Thermal Strain Detection for Concrete Structure Cold Shrinkage under Stress Constraint with FBG
Abstract
:1. Introduction
2. Principle of Thermal Strain Detection for Concrete Structures under Stress Confinement with FBG
3. Experimental Setup and Methods
4. Analysis of Experimental Results
4.1. Applied Stress-Strain Analysis of the Structure under Radial Pressure
4.2. State Analysis of FBG in Structural Strain Detection
4.3. Extraction of Structural Thermal Strain
4.4. Calculation of the Coefficient of Thermal Expansion of the Structure
5. Conclusions
- The central wavelength of the FBG for temperature compensation is only modulated by temperature. Thus, the center wavelength of the grating is stabilized rapidly with temperature changes in the experimental chamber. The central wavelength of the FBG strain sensors is modulated by both temperature and structural strain. There is a time delay for the concrete structure temperature to reach the experiment’s preset temperature. Thus, the center wavelength of the FBG strain sensors takes a certain amount of time to reach stability.
- The thermal strain of the concrete structure gradually increases with decreasing temperature. In the temperature range of , the thermal strain of the structure subjected to the stress constraint decreases significantly compared to the free thermal strain. In addition, the thermal strain decrease with increasing stress at the same temperature point. Under the experimental conditions of and 3000 N radial pressure, the greatest reduction in thermal strain is observed at the two detected points, by and , respectively.
- The difference between the thermal strain under stress constraint and the free thermal strain decreases as the temperature decreases. In addition, the higher the tensile stress, the smaller the thermal strain at the same temperature point.
- In the temperature range of , the free thermal expansion coefficient of concrete structures fluctuates around , with a tendency to increase and then decrease. The thermal expansion coefficient of concrete under tensile stress conditions is significantly reduced compared to the free thermal expansion coefficient. This difference is maximum at and then decreases with decreasing temperature. Under the experimental conditions of and 3000 N radial pressure, the thermal expansion coefficients for the two tested points were and , respectively.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Measurement Range | Measurement Accuracy | Sampling Frequency | Operating Temperature | Relative Humidity |
---|---|---|---|---|
0–5000 N | 80 Times/s | CC | ≤85% RH |
N | N | N | N | |
---|---|---|---|---|
Detection point 1 | ||||
Detection point 1 |
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Yang, L.; Li, C.; Luo, C. Thermal Strain Detection for Concrete Structure Cold Shrinkage under Stress Constraint with FBG. Sensors 2022, 22, 9660. https://doi.org/10.3390/s22249660
Yang L, Li C, Luo C. Thermal Strain Detection for Concrete Structure Cold Shrinkage under Stress Constraint with FBG. Sensors. 2022; 22(24):9660. https://doi.org/10.3390/s22249660
Chicago/Turabian StyleYang, Lubing, Chuan Li, and Chuan Luo. 2022. "Thermal Strain Detection for Concrete Structure Cold Shrinkage under Stress Constraint with FBG" Sensors 22, no. 24: 9660. https://doi.org/10.3390/s22249660
APA StyleYang, L., Li, C., & Luo, C. (2022). Thermal Strain Detection for Concrete Structure Cold Shrinkage under Stress Constraint with FBG. Sensors, 22(24), 9660. https://doi.org/10.3390/s22249660