固定式海洋平台与扩展结构上部组块连接形式地震动力研究-豆柴文库

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固定式海洋平台与扩展结构上部组块连接形式地震动力研究
Abstract：
Theconnectionbetweentheuppermoduleoffixedmarineplatformsandtheextensionstructureunderseismicexcitationwasstudied.Athree-dimensionalfiniteelementmodelwasestablishedtoinvestigatethedynamicresponseofthefixedmarineplatformunderseismicexcitation.Theresultsshowthattheconnectionbetweentheuppermoduleandtheextensionstructurehasasignificantimpactontheoverallseismicperformanceoftheplatform.Byoptimizingtheconnectiondesign,theseismicperformanceoftheplatformcanbeimprovedeffectively.
Introduction：
Marineplatformsarewidelyusedinoffshoreoilandgasexplorationandproduction.Inthedesignofmarineplatforms,itisimportanttoconsidertheseismicperformanceofthestructures.Theconnectionbetweentheuppermoduleoffixedmarineplatformsandtheextensionstructureisanimportantpartoftheoverallseismicperformanceoftheplatform.Inthispaper,thedynamicresponseofthefixedmarineplatformunderseismicexcitationisanalyzedbasedonathree-dimensionalfiniteelementmodel.Theinfluenceoftheconnectionbetweentheuppermoduleandtheextensionstructureontheoverallseismicperformanceoftheplatformisalsostudied.
1.FiniteElementModel
Athree-dimensionalfiniteelementmodelwasestablishedtoanalyzethedynamicresponseofthefixedmarineplatformunderseismicexcitation.Themodelincludestheuppermodule,theextensionstructure,andthefoundation.Theuppermoduleandtheextensionstructureareconnectedbyboltsandwelding.Thefoundationismodeledasarigidboundary.ThegeometryandmaterialpropertiesofthestructureareshowninFigure1.
Theuppermoduleisasteelstructurewithdimensionsof40m×40m×10m.Theextensionstructureisasteeltrussstructurewithalengthof50mandadepthof8m.Theconnectionbetweentheuppermoduleandtheextensionstructureisimplementedbyboltsandwelding.Thefoundationismodeledasarigidboundarywithdimensionsof80m×80m×20m.
2.SeismicExcitation
Theseismicexcitationissimulatedbyascaledearthquakeaccelerationtimehistory.Theaccelerationtimehistoryisscaledto0.2gbasedonthedesignseismiccoefficient.Thedurationoftheseismicexcitationis30seconds.Theaccelerationtimehisto