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    Investigation on the Impact of Seasonally Frozen Soil on Seismic Response of Bridge Columns

    Source: Journal of Bridge Engineering:;2010:;Volume ( 015 ):;issue: 005
    Author:
    Liam M. Wotherspoon
    ,
    Sri Sritharan
    ,
    Michael J. Pender
    ,
    Athol J. Carr
    DOI: 10.1061/(ASCE)BE.1943-5592.0000075
    Publisher: American Society of Civil Engineers
    Abstract: This paper presents the development of numerical models that investigated the seismic response of a simple two span prototype bridge system during warm and frozen temperatures. Models from both temperature conditions were subjected to a range of seismic intensities to examine the effect of seasonal freezing on the response of the system. Stiffness characteristics were defined using cyclic models of a bridge pier that were previously developed and validated using results from an experimental program on identical full-scale column-foundation units, which were tested during the summer and winter months. Dynamic characteristics of the seismic models were defined using approaches found in the literature. Frozen conditions increased the maximum bending moment and shear force demands for all seismic intensities, with nonlinearity in the column/foundation reducing the difference between the peak responses at higher intensities. At the depth of maximum foundation shear for the frozen model, demand was three times higher than the unfrozen for the 500-year return period and twice during the 2,500-year event. This is significant as one will assume shear is not critical at this location if the effects of frozen conditions are ignored. Apart from the smallest intensity event, increased peak lateral displacements were developed by the warm model down the length of the column and foundation. However, the displacement demand to capacity ratio was higher at the column top for the frozen model, exceeding the capacity during the 2,500-year return period event.
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      Investigation on the Impact of Seasonally Frozen Soil on Seismic Response of Bridge Columns

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    http://yetl.yabesh.ir/yetl1/handle/yetl/56601
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    contributor authorLiam M. Wotherspoon
    contributor authorSri Sritharan
    contributor authorMichael J. Pender
    contributor authorAthol J. Carr
    date accessioned2017-05-08T21:34:49Z
    date available2017-05-08T21:34:49Z
    date copyrightSeptember 2010
    date issued2010
    identifier other%28asce%29be%2E1943-5592%2E0000077.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/56601
    description abstractThis paper presents the development of numerical models that investigated the seismic response of a simple two span prototype bridge system during warm and frozen temperatures. Models from both temperature conditions were subjected to a range of seismic intensities to examine the effect of seasonal freezing on the response of the system. Stiffness characteristics were defined using cyclic models of a bridge pier that were previously developed and validated using results from an experimental program on identical full-scale column-foundation units, which were tested during the summer and winter months. Dynamic characteristics of the seismic models were defined using approaches found in the literature. Frozen conditions increased the maximum bending moment and shear force demands for all seismic intensities, with nonlinearity in the column/foundation reducing the difference between the peak responses at higher intensities. At the depth of maximum foundation shear for the frozen model, demand was three times higher than the unfrozen for the 500-year return period and twice during the 2,500-year event. This is significant as one will assume shear is not critical at this location if the effects of frozen conditions are ignored. Apart from the smallest intensity event, increased peak lateral displacements were developed by the warm model down the length of the column and foundation. However, the displacement demand to capacity ratio was higher at the column top for the frozen model, exceeding the capacity during the 2,500-year return period event.
    publisherAmerican Society of Civil Engineers
    titleInvestigation on the Impact of Seasonally Frozen Soil on Seismic Response of Bridge Columns
    typeJournal Paper
    journal volume15
    journal issue5
    journal titleJournal of Bridge Engineering
    identifier doi10.1061/(ASCE)BE.1943-5592.0000075
    treeJournal of Bridge Engineering:;2010:;Volume ( 015 ):;issue: 005
    contenttypeFulltext
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