Method for realizing crack resistance of concrete beam member by optimizing ribbed FRP bars

Abstract

The invention discloses a method for realizing crack resistance of a concrete beam member by optimizing ribbed FRP bars. The method comprises the steps of optimizing, manufacturing of a beam template,assembling of a mixed reinforcement cage and forming, the concrete beam member is reinforced by adopting the mixed reinforcement of the FRP bars and reinforcing bars, compared with single reinforcingbar reinforcement, the characteristics of high tensile strength and corrosion resistance of the FRP bars and good ductility of common reinforcing bars are sufficiently utilized, mutual complementation is realized, the defects of large deflection and crack width and insufficient ductility of the FRP reinforced concrete flexural member are overcome, the FRP bars are configured to the easy-to-corrode corner of the concrete beam member, the problem of steel bar corrosion of the reinforced concrete beam member and the defects of large deflection, wide cracks and brittle failure of the FRP reinforced concrete beam member are solved, the FRP bars are optimized, the problems that the bonding stress of the common ribbed FRP bars and concrete is small, bonding sliding performance is poor, the crackwidth cannot be effectively controlled are solved, and steel bars on the inner side are still likely to corrode are solved, the construction method is flexible, and both factory prefabrication and in-place casting can be realized.

Description

technical field [0001] The invention relates to the technical field of civil structural engineering, in particular to a method for realizing crack resistance of concrete beam members by optimizing ribbed FRP bars. Background technique [0002] At present, bridge structures are facing a major problem in harsh environments such as ocean, humidity, and saline-alkali land, that is, corrosion of steel bars. Corrosion of steel bars is the main reason for the deterioration of concrete components such as concrete box girders, concrete piers, and concrete piles in harsh environments. The reason is that fiber reinforced composites (FRP) have the advantages of light weight, high strength, corrosion resistance and fatigue resistance, and have received more and more attention in the field of civil engineering. At the same time, due to the low elastic modulus of FRP tendons, FRP Reinforced concrete beams show greater deformation, and the crack width is large, the crack spacing is relative...

AI Technical Summary

Problems solved by technology

[0002] At present, bridge structures are facing a major problem in harsh environments such as ocean, humidity, and saline-alkali land, that is, corrosion of steel bars. Corrosion of steel bars is the main reason for the deterioration of concrete components such as concrete box girders, concrete piers, and concrete piles in harsh environments. The reason is that fiber reinforced composites (FRP) have the advantages of light weight, high strength, corrosion resistance and fatigue resistance, and have received more and more attention in the field of civil engineering. At the same time, due to the low elastic modulus of FRP tendons, FRP Reinforced concrete beams show greater deformation, and the crack width is large, the crack spacing is relatively large, and the number of cracks is small. The failure mode of the beam in the bending state is brittle failure, there is no plastic deformation stage, the ductility is poor, the elongation is low, and there is no obvious deformation sign before failure, so there is an urgent need for a crack-resistant concrete beam member by optimizing the ribbed FRP reinforcement method to solve the above problems

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