Quantification method for adhesive layer degeneration of FRP (Fiber Reinforce Plastic) reinforced steel structure based on antenna sensor

Abstract

The invention relates to the field of FRP (Fiber Reinforce Plastic) reinforced steel structures and discloses a quantification method for adhesive layer degeneration of an FRP (Fiber Reinforce Plastic) reinforced steel structure based on an antenna sensor. The quantification method comprises the following steps: arranging a first rectangular micro-strip patch antenna sensor; sticking FRP into which a second rectangular micro-strip patch antenna sensor is embedded on a steel structure; calculating an initial strain ratio of two antenna sensors; obtaining strain at a middle point in a thickness direction according to a strain transferring equation when an adhesive layer is not degenerated; calculating a detection strain ratio of the two antenna sensors; calculating strain at the middle point in the thickness direction when the adhesive layer is degenerated; obtaining a function relation of damage variables according to a constitutive relation of an ideal adhesive layer elastomer; substituting the strain at the middle point in the thickness direction when the adhesive layer is degenerated into the damage variable function to calculate the damage variables. The device needed by the quantification method is simple, the construction is convenient, the cost is low, the practicability is high, and the method can be directly applied to practical engineering of the FRP reinforced steel structure.

Description

technical field [0001] The invention relates to the field of FRP-reinforced steel structures, in particular to a method for quantifying the degradation of adhesive layers of FRP-reinforced steel structures based on antenna sensors. Background technique [0002] With the development of the economy, the steel structure occupies an increasingly important position in the national economy. A large number of steel structures are used in various industries. In the process of design, manufacture, construction and use, various defects and damages inevitably exist in the steel structure. , Under the action of factors such as load and environment, the microstructure of the steel structure material changes, which deteriorates the macroscopic mechanical properties of the material, resulting in cracks and damage to the steel structure, resulting in engineering accidents. [0003] In order to solve the above problems, FRP (Fiber Reinforced Composite Material) reinforced steel structure tec...

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Problems solved by technology

[0004] The key to the success of the FRP reinforced steel structure technology is to ensure that the adhesive layer between the FRP and the steel structure is well bonded, so that the FRP and the steel structure are jointly stressed as a whole. , oxygen and other corrosive media, performance degradation will occur, resulting in a decrease in strength, which affects the effect of FRP reinforced steel structures, and the existing research mainly focuses on solving the durability of the adhesive layer in harsh environments, and no FRP is involved. Quantification method for the degradation of adhesive layer in reinforced steel structures

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