A method for repairing and strengthening concrete structures in harsh environments
A technology for concrete structures and harsh environments. It is applied in building maintenance, building construction, construction, etc. It can solve the problems of lack of patents and documents, and achieve the effect of strong reinforcement, wide application and good corrosion resistance.
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[0030] Embodiment 1: A beam is strengthened with the method of the present invention, and the cross-sectional size of the beam is 500mm high and 250mm wide. The environmental category is Class I, the concrete strength grade is C25, and the compressive design strength 11.9N / mm 2 , the member is equipped with 4 HRB335-level main reinforcements with a diameter of 16mm, and the tensile design strength 300N / mm 2 , the thickness of the protective layer is 35mm, and the design value of the bending moment at the mid-span of the beam is 100kN m. Since the beam needs to temporarily bear the force exceeding the design load, under the action of the new load, the maximum bending moment at the mid-span of the beam should reach 300kN m. Reinforcement of the structure is required.
[0031] The strengthening method of this structure is proposed to adopt the combination of FRP reinforcement and fiber braided mesh. The fiber composite bar made of glass fiber, the tensile strength of the GF...
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