A method for prestressing and assembling prefabricated reinforced concrete frames to strengthen existing structures

Abstract

The invention discloses a method for using a prefabricated reinforced concrete frame to reinforce an existing structure through prestressing assembly, and belongs to the field of reinforced concrete structure aseismatic reinforcement in civil engineering. The method for using the prefabricated reinforced concrete frame to reinforce the existing structure through prestressing assembly comprises the steps that an existing reinforced concrete frame to be reinforced and the newly-added prefabricated reinforced concrete frame used for reinforcement are included, and the existing reinforced concrete frame to be reinforced and the newly-added prefabricated reinforced concrete frame used for reinforcement are connected into a whole in an assembly mode through unbonded prestressed reinforcing steel bars; after rebars on newly-added prefabricated frame beams, rebars on joints of newly-added prefabricated frame columns, rebars on connectors between upper-layer newly-added prefabricated frame columns and lower-layer newly-added prefabricated frame columns are bound, concreting is carried out on the rebars to form a whole; gaps are reserved between the newly-added prefabricated reinforced concrete frame and the existing reinforced concrete frame, and are sealed by mortar; channels are reserved in the newly-added prefabricated frame beams and the newly-added prefabricated frame columns, and channels are formed in existing frame beams and existing frame columns, and correspond to the channels of the newly-added prefabricated reinforced concrete frame in position; the unbonded prestressed reinforcing steel bars penetrate through the channels, are tensioned, and are anchored through anchoring tools. The seismic capacity of the structure reinforced through the method is improved by 1-2 times.

Description

technical field [0001] A method of prestressing the prefabricated reinforced concrete frame to strengthen the existing structure is to connect the newly added prefabricated reinforced concrete frame used for reinforcement to the original reinforced concrete frame to be reinforced through unbonded prestressed tendons to form a whole and jointly resist Earthquake action belongs to the field of seismic strengthening of reinforced concrete structures in civil engineering. Background technique [0002] In our country, reinforced concrete frame structure and bottom frame structure are widely used because of their convenience and flexibility. The reinforced concrete frame structure and the bottom frame structure have different structural layouts due to different use functions, and it is easy to form a structural system with uneven rigidity and rigid top and soft bottom, and there is a serious hidden danger of insufficient earthquake resistance. With the development of society and ...

AI Technical Summary

Problems solved by technology

The new prefabricated reinforced concrete frame used for reinforcement is assembled to the outside of the existing building frame through unbonded prestressed tendons, which not only gives full play to the advantages of the prefabricated structure, but also solves the problem of assembly connection between the old and new frames, and can be widely used Seismic strengthening of concrete structures

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