Method for strengthening reinforced concrete girder by using slightly curved and tensioned carbon fiber plates

Abstract

The invention relates to a method for strengthening a reinforced concrete girder by using slightly curved and tensioned carbon fiber plates, and belongs to the technical field of new material application and engineering strengthening. The method is mainly characterized in that a slightly curved concrete base plate is adhered to an adhesion surface on the bottom of the reinforced concrete girder via epoxy resin; an outward surface of the slightly curved concrete base plate is in the shape of a micro-rise arc; the carbon fiber plates are paved in grooves formed in protecting walls on two sides of the slightly curved concrete base plate; two ends of each carbon fiber plate are clamped via anchorage devices; the anchorage devices at the fixed ends of the carbon fiber plates are fixed in the reinforced concrete girder via high-strength cotters; and the anchorage devices at the tensioned ends of the carbon fiber plates are fixedly connected with guiding and positioning plates through high-strength screws. By the method, prestressing force generated by the carbon fiber plates can be uniformly transmitted to the reinforced concrete girder, the local stress of the anchorage devices is reduced, and the carbon fiber plates can be safely enclosed for a long time; and the tensioning anchorage devices has the characteristics of safety, reliability and easiness and convenience in manufacturing. The method has the advantages of high material using rate, easiness and convenience in construction procedure and high structural durability. Moreover, the method has the remarkable application prospect in the reinforcement project of reinforced concrete structures which are wide in application and high in quantity.

Description

Technical field [0001] The present invention involves a method of reinforcing steel concrete beams of micro -curved tensile carbon fiber plates, which belongs to the field of new material application and engineering reinforcement technology. Background technique [0002] Reinforced concrete beams are the main load -bearing components of the engineering structure and are widely used in projects, bridges, water conservancy and other projects.Affected by external factors such as environmental erosion, overloading and decline of their own material performance, the damage rate of more reinforced concrete beams is accelerated, the carrying capacity and rigidity are reduced, and structural reinforcement needs to be performed to ensure the reliability during their use. [0003] With the continuous development and development of new materials and new processes, the methods used for reinforcement of reinforced concrete beams are also constantly updating and progressing.On the basis of the ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for strengthening reinforced concrete beams with micro-bending carbon fiber sheets, which solves the problem that the above-mentioned carbon fiber sheet bonding reinforcement method cannot effectively utilize the carbon fiber Insufficient material strength; carbon fiber plate linear prestress tension reinforcement method can not solve the problem of reasonable distribution of prestress along the reinforcement component, through the present invention effectively improves the contact state between the carbon fiber plate and the reinforcement component, and improves the prestressing efficiency , to enhance the overall durability of the component

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