United States Department of Transportation
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures
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Abstract:The project presents protocols for evaluation of existing bridges. The first part of project is focused on review of analytical methods of bridge rating. The second part is devoted to field-testing procedures, which are presented and described. The protocols include description of the required equipment and operational guides. The document also includes the assessment of accuracy, potential problems, and best practice observations. The field tests include the measurement of strain and deflection, with the objective of determining/verifying girder distribution factor, and minimum load carrying capacity. Field-testing is applied to pre-selected representative structural types and materials, so that the obtained results can be applied to a wider population of bridges. Field-testing involves instrumentation using strain gages (wireless transducers)and linear variable differential transformers (LVDT’s), signal nodes and signal receiver, STS VIEW computer software to record test data and a power generator. The test load is considered in the form of test trucks. The developed protocols are demonstrated on three selected bridges. The structures were selected in cooperation with the Nebraska Department of Roads (NDOR). Performed field tests were diagnostic type to verify the live load distribution factors (GDF) and proof load test to find the minimum load carrying capacity.
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Content Notes:Performing Organization Report No.: 25-1121-0003-209; Sponsoring Agency Code:MATC TRB RiP No. 34760
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