Installation of Thermocouples, and Analysis of Temperature Data from the 21st South Bridge

Structural health monitoring is to determine the condition of a bridge based on instrument measurements. The C-846 Bridge in Salt Lake City has such instrumentation. The bridge is located in Salt Lake City at about 2100 South and Interstate 15. This bridge has two kinds of instruments on it: accelerometers and thermocouples. The accelerometers measure the vibrations of the bridge. The accelerometers have been recording data on the bridge since 2001. The thermocouples, which measure temperature, were added as part of this installation in April 2016. In light of recent research, damage may be detected from measuring the change in the natural frequency of a bridge, which can be obtained by manipulating the accelerometer data. However, the natural frequencies of a bridge change due to environmental effects, especially temperature. Temperature effects must be accounted for in order to better understand the damage. The purpose of this research is not to detect damage. The bridge that is being monitored does not have any damage. The purpose of this study is to show how the dynamic properties of the C-846 Bridge in South Salt Lake City correlate with temperature. Additionally, several frequencies including the fundamental frequency of the bridge are identified. It was found that the natural frequencies of the bridge increase with a decrease in temperature, and that the fundamental frequency of the bridge is 1.15 Hz.

  • Record URL:
  • Supplemental Notes:
    • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
  • Corporate Authors:

    Utah State University, Logan

    Department of Civil and Environmental Engineering, 4110 Old Main Hill
    Logan, UT  United States  84322-4110

    Rutgers University, Piscataway

    Center for Advanced Infrastructure and Transportation, 100 Brett Road
    Piscataway, NJ  United States  08854-8058

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Authors:
    • Nichols, Gilbert A
    • Halling, Marvin W
    • Barr, Paul J
  • Publication Date: 2018-8


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 109p

Subject/Index Terms

Filing Info

  • Accession Number: 01714502
  • Record Type: Publication
  • Report/Paper Numbers: CAIT-UTC-NC33
  • Contract Numbers: DTRT13-G-UTC28
  • Created Date: Aug 9 2019 12:47PM