A reinforced concrete frame node beam negative moment assembled steel structure and its strengthening method

Abstract

The invention discloses a reinforced concrete frame node beam negative moment assembled steel structure and its reinforcement method. The assembled steel structure includes high-strength steel strips, angle steel and longitudinal steel strips at the bottom of the floor; the reinforced concrete frame nodes include vertically arranged frames Columns, vertical frame columns and frame beams arranged horizontally, and floor slabs respectively vertical frame columns and frame beams arranged horizontally on the frame beams; high-strength steel strips are bent at right angles and placed on the upper layer of the floor slab and frame columns, and high-strength steel strips The screws are respectively fixed to the floor and the frame column; the angle steel is fixed at the inner corner of the high-strength steel strip; the vertical legs of the angle steel are fixed to the high-strength steel strip and the frame column through the screw; the longitudinal steel strip at the bottom of the floor is symmetrically arranged on both sides of the frame beam, And close to the frame beam and fixed on the lower floor of the floor; the horizontal section of the high-strength steel plate is fixed with the floor and the longitudinal steel belt at the bottom of the floor through bolts, and the inner corner is fixed with the bolt and the horizontal leg of the angle steel, the floor and the longitudinal steel belt at the bottom of the floor.

Description

technical field [0001] The invention relates to the field of reinforcement and assembly structures of civil and construction engineering, in particular to a negative moment assembly steel structure of reinforced concrete frame node beams and a reinforcement method thereof. Background technique [0002] Due to the change of the building's use function, the load on the reinforced concrete frame beam will change accordingly, which may exceed the original design value, so that the safety of the frame beam does not meet the requirements of the code, especially in the negative moment area, which needs to be reinforced. Existing reinforcement methods include sticking carbon fiber (CRFP) or sticking steel plates, which use chemical glue to stick fiber layers or steel plates on the concrete surface. On the one hand, there are high requirements for the strength level and surface quality of concrete. Poor fire resistance and easy aging. Although the tensile strength of carbon fiber or...

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Problems solved by technology

[0002] Due to the change of the building's use function, the load on the reinforced concrete frame beam will change accordingly, which may exceed the original design value, so that the safety of the frame beam does not meet the requirements of the code, especially in the negative moment area, which needs to be reinforced

Existing reinforcement methods include sticking carbon fiber (CRFP) or sticking steel plates, which use chemical glue to stick fiber layers or steel plates on the concrete surface. On the one hand, there are high requirements for the strength level and surface quality of concrete. Poor fire resistance, easy aging

Although the tensile strength of carbon fiber or steel plate is much higher than that of concrete, the shear force and tensile force between the two are transmitted through the adhesive layer, and the performance of the adhesive layer depends on the concrete. Once the concrete is peeled off and cracked, carbon fiber or steel plate cannot exert its full potential. strength, loss of reinforcement

These methods have limited improvement in the resistance to the negative moment area of ​​concrete beams, are highly dependent on the technical level of on-site reinforcement construction, and have insufficient reliability.

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