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    Bridge Prestress Losses in Dry Climate

    Source: Journal of Bridge Engineering:;1998:;Volume ( 003 ):;issue: 003
    Author:
    M. Saiidi
    ,
    E. Hutchens
    ,
    D. Gardella
    DOI: 10.1061/(ASCE)1084-0702(1998)3:3(111)
    Publisher: American Society of Civil Engineers
    Abstract: A posttensioned, simply supported, box-girder bridge in southern Nevada was instrumented during construction beginning in June 1992. The study was triggered by concerns over the potential adverse effects of low relative humidity on prestress losses. The variation of prestress forces and deflection was monitored over a 24-month period. These measured data were compared with four loss prediction models: (1) American Association of State Highway Transportation Officials (AASHTO) specifications; (2) American Concrete Institute (ACI) Committee 209; (3) Prestressed Concrete Institute (PCI) Committee report; and (4) Naaman's time-step method. The measured data showed that the actual creep and shrinkage losses were less than those predicated by AASHTO by approximately 30%. Of the three time-step methods, namely, the ACI 209, Naaman, and the PCI Committee methods, the first two yielded creep and shrinkage losses that closely matched the measured data, whereas the PCI method underestimated the losses by 15%.
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      Bridge Prestress Losses in Dry Climate

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    http://yetl.yabesh.ir/yetl1/handle/yetl/50400
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    contributor authorM. Saiidi
    contributor authorE. Hutchens
    contributor authorD. Gardella
    date accessioned2017-05-08T21:24:41Z
    date available2017-05-08T21:24:41Z
    date copyrightAugust 1998
    date issued1998
    identifier other%28asce%291084-0702%281998%293%3A3%28111%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/50400
    description abstractA posttensioned, simply supported, box-girder bridge in southern Nevada was instrumented during construction beginning in June 1992. The study was triggered by concerns over the potential adverse effects of low relative humidity on prestress losses. The variation of prestress forces and deflection was monitored over a 24-month period. These measured data were compared with four loss prediction models: (1) American Association of State Highway Transportation Officials (AASHTO) specifications; (2) American Concrete Institute (ACI) Committee 209; (3) Prestressed Concrete Institute (PCI) Committee report; and (4) Naaman's time-step method. The measured data showed that the actual creep and shrinkage losses were less than those predicated by AASHTO by approximately 30%. Of the three time-step methods, namely, the ACI 209, Naaman, and the PCI Committee methods, the first two yielded creep and shrinkage losses that closely matched the measured data, whereas the PCI method underestimated the losses by 15%.
    publisherAmerican Society of Civil Engineers
    titleBridge Prestress Losses in Dry Climate
    typeJournal Paper
    journal volume3
    journal issue3
    journal titleJournal of Bridge Engineering
    identifier doi10.1061/(ASCE)1084-0702(1998)3:3(111)
    treeJournal of Bridge Engineering:;1998:;Volume ( 003 ):;issue: 003
    contenttypeFulltext
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