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Corporate Contributors:United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. Federal Highway Administration ; New Jersey. Dept. of Transportation
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Edition:Final report, 6/1/2017 – 9/30/2017
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Abstract:A new rapid modal testing platform and method was demonstrated and validated via comparison to conventional experimental and analytical approaches. The Targeted Hits for Modal Parameter Estimation Rating (THMPER) system is a rapid modal impact trailer, a mobile work station, and streamlined data processing software which aims to address the current lack of cost-effective methods to perform refined load rating analysis of bridges. The validation effort used a typical highway bridge as a test specimen and consisted of a multi-tiered comparison with current ‘best practices’ approaches. The THMPER system’s effectiveness as a modal testing approach was assessed through a comparison of modal parameters obtained from an ambient vibration monitoring effort. Natural frequency estimations showed good agreement between the two dynamic test methods. Comparison of THMPER to a conventional static test was performed via independent finite element model calibrations using the natural frequencies and mode shapes estimated by the THMPER system and the strains observed during a truck load test. The updated parameters of both model calibrations showed similar behavior. Comparing the calibration results to a priori values, both calibrations resulted in (1) an increase of girder and deck stiffness, (2) active diaphragms and barriers (e.g. non-trivial stiffness), (3) longitudinal stiffness at expansion bearings, (4) longitudinal release of the ‘fixed’ bearing above the center pier. In general, the discrepancies between the experimental observations and the predictions made by the a priori FE model indicate that the available design plans are not representative of the structure. The a priori model either lacks a significant amount of stiffness or has too much mass. Nevertheless, the “final” parameters from each calibration were relatively consistent in behavior indicating that both the THMPER system and truck load testing experimental approaches provide similar, useful information about the structure.
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