Refined Load Rating through Rapid Modal Testing

The Targeted Hits for Modal Parameter Estimation and Rating (THMPER) system is a rapid modal impact trailer, a mobile work station, and streamlined data processing software that is used to extract modal parameters (natural frequencies and global mode shapes) of highway bridges during brief traffic slow downs or partial lane closures. The modal testing trailer is comprised of a Falling Weight Deflectometer (FWD) that was significantly reconfigured to (1) provide a single, large (~30kip) broadband impact source, and (2) collect the resulting free-decay response of the bridge's surface both locally (at the impact location) and globally (via wireless, global positioning system (GPS) synchronized stationary sensors installed along available sidewalks/shoulders out of the way of traffic). Once collected, the data is ported to a semi-automated modal processing software which performs (1) data quality checks, (2) frequency response function development, and (3) modal parameter estimation. The proposed research aims to validate this emerging technology using a typical highway bridge as a test specimen through a three tiered comparison with current ‘best practices’ approaches. First, the THMPER system’s effectiveness as a modal testing approach will be assessed through a comparison of modal parameters obtained from a conventional modal test. Second, a finite element model calibration will be performed and compared using results from the THMPER system and from a conventional truck load test. Finally, an Load and Resistance Factor Rating will be obtained from each finite element model and compared.

Language

  • English

Project

  • Status: Active
  • Funding: $ 38039
  • Contract Numbers:

    DTRT13-G-UTC28

    CAIT-UTC-NC50

  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    Center for Advanced Infrastructure and Transportation

    Rutgers University
    100 Brett Road
    Piscataway, NJ  United States  08854-8058

    New Jersey Department of Transportation

    1035 Parkway Avenue
    Trenton, NJ  United States  08625
  • Project Managers:

    Szary, Patrick

    Kasbekar, Nagnath

  • Performing Organizations:

    Center for Advanced Infrastructure and Transportation

    Rutgers University
    100 Brett Road
    Piscataway, NJ  United States  08854-8058
  • Principal Investigators:

    Moon, Franklin

  • Start Date: 20170601
  • Expected Completion Date: 20180831
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers

Subject/Index Terms

Filing Info

  • Accession Number: 01677597
  • Record Type: Research project
  • Source Agency: Center for Advanced Infrastructure and Transportation
  • Contract Numbers: DTRT13-G-UTC28, CAIT-UTC-NC50
  • Files: UTC, RiP
  • Created Date: Aug 10 2018 12:18PM