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    Seismic Behavior of Pile-Group-Supported Bridges in Liquefiable Soils with Crusts Subjected to Potential Scour: Insights from Shake-Table Tests

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2020:;Volume ( 146 ):;issue: 005
    Author:
    Xiaowei Wang
    ,
    Bohai Ji
    ,
    Aijun Ye
    DOI: 10.1061/(ASCE)GT.1943-5606.0002250
    Publisher: ASCE
    Abstract: One-g shake-table tests were conducted to characterize seismic demands and reveal failure mechanisms of pile-supported bridges in liquefiable soils with crusts subjected to different scour scenarios, namely no scour, partial scour, and complete scour of the crusts. To this end, reinforced concrete bridge models, each consisting of a single pier supported by a 2×2 pile group, were constructed and embedded into liquefiable soil profiles with a full crust or with a partial crust or without crusts to represent the studied three scour scenarios. Physical observations and characteristic soil and structural responses are interpreted first, followed by the primary focus on seismic failure mechanisms and kinematic and inertial effects on pile responses. Test results indicate that scour tends to strongly affect failure mechanisms of the studied bridges via shifting damage positions from pier bottoms to pile heads and from piles at crust-sand interfaces to pile heads. This tendency is against the current capacity design principle that piers should fail before pile foundations. Special attention should be paid to future seismic design of bridges undergoing scour and liquefaction. Furthermore, the kinematic effect is found more prominent before scour, whereas the inertial effect itself becomes more influential after scour.
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      Seismic Behavior of Pile-Group-Supported Bridges in Liquefiable Soils with Crusts Subjected to Potential Scour: Insights from Shake-Table Tests

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    contributor authorXiaowei Wang
    contributor authorBohai Ji
    contributor authorAijun Ye
    date accessioned2022-01-30T19:41:26Z
    date available2022-01-30T19:41:26Z
    date issued2020
    identifier other%28ASCE%29GT.1943-5606.0002250.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4265798
    description abstractOne-g shake-table tests were conducted to characterize seismic demands and reveal failure mechanisms of pile-supported bridges in liquefiable soils with crusts subjected to different scour scenarios, namely no scour, partial scour, and complete scour of the crusts. To this end, reinforced concrete bridge models, each consisting of a single pier supported by a 2×2 pile group, were constructed and embedded into liquefiable soil profiles with a full crust or with a partial crust or without crusts to represent the studied three scour scenarios. Physical observations and characteristic soil and structural responses are interpreted first, followed by the primary focus on seismic failure mechanisms and kinematic and inertial effects on pile responses. Test results indicate that scour tends to strongly affect failure mechanisms of the studied bridges via shifting damage positions from pier bottoms to pile heads and from piles at crust-sand interfaces to pile heads. This tendency is against the current capacity design principle that piers should fail before pile foundations. Special attention should be paid to future seismic design of bridges undergoing scour and liquefaction. Furthermore, the kinematic effect is found more prominent before scour, whereas the inertial effect itself becomes more influential after scour.
    publisherASCE
    titleSeismic Behavior of Pile-Group-Supported Bridges in Liquefiable Soils with Crusts Subjected to Potential Scour: Insights from Shake-Table Tests
    typeJournal Paper
    journal volume146
    journal issue5
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0002250
    page04020030
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2020:;Volume ( 146 ):;issue: 005
    contenttypeFulltext
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