same time takes advantage of the characteristics of high rigidity of the concrete material, low cost, and good fire resistance. The performance advantages of the two materials are combined to achieve reasonable stress, economical and practical effects.

Description of drawings

Fig. 1 is the structural representation of a kind of assembled steel and concrete composite beam of the utility model;

Fig. 2 is the schematic diagram of the first embodiment of the cross section of Fig. 1;

FIG. 3 is a schematic diagram of a second embodiment in cross section of FIG. 1 .

In the figure, 1. Upper flange of steel beam, 2. Web of steel beam, 3. Lower flange of steel beam, 4. Concrete layer, 5-1. Upper longitudinally distributed reinforcement, 5-2. Lower longitudinally distributed reinforcement, 6-1 . Upper horizontally distributed reinforcement, 6-2. Lower horizontally distributed reinforcement, 7-1. Upper shear connector, 7-2. Lower shear connector, 8. Frame column.

detailed description

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

The utility model is an assembled steel and concrete composite beam. As shown in Figure 1, a group of steel and concrete composite beams of the present utility model is arranged between two frame columns 8. The composite beam main body includes a steel beam and a concrete layer . The steel girder is composed of the upper flange 1 of the steel girder, the lower flange 3 of the steel girder and the web 2 of the steel girder. Above the lower flange 3 of the steel girder and below the upper flange 1 of the steel girder, a concrete layer 4 of appropriate thickness is poured. The upper and lower layers The concrete layer 4 is respectively distributed with upper steel bars and lower steel bars, forming a new composite beam. Steel structures are still used at both ends of the composite beam so as to be connected with the frame column 8.

The upper reinforcing bars include interconnected upper longitudinally distributed reinforcing bars 5-1 and upper transversely distributed reinforcing bars 6-1, and the lower reinforcing bars include interconnected lower longitudinally distributed reinforcing bars 5-2 and lower transversely distributed reinforcing bars 6-2. As shown in Figure 2, one end of the upper transversely distributed reinforcement 6-1 is affixed to the inner side of the upper flange 1 of the steel beam, the other end of the upper laterally distributed reinforcement 6-1 is affixed to the steel beam web 2, and the lower laterally distributed reinforcement 6-1 One end of -2 is affixed to the inner side of the lower flange 3 of the steel beam, and the other end of the lower transversely distributed reinforcement 6-2 is affixed to the web 2 of the steel beam.

It can also be designed as shown in Figure 3, that is, the upper shear connector 7-1 is fixed on the inner side of the upper flange 1 of the steel beam, and the upper shear connector 7-1 is connected with the upper transversely distributed steel bar 6-1 , the lower shear connector 7-2 is fixed on the inner side of the lower flange 3 of the steel beam, and the lower shear connector 7-2 is connected with the lower laterally distributed steel bar 6-2.

All the above-mentioned fixing methods may specifically be welding. The upper longitudinally distributed reinforcing bars 5-1 and the upper transversely distributed reinforcing bars 6-1 and the lower longitudinally distributed reinforcing bars 5-2 and the lower transversely distributed reinforcing bars 6-2 can be bound and connected.

The assembled steel and concrete composite beam of the utility model can adopt high-strength and high-performance concrete materials, so as to achieve the purpose of improving the rigidity of the composite beam while saving energy and protecting the environment.

According to the principle of equivalent section stiffness, the two ends of the composite beam are still pure steel sections. During construction, the two ends of the composite beam are connected to the frame columns 8 by bolts or welding to form a common stress system of the frame.

The steel and concrete composite beam of the present utility model also can not establish the steel bar and the concrete layer on the lower side of the upper flange 1 of the steel beam. The upper longitudinally distributed reinforcing bars 5-1 and the upper transversely distributed reinforcing bars 6-1 as well as the lower longitudinally distributed reinforcing bars 5-2 and the lower transversely distributed reinforcing bars 6-2 can be replaced by other similar reinforcement meshes.

The steel and concrete composite beam of the utility model, on the premise that the bearing capacity of the steel beam meets the design requirements, increases its stiffness by combining with concrete to meet the structural stiffness requirements, and fully exerts its strength on the premise that the connection method and building use function do not change. The combined advantages of steel and concrete materials reduce the amount of structural steel. In addition, the joints between the concrete layer and the upper and lower steel beam flanges do not need to take fire-proof and anti-rust coating measures, which reduces the coating area of steel structures and greatly reduces the cost of steel structures.

Claims (7)

1. an assembled steel and concrete combination beam, comprise layer of concrete (4) and horizontally disposed girder steel, girder steel is made up of girder steel top flange (1), steel beam web plate (2) and girder steel bottom flange (3), it is characterized in that, be connected with lower reinforcing bar in the inner side of girder steel bottom flange (3), described layer of concrete (4) is arranged between girder steel bottom flange (3) and lower reinforcing bar.

2. a kind of assembled steel according to claim 1 and concrete combination beam, it is characterized in that, be connected with upper reinforcing bar in the inner side of girder steel top flange (1), between girder steel top flange (1) and upper reinforcing bar, be provided with layer of concrete (4).

3. a kind of assembled steel according to claim 1 and 2 and concrete combination beam, it is characterized in that, described upper reinforcing bar comprises interconnective upper genesis analysis reinforcing bar (5-1) and upper transversely distributed steelbar (6-1), and described lower reinforcing bar comprises interconnective lower genesis analysis reinforcing bar (5-2) and lower transversely distributed steelbar (6-2).

4. a kind of assembled steel according to claim 3 and concrete combination beam, it is characterized in that, one end of described upper transversely distributed steelbar (6-1) is fixed in the inner side of girder steel top flange (1), the other end of upper transversely distributed steelbar (6-1) is fixed on steel beam web plate (2), one end of described lower transversely distributed steelbar (6-2) is fixed in the inner side of girder steel bottom flange (3), and the other end of lower transversely distributed steelbar (6-2) is fixed on steel beam web plate (2).

5. a kind of assembled steel according to claim 3 and concrete combination beam, it is characterized in that, the affixed upper shear connector (7-1) in inner side of described girder steel top flange (1), upper shear connector (7-1) is connected with upper transversely distributed steelbar (6-1), the affixed lower shear connector (7-2) in inner side of described girder steel bottom flange (3), lower shear connector (7-2) is connected with lower transversely distributed steelbar (6-2).

6. a kind of assembled steel according to claim 4 or 5 and concrete combination beam, is characterized in that, described is affixedly specially welding.

7. a kind of assembled steel according to claim 1 and 2 and concrete combination beam, is characterized in that, described upper reinforcing bar and lower reinforcing bar are steel mesh reinforcement.