Unknown foundation determination for scour.

Details

• Creators:
  Briaud, Jean-Louis ; Medina-Cetina, Zenon ; Hurlebaus, Stefan ; Everett, Mark ; Tucker, Stacey ; Yousefpour, Negin ; Arjwech, Rungroj
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Scour
  • Deterioration by environmental action
  • Foundation soils
  • Bridges
  • Scour at bridges--Texas
• Publication/ Report Number:
  FHWA/TX-12/0-6604-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Oct. 2011-Apr. 2012.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  Unknown foundations affect about 9,000 bridges in Texas. For bridges over rivers, this creates a problem ; regarding scour decisions as the calculated scour depth cannot be compared to the foundation depth, and a ; very conservative costly approach must be taken. The objective was to develop a global approach, which ; will reduce significantly the level of uncertainty associated with unknown foundations. This approach was ; developed in two parts: a data mining and inference approach where no testing at the site was necessary, and ; a testing approach where new tests for unknown foundations were used. The data mining and inference task ; made use of existing data such as soil type, known foundations on neighboring bridges, design practice, and ; the age of the bridge to infer the type and length of unknown foundation elements. The testing task consisted ; of developing two geophysical techniques, resistivity and induced polarization imaging, to obtain a picture of ; the soil and foundation below the surface level or river bottom. The outcome was a global framework in ; which one of the approaches or any combination thereof, as well as the most useful current techniques ; (nondestructive testing methods if necessary), can be used to decrease dramatically the uncertainty associated ; with the unknown foundation. The inference process was trained by using bridges where the foundation was ; known and verified by comparison against case histories. The two testing techniques mentioned above were ; tested at the National Geotechnical Testing Site on Texas A&M's Riverside campus and then against ; full-scale bridges selected in cooperation with TxDOT.
  More +
• Format:
  PDF
• Funding:
  Project 0-6604
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24257/dot_24257_DS1.pdf
• File Type:
  [PDF - 24.26 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:9cd51bbb2c6c1097124a48bf8f38708bd0736cdcd1e24f470f5e98ddce896c8c9c7712da747559be3be772490ad0d7286bd98f76478b0273a29d158e0a4894ef