Method for strengthening reinforced concrete columns with enlarged cross section of self-compacting concrete with jacket frp-steel composite pipe

Abstract

The invention provides a method for reinforcing a reinforced concrete column by enlarging the section of self-compacting concrete sleeved with an FRP-steel composite pipe, and relates to a structure reinforcing technology in the field of civil and architectural engineering. The method comprises the following steps: (1) construction preparation; (2) treatment of the surface of the existing reinforced concrete column; (3) sleeving of the steel pipe; (4) pasting of an FRP cloth; and (5) concrete pouring. According to the method, the bearing capacity and the rigidity of the reinforced concrete column which is reinforced can be improved remarkably, the ductility of the reinforced concrete column is improved, the plasticity and toughness of the concrete column are improved, operation is easy, construction is rapid, the engineering cost is low, and the method has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of civil construction engineering, in particular to a method for reinforcing a reinforced concrete column with an enlarged cross-section of self-compacting concrete of an outer FRP-steel composite pipe. Background technique [0002] A large number of existing reinforced concrete structures are in urgent need of reinforcement due to a series of reasons such as improper design and use, environmental erosion, changes in use functions, and increased code requirements. The column is the most important longitudinal member in the reinforced concrete structure, which plays a decisive role in the mechanical performance of the whole structure, so the reinforcement of the existing column is particularly important. [0003] At present, in the reinforcement of reinforced concrete columns, the commonly used methods mainly include the enlarged section method and the outsourcing steel method. All of them can improve the be...

AI Technical Summary

Problems solved by technology

They can all improve the bearing capacity of concrete columns to a certain extent and achieve the purpose of reinforcement, but they have obvious limitations.

The new and old concrete of the column reinforced by the enlarged cross-section method has poor joint performance, and basically cannot improve the ductility of the column, and there are too many wet operations on site, and the formwork support is cumbersome; Can not work as a whole, each other can only bear the force separately, the utilization rate of the outsourcing steel material is low, and the integrity is poor; the integrity of the wet outsourcing steel method is also not good, and due to the use of structural adhesive, the durability and fire resistance of the reinforced column Both are poor, and the bearing capacity, stiffness and ductility of the reinforced column cannot be greatly improved at the same time.

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