Steel-concrete combined conversion joist

Abstract

The invention discloses a steel-concrete combined conversion girder which relates to a conversion structure used in tall buildings and skyscrapers. The combined conversion beam consists of a steel box girder, concrete poured on the top of and in the steel box girder and a shearing resistant connector. Concrete is poured on the upper part inside the steel box in the span-center bending moment area to solve the problem of the insufficient pressing area of concrete on the top of the steel box girder; concrete is not poured on a lower part inside the steel box in the span-center bending moment area, which effectively reduces the self-weight of the structure. Concrete is poured in the steel box at the girder end to keep the stability of the steel girder and to increase the vertical shearing resistant capability and the stiffness of the structure. The shearing resistant connector combines the steel girder with concrete and transfers the shearing force between the steel girder and concrete and prevents the steel girder from separating from concrete. The combined conversion girder provided by the invention is light and can save moulding boards and scaffolding; the construction of the combined conversion girder is convenient and can avoid the problem of the crack of the concrete in the span center; meanwhile, the combined conversion girder has higher stiffness and loading capacity, particularly has higher shearing resistant loading capacity at the girder end. The combined conversion girder has wider application perspective in tall buildings and skyscrapers.

Description

technical field [0001] The invention relates to a steel-concrete composite transfer beam applicable to high-rise and super high-rise buildings. It belongs to the technical field of building structures. Background technique [0002] For high-rise and ultra-high-rise buildings, in order to set up large-span spaces such as shopping malls, public halls, and parking lots in the lower part of the building, it is often necessary to change the structural form along the height direction, and set up a conversion structure at the position where the structural form changes to realize the upper structure. Requirements for the transmission of internal forces to the substructure. The transfer beam is the most commonly used form of transfer structure. At present, reinforced concrete beams, prestressed concrete beams or steel reinforced concrete beams are mostly used. These traditional transfer beams have many deficiencies in use due to their heavy weight, difficulty in construction and di...

AI Technical Summary

Problems solved by technology

However, when the steel-concrete composite beam with T-section is used as a transfer beam, the effective width of the concrete flange is usually insufficient, resulting in a low position of the neutral axis of the composite beam, which reduces the working efficiency of the composite beam and resists negative bending. Insufficient ability of moment

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