简介:Thestiffenedcylindricalshelliscommonlyusedforthepressurehullofsubmersiblesandthelegsofoffshoreplatforms.Therearevariousfailuremodesbecauseofuncertaintywiththestructuralsizeandmaterialproperties,uncertaintyofthecalculationmodelandmachiningerrors.Correlationsamongfailuremodesmustbeconsideredwiththestructuralreliabilityofstiffenedcylindricalshells.However,thetraditionalmethodcannotconsiderthecorrelationseffectively.Theaimofthisstudyistopresentamethodofreliabilityanalysisforstiffenedcylindricalshellswhichconsidersthecorrelationsamongfailuremodes.Firstly,thejointfailureprobabilitycalculationformulaoftworelatedfailuremodesisderivedthroughuseofthe2Djointprobabilitydensityfunction.Secondly,thefullprobabilityformulaofthetandemstructuralsystemisgivenwithconsiderationtothecorrelationsamongfailuremodes.Atlast,theaccuracyofthesystemreliabilitycalculationisverifiedthroughuseoftheMonteCarlosimulation.Resultoftheanalysisshowsthefailureprobabilityofstiffenedcylindricalshellscanbegainedthroughaddingthefailureprobabilityofeachmode.