Remote monitoring of fatigue-sensitive details on bridges : [part I and II].

Details

• Creators:
  Attanayake, Upul ; Aktan, Haluk ; Hay, Robert ; Catbas, Necati
• Corporate Creators:
  Western Michigan University. Dept. of Civil and Construction Engineering
• Subject/TRT Terms:
  • Steel bridges
  • Fatigue (Mechanics)
  • Remote sensing
  • Structural health monitoring
  • Acoustic emission
  • Waveform analysis
  • Finite element method
  • Cluster analysis
• Publication/ Report Number:
  RC-1629
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Michigan. Dept. of Transportation. Office of Research Administration
• Abstract:
  Fatigue is one of the most critical problems for steel bridges as well as for any steel structures that needs ; to be considered during design and operation. The objectives of this study are to explore monitoring ; technologies, and to develop effective structural and data analysis strategies as well as implementation ; recommendations for evaluating performance of fatigue-sensitive details and retrofits in steel bridges. ; Acoustic emission (AE) was selected as a candidate inspection technology, and a monitoring system was ; installed on a bridge. In general, the performance of the monitoring system and associated software is ; satisfactory. The majority of AE monitoring challenges are associated with AE data analysis and ; interpretation of results. In this study, cluster analysis and non-linear mapping signal analysis techniques ; are used to group AE data with similar waveform characteristics. The presence of the signals that ; resemble the characteristics of crack opening signals, noise, and structural resonance is identified through ; waveform analysis. Once the presence of crack opening signals is confirmed, the source location plots ; are utilized to assess the concentration and the level of activity at the locations of interest. ; A significant difference is observed in the fatigue life calculated using measured stress, and the stresses ; calculated using finite element models loaded with a fatigue truck. Hence, a two-tier implementation ; process is recommended. Tier I process includes the assessment of bridges with repaired details. Tier II ; process recommends evaluating the entire bridge population with fatigue-sensitive details. Additional ; recommendations include implementing AE data interpretation capability in an on-line system to provide ; reliable input with minimal interpretation requirements for inspection-based maintenance management.
  More +
• Format:
  PDF
• Alternate URL:
  http://ntl.bts.gov/lib/54000/54900/54956/RC1629_Part_II_486744_7.pdf ; http://ntl.bts.gov/lib/54000/54900/54956/RC1629_Appendices_486745_7.pdf
• Funding:
  2010-0297
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28786/dot_28786_DS1.pdf
• File Type:
  [PDF - 6.28 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:8d286bc8b421971766aedeab556c396b718748eef97796955ccf83478f5a6352