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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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dc.contributor.author Vandermeer, Drew E.
dc.date.accessioned 2019-07-06T22:50:38Z
dc.date.available 2019-07-06T22:50:38Z
dc.date.issued 2019-05
dc.identifier.uri http://hdl.handle.net/11122/10546
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2019 en_US
dc.description.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. en_US
dc.language.iso en_US en_US
dc.subject prestressed concrete bridges en_US
dc.subject creep en_US
dc.subject testing en_US
dc.subject Alaska en_US
dc.subject design en_US
dc.subject construction en_US
dc.subject mechanical properties en_US
dc.subject prestressed concrete beams en_US
dc.subject precast concrete construction en_US
dc.subject bridges en_US
dc.title Pre-stress loss due to creep in precast concrete decked bulb-tee girders under cold climate conditions en_US
dc.type Thesis en_US
dc.type.degree ms en_US
dc.identifier.department Department of Civil and Environmental Engineering en_US
dc.contributor.chair Ahn, Il-Sang
dc.contributor.committee Liu, Juanyu


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