Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings-中国Betway体育网页登陆

摘要 Thedynamicequationsofmotionofasymmetricoffshoreplatformsunderthreedifferentenvironmentalconditions:seismicaction,waveactionandtheircombinationareestablishedinthispaper.Inestablishingthesemotionequations,threetypicaleccentricitytypesincludingmasseccentricity,rigidityeccentricityandtheircombinationwereconsidered,asareeccentricitiesthatoccurun-idirectionallyandbi-directionally.Theeffectsoftheeccentricitytype,thedynamiccharacteristicsandtheenvironmentalconditionsonthetorsionalcouplingresponseofplatformsareinvestigatedandcompared.Anefforthasalsobeenmadetoanalyzetheinffluenceofaccidentaleccentricityonasymmetricplatformswithdifferenteccentricityintwohorizontallyorthogonaldirections.Theresultsaregivenintermsofnon-dimensionalparameters,accountingfortheuncoupledtorsionaltolateralfrequencyratio.Numericalresultsrevealthattheeccentricitytypehasagreatinffluenceonthetorsionallycoupledresponseunderdifferentenvironmentalconditions.Therefore,itisnecessarytoconsiderthecombinationofearthquakeandwaveactionintheseismicresponseanalysisofsomeoffshoreplatforms.

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Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings

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