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Ultrasonic detection of simulated corrosion in 1 inch diameter steel tieback rods.

File Language:
English


Details

  • Creators:
    Olsen, Karl ; Pollock, David
  • Corporate Creators:
    Transportation Northwest Regional Center X (TransNow) (UTC)
  • Corporate Contributors:
    United States. Department of Transportation. Office of the Secretary ; Washington State University. Department of Civil and Environmental Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    TNW2009-07
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Washington
  • Edition:
    Final research report.
  • Corporate Publisher:
    Transportation Northwest (TransNow) UTC
  • Abstract:
    Corrosion of tieback rods in sheet piling systems can compromise the reliability of associated transportation ; structures due to loss of cross‐section and reduced strength of the tieback rods. Common inspection techniques ; currently involve excavating to the location of a few tieback rods for visual appraisal. This process is typically ; expensive and labor‐intensive. Furthermore, the actual condition of the vast majority of tieback rods in a sheet piling ; system remains unknown, since only a few tieback rods are typically inspected. Ultrasonic inspection of tieback rods ; will provide a more comprehensive technique for detecting loss of cross‐section associated with corrosion. Ultrasonic ; inspection is already used to successfully detect fracture of anchor bolts in transportation sign structures by coupling ; ultrasonic transducers to one end of an anchor bolt and propagating a bulk wave along the bolt length. The proposed ; research regarding tieback rods will involve similar propagation of bulk ultrasonic waves at the exposed end of a ; tieback rod. However, instead of looking for “early echoes” in the signal associated with cracks or fracture, the portion ; of the ultrasonic signal following the back wall echo will be investigated for evidence of loss of cross‐section due to ; corrosion. These signal indicators will be correlated to actual variations in cross‐section dimensions, in order to ; estimate the residual capacity of corroded tieback rods. The development of an effective ultrasonic technique for ; inspecting tieback rods in sheet piling systems has the potential to save money by avoiding the costs of periodic ; excavation. Furthermore, an efficient ultrasonic inspection technique will improve safety and structural reliability by ; facilitating condition assessment of every tieback rod in a sheet piling system.
  • Format:
    PDF
  • Funding:
    DTRS99-G-0010
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/17240/dot_17240_DS1.pdf
  • File Type:
    Filetype[PDF - 3.85 MB]
  • Collection(s):
    University Transportation Centers ; US Transportation Collection
  • Main Document Checksum:
    urn:sha256:2acb26af7888f17db020b1ff2c67d34e9297f1194d36a187d530819718bbefac
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