A method for externally prestressed steel plate flexural strengthening beam

Abstract

The present invention relates to the technical field of building beam reinforcement, and in particular to a method for externally prestressed steel plate anti-bending reinforcement beam, including the following steps: (S1), assessing the status quo of the beam to be strengthened, and then selecting the steel plate to be processed according to the design requirements; S2), stretching the steel plate to be treated, so that the elongation of the steel plate to be processed meets the design requirements, and obtain a prestressed steel plate; (S3), grinding and cleaning the bottom surface of the beam to be strengthened, and then The prestressed steel plate abuts against the beam to be strengthened; (S4), fixing the prestressed steel plate to the bottom of the beam to be strengthened. This method improves the bending strength of the beam to be strengthened, improves the utilization rate of the steel plate material, solves the problem of structural stress lag, improves the bearing capacity of the beam to be strengthened, is beneficial to the structure's earthquake resistance, and is conducive to the utilization of building space, without the need for formwork , Simple operation, convenient control, low cost of engineering materials.

Description

technical field [0001] The invention relates to the technical field of building beam reinforcement, in particular to a method for externally prestressed and transplanted steel plate anti-bending reinforcement beams. Background technique [0002] Building renovation and reinforcement is a social industry resulting from the long service life of existing buildings or the change of new building functions. This industry is related to people's personal safety. The country has relevant design specifications and corresponding acceptance standards. [0003] There are many reinforcement technologies or measures, which can be said to delay the service life of the building and generate social value. These technologies have their own advantages and disadvantages and have a specific range of use. Most of the beam-type flexural members are passive reinforcement methods, while The passive reinforcement method specifications and engineering practice experience are relatively mature, but the ...

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Problems solved by technology

[0003] There are many reinforcement technologies or measures, which can be said to delay the service life of the building and generate social value. These technologies have their own advantages and disadvantages and have a specific range of use. Most of the beam-type flexural members are passive reinforcement methods, while Passive reinforcement method specifications and engineering practice experience are relatively mature, but the passive reinforcement method has the defect of force lag, and there is no theoretical formula check calculation specification for the stiffness and deformation check calculation of the passive reinforcement method

Another solution is the active reinforcement method. Applying external prestress to the reinforced member can solve the problem of stress lag of the member. The method of applying prestress to the member generally includes cooling method, support displacement method, etc. Stress materials include some high-strength materials such as carbon fibers, steel strands, and steel bars, but the strength of carbon fibers and steel strands cannot be fully utilized in reinforcement, resulting in waste of materials

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