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    Numerical Modeling Approach for Steel Catenary Riser Behavior at Touchdown Zone

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2021:;Volume ( 147 ):;issue: 006::page 04021033-1
    Author:
    Liang Zhao
    ,
    Zefeng Zhou
    ,
    Dong Wang
    ,
    Lifen Chen
    DOI: 10.1061/(ASCE)GT.1943-5606.0002510
    Publisher: ASCE
    Abstract: This paper introduces a new numerical approach in the analysis of the dynamic interaction between the steel catenary riser (SCR) and seabed in the vicinity of the touchdown zone (TDZ). The interaction between the SCR and seabed is modeled by a series of springs distributed along the SCR length. The pipe-soil interaction (the single spring) is simulated by an elastoplastic model in which the penetration resistance is estimated according to the relation to the yield force on the backbone curve. The backbone curve is calculated according to the current soil undrained shear strength (su,av) at the pipe depth. The su,av is evaluated by a recently developed effective stress framework in which the effect of soil remolding during pipe dynamic motion can be well captured by formulating within the framework of critical-state soil mechanics. An example of the whole SCR under cyclic displacements induced by the vessel motion for different wave conditions is analyzed using the proposed numerical approach, and the SCR responses in the TDZ, including the embedment, contact forces, penetration stiffness, and structural responses, are discussed.
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      Numerical Modeling Approach for Steel Catenary Riser Behavior at Touchdown Zone

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4271498
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    • Journal of Geotechnical and Geoenvironmental Engineering

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    contributor authorLiang Zhao
    contributor authorZefeng Zhou
    contributor authorDong Wang
    contributor authorLifen Chen
    date accessioned2022-02-01T00:28:59Z
    date available2022-02-01T00:28:59Z
    date issued6/1/2021
    identifier other%28ASCE%29GT.1943-5606.0002510.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4271498
    description abstractThis paper introduces a new numerical approach in the analysis of the dynamic interaction between the steel catenary riser (SCR) and seabed in the vicinity of the touchdown zone (TDZ). The interaction between the SCR and seabed is modeled by a series of springs distributed along the SCR length. The pipe-soil interaction (the single spring) is simulated by an elastoplastic model in which the penetration resistance is estimated according to the relation to the yield force on the backbone curve. The backbone curve is calculated according to the current soil undrained shear strength (su,av) at the pipe depth. The su,av is evaluated by a recently developed effective stress framework in which the effect of soil remolding during pipe dynamic motion can be well captured by formulating within the framework of critical-state soil mechanics. An example of the whole SCR under cyclic displacements induced by the vessel motion for different wave conditions is analyzed using the proposed numerical approach, and the SCR responses in the TDZ, including the embedment, contact forces, penetration stiffness, and structural responses, are discussed.
    publisherASCE
    titleNumerical Modeling Approach for Steel Catenary Riser Behavior at Touchdown Zone
    typeJournal Paper
    journal volume147
    journal issue6
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0002510
    journal fristpage04021033-1
    journal lastpage04021033-12
    page12
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2021:;Volume ( 147 ):;issue: 006
    contenttypeFulltext
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