A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Yukon River Bridge, Deck Strains and Surfacing Alternatives
A 2900-ft long bridge with six spans was built over the Yukon River in the state of Alaska in the 1970's. The bridge has a 30-ft roadway that carries vehicles, supports the pipeline, is on a 6% grade and is subjected to -50 degree winter temperatures. These conditions make selecting wearing surfaces a difficult decision. The bridge superstructure has an orthotropic steel deck that is overlaid with a temporary timber wearing surface. The timber deck consists of two layers of 3 by 12 boards and is supported by two 61-inch wide by 163-inch deep box girders. This study focused on predicting strain levels of possible alternative wearing surfaces. This report presents charts for selecting the thickness of a wearing surface. The charts show strain vs modulus and thickness. These charts were developed to give engineers and suppliers a method for selecting alternate surfaces. Similar charts were developed to determine thermal strains and stresses in the wearing surfaces. The study showed that tensile strains and the range of strain for a given wearing surface were low, thermal stresses were high. Cold temperature thermal cracking, abrasion, adhesion to the steel deck, and traction are important parameters for selecting a future wearing surface. Liveload fatigue in the wearing surface should not be problem for this structure.
Yukon River Bridge, Deck Strains and Surfacing Alternatives
A 2900-ft long bridge with six spans was built over the Yukon River in the state of Alaska in the 1970's. The bridge has a 30-ft roadway that carries vehicles, supports the pipeline, is on a 6% grade and is subjected to -50 degree winter temperatures. These conditions make selecting wearing surfaces a difficult decision. The bridge superstructure has an orthotropic steel deck that is overlaid with a temporary timber wearing surface. The timber deck consists of two layers of 3 by 12 boards and is supported by two 61-inch wide by 163-inch deep box girders. This study focused on predicting strain levels of possible alternative wearing surfaces. This report presents charts for selecting the thickness of a wearing surface. The charts show strain vs modulus and thickness. These charts were developed to give engineers and suppliers a method for selecting alternate surfaces. Similar charts were developed to determine thermal strains and stresses in the wearing surfaces. The study showed that tensile strains and the range of strain for a given wearing surface were low, thermal stresses were high. Cold temperature thermal cracking, abrasion, adhesion to the steel deck, and traction are important parameters for selecting a future wearing surface. Liveload fatigue in the wearing surface should not be problem for this structure.
Yukon River Bridge, Deck Strains and Surfacing Alternatives
J. L. Hulsey (author) / L. Yang (author) / K. Curtis (author) / L. Raad (author)
1995
135 pages
Report
No indication
English
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