OFDR technology based steel bar corrosion deformation monitoring system and using method thereof

Abstract

The invention discloses an OFDR technology based steel bar corrosion deformation monitoring system and a using method thereof. The monitoring system comprises a strain sensing fiber and a temperaturecompensation fiber which are laid on a groove of a steel bar and a surface of a test block, an optical fiber data acquisition and transmission system, and an optical fiber processing and analysis system and a monitoring result display system; when the optical fibers are laid, the S-type layout is adopted on the surface of the reinforced concrete test block, and the strain sensing fiber is arrangedadjacent to the temperature compensation fiber in parallel; the strain sensing fiber is pre-stressed and straightened on the surface of the steel bar and is arranged adjacent to the temperature compensation fiber in parallel. Compared with the prior art, the monitoring system has the advantages of high measurement precision, high efficiency, strong flexibility, simple operation, etc., and can monitor the surface strain of the test block and the steel bar caused by steel bar corrosion in real time, thereby obtaining the deformation caused by steel bar corrosion and realizing high precision measurement of steel bar corrosion deformation.

Description

technical field [0001] The invention relates to the field of civil engineering testing, in particular to a steel bar corrosion and deformation monitoring system based on OFDR technology and a use method. Background technique [0002] With the rapid development of construction technology, the durability of reinforced concrete structures has attracted more and more attention. Corrosion of steel bars will reduce the bonding force between steel bars and concrete, and at the same time cause tensile cracking of concrete, which becomes an important reason for the durability damage of reinforced concrete structures. At present, electrochemical methods are often used to study the corrosion process of steel bars. How to conveniently and effectively monitor the deformation of steel bars and concrete during the corrosion process has become a difficult point. Deformation monitoring is an important aspect of corrosion testing. At present, traditional methods such as resistive strain gaug...

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Problems solved by technology

Deformation monitoring is an important aspect of corrosion testing. At present, traditional methods such as resistive strain gauges and crack width gauges are mainly used. These methods have the following shortcomings: (1) Most of them are point sensors, which can only collect limited data , easy to miss detection, low efficiency, and unable to fully reflect the deformation characteristics of the monitoring object; (2) information feedback is lagging, which brings time errors, and the later data processing is not intelligent enough; (3) the layout of measuring points is cumbersome, and the measurement The point survival rate is low, which often affects the monitoring progress; (4) the measurement accuracy of the instrument is low, and it is difficult to obtain subtle changes in the monitoring object; (5) with a large number of leads, it is difficult to monitor internal deformation

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