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    Excessive Long-Time Deflections of Prestressed Box Girders. II: Numerical Analysis and Lessons Learned

    Source: Journal of Structural Engineering:;2012:;Volume ( 138 ):;issue: 006
    Author:
    Zdene ˘k P. Bažant
    ,
    Qiang Yu
    ,
    Guang-Hua Li
    DOI: 10.1061/(ASCE)ST.1943-541X.0000375
    Publisher: American Society of Civil Engineers
    Abstract: As a sequel to Part I, which clarified the causes of the unexpectedly large deflections of the Koror-Babeldaob Bridge in the Pacific island nation of Palau, Part II presents the numerical procedure and reviews the lessons learned. The box girder represents a thick shell that is discretized by eight-node, three-dimensional (3D) finite elements. Except for corrections due to cracking, concrete creep is assumed to follow aging linear viscoelasticity and is modeled by a rate-type law based on the Kelvin chain, the properties of which are adjusted for humidity conditions and temperature. In each time step and at each integration point, Widder’s formula is used to convert the aging compliance function to a continuous retardation spectrum for the current age of concrete, and discretization of the spectrum yields the current elastic moduli of the Kelvin units. The shrinkage strains depend on the environmental humidity and the thickness of each plate in the cross section. The computations proceed according to Bažant’s exponential algorithm, which is unconditionally stable and reduces the problem to a sequence of elasticity problems with an orthotropic effective stiffness of material and nonisotropic inelastic strains, different for each integration point in each time step. These problems are solved by commercial software ABAQUS. The segmental construction sequence is also modeled. The computer results reported in Part I explain the excessive deflections and compare the performance of various material models for creep and shrinkage. Part II formulates the lessons learned and makes recommendations for implementation.
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      Excessive Long-Time Deflections of Prestressed Box Girders. II: Numerical Analysis and Lessons Learned

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    contributor authorZdene ˘k P. Bažant
    contributor authorQiang Yu
    contributor authorGuang-Hua Li
    date accessioned2017-05-08T21:59:27Z
    date available2017-05-08T21:59:27Z
    date copyrightJune 2012
    date issued2012
    identifier other%28asce%29st%2E1943-541x%2E0000416.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/68278
    description abstractAs a sequel to Part I, which clarified the causes of the unexpectedly large deflections of the Koror-Babeldaob Bridge in the Pacific island nation of Palau, Part II presents the numerical procedure and reviews the lessons learned. The box girder represents a thick shell that is discretized by eight-node, three-dimensional (3D) finite elements. Except for corrections due to cracking, concrete creep is assumed to follow aging linear viscoelasticity and is modeled by a rate-type law based on the Kelvin chain, the properties of which are adjusted for humidity conditions and temperature. In each time step and at each integration point, Widder’s formula is used to convert the aging compliance function to a continuous retardation spectrum for the current age of concrete, and discretization of the spectrum yields the current elastic moduli of the Kelvin units. The shrinkage strains depend on the environmental humidity and the thickness of each plate in the cross section. The computations proceed according to Bažant’s exponential algorithm, which is unconditionally stable and reduces the problem to a sequence of elasticity problems with an orthotropic effective stiffness of material and nonisotropic inelastic strains, different for each integration point in each time step. These problems are solved by commercial software ABAQUS. The segmental construction sequence is also modeled. The computer results reported in Part I explain the excessive deflections and compare the performance of various material models for creep and shrinkage. Part II formulates the lessons learned and makes recommendations for implementation.
    publisherAmerican Society of Civil Engineers
    titleExcessive Long-Time Deflections of Prestressed Box Girders. II: Numerical Analysis and Lessons Learned
    typeJournal Paper
    journal volume138
    journal issue6
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0000375
    treeJournal of Structural Engineering:;2012:;Volume ( 138 ):;issue: 006
    contenttypeFulltext
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