Duplex channel steel and recycled concrete combination beam

Abstract

The invention discloses a duplex channel steel and recycled concrete combination beam, comprising first channel steel and second channel steel riveted to the first channel steel. Shear-resistant connectors are disposed at the bottom of the first channel steel. The first channel steel is filled with recycled aggregate concrete. The second channel steel is fixedly connected through rivets. The thickness of a web of the second channel steel is greater than that of a web of the first channel steel. A replacement rate of recycled aggregate in the recycled aggregate concrete is 50%. In the combination beam, the lower channel steel is provided for bearing tension, the concrete in the upper channel steel is provided for bearing pressure, respective performances of the upper and lower channel steel can be given to full play, and bending resistance of the combination beam is higher; under same performances, the combination beam is lighter in weight and the seismic capacity is favorably improved; braces and form boards for use in a construction phase can be reduced, and construction is greatly facilitated; the lower channel steel gives full play to the tensile strength, the building structure is simplified, fewer rebars are tied, and construction efficiency is improved.

Description

technical field [0001] The invention belongs to the field of building structures, in particular to a composite beam. Background technique [0002] With the progress of urbanization in China, the problem of construction waste (waste) has gradually been paid attention to. If a simple stacking method is adopted, the annual construction waste disposal will cover an area of ​​at least 150 million square meters. Recycled concrete as a new material can solve this problem well. [0003] With the development of social economy and building structure, more and more steel-concrete composite structures are used. The steel-concrete composite structure fully exerts the material mechanical properties of concrete under pressure and steel under tension. The application of steel can reduce the size of concrete structures. The excessively large cross-section reduces the self-weight and is conducive to the improvement of seismic performance. [0004] The existing steel-concrete composite beam...

AI Technical Summary

Problems solved by technology

[0004] The existing steel-concrete composite beam is to bury the section steel in the concrete. To prevent the flange of the section steel from buckling outwards and cause the concrete on the outside of the flange to crack, a certain thickness of concrete protective layer is required, which will cause the bending resistance of the section steel to be incomplete. , the concrete in the tension area does not play a role but increases the self-weight of the component; the concrete used is mostly reinforced concrete, although reinforced concrete can effectively restrain the joint action of steel and concrete, but most of the binding steel bars are manually bound, and the production efficiency Low, not conducive to factory mechanized production

Images