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    Pre-stress loss due to creep in precast concrete decked bulb-tee girders under cold climate conditions

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    Vandermeer_D_2019.pdf
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    Author
    Vandermeer, Drew E.
    Chair
    Ahn, Il-Sang
    Committee
    Liu, Juanyu
    Keyword
    prestressed concrete bridges
    creep
    testing
    Alaska
    design
    construction
    mechanical properties
    prestressed concrete beams
    precast concrete construction
    bridges
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/10546
    Abstract
    This report presents guidelines for estimating pre-stress loss in high-strength precast pretensioned concrete Decked Bulb-Tee (DBT) bridge girders in cold climate regions. The guidelines incorporate procedures yielding more accurate predictions of shrinkage and concrete creep than current 2017 American Association of State Highway and Transportation Officials (AASHTO) specifications. The results of this report will be of particular interest to researchers and cold climate bridge design engineers in improved predictions of design life and durability. The use of high-strength concrete in pre-tensioned bridge girders has increased in popularity among many state highway agencies. This fact is due to its many beneficial economic and constructability aspects. The overall cost of longer girders with increased girder spacing in a bridge that is precast with high strength concrete can be significantly reduced through the proper estimating factors. Recent research indicates that the current provisions used for calculating prestress losses in cold regions for high-strength concrete bridge girders may not provide reliable estimates. Therefore, additional research is needed to evaluate the applicability of the current provisions for estimating pre-stress losses in high-strength concrete DBT girders. Accurate estimations of pre-stress losses in design of pre-tensioned concrete girders are affected by factors such as mix design, curing, concrete strength, and service exposure conditions. The development of improved guidelines for better estimating these losses assists bridge design engineers for such girders and provide a sense of security in terms of safety and longevity. The research includes field measurements of an environmentally exposed apparatus set up to measure shrinkage, creep and strain in cylinders loaded under constant pressure for a full calendar year.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2019
    Date
    2019-05
    Type
    Thesis
    Collections
    Engineering

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