Concrete-filled steel tubes against peeling damage

Abstract

The invention discloses a concrete filled steel tube capable of preventing stripping damage. The concrete filled steel tube comprises a steel tube (1) and concrete (2), wherein a geotechnical cloth layer (3) is arranged between the steel tube (1) and the concrete (2); the geotechnical cloth layer (3) is arranged close to the inner wall of the steel tube (1) and connected with the inner wall of the steel tube (1) through structural adhesive (4). The concrete filled steel tube capable of preventing the stripping damage has the advantages that geotechnical cloth high in tensile strength is selected for restraining boundary concrete in the concrete filled steel tube, so that the shrinkage strain of the boundary concrete is reduced, and the fluidity of the dense concrete is not influenced; the geotechnical cloth is closely adhered to the inner wall of the steel tube; the elastic deformation is generated in the presence of the shrinkage strain of the boundary concrete, so that the stripping damage to the concrete filled steel tube is avoided, and the stability and the anti-seismic property of the concrete filled steel tube are improved.

Description

technical field [0001] The invention relates to the technical field of steel pipe concrete, in particular to a steel pipe concrete for preventing peeling damage. Background technique [0002] At the beam-column joints, the steel bars in the beam need to be inserted into the CFST column, which brings difficulties to the concrete vibration in the CFST column. Most projects use self-compacting concrete that does not need to be vibrated. After the self-compacting concrete is hardened, the shrinkage deformation is relatively large, so the peeling damage of the steel tube concrete column will occur. [0003] At present, expansion agents are mainly added to self-compacting concrete to reduce the shrinkage and deformation of concrete, but the expansion caused by the expansion agent occurs in the early stage, and shrinkage will still occur in the later stage. The amount of expansion agent added is not easy to control. If the amount is too large, the hydration product of the expansio...

AI Technical Summary

Problems solved by technology

[0004] Another method is to add shrinkage agent or polypropylene fiber to self-compacting concrete to reduce the shrinkage deformation of concrete, but this method can only compensate part of the shrinkage strain of concrete and cannot solve the problem of peeling damage

The incorporation of polypropylene fibers will reduce the fluidity of self-compacting concrete, resulting in poor compactness of poured concrete, thereby reducing bearing capacity and stability

Images