Health Monitoring of Rehabilitated Concrete Bridges Using Distributed Optical Fiber Sensing

Health monitoring systems (HMS) can reduce the inspection and maintenance cost of existing highway bridges by identifying structural deficiencies at an early stage and verifying the efficacy of repair procedures. This paper investigates the use of two types of distributed optical fiber sensing (DOFS), namely fiber Bragg grating (FBG) and Brillouin optical time domain reflectometry (BOTDR), into an integrated HMS for rehabilitated reinforced concrete (RC) girder bridges. A series of static and dynamic loading tests were applied to a simply supported RC T-beam strengthened by externally post-tensioned aramid fiber reinforced polymer tendons. Before the loading tests, a calibration test for FBG and another one for BOTDR were implemented to obtain good linearity for both of them. Monitoring data were collected in real time during the process of external strengthening, static loading, and dynamic loading, all of which well identified the relevant structural state. The beam was vibrated for 2 million cycles and then loaded monotonously to failure. Based on the bending strength of externally prestressed members, ultimate values for the test specimen were numerically computed via a newly developed simplified model, which satisfactorily predicted the ultimate structural state of the beam. The alert values were then adopted to compare with the monitoring results for safety alarm. The results indicate that the HMS with both DOFS systems is efficient and applicable for rehabilitated RC concrete bridges.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/10939687
• Authors:
  • Zhang, Wei
  • Gao, Junqi
  • Shi, Bin
  • Cui, Heliang
  • Zhu, Hong
• Publication Date: 2006-8

Language

• English

Media Info

• Media Type: Print
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 411-424
• Serial:
  • Computer-Aided Civil and Infrastructure Engineering
  • Volume: 21
  • Issue Number: 6
  • Publisher: Blackwell Publishing
  • ISSN: 1093-9687
  • Serial URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1467-8667

Subject/Index Terms

• TRT Terms: Calibration; Dynamic tests; Fiber optics; Fiber reinforced plastics; Flexural strength; Girder bridges; Highway bridges; Load tests; Mathematical models; Monitoring; Prestressing; Real time information; Rehabilitation; Reinforced concrete bridges; Sensors; Static tests; Structural health monitoring; Structural strengthening; T beams; Vibration
• Uncontrolled Terms: External prestressing
• Subject Areas: Bridges and other structures; Design; Highways; Maintenance and Preservation; I24: Design of Bridges and Retaining Walls; I60: Maintenance;

Filing Info

• Accession Number: 01029144
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 21 2006 2:33PM