RANDOMDEC: MATHEMATICAL BACKGROUND AND APPLICATION TO DETECTION OF STRUCTURAL DETERIORATION IN BRIDGES

The application of Randomdec analysis to the detection of flaws in highway bridges is investigated analytically and experimentally. The analytical study shows basic properties of the method including the relationship between the Randomdec signature, the amplitude spectrum and the modal response of the system. The experimental program included a field study on five bridges and a laboratory study on samples with induced fatigue cracks. The bridge work produced results on signature characteristics of different types of structural members and on the detection of structural changes in a bridge under dynamic testing. The laboratory study showed that within the frequency range of 1-10 KHz, crack growth in the range of 0.25 to 0.7 cm can be detected at distances up to about one meter. /FHWA/

  • Corporate Authors:

    Nielsen Engineering and Research Incorporated

    510 Clyde Avenue
    Mountain View, CA  United States  94040

    National Aeronautics and Space Administration

    400 Maryland Avenue, SW
    Washington, DC  United States  20546
  • Authors:
    • Reed Jr, R E
    • Cole Jr, H A
  • Publication Date: 1976-9

Media Info

  • Pagination: 180 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00194751
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-76-181 Final Rpt., FCP 35F1-072
  • Files: TRIS, USDOT
  • Created Date: Aug 15 1979 12:00AM