Methodology for Load Rating Double-Tee Bridges [SDOT]
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2019-05-23
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Corporate Contributors:South Dakota. Department of Transportation. Office of Research ; United States. Department of Transportation. Federal Highway Administration ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; Mountain-Plains Consortium
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Edition:Final Report Jan. 2016 – May 2019
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Abstract:The most common type of bridge on South Dakota local roads is a precast prestressed double-tee (DT) girder bridge. More than 700 DT bridges are currently in-service in South Dakota. Structural detailing, aging, traffic volume, and environmental conditions affect the structural performance, integrity, and capacity of DT bridges. When a bridge is affected by one or more of the aforementioned parameter(s), the estimation of the bridge safe live load is necessary to ensure the safety of the traveling public and to prevent excessive bridge damage and collapse. Load rating of damaged bridges is challenging mainly because of a lack of information regarding the capacity and live load distribution of damaged components. In the present study, quantitative definitions were first proposed to identify all damage types and condition states specific to double-tee girders. Subsequently, more than 370 inspection reports on South Dakota double-tee girder bridges were reviewed to determine the frequency of damage types and condition states, bridge span length, bridge number of spans, girder depth, and bridge skew conditions.
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