A construction method for adding layered steel frame column foot joints on the top of a multi-storey concrete frame structure

Abstract

The invention provides a layer added steel framework column base node on the top of a multi-layer concrete framework structure and a construction method thereof; the column base node comprises a section of concrete column head (5) which is cast on an original reinforced concrete column (1) and the top of a beam (2) which is connected with the original reinforced concrete column, has an enlarged cross section and is connected with a steel column (9), and a ring beam (4) which is cast together with the concrete column head (5); an anchor bolt (7) and a longitudinal bar (3) are buried in the concrete column head (5); the root of the longitudinal bar (3) is implanted into the reinforced concrete column (1); a bottom plate (6) at the bottom of the steel column (9) is fixed with the concrete column head (5) through the anchor bolt (7); an outsourced reinforced concrete column (8) at the bottom of an outsourced steel column is cast on the top of the concrete column head (5). According to the layer added steel framework column base node on top of the multi-layer concrete framework structure and the construction method thereof, the connection rigidity of a column base is improved, so that the internal force which is produced by the added layer of an upper steel structure is effectively transmitted to an original structure, meanwhile the connection integrity on an interface between new and old structures is improved, and the anti-seismic performance of the structure is improved.

Description

technical field [0001] The invention relates to the connection node between the upper steel frame column and the concrete column of the original structure in the light steel layer addition reconstruction on the top of the existing frame structure and a specific construction method, belonging to the field of construction engineering. Background technique [0002] After the steel structure is added, due to the different structural forms of the original concrete beam structure and the steel structure, there is a sudden change in stiffness and mass at the connection between the old and new structures, and it is difficult to ensure the rigid connection of the joints, so the partial deformation of the added steel structure is obvious under the earthquake increase. In view of the above problems, those skilled in the art have invented a new steel column and a column foot connecting the steel column, which can fully ensure the rigidity of the connection, and can reduce the degree of ...

AI Technical Summary

Problems solved by technology

However, in the actual project, the original concrete column head of the top floor is densely populated, and the location of the reinforcement is difficult to determine, and the original longitudinal reinforcement is not suitable for straightening and welding

These two connection methods are not suitable for realizing the bearing capacity of the rigid column foot after adding a story under complex stresses; and because there is a sudden change in the column stiffness between the added story part and the original structure above and below the added story column foot, the seismic performance of the structure is affected; And the height of the base plate of the added layer column should not be controlled

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