Structure and method for strengthening reinforced concrete beam column nodes

Abstract

The invention discloses a structure and a method for strengthening reinforced concrete beam column nodes. Hole seams, which are penetrated through cross sections of the beams and vertically downward extend, are respectively formed on beams in a beam column node zone along corresponding column surfaces of the columns; chamfers one-to-one corresponding to the hole seams are respectively formed on junctions of column surfaces; FRP sheets for annularly wrapping corresponding positions of columns are penetrated through the hole seams in turn; abundant spaces in the hole seams are filled with jointfilling materials. The structure and the method for strengthening reinforced concrete beam column nodes according to the invention can be adopted for overcoming the difficulty in cutting a core zone of frame beam column nodes, overcoming space obstacle of beam column nodes and effectively increasing the cutting efficiency of the core zone of beam column nodes.

Description

technical field [0001] The invention relates to the field of concrete structure reinforcement, in particular to a structure and method for reinforcing reinforced concrete beam-column joints. Background technique [0002] The beam-column node is the junction of the beam and the column, generally the junction of a column and four beams, and the four beams are respectively connected to the four sides of the column. At present, the existing frame structure has the hidden danger of insufficient shear bearing capacity in the core area of ​​beam-column joints, which seriously affects the safety performance of the structure. A large number of actual earthquake disasters also revealed that frame joints generally have the hidden danger of insufficient seismic performance. Once the core area of ​​the joint is damaged, the entire structure may lose its bearing capacity. Therefore, beam-column joints with insufficient shear resistance need to be reinforced urgently. [0003] Because FRP...

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Problems solved by technology

At present, the existing frame structure has the hidden danger of insufficient shear bearing capacity in the core area of ​​the beam-column joint, which seriously affects the safety performance of the structure

A large number of actual earthquake disasters have also revealed the hidden danger of insufficient seismic performance of frame joints. Once the core area of ​​the joint is damaged, the entire structure may lose its bearing capacity. Therefore, beam-column joints with insufficient shear resistance need to be reinforced urgently.

[0003] Because FRP cloth has the characteristics of easy bending and sticking, high tensile strength, and corrosion resistance, it is widely used in the reinforcement field, but the existing FRP reinforcement node methods generally still have the following problems: (1) The FRP reinforcement node method is still essentially The column reinforcement method is still used, but the original column reinforcement method has applicability problems in the node reinforcement because the space orthogonal beams in the joint core area form space obstacles in the joint area; (2) The original reinforcement method cannot overcome the Due to the spatial barrier formed by the joint area, the reinforcement materials can only be scattered at the end of the beam column and the knuckle area, and it is difficult to form an effective lateral closure constraint on the joint core area, and the reinforcement effect is limited; (3) in the plane joint reinforcement, FRP in the beam Anchoring at the corner of the column is prone to anchor failure, which affects the reinforcement effect

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