Method for reinforcing rectangular-section concrete columns through prestressed steel plate hoops

Abstract

The invention discloses a method for reinforcing rectangular-section concrete columns through prestressed steel plate hoops. The method is mainly characterized in that the steel plate hoops are mounted on the concrete columns and are subjected to lateral expansion through an expanding tool, pre-tightening clamping bars are mounted and are connected with the steel plate hoops through point welding after the expanding tool is withdrawn, and the rectangular-section concrete columns are reinforced through the prestressed steel plate hoops. According to the reinforcing method, the effective active constraint functions on the corners and the four edges of each rectangular column are achieved, the basically uniform annular constraint effect can be formed, and concrete is in a stressed state in three directions, so that the performance of bearing capacity, ductility and the like of the concrete columns is improved more effectively, and the method is suitable for reinforcing construction of the rectangular-section concrete columns under axial compression or small eccentric compression.

Description

technical field [0001] The invention relates to a method for reinforcing a rectangular-section concrete column with a prestressed steel plate hoop, belonging to the technical field of building structure reinforcement. Background technique [0002] For concrete columns with a rectangular section whose bearing capacity does not meet the requirements or whose ductility needs to be improved, commonly used reinforcement methods include enlarging section reinforcement method, outsourcing carbon fiber cloth reinforcement method, outsourcing steel plate hoop, outsourcing section steel and other reinforcement methods. Among them, the steel plate hoop reinforcement method is a reinforcement method often used in practical projects. This method has the advantages of convenient material acquisition and convenient construction. For concrete columns with rectangular cross-section, when the stress level of the original column concrete is relatively high, there are certain shortcomings in th...

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Problems solved by technology

[0004] For concrete columns with rectangular cross section reinforced with prestressed outer steel hoops, under the existing prestressed reinforcement methods, there are straight sections of steel hoops on the four sides of the column. Although the stress level of steel hoops is relatively high, the constraints of steel hoops on concrete columns are mainly concentrated in At the corner of a rectangular column, there is no effective interaction constraint between the straight section of the steel plate hoop and the concrete of the column, and the constraint on the concrete by the straight section of the steel hoop is a passive constraint, that is, the concrete has cracked and obvious lateral deformation, and the straight section of the steel plate is restrained by At the same time of bending, the steel plate reacts to the lateral deformation of the concrete, obviously the restraining effect is not ideal

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