Research notes : capacity of aging bent caps.
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Research notes : capacity of aging bent caps.

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  • Alternative Title:
    Capacity of aging bent caps.
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  • Abstract:
    Many conventionally reinforced concrete deck girder (RCDG) bridges were built in the United States during the construction of the interstate highway system in the 1950s. Designs followed the AASHO standard of the time, which were less stringent than current specifications. As a result of vintage design combined with increased traffic volumes and heavier truck loads, many of the interstate-era bridges exhibit cracking of the main girders and the short, deep beams called bent caps that support the girders. The implication of cracked girders was addressed in previous ODOT research, but the results of that research were not directly applicable to bent caps due to the dimensional differences between the two types of beams. Consequently, ODOT contracted with Oregon State University to investigate methods for estimating the capacity of cracked bent caps.

    The research evaluated several methods for predicting the capacity of bent caps by comparing the calculated values with measured capacities of the test bent caps. Though computer modeling provided the most accurate prediction, a simpler method that does not require specialized modeling skills was recommended. A spreadsheet application was developed to perform the calculations, and an example load rating was conducted.

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