Monitoring bridge scour using fiber optic sensors.

Details

• Creators:
  Cai, C.S. ; Kong, Xuan ; Xiong, Wen ; Hou, Shuang
• Corporate Creators:
  Louisiana State University. Dept. of Civil and Environmental Engineering
• Corporate Contributors:
  Louisiana Transportation Research Center ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridge foundations
  • Scour
  • Structural health monitoring
  • Fiber optics
  • Sensors
  • Instrumentation
  • Laboratory tests
• Publication/ Report Number:
  FHWA/LA.10/535 ; LTRC Project Number: 08-2ST ; State Project Number: 736-99-1573
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  The scouring process excavates and carries away materials from the bed and banks of streams, and from ; around the piers and abutments of bridges. Scour undermines bridges and may cause bridge failures due to ; structural instability. In the last 30 years, more than 1,000 bridges collapsed in the US and about 60% of the ; failures are related to the scour of bridge foundations. Due to the difficulty in inspecting bridge scour, scourinduced ; failures tend to occur suddenly without prior warning or signs of distress to the structures. Owing to ; the threat of hurricane-induced flooding and the fact that there are a significant number of coastal and ; river/bayou bridges in Louisiana, a more reliable inspection and monitoring procedure for bridge scour is ; needed. ; This proposed study is to develop bridge scour monitoring techniques using fiber optic sensors. Based on ; theoretical and numerical studies, a few mechanisms were proposed for foundation scour monitoring and ; verified in laboratory tests. In order to apply those mechanisms to field bridges, three instrumentations were ; designed and tested, and one design was selected for field applications. According to the selected design, ; two 18-ft long piles with Fiber Bragg Grating (FBG) sensors were then fabricated, transported, and installed ; besides the foundation of the field bridge. Finally, the long-term monitoring was conducted to evaluate the ; foundation scour condition.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/22288/dot_22288_DS1.pdf
• File Type:
  [PDF - 7.87 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:e9b78992abcf42f61f75019a91e3abc156b700818acc928d018f69509d20457097c8b5aae69b711d6145e6bc260a73a669d7e6bdab9c6cd6c219c90cc0026510