Study on Fiber Bragg Grating Monitoring Technique and its Application in Bridge Strengthening

Abstract:

In engineering structures, it is a new approach to evaluate the structural health situation by use of optic fiber sensor. In this paper, a standard specimen beam, 200mm×300mm×3000mm, is chosen and the comparative experiment is executed for strain testing by FBG sensors and vibrating wire sensors which were widely used in bridge health monitoring. Experimental results show that the FBG sensors have a higher measurement precision, higher linearity and better noise resistance. Then we use traditional electrical resistance strain gage to calibrate the FBG sensors and obtain the strain degree of sensitivity, and apply them into bridge strengthening in the Wuhuang Highway in order to collect the strains of reinforcement bar in the deck pavement and the beams before and after the bridge strengthening. The above work is also to evaluate the effects of strengthening projects and carry out long-term structural health monitoring. The monitoring results show that the safety condition can be monitored conveniently with the FBG sensors testing system whose durability and stability can satisfy the need of bridge health monitoring. Finally, we also discuss the key problems and practical approaches in structural health monitoring process by use of embedded FBG sensors.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 5465-5469
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.5465
• Online since: May 2011
• Authors: Zhi Gang Ren, Chang Wu Xu, Er Lei Wang
• Keywords: Bridge Strengthening, Fiber Bragg Grating (FBG), Health Monitoring

References

[1] R. Willsch, "Application of Optical Fiber Sensor: Technical and Market Trends", Proc. of the SPIE/EOS Symposium on Applied Photonics, Glasgow, Scotland, UK, 22-24 May, 2000.

[2] P. M. Nellen, P. Anderegg, R. Broennimann, U. J. Sennhauser, "Application of Fiber Optical and Resistance Strain Gauges for Long-Term Surveillance of Civil Engineering Structure", Proc. SPIE, San Diego, CA, USA,5-6 March,1997.

DOI: 10.1117/12.274633

[3] Jinping Ou, Zhi Zhou, Zhanjun Wu, "Application of FBG Sensors in Heilongjiang Hulan River Bridge", China & Japan Conference Reducing Structural Vibration and Health Monitoring and 3th China Anti-vibration Control Conference, Shanghai, China, 8-10 December, 2002.

[4] Junqing Gong, Qingrui Yue, Jiakun Zhang, "Application for the Inspecting Technology of Fiber Bragg Grating in Large Scaled Crane Beam", China & Japan Conference Reducing Structural Vibration and Health Monitoring and 3th China Anti-vibration Control Conference, Shanghai, China, 8-10 December, 2002.

[5] Zhean Lu, Zhixue Jiang, Yuhua Shi, Ji Wang, "The Application Study of FBG Sensing Technology in Bridge Monitoring", Journal of Wuhan University of Technology, Vol. 25,Issue 11, 57-59,2003. (In Chinese)

[6] Zhixue Jiang, "The Application Study on Concrete Bridge FBG Monitoring and Composite Pavement Structure" [Thesis], Wuhan University of Technology, Wuhan, China, 2003. (In Chinese)