Combined flat beam

Abstract

The invention belongs to the field of structural engineering of civil engineering and particularly relates to a combined flat beam which structurally comprises a steel beam, pressing steel plates, concrete and shear reinforcements, wherein the steel beam is inverted T-shaped and composed of a steel beam bottom flange and a steel beam web; the upper part of the steel beam web is provided with saw toothed shear connectors; the pressing steel plates are placed on the steel beam bottom flange; the concrete is poured in a closed space formed by the steel beam, the pressing steel plates and end sealing plates; the shear reinforcements are arranged among the saw toothed shear connectors, and one or more shear reinforcements can be placed in each interval. The combined flat beam is greatly shorter than a traditional combined beam, so that the cost in structure, maintenance, equipment and labor is also reduced; the steel beam is coated with concrete, so that the fire-resistant performance of the combined structure is greatly improved, effective transmission of shearing force between steel and concrete is ensured, the construction technology is simplified, and excellent economy is realized.

Description

technical field [0001] The invention belongs to the field of civil engineering structure engineering, and in particular relates to a composite flat beam. Background technique [0002] At present, composite beams are widely used in building structures. It makes full use of the advantages of two materials (steel and concrete) to obtain greater rigidity and bearing capacity of the structure. Compared with reinforced concrete beams, the construction period of composite beams is shortened by 1 / 2~1 / 3, and the degree of construction disturbance is reduced, which has its incomparable advantages. [0003] like figure 1 As shown, in the traditional composite beam, the steel beam is on the bottom and mainly bears the tensile stress; the concrete is on the top and mainly bears the compressive stress. The transmission of the shear force between the steel beam and the concrete is realized through the shear connector—the peg 11, which ensures that the two materials work together in the f...

AI Technical Summary

Problems solved by technology

[0005]Aiming at these disadvantages of composite beams, European scholars proposed the concept of composite flat beams at the end of last century, and new forms of composite flat beams (slimfor, slimdek, etc.) also emerged in endlessly. However, these composite flat beams have not reached the optimal effect in terms of height, and the effectiveness and reliability of shear force transmission between steel and concrete are also insufficient.

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