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...

Examples

Embodiment Construction

[0026] like figure 1 As shown, 1a is the strain sensing fiber, and 1b is the temperature compensation fiber, which are evenly arranged on the side and upper surface of the test block in an S-shape. When laying, the sensing fiber should be close to the surface of the test block. The strain-sensing optical fiber 1a is pre-stretched and laid in the pre-carved groove on the surface of the steel bar 2, and the temperature-compensating optical fiber 1b is placed naturally without applying force. A certain length should be reserved at the beginning of the laid sensing optical fiber, so that it can be led out and connected to the data acquisition instrument in the later test, and the optical fiber connection is reinforced and protected with a thermal expansion tube. 2 is the steel bar; 3 is the armored sheath, which protects the bending of the optical fiber; 4 is the 1m x 1m x 1m concrete test block, which is used as the carrier of the corrosion of the steel bar; 5 is the optical fibe...

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...

Examples

Embodiment Construction

[0026] like figure 1 As shown, 1a is the strain sensing fiber, and 1b is the temperature compensation fiber, which are evenly arranged on the side and upper surface of the test block in an S-shape. When laying, the sensing fiber should be close to the surface of the test block. The strain-sensing optical fiber 1a is pre-stretched and laid in the pre-carved groove on the surface of the steel bar 2, and the temperature-compensating optical fiber 1b is placed naturally without applying force. A certain length should be reserved at the beginning of the laid sensing optical fiber, so that it can be led out and connected to the data acquisition instrument in the later test, and the optical fiber connection is reinforced and protected with a thermal expansion tube. 2 is the steel bar; 3 is the armored sheath, which protects the bending of the optical fiber; 4 is the 1m x 1m x 1m concrete test block, which is used as the carrier of the corrosion of the steel bar; 5 is the optical fibe...

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