Construction method for corrosion degree and mechanical property degradation law model based on electrochemical signal of stressed steel bar

Abstract

The invention discloses a construction method for a corrosion degree and mechanical property degradation law model based on an electrochemical signal of a stressed steel bar. The construction method comprises the steps that a to-be-processed steel bar is installed on a stress frame designed in the early stage, and a certain tensile stress is applied to the steel bar by an assistor; then under thestate with the tensile stress, the to-be-processed steel bar is put into a corrosive fluid for corrosion, and an electrochemical signal is collected; based on the collected electrochemical signal, combined with the existing calculation model of a non-stressed steel bar, two correction factors, namely DZ and HBH are added, the corrosion degree of the stressed steel bar is calculated, wherein DZ isthe correction coefficient after applying force, and HBH is the correction coefficient of the original crack state; and mechanical property indexes are measured according to different corrosion degrees, and a mechanical property degradation law DZ-HBH model based on the electrochemical signal is constructed. The original crack propagation mechanism of the steel bar itself may be correctly predicted, and a reasonable explanation on the instantaneous fracture mechanism is given.

Description

technical field [0001] The invention relates to the technical field of bridge durability prediction, in particular to a method for constructing a corrosion degree and mechanical performance degradation law model based on electrochemical signals of stressed steel bars. Background technique [0002] Predicting the durability of bridges is a difficult problem in the world. Because the steel bars of bridges are affected by various harsh environments in actual use, these factors make bridge steel bars susceptible to corrosion. In this case, the long-term corrosion will cause the concrete structure to crack, and in the worst case, the bridge will break and collapse, causing casualties and property losses. Therefore, it is imperative to predict the durability and even the remaining life of bridges by detecting the corrosion degree of bridge steel bars. [0003] The calculation model constructed by the existing technology is the corrosion degree and mechanical property degradation ...

AI Technical Summary

Problems solved by technology

[0003] The calculation model constructed by the existing technology is the corrosion degree and mechanical property degradation law of the unstressed steel bar, which only considers the influence of the external factors of the steel bar on the corrosion, and does not consider the force problem of the steel bar itself and the expansion of the original crack. The constructed models are almost all in the unstressed state, without considering the correction factor of the reinforced steel stress, which is quite different from the actual bridge

Images