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- W560866929 abstract "The report discusses testing and load rating of the bridge carrying Dean’s Mill Road over the Hannacrois Creek in Greene County, New York (County Bridge BIN 3201350). The bridge was built in 1961, and consists of five 70-ft long post-tensioned bulb-T beams connected by 8-in. wide closure pours. No documents or plans for the structure are available. The bridge deck is topped with an asphalt overlay for a riding surface. It is a single span structure, has two traffic lanes, and an AADT of approximately 650 vehicles. In 1970, the structure was load posted for 12 tons. Absence of the bridge plans discouraged the County Engineers’ evaluation of the structure to increase the 12 ton posting. Pressed by the public’s demand to accommodate school bus traffic on the bridge, the County approached the New York State Department of Transportation (NYSDOT) on how to respond to the pressing demand. The County agreed to a load testing plan proposed by the Transportation Research and Development Bureau of the NYSDOT. The plan was based on investigating actual behavior of the structure under controlled truck loading. The bridge was instrumented and load tested using trucks of known weights and configurations positioned at specified locations on the deck, to gradually increase their load effect on the structure. The load testing results gave actual stiffness of the bridge beams and revealed the level of fixity at the bridge abutments. Prior to the load testing, the beam geometry was determined and the bridge structure was analyzed using the 1961 American Association of State Highway and Transportation Officials (AASHTO) specifications. The analysis was based on the assumption that the structure was designed to meet the specifications’ requirements regarding satisfying initial and final stresses. This analysis provided estimates for the initial and final post-tensioning forces, and the eccentricity and cross sectional area of the post-tensioning steel. Using this information, the beams’ ultimate and cracking moments, and a safe/threshold moment to be applied during the testing were determined. Utilizing the test results, the bridge load rating at the inventory and operating levels was performed using the AASHTO load factor method, for both H-20 and HS-20 trucks." @default.
- W560866929 created "2016-06-24" @default.
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- W560866929 date "2006-02-01" @default.
- W560866929 modified "2023-09-27" @default.
- W560866929 title "Load Testing for Bridge Rating: Dean's Mill Over Hannacrois Creek" @default.
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- W560866929 hasPublicationYear "2006" @default.
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